Electronics Zero K breadboard resistor

I always try to not just "take" when it comes to learning a new thing, but this electronics caper has really been worked out already by a whole stack of really clever people.

I cant seem to come up with anything to offer the world, so I came up with this as a forlorn attempt to quench my karmic debt.

Its the zero K breadboard resistor.

Its a wire with a knot in it.

It works just like a wire, but is easier to handle.

Its all Ive got at this stage.





My karmic overdraft doesnt seem to have changed.






120 Things in 20 years says, "When thinking electronics, a zero K breadboard resistor can be simultaneously just right, and not quite enough.".

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Aquaponics Cherry tomatoes

Those crazy cherry tomato plants I have growing directly in my fish tank water are producing some really nice fruit.

This bunch looked like a likely candidate for some photos so here they are...

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Electronics New fish lever switch

I was wandering around wondering in an electronics store today, and found a new, even better switch  for my fish activated lever on my demand fish feeder.

It looks like this.

The one on the left is what Im using now, and I had to glue some tubing on it so that it looked more like the one on the right.

The one on the right already looks absurd without my having to glue anything to it at all.

I have no idea why someone would need an inch long press button switch.

Unless they were using it as a fish lever.





I mentioned to the owner that the switches could be triggered with sideways pressure.

He didnt know that.

It seems the manufacturer didnt intend it, and it is just a pleasantly useful side affect of the manufacturing process. .





120 Things in 20 years - Getting ever close to filling up my brain with new facts about electronics and absurdly long new fish lever switches for my aquaponics demand feeder.

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Electronics Aquaponics Demand feeder lever

Probably the most difficult single thing to deal with in making my demand feeder has been working out the lever.

But as usual I called upon chance to solve it for me.

Thanks chance.

For some reason I remembered playing with a switch I bought when I was making the first version of this demand feeder. The switch was one that is a button, and turns on then off again after you lift your finger.

Its sideways click seemed nice to the touch.

The one pictured (centre front) is the same, but is on an old circuit board. I cant find my original version.



Its quite long for a momentary switch.


The interesting thing about these particular, particularly long momentary switches, is they they do their switching thing if you tilt the button to the side rather than just press it. I just tested this one and it works.

They also work if you press it, but its the sideways switchyness that interests me. It should be perfect as the lever the fish hit, because they can hit it from any direction and it should trigger.




Now all I need to do is figure out which brand they are, and if they all work like that. It might be the case that only some of them do this. It might be a manufacturing error rather than a feature.

Perhaps manufacturing error is too harsh.

Perhaps manufacturing  tolerance would be better.

Either way, I might be able to use it.



120 Things in 20 years - As luck might have it, for the next few days, you might find me in electronics stores with a multimeter, trying to find a switch for my electronic, aquaponics demand feeder lever.

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Electronics Motor repair success

I fixed my broken motor that is meant to power the auger via the tiny gearbox that will deliver the fish food in my demand fish feeder.

Normally I prefer less complicated sentences.

But Im all excited.

It turns out, the problem was there were simply too many parts.

Or more accurately one too many parts, and one that was simply in the way.

The silver bit was the one too many. I think that broke off the bit where the wires connect, and fell into the motor, generally clagging things up.





The little nylon washer creates part of the front bearing, but it made getting the brushes back on impossible, because it had to be put on after the brushes. Thats an impossible path through the plastic front. I dont have the kinds of quantum tools that walking through walls requires. And if I did, I wouldnt waste my time with motor repairs. Id do much more interesting stuff, like poking my head through the fridge to see if the light really does go off when the door is closed.

So be leaving out those two small parts, I managed to make my motor work.

Only two parts.

And they were tiny.

Those that know me will realise thats a pretty low number of excess bits after a repair. I think I did quite well.

So well in fact, that it looks like this when its running.

That should do nicely.

What this all means, is that there is really no reason why I cant put this thing together today, and actually finish something.

Maybe.








120 Things in 20 years - If I keep repairing them, one day an electronic motor repair might leave me with enough parts to eventually build another motor. I should fix cars.

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Handmade fishing lures Mold making Prototyping plastic

I just discovered my new favourite substance.

Its even better than PVC.

Maybe it is PVC.

I dont know.

I was in my local electronics store checking switches, and was sold some of this stuff.

Its plastic that you can warm up and shape.

You need to get it to around 65 degrees c before it melts into itself.

Once hot, you can shape it into anything you can think of.

Pictured here is a bit I squeezed.

It retains fine detail like fingerprints, and when dry, it sets white like the beads again.

It sets to a strong plastic with a little flex, a lot like a soft drink (soda) bottle cap.




My first use was to make a very specific battery pack that didnt exist as far as I could tell.  Its great to work with, and totally recyclable. You just drop it back into hot water, and it re-melts.

I would guess you have around a minute to work with where you can press two bits together and they form one. And perhaps another minute where you can still shape it, but pressing two bits together wouldnt quite become one.

If you need more time to work it, you just put whatever youve half made back into hot water and it softens again.

Very cool stuff that I think Im going to need to buy in bulk.



120 Things in 20 years is excited about making handmade fishing lures, and just general prototyping  In reality, I have no idea what Ill do with it, but its exciting just knowing about it. Im easily excited.

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Electronics Aquaponics Demand feeder hits

It turns out the fish have been hitting the lever, but the switch hasnt been working.

It should be an easy fix, but for the time being, this will have to do.

[edit from the future - I fixed the switch and got a few proper hits with feed delivered within a few hours]

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Thinking Six degrees future communication

Those six degrees of separation are really a lot less than six when it comes to communicating with people who are, say, on the same forum as you are, live in the same street, or to people you actually know.

But even when they arent people you know, six is not so many. From now on, Im going to just rely on the few degrees of separation for all my communication needs. Booking doctors appointments, airline tickets, ordering pizza, everything.

Ive been dealing with the support desk of a net based business trying to find some information, and I think my new method might be substantially more effective than my current approach of filling out thousands of web forms.

It would certainly be more comfortable.

Because theres only a few degrees of separation between me and whoever it is a want to inform,  from now on, Ill  just chat about it casually to someone I meet in the street, and hope the query or order finds itself on the correct desk on the other side of the globe.

As a method of getting a help desk to respond, I cant see it being any worse than my recently tried methods.

I feel better already.




120 Things in 20 years - Going crazy one purchase at a time when thinking about my communication issues.

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Aquaponics Silver Perch update

I recently ran out of fish feed, so Ive been hand feeding them worms, and what ever they call fly larvae in whatever part of the world you live.  They are called "gents" here when bought as bait, or stored in a fridge shared with people who dont want maggots in their fridge. "Maggots" when found in smelly stuff.

The point is, as a result of feeding them live food like worms, gents, and caterpillars, they are venturing a bit further up the water column to the point where they are now easy to photograph.

This guy is pretty big.

And heavy looking.

It looks like this up close.

I have no idea how big or how heavy it is, but Ill try to get a photo next to a ruler.

I wont try to weigh it because I cant think of a way to do it without stressing it.

Ill weigh it if I ever eat it.



120 Things in 20 years - Sometimes your aquaponics silver perch get quite big when youre not looking.

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Electronics Inverter repair

An inverter is a useful thing. It takes a stack of electrons from a 12 volt battery, and makes them look like the stuff that comes out of your wall, in my case at 240 volts.

How it does it is anyones guess.

In my case it doesnt actually do that. In fact all it does, is take a stack of electrons from a 12 volt battery, and turn them into the smell of melting value.

I couldnt understand why a perfectly interesting looking device should fail.

Here it is pictured after it was repaired, but it also looked pretty much like that when it didnt work, but now Ive given away the ending to this tale.

I fixed something - a first.

Note the total absence of left over bits - also a first.


Normally, the plan of attack is to open the device up, then put all the left over bits in the bin next to the now slightly more hollow, and slightly lighter device.

But this time was different.

To begin with I already knew why it was making all that melting plastic smell.

It was over heating.

The thing has a fan that is presumably meant to spin around a lot. At least I hope its meant to spin around a lot. If it isnt meant to, it does now.

Perhaps I just invented something....

To make an artificial breeze, simply take a normal fan, and make it spin.

So...

The point is the fan wasnt spinning. I have a few fans that Ive pulled out of junked computers, so I figured Id just replace it. I can solder a bit now as well, so I figured it should be easy.

There were even some obvious screws to undo.

I used the electric screwdriver my mum bought me as part of a present.

Thanks mums everywhere. It even has a torch built in and you can never own enough torches, even when you will never use them.

I always thought electric screwdrivers were a bit pointless, but it turns out they are excellent. Ive just never actually needed one before.

Unlike this project, my last had a few bits left over, and this was where the electric driver was really useful. It turns out there are a zillion screws inside stuff.

Pictured is all the leftover bits not including all the gears and shafts and all kinds of springs and stuff that might come in handy one day.

"What are the chances of any of it coming in handy?", I hear you ask.



But thats what they said about the 200 short lengths of black poly irrigation pipe I still have in the shed.

This thing used to be one of those fax, copier, printer combo devices that wasnt working any more. A friend was throwing it away, and thought my car was as good a place as any to throw it. It turns out there are some good motors and gears inside. I think there were five motors in there. Thats them on the right. Maybe six motors. Im planning on needing some motors, gears, and some shafts for making my solar tracking heliostat. There are also a stack of salvaged components used for tracking the placement of motors. The motor on the bottom right has a spoked arrangement that passes between a censor that detects light, and a light. The shadows cast by the spokes allow the system to track where the print head is. Or so Ive read.

So much to learn. So much time. If you just stop watching TV.

Anyway, Ive drifted off what pretends to be this posts topic...

Ok, so the fan wasnt spinning.

None of the fans I had would fit exactly, and would have to be trimmed (hacked and snapped with a pair of pliers) until they could be coaxed into duty.

I looked under that foil label and found the exposed end of the shaft.

I thought Id drop in some oil before I replaced the fan to see if thats all it needed. It was.




The black, and off white cylinder in the front with the brown stain at the base is a capacitor.

Im guessing it was also the source of the burnt plastic smell.

So that had to go. Luckily I have stacks of different capacitors from pulling apart some stuff, and had a duplicate.

A big component with large nicely spaced pins that proved easy to solder.

The thing went back together with no left over bits, and no spilt coffee added.

I realise this was a very simple repair, but it is something I would have sent to landfill before learning a bit of electronics over these last few months.

Here is a terrible photo of it charging a phone through its transformer, and maybe a bit of Bigfoots leg. Who can tell.



A 12v car battery supplying an inverter outputting 240v, then through the iPhone transformer to bring it back down to 5v.

Ok its slightly inefficient, but the phone was the smallest thing I could take to the car to test it.

I rate this a total success.

Which is nice.




120 Things in 20 years - Bringing me one step closer each day to being able to take down a Terminator. Or repair an inverter. I need to win a 3D printer.

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Thinking Fresh produce

Is it just me or is everyone crazy?

Dont answer that, it was a rhetorical question .

I just picked a stack of cherry tomatoes from my aquaponics system. They represent only the second batch that has made it back to the house. All the others were devoured before the back door. But this time, some made it.

Looking at them in my kitchen has me wondering why we insist on having all our fresh produce being uniform in size, shape, and colour. This is a very "developed world" kind of issue, so if you are more sensible than this where you live, just ignore this post, but in this part of the world, almost everywhere we buy fresh produce only sells perfect looking produce.

I wonder what would happen to prices if they just left out one of the criteria for A grade produce.

For example, size.

The size of a fruit is by far the least relevant thing.

The tomatoes harvested were all ripe, all delicious, and all different sizes.

So why would the four on the right be classed as second grade.

Its because...







We are all crazy.




120 Things in 20 years - Where thinking and forming opinions about everyone regarding fresh produce, is often presented as fact.

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Electronics Aquaponics Demand feeder fish lever build

I spent some time in an electronics store testing long buttoned momentary switches.

They all seem to work when you tilt the button to the side as well as when you press the button normally. Perhaps they are designed to work that way after all.

Thanks button maker.

I had a bit of a breakthrough with the entire lever, and not just the switch part. I found this fishing float had a white plastic bit that almost fit over the momentary switchs button.

Thats the switch lower right.

The white plastic thing was hollow, but needed a slight enlargement with a hand held drill.

The button went in with a snug fit, and the white thing was really their just to give me some surface area glue onto.

The new lever incorporated a second fishing float as the stem, and as a nice bulb for the fish to hit.

The float stem has a bit of flex to it, so it should be forgiving if a fish hits it hard.

It looked lie this when built.

I glued it in place with super glue, and held it while it dried with what to me looks like a naked chicken with a fist for a head.

So now my device looks like this.

It also works.

I turned it on, and while I was putting a cover over the fish tank, the bigger of my two fish hit the lever and got a feed.

I did have the camera running, but the video was too dark to post, but the switch and lever worked perfectly.

I count this as a success!











120 Things in 20 years suggests you never try to take your electronic aquaponics demand feeder on a plane with you, unless you feel like explaining it for a few hours.

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Electronics Infinite battery life camera

Ive had to make a few compromises with version 2.0 of the demand feeder.

One is that Ive re-written the code and made it a lot more simple than it was originally. Ive still got the old code, and Ill use it and post it when I make it a little better, but the full version resets each day at dawn as one of the overfeeding protection measures. I only have two silver perch in a 100L fish tank, with 300L of filtration media, so they can have as much feed as they like. To encourage the pressing of the button, Ive made it so that they only get a small amount of feed each time, but they have the opportunity of more feed after only eight minutes since the last feed. The point of making a simpler version of the software was so that it would keep a running total of all events like the number of times the fish have hit the feed lever when the light is lit, and the number of times when the light isnt lit.

The fish pressed the lever only once in the 24 hours since I added it to the system. This may have just been a tail swipe, but it would have delivered feed, so some reinforcement of the behaviour of getting at least near the lever has begun!

It wont take them long to get the hang of it.

I ran the camera until the batteries were dead last night, but the hit must have happened some time since dawn while the camera was on charge. To solve this two hour filming limit, I created this.

Its a camera taped to its battery charger, that is in turn taped to a tripod.

I plugged it into the earth leakage safety switch that the rest of the system is plugged into.



It blends in a bit with the actual feeder, but thats the feeder with the birds nest of wires sticking out of the back of it. The orange looking light under the camera is the LED that tells the fish feed is currently available. The red light at the top is the power on LED, and the yellow one is flashing out the number of feeds allowed in a day (even though the thing no longer resets after a day, so really it shows the number of feeds allowed ever). There are also LEDs that flash out the number of feeds so far, the feeds remaining, the number of attempts made at the lever when food isnt available. That is when the feed LED isnt lit, because they just fed recently. And one more that flashes out the size of each feed thats delivered. The size is measured by how long the motor is on for, and doesnt actually represent the amount of feed, but on average, should spill a predictable amount each time. Currently, they would get around 5-8, 3mm pellets each time they hit the lever.

Hopefully, Ill have some video soon.



120 Things in 20 years - Electronics - Infinite battery life camera - This project is far from finished.

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Aquaponics Roots in the media

Its quite possible that this is one of those things that everyone does, but its so obvious that nobody mentions it.

Perhaps everything is one of those things, but Id rather hear something twice than never know about it, so Ill say it anyway.

For some time, Ive been harvesting things like lettuce, then spending valuable seconds of my life getting the media out of the roots and retuning it to the grow beds. Clay balls get loose a bit more readily than scoria, but roots seem determined to hang onto whatever media they find themselves in.

Dont get me wrong, this is no way an issue because it really is only a few seconds, but Id rather spend those few irreplaceable seconds doing more important things - eating strawberries, looking at fish, that sort of thing.

But I discovered that if you just snap off the roots and leave them in a bucket, the media falls out all by itself.

Bam! Earth shattering tip right there.

I add an extra step for the worms.

When I pull up a lettuce, the root ball always has a few worms in it. Even in the constant flood grow bed there are worms everywhere. And as much as Im happy to feed my worms to the fish, I like my worms and like it when they live in my growbed rather than die on the ground. So when I snap off the roots, I lay the ball of roots, and media back on the growbed until the next time I wander past. This allows the worms time to get back into the growbed as their root ball home slowly dries.

The next day (or whenever) I drop the root ball into my root ball bucket, where it dries out and leaves the media behind. After the bucket has seen a few root balls added, or when I get around to it, I return the loose media back to the grow bed, and the dried roots and stems to the compost heap. Once in the compost heap, they sit for eternity. We dont use the stuff.



120 Things in 20 years - Wasting compost from the roots caught up in my aquaponics media.

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Electronics Aquaponics Demand fish feeder software

As far as I know, the software is all working on my demand fish feeder.

Its a bit of a mess, with a few goto statements and a few unused variables. Ill fix it in time, but for now Im going to move onto getting a finished product up and running. As far as I can tell with the software simulator everything works, but the real world might be a completely different story. (the breadboard version also works)








A switch lever extends down into the water. If a light near the lever is lit, the fish can press the lever and feed is delivered. Feed can also be offered with an override button that sets the light on and the feed on if the fish hit the lever (so you can show people how it works)

Dawn detection seems to work. In the end I went with two startup options.

1. A human who holds down the FeedNow override button during startup, then taps out the approximate number of hours since dawn. This skips the code that searches for a new dawn.

2. An abnormal restart with no human. This stops all feeding (there might have been a blackout, and subsequent ammonia buildup) (note to self - add code that flashes some lights to indicate the device is in abnormal start mode so a human can reboot it if they desire). Feeding resumes after night time is detected, and a dawn is detected.

The user can select (via a screwdriver to resist little finger making their own adjustments) ...

 - the feed amount per day in tenths of a second of motor on - from 0 to 65 (Im guessing Ill use 1/2 a second per feed event) The motor turns an auger under a hopper full of feed. So there is another adjustment available

- The number of feeds in a day that are offered (0 - 255 per day)

- The level of light at which dawn is detected. This allows for a system built in the glow of a streetlight or whatever. At dawn each day, all the numbers reset. This is a bit of a problem as far as reading how many feeds were delivered in a day, but for now Ill leave it as it is. My fish feed like crazy at dawn, so I want to give them the greatest opportunity to feed. Eventually Ill add a data logger, so it wont matter when it resets.


The system reports...

- the number of hours since dawn

- the number of feeds since dawn

- The number of false hits to the feed lever when the FeedIsAvailableLED is NOT lit (these will go down to near zero once the fish learn they can only get food when the light is on)


I ran out of feed a while back, and have been feeding my two big silvers on duckweed, lettuce, and worms, so I will need some pellet food before I can test it in the real world. (I still have the PVC device from the first version).

Ill also need a motor as my original one is no longer with us.

The feeding regimen isnt very intelligent at the moment, but Ill do a bit of research, and add some code that tries to deliver the maximum amount of feed in a day that the system can handle. This will probably involve allowing 3/4 of the feed to be dumped at will, with the rest being spaced out over the day ... or something. I havent given it enough thought because I dont really know what the fish need. My experience in fishing for wild fish indicates that the feeding pattern is far from a constant grazing all day long. Ill work it out.

But...

Its going to work. In fact, it already does.


120 Things in 20 years Thats all. Just 120 Things in 20 years.

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Thinking Local knowledge

When I was in Papua New Guinea - Madang in particular (I think) Mum found some locals that were willing to let us borrow their canoe for a dollar or two per day. I was quite young at the time, and remember being scared when I could see the bottom, but completely relaxed when I couldnt.

That has baffled me for many years until I experienced a recent fishing trip near Port Pirie (South Australia). The clear waters brought on a vivid memory of the Medang canoe trips. The problem I was having was a fear of heights.The water was so clear, that I felt I was going to fall the thirty feet to the bottom.

Not such a strong sensation when witnessed as a grownup, but as a little kid, it was enough to scare.

The point of this is to introduce a story that will be wrapped up much more quickly than he introduction.

I nabbed a cowrie as a result of spending every day I could snorkelling. (sorry nature). It was a real treasure to me, and I was desperate to take it home to South Australia. It was only a few days before our departure date, and I had no idea how to get the now dead snail out of its home in time for a trip through customs.

A local kid offered a solution.

Juts let it sit next to an ants nest for a bit.

It worked a treat.

The moral...

Have a problem that needs solving?

Ask a kid.

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Thinking Deflationary exhaustion

sometimes being interested in stuff, can be exhausting and a little deflating.

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Aquaponics Over Flow

I wandered out to my system last night, and had what is commonly known as an HSM.

It must stand for Holy Ship Moment.

One of my grow beds was flooded, and there didnt seem to be any reason why.

This is the scene a few minutes after the pump was switched off.

There was water on the floor, and the pump was sucking in small air bubble through the little tornado that had formed in the shallow water over the pump inlet.

I couldnt figure out what was going on, so did a search of the system.

I found this blockage in the stand pipe.

It was stuck really well, but eventually to hammer it out with a length of dowel and a hammer.

The culprit, shown here, was a small piece of scoria.

This growbeds media is scoria.

I also found bird droppings. Im guessing a blackbird was in there throwing things around and looking for worms.

I do actually have an over flow pipe, added when I first built the little system, but the input flow from my bigger pump is much greater these days, so the little pipe wasnt up to the task.

Even so, its a good thing it was there because I think it saved the day by delaying the disaster until I discovered it.

Ill upgrade the pipe to cope with the new greater flow, and Ive put a PVC cap over the media guard so that particular issue cant happen again.





120 Things in 20 years think the last thing an aquaponics system needs is excitement when it comes to overflows.

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Electronics Heatshrink

This stuff is almost as good as PVC, and that other plastic stuff I recently discovered.

Heatshrink is way cool, because it can hide your personal lack of soldering skill.

And kids, we all know its important to hide socially awkward things like skill deficits.

Heatshrink is a thing like the thing that was on wire before you mutilated it with wire strippers, and a soldering iron.

Its a bit like make-up, and a bit like a seat belt.

Im not sure if I remember how its a bit like make up, but its a bit like a seat belt in so far as it can stop your house from burning down.

It looks something like this.

Its the black bits.

When you buy it, it looks like this.

All wrinkle free and smooth.

When you butcher a bit of soldering, you can hide it (except in profile) from the world with a small cutting of heatshrink.

Just cut off the appropriate length to cover all of your electronic inabilities, and youre one step closer to the prom.

A bit of heat sees the stuff shrink against the underlying wire!

Whod have guessed?

The final product looks like this if you are unlucky.

And unskilled.

But the reality is, its not just a cover up.

Being able to add a layer of insulation to whatever exposed wires you needed to create to make your project, makes for a totally worthwhile product.



It replaces bits of tape, and sometimes hope. And hope rarely does much to put out fires.

A truly wonderful product that I would be happy to gain profit from endorsing.

If only I knew what brand I use.


It really comes into its own when you cram your vision onto a breadboard in any of the malformed ways that have become all to familiar to readers of this blog.

At least, when you use heat shrink, you know the problem is with your design rather than with some crazy bits of wire touching each other inappropriately.

Depicted here, a staged approximation of chaos on a breadboard, rendered happy by heatshrink.







Actually depicted there are some short lengths of wire soldered to even shorter lengths of header pin (stiff wire bits) that serve to make connecting stuff on a breadboard a dream.

But perhaps best of all, if you decide to spring for the $2.33 to buy a few* metres of heat shrink, and make some breadboard wires, you also get to learn some stuff about how solder flows, and get your soldering technique under control in a way that can more perfectly disguise your delinquent soldering misadventures.

Its soldering practice, but it has a purpose, and it will serve you well.

Make some breadboard wires with heatshrink today.


* hang on, isnt 233 a prime number that doesnt really divide well into a "few"?


120 Things in 20 years has some small burns since discovering heat shrink, but less than you might expect if you follow this blog closely.




















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Electronics Breadboard multimeter adapter

For some time now Ive been looking for a convenient way to probe around my breadboard with my multimeter. It can be a little tricky, because the probes are too thick to get into the little holes on the breadboard.


I had a bit of an idea today.

I came up with this...

Its a stereo headphone jack with a long length of header pin (sturdy wire used as a plug) soldered to the legs.

I added some insulation in the form of heatshrink, and...

TaDah!

The 120 Things in 20 years multimeter breadboard adapter.

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