Monkmakes CO2 Mini Kit for micro:bit with Crocodile Clips

The Monkmakes CO2 Mini Kit is a sensor board for the BBC micro:bit that measures CO2 concentrations from 400 to 5000 ppm. It integrates a Sensiron SCD41 CO2 sensor with temperature and humidity sensing, making it suitable for teaching coding, environmental science and data logging.

Overview

The board is powered directly by the micro:bit through its edge connector and includes reverse polarity protection to help prevent damage from incorrect connection. It communicates over a serial interface. The kit is supplied with five crocodile clip leads for secure attachment, and it is compatible with both V1 and V2 micro:bit models. Some advanced example projects in the manual require a V2 micro:bit.

Key Features

• Integrated Sensiron SCD41 CO2 sensor
• Temperature and humidity sensing
• Multi-colour LED indicator for at-a-glance air quality assessment
• Reverse polarity protection
• Serial interface
• Five crocodile clip leads included
• Compatible with V1 and V2 micro:bit models

Air Quality Indicator

The multi-colour LED changes colour according to the measured CO2 level. Green indicates good air quality below 1000 ppm CO2, orange indicates moderate levels below 3000 ppm, and red indicates poor air quality above 3000 ppm.

Applications

The kit enables students and makers to build projects that measure and log carbon dioxide levels, temperature and relative humidity. Examples include classroom air quality monitors, smart greenhouse controllers and data-logging experiments. By connecting sensor data to the micro:bit's programmable LEDs and sound output, users can create interactive systems that respond to environmental changes.

Specifications

• Sensor module: Sensiron SCD41
• CO2 measurement range: 400 - 5000 ppm
• Temperature range: -10°C to +60°C
• Humidity range: 0 - 100% RH
• Dimensions: 3.3 x 1.5 x 4.3 cm (width x depth x height)
• Weight: 56 g

The Monkmakes CO2 Mini Kit provides a compact way to monitor indoor air quality and climate conditions while developing coding and environmental science skills.