I have an ESP8266 that I've got connected to my arduino and communicating quite well with... Now I'm looking at options to run my conifig via battery, so need to find ways to shutdown the ESP8266.
Easiest way I have read is via the broken out CH_PD pin that is normally tied to 3.3v. However, further reading suggests that the TX/RX pins are 5v tolerant, the CH_PD is NOT. So what would be the best way to power the CH_PD from a digital pin.
Options are Connect the Arduino digital pin to:
- Voltage divider using resistors
- Transistor switch?
- small 100mA 3.3v regulator
I have no idea how much the CH_PD pin draws in mA... I assume very little. I've used voltage dividers for signal, but not for constant ON applications like this would be.