ESP8266 Community Forum

- Fri Feb 18, 2022 7:07 am #93694 Hello,

Now that I have a working USB-powered 8266 TTGO board + CO2 sensor, I'd like to build a battery + USB powered alternative so I don't have to carry either a power bank or a USB charger.

The following page is nice, but the ~one hour long videos* (with computer-translated English subtitles) is a bit long to figure out how to put things together :

https://emariete.com/en/co2-meter-with- ... well-done/

Apparently, the following parts are needed:

• NodeMCU + OLED
• CO2 Sensor (eg. Senseair S8)
• Power management board, charger MCP73871
• Step up booster board
• Battery protection board
• Battery
• ? Soldering Flux

Would someone have a 1) simpler tutorial and 2) firmware to get the job done?

Thank you.

* https://youtu.be/y3QN1IYQx3Y and https://youtu.be/rjHRpDRk2fk

- Mon Feb 21, 2022 8:47 am #93714 Not sure if you have seen this one. This is quite detailed: https://emariete.com/en/meter-co2-esp82 ... nseair-s8/

- Mon Feb 21, 2022 10:02 am #93715 Yes, I've used it to build my first sensor. Now, I'd like to build one with a battery. It's a bit more involved, so was looking for a shorter/more practical tutorial than this page.

https://emariete.com/en/co2-meter-with- ... well-done/

I'll keep reading.