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Carbon monoxide (CO) detector

Simple CO sensing design requires few external components

A carbon monoxide (CO) detector is a device that detects the presence of CO gases in order to prevent carbon monoxide poisoning. CO is a colorless, tasteless, and odorless compound produced by an incomplete combustion of carbon-containing materials. It is often referred to as the "silent killer" because it is virtually undetectable by humans without using detection technology. Elevated levels of CO can be dangerous to humans, depending on the amount of gas that is present and the length of exposure. Smaller concentrations can be harmful over longer periods of time, while increasing concentrations require diminishing exposure times to be harmful.

The sensor used for this design is based on an electrochemical function, as this is a type of fuel cell that is designed to produce a signal current that is precisely related to the amount of the target gas (in this case, CO) in the atmosphere.

The CO detector will measure CO levels over time and sound an alarm before dangerous levels of CO accumulate in an environment.

System Benefits:

  • Utilizes the new family of RA Arm®-based microcontrollers
  • Microcontroller contains the required amplifiers needed to level the input signals
  • Very few external components needed
carbon monoxide alarm device

Recommended products

Products Description Documents
Microcontroller    
RA2A1 48MHz Arm® Cortex®-M23 core with integration of a 24-bit sigma-delta ADC Datasheet
LDO    
ISL9001A LDO with low ISUPPLY, high PSSR Datasheet

 

System block diagram

block diagram
 

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