Carbon monoxide sensor in Home Assistant - everyone does it wrong!

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In this video, I'm making a carbon monoxide monitor for my home using an MQ7 carbon monoxide sensor, a DHT11 temperature and humidity sensor, and a NodeMCU microcontroller board.

This sensor is beneficial for places where there is a fire source such as a stove or boiler, to monitor carbon monoxide build-up and adjust ventilation accordingly.

There are plenty of tutorials on using the MQ7 sensor, but none are actually measuring as per what the datasheet requires. It states that the sensor should be heating up and cooled off in cycles, and only measured at the end of each cycle. To achieve that, the MQ7 module needs to be modified so instead of having a digital output pin, we can use that pin to control the applied voltage on the heater inside the sensor.

This is not a simple modification so only attempt it if you are comfortable working with SMD components. In the end, one of my sensors failed for unknown reasons so approach this project at your own risk.

If you like what I do, feel free to support the channel!
https://www.tastethecode.com/support

Tools and materials used in the video:
MQ7 Carbon Monoxide Sensor Module - https://s.click.aliexpress.com/e/_Dmq...
DHT11 Temperature/Humidity Sensor - https://s.click.aliexpress.com/e/_DEv...
NodeMCU Development Board - https://s.click.aliexpress.com/e/_mOv...
ESP32 board - https://s.click.aliexpress.com/e/_oCw...
Soldering Rework Station - https://s.click.aliexpress.com/e/_onZ...
Desoldering wire - https://s.click.aliexpress.com/e/_EQ7...
Wire snippers - https://s.click.aliexpress.com/e/_Dd9...
Wire strippers - https://s.click.aliexpress.com/e/_DmQ...
Tweezers - https://s.click.aliexpress.com/e/_Ddk...
Project box - https://s.click.aliexpress.com/e/_Dkw...
RD6012 Bench power supply - https://s.click.aliexpress.com/e/_DBQ...

The ESPHome Devices guide on the modification can be found below:
https://devices.esphome.io/devices/MQ-7

My recording gear:
Canon M50 Mark ii - https://s.click.aliexpress.com/e/_ALp9Sp
Dragon Touch 4K Action Camera - https://s.click.aliexpress.com/e/_mrc...
USB Condenser Microphone - https://s.click.aliexpress.com/e/_DF5...
Tripod - https://s.click.aliexpress.com/e/_Del...
Phone tripod mount - https://s.click.aliexpress.com/e/_s9WaiJ

The MQ7 sensor datasheet can be found below:
https://www.sparkfun.com/datasheets/S...

Carbon monoxide sensor in Home Assistant - everyone does it wrong!
#carbonmonoxide #sensor #homeassistant #CO #tastethecode

00:00 - Introduction to MQ7 sensor
01:05 - Overview of the final CO monitor device
01:27 - How to properly use the MQ7 sensor
02:08 - Overview of available modules for the MQ7 sensor
02:40 - ESPHome recommended modification
03:44 - Sponsor info
04:24 - How I modified my MQ7 module
05:05 - Sensor calibration
05:35 - Creating an enclosure
06:19 - Code for the MQ7 sensor in Home Assistant
07:08 - Testing the sensor readings
08:02 - Challenges and issues with the modification
09:50 - Summary and next steps

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This video is a part of a 26 video series on Home Automation DIY Devices as part of the Alphabet Superset challenge! https://www.alphabetsuperset.com/

Thanks @struthless for organizing this! #alphabetsuperset