111–120 of 145 posts
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It melts. But only at high temperatures above 300. Even though the soldier is supposed to melt at 219. The iron is a LONOVE 925 m.
Maybe I need to try tinning the tip again.
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Does it have to be an ESP? There are other microcontrollers capable of driving an eink display that consume a lot less power out-of-the-box. Eg: atmega328 (~5 μA deep sleep, ~10mA running) If you want wifi, then ESP is probably a good and cheap fit. A wemos d1 in deep sleep doesn't consume _that_ much power (~80 μA), unfortunately it does draw a lot when booting (~200mA).
Yes, I need wifi. And there are esp32 boards that draw 20uA in deep sleep.
I'm working on an ESP32-based product that doesn't use sleep mode, but I've noticed people reporting issues about sleep mode on GitHub and in forums.
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I made lights using ws2812b leds and simulated sunrise, sunset, and a dim blue throughout the night. I used ws2812b leds, wemos d1, and a level translator since the d1 has 3.3v gpios but ws2812b technically requires a 5v signal.
I’ve been looking at something like this myself, did you use RGB, RGBW, RGBWW, RGBCCT or what to dynamically set the warmth of the light? I got really confused when I started looking into all these different types
I have two rows of 32 lights, so a beefy supply was needed along with a few places where VIN was fed to the strip.
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That sounds awesome, can you do a write-up about it please?
For the software part, WLED [0] really does just about anything you’d want to do with those led strips. I drive the wemos d1 and led’s from a 12V battery with a 12-5V stepdown converter. I attach the 5V to the esp and the led’s. The 3.3V logic level works on the first led and is repeated at 5V to all subsequent led’s. [0] https://github.com/Aircoookie/WLED
I built something like this but more special-purpose. It just switches a USB-A power source on/off. I wanted it to control my 5-volt fish-tank lights. I didn't want to use a 120VAC smart switch for each light because I prefer to use a single USB hub to power them all, and a bonus feature was being able to PWM the lights so the fish aren't freaked out when the lights suddenly turn on 100% in the morning. I ordered PCB…
I am sure this is something will be able to answer: I need to build a custom board for an ESP32 which should support low-power deep sleep and which should contain some additional circuitry (is that what you call it?) to drive an Eink display. Basically this[1] board, but a different shape and better low-power sleep properties. If I wanted to design this board myself, how long would it take to learn this? Are there go…
With those schematics and KiCAD, you should be pretty much set. Take an hour or so watching KiCAD tutorials, it'll be worth it.
Also, spring for an ESP32-WROVER-KIT and use it to prototype with a dev board. That kit also supports JTAG debugging, which can be quite handy.
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Have you already made the circuit on a breadboard? If so, learning KiCAD and building the board from scratch would take around a week of afternoons. I really recommend it, designing PCBs is very enjoyable (at least to me).
How would I work with SMD components on a breadboard?
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Maybe I need to try tinning the tip again.
Yeah, sounds like it. Make sure the tip is tinned when touching the pads so heat transfer can occur more effectively.
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Yeah, sounds like it. Make sure the tip is tinned when touching the pads so heat transfer can occur more effectively.
I’ll need to watch some videos. I tried running but the solder always drips off the tip and doesn’t stick ️
Who has used RS232 voltage for serial in the last 10 years? I'd rather a few MOSFETs to cut the power to everything for lower power. I guess there is a specific market for this and it is not me. I have at least 20 of Esp8266 and esp32 boards around the house. A bit of fun to design and produce though. I would not bother with the ESP8266 anymore considering the marginal cost of the esp32 and it is a much better device…
Haha, we built this internally to use with Axiom scanners in our fulfillment centers which use RS232 interface, those scanners are 20 years old. I convinced my boss to let me sell these as open source since we found many cool IOT uses for them around the office as well, that's why you are getting the RS232 on there but most people probably will not need that feature, but hey... it is there if you need it :)
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I am sure this is something will be able to answer: I need to build a custom board for an ESP32 which should support low-power deep sleep and which should contain some additional circuitry (is that what you call it?) to drive an Eink display. Basically this[1] board, but a different shape and better low-power sleep properties. If I wanted to design this board myself, how long would it take to learn this? Are there go…
Have you already made the circuit on a breadboard? If so, learning KiCAD and building the board from scratch would take around a week of afternoons. I really recommend it, designing PCBs is very enjoyable (at least to me).
Then you can order your PCB at a local shop, manufacture it yourself (with toner transfer, a CNC at a hackerspace, etc) provided the traces aren't too thin and there are not too many layers (1 is easy, 2 is standard and cheap, more layers are expensive), or order it from china at a relatively low price (jlpcb or seedstudio will average something like $1/apiece).