The DOIT ESP32 DevKit V1 device summary states:
“The device can operate on an external supply of 6 to 20 volts. If using more than 12V, the voltage regulator may overheat and damage the device. The recommended range is 7 to 12 volts.”
Yet we are powering the units with 5v USB input. What accounts for this discrepency?
In my opinion that documentation is incorrect. The DOIT ESP32 DevKit V1 on-board voltage regulator is the AMS1117. It is configured to convert 5V into 3.3V (you can check that with a multimeter). So, you don’t need to worry about the input voltage, but you just need to check if the on-board voltage regulator has enough voltage to convert to 3.3V (which is the required voltage for the ESP32 chip work correctly).
However, your input voltage can be 6V or a bit higher (it will convert it to 3.3V). Supplying a higher voltage might cause overheating.
Thanks Sara. So I’m clear and don’t damage the board, how would I measure it, ie, where do I place the probes?
With the ESP powered up:
- place a probe in the GND pin
- the other on the voltage regulator Vout pin
It should measure 3.3V to power the ESP32 chip.
Take a look at the voltage regulator pinout on the datasheet to locate the pins: http://www.advanced-monolithic.com/pdf/ds1117.pdf