Diode clipping just removes the top and/or bottom of the waveform, it doesn't increase the rise or fall time of the waveform. Your problem is simply...
Those parts should be OK but you can use a smaller Schottky diode if you like, it will only carry a few mA at most so a signal type rather than power...
Just swap the connections to the thick black primary coil. Take the white wire and the green wire and connect them to the opposite ends of the black...
We need to see the full code to be sure but as a guess I would say you have the watchdog timer enabled and are not resetting it. The result would be...
RFID fits all the requirements. All RFID tags have unique serial numbers which you can read so including or excluding a tag at point of entry is just...
I'm not sure about the flash, you would have to look closely at the ESP8266 data sheet to see if the timing and page layout is compatible. The one on...
You probably don't need the potentiometers, the values are predictable so you should be able to use fixed resistors.
I note you have no over-current...