====== lamaPLC: MLX90614 (GY-906) infrared non-contact thermometer ======

{{ :sensor:mlx90614_1.png?140|MLX90614 infrared non-contact thermometer}}
The Hailege **MLX90614** is an //infrared thermometer for non-contact temperature measurement//s. Both the IR-sensitive thermopile detector chip and the signal conditioning ASIC are integrated in the same TO-39 can. Integrated into the MLX90614 are a low-noise amplifier, a 17-bit ADC, and a powerful DSP unit, thus achieving high accuracy and resolution for the thermometer.

The thermometer comes factory-calibrated with a digital SMBus output, providing full access to the measured temperature across the complete temperature range(s) with a resolution of 0.02°C.

The user can configure the digital output to use //pulse-width modulation// (**PWM**). By default, the 10-bit PWM continuously transmits the measured temperature in the range of -20 to 120°C, with an output resolution of 0.14°C.

**MLX90614 Features**

  * Factory calibrated in a wide temperature range: -40 to 125°C for sensor temperature and -70 to 380°C for object temperature
  * High accuracy of 0.5°C over a wide temperature range (0..+50 C for both Ta and To)
  * Medical accuracy of 0.1°C in a limited temperature range available on request
  * Measurement resolution of 0.02°C
  * Single and dual zone versions
  * SMBus-compatible digital interface for rapid temperature readings and building sensor networks
  * Customizable PWM output for continuous reading
  * Available in 3.3V and 5V versions
  * Simple adaptation for 8 to 16V applications
  * Power saving mode
  * Different package options for applications and measurement versatility
  * Automotive grade

{{page>:tarhal}}

===== MLX90614 (GY-906) Module Pinout =====
If you are using the blue breakout board, the pins are typically labelled on the back:

  * **VIN / VCC:** Power supply. Most modules support 3.3V to 5V because they include a voltage regulator.
  * **GND:** Ground reference.
  * **SCL:** Serial Clock for I²C communication.
  * **SDA:** Serial Data for I²C communication.

**Important Wiring Notes**

  * **Logic Levels:** The RP2040-ETH uses 3.3V logic. Ensure your sensor's VIN is connected to the RP2040's 3V3 pin to avoid damaging the GPIOs.
  * **Pull-up Resistors:** I²C communication requires pull-up resistors (typically 4.7 kΩ or 10 kΩ) on the SDA and SCL lines. Most GY-906 modules have these built-in.
  * **I²C Address:** The default factory address for the MLX90614 is **0x5A**

===== Source code =====
Read MLX90614 sensor values to RP2040_ETH over Micropython to serial: **[[code:rp2040_eth_modul_mlx90614_1|CODE]]**.  

===== I²C topics on lamaPLC =====
{{topic>i2c}}

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