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

____________________________________________________________________________

สอนการใช้งานบอร์ด Arduino กับ Module sensor MQ-7 (Carbon monoxide sensor)

____________________________________________________________________________

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 sensor’s 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 gas≥5
• Response Time：≤150s(70% Response)
• Recovery Time：≤150s(70% Response)
• Heating Resistance：31Ω±3Ω
• Heating Voltage：5.0V±0.2V/1.5V±0.1V
• Heating Power： about 350mW
• Measuring Voltage：≤24V
• เอกสารเพิ่มเติม
• MQ7 Datasheet