Carbon Monoxide Sensor with EFM Processor and Dual RS232 Interfaces

  • 3095

We currently have 2 in stock.


This module contains a Hanwei MQ-7 Carbon Monoxide Gas Sensor. The board contains an EFM32ZG108 Gecko low power microcontroller and two RS232 serial ports allowing it to be daisy chained in a network. Pre-Programmed for use in an openHAB Home Automation system or can be Re-Programmed for other uses.


  • Hanwei MQ-7 Carbon Monoxide Gas Sensor
    • Resistance of sensor varies based on CO concentration
    • Heating element varies temperature of the sensor
    • Detection range: 20ppm to 2000ppm CO
    • High stability and long life
  • CPC1002 Solid State Relay used to control heater
  • +5V Supply required for Sensor
  • Power management designed for very low standby power
  • Microcontroller cycles the heating element and monitors the voltage on a load resistor
  • EFM32ZG108 Gecko Microcontroller
    • ARM Cortex-M0+
    • Low Power Operation
    • 32KB Flash Memory
    • 4KB RAM
  • MAX3232 Dual RS232 Line Driver/Receiver
  • Two 4 Pin DF11 Right Angle Male Connectors each with Power and RS232
  • 6 Pin DF11 Right Angle Male Connector for Programming and Debug
  • PCB 20mm x 34mm (0.8" x 1.3")
  • Pre-Programmed with openHAB Item Firmware for Plug-and-Play
  • Pre-Programmed Firmware is Designed for Low Power Operation
  • May be Programmed with the Arduino IDE


Board Files
MQ7 Data Sheet
CPC1002N Data Sheet
EFM32TG110 Data Sheet
EFM32TG Reference Manual

Arduino IDE Examples:



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