MLX90614ESF Infrared IR Temperature Sensor Module
🌡️ MLX90614ESF Infrared Temperature Sensor
🛒 Popular Options
🧩 Overview
Non-contact infrared temperature sensor module
Based on MLX90614ESF thermopile sensor
Measures object temperature without touching
Communicates via I²C (SMBus compatible)
Works with Arduino, ESP32, Raspberry Pi
⚙️ Working Principle
Detects infrared radiation emitted by objects
Internal thermopile converts IR energy → voltage
Built-in DSP processes signal
Outputs:
🌡️ Object temperature
🌡️ Ambient (sensor) temperature
👉 Completely contactless temperature measurement
📊 Key Specifications
🔹 Operating Voltage: 3V – 5V
🔹 Current Consumption: ~2mA
🔹 Interface: I²C / SMBus
🔹 Object Temp Range: -70°C to +380°C
🔹 Ambient Temp Range: -40°C to +125°C
🔹 Accuracy: ±0.5°C (typical)
🔹 Resolution: 0.02°C
🔹 Field of View (FOV): ~5°
🔹 Response Rate: ~8Hz
🔌 Pin Configuration
🔴 VCC → 3.3V / 5V
⚫ GND → Ground
🟡 SDA → I²C Data
🟢 SCL → I²C Clock
👉 Default I²C address: 0x5A
🧱 Internal Components
IR thermopile sensor
Low-noise amplifier
17-bit ADC
Digital signal processor (DSP)
🔄 Features
Non-contact temperature sensing
Factory calibrated (no external calibration needed)
High accuracy & stability
Supports PWM + I²C output
Low power consumption
Works in harsh environments
🛠️ Applications
Contactless thermometers 🌡️
Human body temperature measurement
Industrial temperature monitoring 🏭
HVAC systems 🌬️
Food safety monitoring 🍲
IoT & smart sensing systems 🌐
Moving object temperature measurement
⚠️ Usage Tips
Maintain proper distance (1–5 cm typical)
Ensure object fills sensor field of view
Avoid reflective/metal surfaces
Use averaging/filtering for stable readings
Shield from airflow for accurate results
✅ Advantages
Contactless → safe & hygienic
High accuracy and resolution
Easy I²C interfacing
Low power consumption
Reliable for continuous monitoring
⚠️ Limitations
Accuracy affected by distance & emissivity
Measures surface temperature only
Narrow field of view
Sensitive to environmental conditions
🔍 Summary
A non-contact IR temperature sensor
Measures object & ambient temperature
Uses thermopile + DSP for accurate readings
Ideal for medical, industrial, and IoT applications
