{"product_id":"mq-138-formaldehyde-hcho-gas-sensor-module-with-al","title":"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","description":"\u003cdiv\u003eMQ-138 HCHO Gas Sensor Module for DIY Air Monitors\u003cbr\u003e\n✔️ 5V DC, 180mA, 1-100ppm range, \u0026lt;1S response, alarm LED, Pack: 1 pc \u003cp\u003eThe 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.\u003c\/p\u003e \u003cp\u003e✅ Heating voltage: 5 ±0.2V (AC\/DC) \u003cbr\u003e\n✅ Working current: 180mA \u003cbr\u003e\n✅ Circuit voltage: DC5V (Max DC24V) \u003cbr\u003e\n✅ Load resistance: 10K (adjustable) \u003cbr\u003e\n✅ Test concentration range: 1-100ppm \u003cbr\u003e\n✅ Clean air voltage: \u0026lt;1.5V \u003cbr\u003e\n✅ Sensitivity: \u0026gt;3% \u003cbr\u003e\n✅ Response time: \u0026lt;1S (3-5 min warm-up; 48 h preheating) \u003cbr\u003e\n✅ Life: 5 years \u003cbr\u003e\n✅ Size: 35mm × 40mm × 28mm \u003cbr\u003e\n✅ Weight: ~15g \u003cbr\u003e\n✅ Humidity: 95% RH (nominal 65% RH) \u003cbr\u003e\u003c\/p\u003e \u003cp\u003eThe 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.\u003c\/p\u003e \u003cp\u003e💡 What is a MQ-138 HCHO gas sensor module used for in DIY air quality monitors?\u003c\/p\u003e\n\u003cp\u003e This handy device helps hobbyists monitor formaldehyde and VOCs in indoor air using a microcontroller. \u003c\/p\u003e\n- Handy for indoor air quality projects with a microcontroller \u003cbr\u003e\n- Works with 5V platforms for quick setup \u003cbr\u003e\n- Includes visual LED alert for easy monitoring \u003cbr\u003e \u003c\/div\u003e","brand":"Amazon","offers":[{"title":"Default Title","offer_id":48737074446571,"sku":"VXB082386TW7","price":99.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/3268\/0683\/files\/71EhBJRrx0L.jpg?v=1780623151","url":"https:\/\/vxb.com\/products\/mq-138-formaldehyde-hcho-gas-sensor-module-with-al","provider":"VXB Bearings","version":"1.0","type":"link"}