This is a show and tell thread, show off what you've made recently.
I made an Arduino temperature and humidity logger, left it outside for a couple of days and graphed results using excel
1x LM7805, "Arduino regulator wasn't supplying enough current."
2x 18650 cells scavenged from old laptop battery
1x Arduino nano
1x Micro SD card reader
1x 32Gb micro SD (overkill but it's what i have)
1x DS3231 RTC
costs less than 9$
>>1009508
>pics related, Excel file.
>>1009509
>literal screenshot
Why so coarse time resolution? Even Arduino's EEPROM could hold that much data.
forgot to add DHT11
>>1009511
-sent from phone.
Resolution is actually 1 minute, but temperature didn't seem to change.
water electrolysis aparathus
takes 2h to blow a baloon up with hydrogen/oxygen mix
what is the accuracy on that ?
>>1009547
1 degree C, it's what started on the dht11 datasheet.
>>1009650
What is this
>>1009508
I turned my working 3d printer into a broken 3d printer.
this counts, right?
my 555 timer delay off for RPI2 check pic for details
>>1009729
what do you need a 555 for?
a zener, cap and mosfet would have done the job...
nonetheless, not bad.
>>1009739
that wouldn't be any fun :P
plus its basically my first real circuit I've made.
So had to teach my self all this stuff in few days
>>1009742
Yeah I was thinking that might have been the case. Good job for that!
>>1009686
got a huge reel of the stuff for free so just cut to the short lengths and use it that way. and thats a right angle headphone adapter made from a jack off a dead cd drive and a plug pulled of a dead earbud. yanked the plug out of the plastic covering and soldered the jack directly to the plug.
>>1009748
Neat.
I might replicate this idea for F<->F connectors.
Gotta get a good source on a good part first tough, RS is killing me with their bullshit pricing.
>>1009509
I suppose you do have 1 minute sampling interval, otherwise the lines would be tilted not horizontal. Don't you think horizontal sections broken by discontinuous jumps is a little bit fucked up?
>>1009751
find someone thats throwing out a vcr. they usually have 2 connectors on them
>>1009752
I think there's a problem with the code as the data is stored as int not as float
>>1009748
literally did the exact same thing with rca jacks to headphone
Amateur mechatronics engineer here.
Today I has released a video on Youtube.
>> Youtube URL : https://www.youtube.com/watch?v=5M5ao1D4jWo
450kV Audio modulated Tesla Coil & Arduino controlled robot orchestra cover version of song named "Hello" by OMFG.
It took about 2 month to make the whole project.
I think this is probably the right place to introduce my project.
I hope you like it, /DIY/ Anons.
++And cheer up for your enthusiastic DIY day!!
>1x LM7805, "Arduino regulator wasn't supplying enough current."
>2x 18650 cells scavenged from old laptop battery
>1x Arduino nano
>1x Micro SD card reader
>1x 32Gb micro SD (overkill but it's what i have)
>1x DS3231 RTC
>costs less than 9$
How. How does that cost less than $9
>>1010414
Really cool setup. Where did you get those seven segment nixies? The only ones I have are the VFD type.
>>1010505
It's called "numitron"
unlike nixie tubes, numitron are fairly cheap, and use lower voltage(about ~5V)
you could easily control it via arduino or some other micro controllers.
I bought some tubes on ebay for my numitron watch project.
I think you could get it easily on there to.
>>1010429
Those are very obviously the cheap things that you can get for china for like $2-3/board assembly, not like he's paying for a real nano
>>1010523
Super cool man. Thanks for the info! Also, I think Nixies are fairly cheap, but I guess I'll have to look at the price difference.
>>1010544
a 32gb micro SD costs like $10 by itself.
Shishkebabed a 50" cracked Samsung plasma TV and found a treasure trove of components inside.
Made my first ever adjustable power supply using one of four LM2576T-ADJ step down switching regulators, with the schematic from the typical application circuit in the datasheet.
Now I am going to read about adding current limiting to this, and perhaps add all four of them inside a nice case.
Too bad my microcontroller expertise is limited to flashing leds and writing "hello world" to the serial monitor.
The inductor wails like a tiny tiny mechanical fire alarm though. Mighty annoying.
>>1012107
put that on a pcb before you make little fireworks
made this clock.
I had old numitron display i built many years ago and never used.
I added a 'backpack' with a standalone atmega8 and a ds3231 RTC module.
prototyped on arduino, whent with atmega8 programmed through ISP, meaning no bootloader and zero boot time.
displays time the instant power is applied.
ISP programming also enabled me to use the internal oscillator.
the three buttons set time.
>>1013332
>>1013333
>>1013334
>>1013333
woohoo, quads
>>1013335
prototype stage.
now that i have the code more or less down,
I'll hopefulle get around to making clocks out of some of the other retro displays i got laying about.
I made a keyboard
It's not even fully functional yet, I had a teensy wired up, but I removed it because my cable management at the time was a terrible mess. Now I'm waiting until august when I'll have time to finish the wiring.
>>1013368
here's what I was talking about
>>1013369
Improved a bit in the meantime, though I think I'll be learning to design PCBs rather than going through the hassle of handwiring again
>>1013367
You tell me.
the glow is nice and incandecant, but its not quite the same asthetic.
got a nixieclock i need to get around to fixing. Its tubes are bigger an looks a bit nicer.
i like both.
the advantage of 7 segments is that you can display most alphanumercs.
i kinda want to add a button for 'hexmode'=D
>>1013368
>>1013369
>>1013370
Oh, I've seen you on >>>/g/mkg/.
I hope my first keyboard won't look like second pic, but I know it will.
>>1013397
It may not look amazing the first time around, but that atrocity around the controller is the product of a lack of sleep and five coffees. Just don't hook up the controller when you're impatient and not capable of planning properly and/or out of it and you should be quite fine.
>>1013408
On the first time I'll probably do a 4x6 keypad, so it shouldn't be too bad while giving me some experience.
Couple of questions:
1) Why Teensy? Is there a reason why I should consider it instead of Arduino Pro Micro?
2) That backplate on the second pic, did you make it yourself? I'm searching for a cheap way to make a backplate and quite stumped at the moment.
>>1013410
1. The teensy just seems to be the go-to for this kind of stuff. I know absolutely jack shit about microcontrollers and coding (will change once I enroll in EE this August), and it was readily available and quite cheap.
2. See my post here >>>/g/55241231
There's not really much you can do when it comes to making a plate. You can design it with this tool here (http://builder.swillkb.com/), but I couldn't imagine how you'd go about cutting the switch holes out without it being a massive pain, the easiest option would be getting it lasercut.
Ok, I can think of one thing: Draw on a piece of wood (you could probably also try this with acrylic, dunno how well it'd work though) where the square holes for the switches would be. Then cut holes in the corner with a drill, and then use a chisel to slam through the wood, between the holes. Do this on all four sides and you should have a hole. Obviously you'd need a fairly thin piece of wood, and it'd probably not work so well depending on the type of wood, but that's the best I can think of if you want to do it as cheap and DIY as possible.
On that note, I'll probably try that method myself sometime, I've been wanting to make some numpads myself and I wanted to try out wood or acrylic as backplate material. Keep an eye on the /mkg/ sometime from August onwards.
>>1013412
Thanks for all the help! And good luck on your keyboard adventures.
>>1013413
Cheers, keep us posted anon. It's always nice to see the ideas and work of others.
A high efficient DC/DC power supply.
It converts 20-80v in to a voltage either larger og smaller than the input voltage.
It operates at 10 MHz.
Front door has been trashed by the sun and remodelling in a couple months so it's not worth buying a new one... but it's too trashed to live with.
Have almost but not quite the whole sheet delaminated. So I end up using a planer on the top, and I use an electric one because my manual one is in too shit shape and I just can't into sharpening.
>>1013573
Was originally hoping I could just sand it down and glue it a bit or something maybe.
>>1013574
And that's pretty much exactly what I expected to happen with the electric planer.
Just spent the rest of the day sanding the shit out of it at this point and got two coats of paint on it, which I won't bother to post.
>>1013578
You put in a ton of effort to try and fix a piece of shit lol
>>1013591
Everything came off really easy except the top foot or so.
If I could into planing it would have been a lot easier. The worst thing was sanding out the shit from the electric planer.
>>1009729
>patients
it's patience. You're not a doctor to have patients.
I made this coffeetable,
another pic coming up
>>1014106
nevermind file too large
>>1013793
language evolves, nerd
>>1014109
lold
bumpon
>>1009542
Increase current and surface area
>>1009739
how?
Did this to sell, couldn't get rid of it afterwards.
>>1015724
My big (I have 7) atx bench power supply with single output 3.3v 5v 12v -12v and -5v rails with up to 32a current handling.
The two plugs above them are a separate, buck converter controlled variable voltage supply (limited to 3a because of converter) and outputs 1-22v. Its the one I use for most applications and quick testing. The plugs are made to fit banana jacks and multimeter leads, also can be unscrewed for ring terminals. I'll post a couple build pics this took over 20 hours modifying an acrylic pc case, creating an efficient aairflow, and then over 200 soldered and wrapped connections, and a ton of lighting.
>>1015726
I regret painting it, the guts are beautiful. It has a standby LED light, a power on light, and has main power switch on back.
>>1015727
A year old and still powering literally anything for any reason haha.
>>1015730
My portable and versatile alternatives.
>>1015732
Made for a friend, I'm obsessed.
>>1015733
My pocket 1v-36v 3.5a workhorse
Night light and very quiet effective cooling fan made from slightly over volted high cfm case fans. (I like my stuff blue I'm sure you see)
>>1015736
KeePing with my fan and power supply colors, I did my entire interior in my Silverado.
>>1015740
(No clue why some are rotated) so I built a fucking impressive salvage/collection gaming rig with the guts of my hoarded computer towers. Why wouldn't I put blue at this point?
>>1015743
Living room late night set up, two monitors and my 3500lumen projector. My cable management is lazy. SO BRIGHT. MUCH BLUE. (This is the new phase of my self taught electronic tinkering)
Haven't made a psu in a while, I had my fun, and they all still get used.
>>1015744
Okay guys enjoy my dump, i have an instructable guide on that n64. My profile is Chronic.Electronics.
Funny thing is, I'm a carpenter by trade. I co run a deck and fence company. I've only gotten into electronics in the past two years. Every man should DIY somehow or another. I've never gotten to show anyone, and have countless more.
>>1009508
If a digital sensor datasheet says the sensor is accurate to 0.5c is this mean arduino won't make the accuracy suffer? Just asking because the analogue sensors can be stuffed up if the voltage reference is jumping all over the place. I don't need to set any calibration to get this 0.5c accuracy either right?
Workbench I built that's currently standing in as a desk. Cost me about £20 to build and has survived two floods, hence the floor
>>1014106
neat
>>1015746
Nice fucking woodwork!
>>1015746
I'm not even a fan of decks or wood work, but that is nice.
>>1009508
4 tube single ended tube amp based on a 1964 amp sold by Radio shack.
>>1016182
>>1016183
>>1016185
this
>>1016182
Why the fuck did you go with single ended instead of push-pull?
Thank you guys for the positive vibes, I didn't know there were people who thought my Newfound hobby was interesting until I found instructsbles and still I've only posted the N64 on there so you guys are the first to see my power supplies. I'm gonna dump some of my decks and fences tonight. This one is an outdoor kitchen on a pond. I've since stained it, and added cedar skirting
Lakeside cook house/screenroom/party deck I did for some rich rednecks haha.
>>1016185
Be careful next time. Open solder joints and clutter makes that metal case a short risk from hell. Cool style though man.
Cypress weaved fence. I loved how easy this turned out to be, I had an idea I wanted to try and got this. Then saw other people had already done it. So I used cypress not pine and painted every other post.
Last one for tonight. I'm super sleepy haha
Here's a giant 14' raised platform for a fishing/hunting camp on a local river. The only problem? Every spring the water level rises 14' and boat becomes only entry. Crazy
>>1015956
Yes but its not variable without a buck converter and the current limit is extremely small.
Most ATX power supplies have negative (-12) and a negative (-5v) rail. This can be combined with positive rails for higher lower
-12v plus 12v makes a 24v rail but limits the current to the tiny ass negative vintage.
died :c
>>1016182
I wanna make one but I'm total noob in tube amps, can I use boost converters (5v- ~275vdc) to replace those bulky transformers ? I want to make a portable tube amp. also can you actually hear positive difference between this and a normal transistor amp ?
>>1016229
see this, http://boginjr.com/electronics/lv/atx-mod/
he just used a pot.
>>1016214
hmm, admirable work, keep it up !
>>1016226
your work seems very well done, wish i got into carpentry. anyways, isn't the wood going to rot early with these high water levels ?
Dunno if unfinished projects count, but this is a trigonometry calculator that I never finished but got far with. Lost interest after I finished maths in school. Inb4 clock-bomb kid
