I made a VR180 video at Montgomery Bell. You’ll need appropriate equipment to view this properly.
This is an automotive Voltage monitor. Draws 7mA in deep sleep mode.
This board was soldered with an iron because I didn’t feel like grabbing the solder paste and setting up my air station for a few small components. I think I prefer the air station for the tidy solder joints it gives.
Eagle files are here:
Here is a simple program to read the voltage. Note that it relies on the resistors being correctly set up (460k/1M) and may need to be calibrated. Note that while the base ESP modules work with a 1V comparator for the ADC, some development boards work with 3.3V (or supply voltage). It only writes to the serial, full HTTP integration will be coming shortly.