ESP8266 Community Forum

While we ask questions - what devices (other than the esp) will be used?

While the esp is spec'ed for 1.8-3.6v (IIRC), other devices may require 3v or more. 2xAA is 2.4v (NiMH, though will start higher). I, for example, use a ds18b20 which requires at least 3v. I use 3xAA (or a 1xLi-Ion or 1xLiPo) with an MCP1700.

cheers

Eyal wrote:While the esp is spec'ed for 1.8-3.6v (IIRC), other devices may require 3v or more.

The SPI flash used on most ESP modules requires at least 2.7V. At lower voltages they may refuse to perform write operations.

Thanks for the aswers, and sorry not to follow up faster.

1/ (@AdamWu @Eyal) - Capacitor : how do you use the capacitor? between VCC and GND? So far I've had some 10uF, but today I've received a bunch of different capacities (from 10pF to 1mF) , so I will try them all.

2/ (@torntrousers, @Eyal)Other devices: I have just my ESP-12E to power.

3/ (@torntrousers) - 2 AA: In my first steps with ESP8266 I've tried and failed to power with 2xAA cells. That's why I've turned to 3.3V step-up or step-down modules. Can you please post me a basic schematic of your 2xAA + ESP logging to https://thingspeak.com/channels/74796 ?

No schematic but its just the batteries connected to an ESP12 on one of those white base boards, with a couple of bypass capacitors - 100uF and 100nF. It gave 19292 wakeup- wifi connect - http request - back to sleep cycles before dying. Here's a photo: