Monitoring my home's air quality (CO2, PM2.5, Temp/Humidity) with AirGradient's DIY sensor

A few months ago, I found this Hacker News post about the AirGradient DIY Air Quality Monitor. I had already been considering buying an AirThings Wave Plus sensor to monitor my home's CO2 levels, but the high price and limited 'ownership' of the data coming from it turned me off.

AirGradient DIY Air Quality Sensor - Focus Stacked by Jeff Geerling

So I built two AirGradient DIY air quality monitor boards (see above), and integrated them into my Prometheus + Grafana home monitoring setup I've been using to monitor other things in my house:

AirGradient DIY Grafana Dashboard for CO2 PM2.5 Temperature Humidity monitoring

The Raspberry Pi Pico is a new $4 microcontroller

Raspberry Pi Pico on breadboard

tl;dr: The Raspberry Pi Pico is a new $4 microcontroller board with a custom new dual-core 133 MHz ARM Cortex-M0+ microprocessor, 2MB of built-in flash memory, 26 GPIO pins, an assortment of SPI, I2C, UART, ADC, PWM, and PIO channels.

It also has a few other party tricks, like edge castellations that make it easier to solder the Pico to other boards.

The Pico is powered by a new RP2040 chip—a brand new Raspberry-Pi-built ARM processor. And the best thing about this processor is the insanely-detailed Datasheet available on the Pico website that steps through every bit of the chip's architecture.

Video Review and 'Baby Safe Temperature' Project

I posted an entire video reviewing the Pico and demonstrating a MicroPython project. The video is embedded below:

Raspberry Pi Zero - Power Consumption Comparison

tl;dr: The Raspberry Pi Zero uses about the same amount of power as the A+, and at least 50% less power than any other Pi (B+, 2 B, 3 B).

On November 26, the Raspberry Pi foundation announced the Raspberry Pi Zero, a $5 USD computer that shares the same architecture as the original Raspberry Pi and A+/B+ models, with a slightly faster processor clock (1 Ghz), 512 MB of RAM, and sans many of the essential ports and connectors required for using the Pi as an out-of-the-box computer.

Raspberry Pi Zero - new with adapter cable
The Raspberry Pi Zero - quite a small Linux computer!