When you mean it runs flawlessly, I assume you mean it compiled and downloaded without error? You are still seeing the power fluctuations with the hello world? When the board is erased, do you still see the power fluctuations? If so, check if the AMS1117 regulator is getting hot. It may be blown, ca...

On your kit, GPIO 0 is pulled up internally and has a button to pull down the IO when you need it.

Check with scope if you can. Your meter would average out the reading if its fluctuating continuously quickly enough. What is your power supply? Make sure it is not current limiting. Do you have anything on the console? Do you see any reset? It also seems like it gets a short or current limit every ...

No current limit set on the power supply?

Well you are right that it should work with 5V, since it should have a diode between USB power and the 5V input, at the input of the LDO. I'm just trying to see if you have too much confidence in your code, that would be causing the reset. I haven't used the Arduino IDE. I assume though that there a...

Any feedback?
Would like to know if you had any positive affects on your board.

- Are you able to erase the flash?
- Is this a sample program from ESP-IDF?
- Did it originally work with just USB power?

Hello, Since I had such great success in requesting a library for the MCP23S17, I'm going to see if I get lucky twice! Does anyone have a native ESP-IDF library working for the MCP795xx RTC/Calendar chip? I have found not one person on the web using this and the ESP32. In case anyone asked why I use...

I have found this info. ESP32 does not seem to have an internal bias / feedback resistor internal to the chip. So it would be needed externally "for the oscillator to reliably start up- it biases the amplifier into the linear region where noise can be amplified to get the crystal oscillator going." ...

Are you giving enough time for the crystal to stabilize after power up, before measurement? What is your layout like, trace length? I don't like that the datasheet says "Load capacitance at both ends should be configured according to the crystal’s specification." Usually there's a recommended load c...