MQ7BlueTooth

Overview

• Name : MQ7BlueTooth

• Description :

A project to read an MQ7 carbon monoxide(CO) sensor and transmits its data via bluetooth module.

• Author: Gavin Lyons

Software

Libraries

• MQ7.h
• <SoftwareSerial.h> // Arduino built-in for the bluetooth comms

Hardware

Bluetooth

ZS-040 CC2541 HM-10

This device is 3.3V logic level. SO for the MCU-transmit line we step down with a voltage divider to 3.3V logic to avoid damage to module.

Mq-7 sensor module

We use a power MOSFET to pulse the Sensor on/off at different voltages as per heating cycle described in datasheet.

Schematic

Output

Sensor Data

Notes

See also for more details

• MQ7 library
• Unified sensor library
• Datasheet
• AReResearch