MQ-138 Formaldehyde HCHO Gas Sensor Module With Alarm Light For DIY Air Quality Monitors Detects VOCs From 1 To 100 PPM, Fast Response And 5V DC Heating, Plug And Play Sensor For Microcontroller Projects
✔️ 5V DC, 180mA, 1-100ppm range, <1S response, alarm LED, Pack: 1 pc
The MQ-138 HCHO gas sensor module detects formaldehyde and VOCs in indoor air. It's a popular choice for DIY air quality monitors and microcontroller projects that need fast, real-time gas readings.
✅ Heating voltage: 5 ±0.2V (AC/DC)
✅ Working current: 180mA
✅ Circuit voltage: DC5V (Max DC24V)
✅ Load resistance: 10K (adjustable)
✅ Test concentration range: 1-100ppm
✅ Clean air voltage: <1.5V
✅ Sensitivity: >3%
✅ Response time: <1S (3-5 min warm-up; 48 h preheating)
✅ Life: 5 years
✅ Size: 35mm × 40mm × 28mm
✅ Weight: ~15g
✅ Humidity: 95% RH (nominal 65% RH)
The MQ-138 HCHO gas sensor module is a handy tool for measuring formaldehyde and VOC levels in indoor spaces. It’s commonly used in DIY air quality projects with microcontrollers to provide real-time alerts and data logging.
💡 What is a MQ-138 HCHO gas sensor module used for in DIY air quality monitors?
This handy device helps hobbyists monitor formaldehyde and VOCs in indoor air using a microcontroller.
- Handy for indoor air quality projects with a microcontroller- Works with 5V platforms for quick setup
- Includes visual LED alert for easy monitoring