Arduino: Eh, just grab some pliers and bend the pins

The Something Awful Forums > Discussion > Hobbies, Crafts, & Houses > Arduino: Eh, just grab some pliers and bend the pins

shame on an IGA: Apr 8, 2005

thegasman2000 posted:

So I bought the wrong relays... I am using a NodeMcu with the blynk app and want to control a relay. The relay I bought needs 5V and the board puts our 3.3V what options have I got? (I tried as "some" work but not this one)

What's the current draw on the coils? That might be too much load to drive straight off MCU pins anyway. Best practice is to have all the relay coils on a seperate circuit and switch them with optoisolators driven off the controller.

shame on an IGA fucked around with this message at 16:22 on Jun 30, 2018

# ¿ Jun 30, 2018 16:19

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# ¿ May 14, 2024 06:49

shame on an IGA: Apr 8, 2005

Has anyone else played with the siemens logo series? They sell them as "Programmable Relays" but they're little micro PLCs with 8 inputs (8 digital, 2 do double duty as 0-10v analog), 4 relay outputs, and are programmable in FBD through the integrated display and softbuttons. I use a ton of them at work.

# ¿ Oct 19, 2018 20:54

shame on an IGA: Apr 8, 2005

Wibla posted:

They're nice, but the limitations are annoying when coming from actual PLCs.

Have you looked at S7-1200s?

Maybe in another decade, most of our serious equipment runs on -300 with an uncomfortably large amount of S5 still hanging around.

# ¿ Oct 20, 2018 21:42

shame on an IGA: Apr 8, 2005

I'd use a counter that increments -1 per trigger actuation and resets to 10 when the mag is removed, then you only need 2 sensors and cheap limit switches will probably do the job. If you want to detect the balls directly you're looking at either ultrasonic or optical and it's gonna get mad expensive and have a lot (A LOT) of complications with debouncing the signals.

shame on an IGA fucked around with this message at 22:05 on Jan 2, 2019

# ¿ Jan 2, 2019 22:01

shame on an IGA: Apr 8, 2005

What make and model BMS do you have? I'd mostly be concerned about verifying the voltage on that serial port before you risk frying a pin, any other configuration needs can be handled in software. RS-232 / 9600 baud / 8 data bits / 1 stop bit / no parity is pretty standard but you never know if you've got an oddball until you check.

# ¿ Aug 5, 2019 22:57

shame on an IGA: Apr 8, 2005

Based on this documentation filename coming up from googling the driver filename, I'm confident it's 232. Now gotta figure out which wires on the stereo plug are Tx / Rx / GND

# ¿ Aug 5, 2019 23:20

shame on an IGA: Apr 8, 2005

Wait a decade or two until the ravages of time make you unable to hear that frequency range.

# ¿ Aug 19, 2019 02:22

shame on an IGA: Apr 8, 2005

You're trying to make a watchdog timer

# ¿ Sep 24, 2019 02:39

shame on an IGA: Apr 8, 2005

If your bosses are serious about handing the new guy a project of this scale with a 2 week deadline the only helpful advice will be found in this thread.

https://forums.somethingawful.com/showthread.php?threadid=3768531&pagenumber=1&perpage=40

# ¿ Oct 26, 2019 03:04

shame on an IGA: Apr 8, 2005

Shadow0 posted:

I just figured out the answer, thank you! I can get a new barrel jack and have that sticking out instead of the Arduino's. Then I can have that one on the line with the switch. Then I just need a way to prioritize the two input sources.

DPDT relay my man

# ¿ Oct 30, 2019 05:48

shame on an IGA: Apr 8, 2005

hey I've got a bunch of retired Siemens LOGO! ver.6 controllers if anyone's interested in having one to play around with, most of them are 12/24vdc power and inputs, 4x relay outputs rated to 10A 240VAC. 8 digital inputs with 2 configurable as 0-10vdc analog in.

# ¿ Mar 4, 2020 04:07

shame on an IGA: Apr 8, 2005

Yeah ladder is awful and basically "Literally draw a picture of how you would implement this by wiring together discrete hardware relays" but fortunately we have Function Block Diagram now and it's more like drawing a diagram of how you would implement this by wiring together a bunch of discrete logic ICs.

This signal conditioner to deconflict potentially simultaneous signal pulses into a single combined counter pulse is probably the most complicated thing I've done with this hardware.

shame on an IGA fucked around with this message at 03:52 on Mar 10, 2020

# ¿ Mar 10, 2020 03:50

shame on an IGA: Apr 8, 2005

Statement List is the portal to Hell.

# ¿ Mar 11, 2020 01:36

shame on an IGA: Apr 8, 2005

Ambrose Burnside posted:

How much trouble is it to substitute the core ATmega-whatever chips for conventional breadboard-compatible microcontroller boards in permanent circuit assemblies? The full boards make sense at the prototyping stage but once the assembly is proven and you start fabrication in earnest, every project I’ve done could be like 1/3 the size without the whole Arduino/ESP package involved, and a lot cheaper to boot. It’s not like i’m using most of the controller’s capabilities for gimmick/novelty projects anyways.

I gotta say, this fella makes it look pretty simple.

https://youtu.be/Sww1mek5rHU

# ¿ Mar 26, 2020 20:40

shame on an IGA: Apr 8, 2005

Is that remote going to be set up and torn down frequently? I wouldn't count on solid-conductor cat5 to survive long in a frequent-flex application like that. Might be worth calling around to your local supply houses and asking if they've got a partial roll of stranded multiconductor they'll let go of or sell you a cut length.

# ¿ May 2, 2020 17:44

shame on an IGA: Apr 8, 2005

We use Lapp Ölflex 110 for all signal and power cables in the factory I do maintenance for, it's fantastic stuff and drat near indestructible but kinda pricey.

If anyone's interested in investing in a whole roll I'd suggest 5 conductor 18 or 20ga as the most versatile bang for your buck, a little overkill for signal applications but also leaves you room to supply modest amounts of power.

# ¿ May 2, 2020 17:58

shame on an IGA: Apr 8, 2005

Spec sheet says the maximum allowable current on that input pin is 1 microamp.

# ¿ May 2, 2020 23:14

shame on an IGA: Apr 8, 2005

The top of the line crazy overbuilt Harting modular connectors we use in industry are only rated to 500 cycles on the spec sheet even though they're basically giant D-sub connectors with 4mm pins. "conservative" doesn't begin to describe it.

# ¿ May 11, 2020 16:36

shame on an IGA: Apr 8, 2005

Do arithmetic to the entire array, like if you wanna make it redder just add 0b0100000000000000 to every pixel value, except black if you wanna get fancy with it

# ¿ Mar 14, 2021 03:24

shame on an IGA: Apr 8, 2005

Wrr posted:

Well I think I blew up that open-source PLC from digital-loggers. Good riddance. gently caress that thing. Even called the company trying to ask some basic questions about it and they said look at their website. I said I was looking and their website and the schematics and whatnot, and that I had questions about those. No joy. Also why are the digital outputs putting out +13 vdc? Maybe its too powerful for my tiny brain to comprehend. Whatever.

Bought a few relay shields and am just going to build my own setup. Going to try to take out the While()s from my loops and see if that makes the pushbutton, and overReset conditionals work.

I'm also using a reed relay now, an old w171dip-2. I know the alarm is hooked up normally through it as I keep closing the relay when my magnetized fingers get too close. But when I send +5 through the +5 input of the coil, with the other end of the coil connected to ground, I can hear it a make a tiny clinking noise but nothing happens. Trying to look more into that and find out if its not enough power or something to it

it's not enough power, are you running straight off the digital out pin? spec sheet for that relay says they draw up to 290mw and that's only a nominal rating so it's quite possible yours exceeds that. I'd suggest using optocouplers.

# ¿ Jan 19, 2022 18:00

shame on an IGA: Apr 8, 2005

whats the diameter

# ¿ Jul 8, 2022 00:06

shame on an IGA: Apr 8, 2005

yeah if you've got decent budget for this I would suggest using M12 connectors and multistrand industrial sensor cable for all your breakdown connections.

As for the mechanics, woodworking or blacksmithing threads will probably have good input if you ask there

# ¿ Jul 9, 2022 00:58

shame on an IGA: Apr 8, 2005

Enos Shenk posted:

What I'm concerned is lighting something on fire, will those limit current enough to operate safely? Assuming the worst case of the operator engaging 4 or so functions all at once.

I don't know, but you won't have to know if you slap inline fuses on all of them. (do this)

# ¿ Jul 24, 2022 03:26

shame on an IGA: Apr 8, 2005

Enos Shenk posted:

So at my Makerspace, I went rooting around a wiring cabinet under some stairs where I was told there was a cool "Ticker tape thing".

It's an industrial timer made by Stromberg Electric Co, a company that stopped existing in 1935. Mounted on a piece of slate, alongside a latching relay of the same vintage. Obviously I took it out of the cabinet and set about cleaning it up. It's a mechanical clock, driven by solenoid coils. Tinkering around with it we figured out that it wants a pulse to the coils every 60 seconds to keep time. As it advances, the plastic tape is advanced as well, and on each tick two fingers probe down against the tape. The user can punch holes in the tape at desired times for the clock to trigger something, as it was set up it toggled the latching relay.

I got it cleaned up, mostly just scrubbing dust and grease of it. I wanted to leave the patina, because it's cool and old. I whipped up some Arduino code, and wired up some buttons.

The big button sends a single pulse. Holding the other protoboard button sends repeated pulses. And the whole thing sends a pulse every 60 seconds. Seems to work pretty good.

The plan is to get the timer and relay operating and mount it in some kind of case so people can admire it.

the arduino is against the spirit of this thing, you need to provide that 1/60 hz pulse with a fixed speed 120vac motor and reduction gears tripping a limit switch

# ¿ Jan 22, 2023 03:53

shame on an IGA: Apr 8, 2005

Hadlock posted:

I tried running one, then three and four servos (tower pro 80/90s, little tiny toy things) off an arduino. One would run ok, two would run ok. Four moving at the same time would create a voltage dip so severe it would restart the arduino. Servos pull way more power than an LED, but same general concept. Had to buy a controller/daughter board with it's own dedicated power supply to feed the controller board. Pretty sure adafruit sells some sort of LED controller daughterboard. I would guess they're in the $8-25 range depending on need

Yeah best practice in the industrial PLC world is to run controllers, input sensors and output actuators from three independent power rails

# ¿ Feb 1, 2023 12:31

shame on an IGA: Apr 8, 2005

very simple solution for your pump issue: don't direct the flow from the pump onto the plates at all. Set up a bucket or bowl or tank above your plate with with some tubing and let the water gravity-feed where and at the flow rate you need, then just pump from a corner of the tray your plates are in back to the tank.

# ¿ Feb 3, 2023 02:58

shame on an IGA: Apr 8, 2005

Deadite posted:

That's interesting, I don't know much about lighting controls and thought this whole thing would be much simpler than it is turning out to be. Do the DMX LED controls come in smaller versions?

I make neon-style LED signs and I'm trying to animate my first sign, but if this works it opens up a whole new area for me.

For this first one I just need the three sections to blink in sequence to look like the teeth of a chainsaw are moving:

If that's going to be something that runs hours on end all the time I strongly encourage you to use either socketed or solid state relays, those cycle counts add up fast and you don't want to have to bust out the soldering gun every time you need to replace them

# ¿ Sep 27, 2023 19:20

shame on an IGA: Apr 8, 2005

Foxfire_ posted:

Mohamed Atalla can have an alliterative superhero name for making all of modern electronics possible.

For those, there is no real way to know definitively since there's basically no documentation. Basically just guess because n-channel are more common. A less sketch/more expensive part would be telling you the chip on it, and the datasheet will say what kind it is (+lots of other things like max temp, transfer functions, switching speed, ...)

the linked board is available with buyers choice of four different mosfets and the descriptions say exactly which ones they are?

# ¿ Sep 29, 2023 03:00

shame on an IGA: Apr 8, 2005

cruft posted:

On the one hand, I'm really proud of myself for squeezing enough performance out of an 8MHz CPU to get software-debounced drum pad hits that apparently only close the momentary switch for under 20ms.

On the other hand, I'm appalled that this chip is running at almost twice the clock speed of my first desktop computer, and all I'm doing with it is asking over and over if 14 buttons have been pressed.

asking if buttons have been pressed is the only thing computers do if you think about it too much

# ¿ Jan 3, 2024 18:58

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# ¿ May 14, 2024 06:49

shame on an IGA: Apr 8, 2005

Hadlock posted:

Yeah there's almost some sort of host client negotiation going on. The controller is almost certainly sending a digital signal not raw analog values. The last fully analog controller was possibly the Atari 2600 joystick

even just on/off digital buttons have been fully serialized since at least the NES, probably earlier

# ¿ Jan 7, 2024 23:30

The Something Awful Forums > Discussion > Hobbies, Crafts, & Houses > Arduino: Eh, just grab some pliers and bend the pins