mLink I2C Temperature, Humidity, Pressure, Light Sensor module

£8.99
VAT included

The mLink Environmental Sensor Module combines multiple precision sensors to monitor temperature, humidity, atmospheric pressure, ambient light, and white light levels. Designed for easy integration with microcontrollers via mLink I²C interface, this module provides accurate and reliable environmental data for weather stations, automation systems, indoor climate monitoring, and more.

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The mLink Environmental Sensor Module combines multiple precision sensors to monitor temperature, humidity, atmospheric pressure, ambient light, and white light levels. Designed for easy integration with microcontrollers via mLink I²C interface, this module provides accurate and reliable environmental data for weather stations, automation systems, indoor climate monitoring, and more.


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mLink I²C Interface

  • Microcontroller Compatibility: Works with any microcontroller or development board with a standard I²C interface
  • Expandable System: Seamlessly daisy-chain with other mLink modules (e.g., displays, relays, input devices) using a single I²C connection
  • Unified Library: A single Arduino library or Raspberry Pi module with a tiny memory footprint enables control of all connected mLink modules.


Arduino & Raspberry Pi Support

  • Arduino: An Arduino library is available via GitHub, PlatformIO, or directly from out support forum.
  • Raspberry Pi: A Raspberry Pi Compatible Python module is available via PyPi for easy installation.s
  • Resources Provided: Code example(s) and documentation are available to help you get started quickly


Use Cases

  • Smart weather stations
  • Environmental monitoring
  • Greenhouse automation
  • Indoor lighting control based on ambient conditions
  • Climate-aware IoT systems



Module Specifications:

Product code:				HCMODU0265
Supply Voltage:				5V via mLink header (3.3V via solder pad)
Supply current:				~700uA (idle), ~170uA (sleep)
Temp sensor range:			-40 to 85oC
Temp sensor resolution:		0.01oC
Hum sensor range:			0 to 100%RH
Hum sensor resolution:		0.024%RH
Pressure sensor range:		300 to 1100hPa / mBar
Pressure sensor resolution:	0.01hPa / mBar
Light sensor range:			0 to 35232lx
Light sensor resolution:		0.54lx
I²C Interface speed:			400kbits/s (fast mode)
I²C default address (HEX):		0x61
Maximum number of modules:	5 with pullups fitted, 112 with pullups removed*
Module dimensions: 			27mm x 21mm x 11.5mm (excluding headers)

*Note: Do not exceed 5 mLink modules in series with pullups fitted to all modules. For chaining more modules, see the mLink pullup configuration guide.





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/* FILE:    mLink_Env_Sensor_Example.ino
   DATE:    23/06/25
   VERSION: 1.0
   AUTHOR:  Andrew Davies
   
 
This sketch uses the mLink library to repeatedly read the
sensors of the mLink environmental sensor module and output
the result to the serial monitor.
 
Please see Licence.txt in the library folder for terms of use.
*/
 
 
#include "mLink.h"                          // Include the library
 
mLink mLink;                                // Create an instance of the library
 
#define I2C_ADD 0x61                        // Default I2C address
 
 
void setup()
{
  Serial.begin(9600);
 
  mLink.init();                             // Initialise the library
}
 
 
void loop()
{
  mLink.wake(I2C_ADD);                      // Wake device
 
  mLink.envSens_Trigger(I2C_ADD);           // Trigger a measurement
 
  while(mLink.busy(I2C_ADD));               // Wait until done
 
  float tmp = mLink.envSens_Temp(I2C_ADD);  // Get new temperature (oC)
  float hum = mLink.envSens_Hum(I2C_ADD);   // Get new humidity (%RH)
  float prs = mLink.envSens_Pres(I2C_ADD);  // Get new pressure (mbar/hPa)
  float amb = mLink.envSens_Amb(I2C_ADD);   // Get new ambient light (lux)
  float wht = mLink.envSens_Wht(I2C_ADD);   // Get new white light (lux)
 
  mLink.sleep(I2C_ADD);                     // Go back to sleep
 
  // Print the results
  Serial.print("Temp:\t"); Serial.println(tmp);
  Serial.print("Hum:\t"); Serial.println(hum);
  Serial.print("Pres:\t"); Serial.println(prs);
  Serial.print("Amb:\t"); Serial.println(amb);
  Serial.print("White:\t"); Serial.println(wht);
  Serial.println("");
 
  delay(2000);
}




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When connecting to a Raspberry Pi the mLink modules I2C pullup resistors should be removed. See the 'Removing the modules I2C pullup resistors' section below for more information.

 

# mLink environmental sensor example
# This example demonstrates how to read the various sensors of the
# mLink Environmental sensor module.
#
# To use this script you will need to have the mLink module installed.
# Please see library forum thread for more information:
#
# https://forum.hobbycomponents.com/viewtopic.php?f=131&t=3135
 
 
 
from mLink import mLink                     # Import the mLink module
import time
 
ml = mLink.mLink(1)                         # Create an instance of the module
 
I2C_ADD = 0x61                              # Default I2C address is 0x61
 
 
 
while 1:
   
    ml.envSens_Trigger(I2C_ADD)
   
    while (ml.busy(I2C_ADD)):               # Wait for data to be transmitted
        continue
   
    tmp = ml.envSens_Temp(I2C_ADD)          # Get temperature in oC
    hum = ml.envSens_Hum(I2C_ADD)           # Get humidity in %RH
    prs = ml.envSens_Pres(I2C_ADD)          # Get pressure in mBar/hPa
    amb = ml.envSens_Amb(I2C_ADD)           # Get ambient light in lux
    wht = ml.envSens_Wht(I2C_ADD)           # Get white light in lux
   
    print("Tmp =", tmp);                    # Print the results
    print("Hum =", hum);
    print("Prs =", prs);
    print("Amb =", amb);
    ​​print("Wht =", wht, "\n");
 
 
For more information including links to Arduino and Raspberry Pi libraries please see our support forum here
HCMODU0265
8 Items

Specific References