esp8266MQ2Sensor robotic.icu

robotic.icu: esp8266MQ2Sensor
Posted in: Specs | by Brian Taylor | 2026 Feb 17


esp8266MQ2Sensor -- More Picts - Open image

ESP8266, ESP32 & Microcontrollers
Massimiliano Balestrini · dnrtpooseS
Creator:
Hi! First time posting here, please have mercy on me. I was playing around with an esp envy board.
An ESP-12F based board, with a MQ2 gas sensor and an SHT30 temperature sensor. No USB chip, and little else, a voltage regulator and probably that's it.
I put Tasmota on it and tried deepsleep.
That's where the weird stuff (at least to me) begins. The board has it's own 10k resistor to VCC from RST, and a little button to trigger it.
When I connect GPIO16 to RST, the wake up signal doesn't seem to be enough to wake the device. The led flashes, albeit fainter, or so it looks to me. And the board does not come online.
If I reset it manually, or if I GPIO16 0 it to ”emulate” the wake up, it resets normally. Fixed IP, comes online almost imediately.
The resistance from RST to VCC if measured, gives 5.5k, but it's measured on the board, pratically in parallel with the ESP itself, so I don't know if that could be an issue. It's probably the combined resistance what I'm reading.
Don't know exactly what to try.
Thanks for your time!

Replies:
It looks nice, but I think one issue that could be serious. You have the DuPont header in the antenna's keepout zone. It would be best to have the antenna along the edge with no PCB copper under the antenna.
My suggestion would be to rotate everything in the section where the esp is, so the antenna is located where the version number is. Then it might work..

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