Posts tagged with “mh-z19b”

Comparing MH-Z19B and SCD41: Building a Smarter CO₂ Monitor

Comparing MH-Z19B and SCD41: Building a Smarter CO₂ Monitor

A small device based on the MH-Z19B sensor has been sitting on my desk for years, quietly reminding me when it’s time to open a window and let some fresh air in. Its design is… well, not exactly elegant, but the utility more than makes up for any aesthetic shortcomings.
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Comparison of CO2 sensors MH-Z19B and CCS811

Comparison of CO2 sensors MH-Z19B and CCS811

I hooked up both the MH-Z19B and CCS811 CO₂ sensors side by side and logged data for a full week. The results? They mostly follow the same trends—but actual readings vary wildly, sometimes by 1000+ ppm. Which one’s accurate? Hard to say without a calibrated reference…

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Carbon Dioxide Sensor MH-Z19b - Part 2 - Software

Carbon Dioxide Sensor MH-Z19b - Part 2 - Software

In Part 2 of my CO₂ sensor project, I set up the MH-Z19b with Arduino and ESP8266 using PlatformIO. Added WiFi-based configuration with my own WiFiConfig library, and used RecurringTask to keep everything responsive without blocking the loop. It’s simple, wireless, and super easy to tweak from your browser!

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Carbon Dioxide Sensor MH-Z19b - Part 1 - Hardware design

Carbon Dioxide Sensor MH-Z19b - Part 1 - Hardware design

Ever feel like the air in your room gets a bit… stale? I picked up a cheap MH-Z19b CO2 sensor and built a simple home air quality monitor using an ESP8266 and some DIY magic. Here’s how I prototyped it (twice!) and got it up and running with WiFi and colorful LED alerts.

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