Winsen MH-Z19E NDIR CO2 Sensor Air Quality Monitor
Winsen MH-Z19E NDIR CO2 Sensor for Air Quality Monitoring
The Winsen MH-Z19E is a non-dispersive infrared (NDIR) CO2 sensor offering accurate carbon dioxide concentration measurements in a compact, low-power package. It provides both UART serial and PWM output, making it ideal for air quality monitors, HVAC systems, and IoT environmental sensing. With a measurement range of 0–5000 ppm and built-in temperature compensation, it delivers reliable readings for indoor and outdoor applications.
Key Specifications
| Specification | Value |
|---|---|
| Detection Method | NDIR (Non-Dispersive Infrared) |
| Measurement Range | 0–5000 ppm |
| Accuracy | ±(50 ppm + 5% of reading) |
| Output | UART (TTL 3.3V), PWM |
| Operating Voltage | 4.5–5.5V DC |
| Warm-up Time | <3 minutes |
What You Can Build With This
- Desktop CO2 monitor with OLED display
- Smart ventilation controller using relay and WiFi
- Classroom air quality logger with SD card
- IoT indoor air quality dashboard with MQTT
Compatibility
The MH-Z19E operates on 5V logic but includes a 3.3V regulator, allowing direct connection to 5V and 3.3V microcontrollers like Arduino Uno, ESP32, and Raspberry Pi. It uses a standard 4-pin header (VCC, GND, TX, RX) and communicates via UART at 9600 baud, making it easy to integrate with popular development boards.
Wiring Notes
Connect VCC to 5V, GND to ground, and TX/RX to the microcontroller's RX/TX respectively. For PWM mode, use the PWM pin. Ensure a stable power supply; spikes may affect accuracy. The sensor requires a few minutes of warm-up for optimal readings.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino Uno?
Yes, connect the sensor's TX to Arduino pin 2 (SoftwareSerial RX) and RX to pin 3 (TX), or use hardware serial (RX to RX, TX to TX with voltage level shifting if needed).
What is the lifespan of the NDIR sensor?
The MH-Z19E has a long operational life of over 5 years under normal indoor conditions, as NDIR sensors have no consumable parts.
Does it require calibration?
The sensor comes pre-calibrated, but for high-accuracy applications, manual calibration using fresh air (400 ppm) is recommended periodically.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items