Help Needed: ESP8266, SIM800L, and MQ-7 Integration Issue

Projects General Guidance
1

I'm working on a CO detector project for cars. It's meant to alert emergency contacts if carbon monoxide levels get too high. I'm using an ESP8266, an MQ-7 sensor, a NEO6M GPS module, and a SIM800L GSM module.

Here's the problem:
When I connect the SIM800L to the ESP8266, the ESP8266 won't accept new program updates, and I can't see any responses in the PlatformIO serial monitor. Even though I tried connecting a common ground between the GSM and the ESP8266, it didn't fix anything. Strangely, everything works fine if I remove the GSM module, even when the MQ-7 is connected to an external power supply.

I found a temporary fix:
Once, I got it all to work by disconnecting the GSM module, updating the program, and then reconnecting the GSM module. After that, it was able to send SMS alerts.

Can anyone help me figure out what's causing this problem and how to fix it permanently?

Thanks a lot!

2

Here's a link You need: How to get the best out of this forum - Using Arduino / Project Guidance - Arduino Forum.

The schematics would be interesting to look at. "Connect" contains no information.

3

Apologies for not providing a schematic earlier. However, I've successfully resolved the issue. It turns out I mistakenly connected the Tx and Rx of the GSM to the Tx and Rx of the ESP8266. Once I rectified that mistake, everything went back to normal. I sincerely appreciate your assistance and apologize for any inconvenience caused.

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Good. You're up and running. That's the main thing.

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