GxEPD VS nodemcu-devkit-v1.0

And the HelloWorld examples from GxEDP (https://github.com/ZinggJM/GxEPD) as well as GxEDP2 (https://github.com/ZinggJM/GxEPD2)

Hi thanks for your reply. The thing is that i couldn't seem to find demo code on the website though i did find a GitHub repo by MH-ET Live. Going through to the ESP32 file bring me hereto the GxEPD zip file. I've downloaded, included the library in my Arduino IDE and tried running the example code, commenting out all the 2.9" variants but still no luck, the programme freezes at the init stage with no change to the epaper display.

It works, you have to use some creative programming. Check out this library GxEPD and try running an example image (https://github.com/ZinggJM/GxEPD/blob/master/src/GxGDEW075Z08/BitmapExamples.h)

This appears to be a NodeMCU, which is an open source dev board: you can just look up the schematics

ESP8266 boards out there, such as the NodeMCU (see here, under ESP-12 Core), normally have a 100uF SMD Tantalum capacitor for this purpose.

It should be fine. The Vin pin is indeed normally Voltage IN but on the nodemcu board as per the schematics it should work given that the 5V supply is powerful enough. I've done it myself multiple times. What type of relay module do you have? Have you connected the grounds together if using separate power supplies?

Board: NodeMcu 1.0 (I de-soldered the LEDs and serial chip to save power once programmed)

The NodeMCU v1.0 is based on the CP2102. Doesn't get much eachier than that.

Guess my only solution would be having to wire it to the USB input somehow. If I could somehow find the VU pin it would allow me to perhaps solder that pin directly to the Vin pin? Unfortunately this version did not populate VU on the board. From what I can see in schematics,(This is V1 so it may not be true) VU has a Schottky Barrier Plastic Rectifier Diode (Schematic) between it and Vdd (VIn) Perhaps tapping into that port could work? (This is V1 so it may not be true) VU has a Schottky Barrier Plastic Rectifier Diode (Diagram) between it and Vdd (VIn)

I don't see VIN max mentioned there but https://github.com/nodemcu/nodemcu-devkit-v1.0/blob/master/Documents/NCP1117ST33T3G.PDF says 10V if yours has the 1117. Either way 12V is pushing it, and as I mentioned lead is greater than 12V when charged, just like other chemistries like Lithiums say ~3.7V but charged are actually around 4.2V

It has the same pinout as a NodeMCU except for that ADC pin where the NodeMCU has a reserved pin. The ADC pin might differ from the A0 pin by including a voltage divider to match a D1 mini, but I'm just speculating and I'd recommend not using it. It looks different because they put the parts of the ESP-12 module directly on the PCB, which is going to same some money on the build. You should be fine treating it like a NodeMCU.

Yes. If you look at the schematic and prints (that's 1.0, but not much has changed), that's R10. Connects GPIO16 (aka XPD_DCDC) to /RST (aka EXT_RSTB). From the ESP8266 datasheet: