MQ-7 เป็นเซนเซอร์ตรวจจับก๊าซคาร์บอนมอนอกไซด์ (Carbon Monoxide) มี Output ให้เลือกใช้งานทั้ง Analog และ Digital โดยมี Potentiometer เป็นตัวกำหนดจุดทำงานในการอ่านค่าเซนเซอร์แบบ Digital โมดูลใช้ไฟเลี้ยง 3-5V

This is a simple-to-use Carbon Monoxide (CO) sensor, suitable for sensing CO concentrations in the air. The MQ-7 can detect CO-gas concentrations anywhere from 20 to 2000ppm.
This sensor has a high sensitivity and fast response time. The sensors output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC.
This sensor comes in a package similar to our MQ-3 alcohol sensor, and can be used with the breakout board below.
Features:
- Operating voltage: DC 3-5V.
- With the signal output indication.
- The dual signal output (analog output, and TTL level output).
- TTL output valid signal is low level, can connected to microcontroller directly.
- 0 ~ 5V analog output voltage, the higher concentration the higher voltage.
- With high sensitivity and good selectivity for CO.
- With a long service life and reliable stability.
- Rapid response and recovery characteristics.
- Size: 33mm*20mm*16mm(L * W * H)
- Detecting Range: 10 to 1000ppm
- Sensitivity: R in air/R in typical gas5
- Response Time：150s(70% Response)
- Recovery Time：150s(70% Response)
- Heating Resistance：313
- Heating Voltage：5.0V0.2V/1.5V0.1V
- Heating Power： about 350mW
- Measuring Voltage：24V
- เอกสารเพิ่มเติม
- MQ7 Datasheet