1-Wire Temperature, Humidity and Light Sensor

1-Wire Temperature, Humidity and Light sensor uses one DS2438 1-Wire chip for three different measurements. This board is very similar to the 1-Wire Humidity and Temperature Sensor – even the board size is the same. The only difference is added BPW 35 S photodiode from Osram and the current sense resistor for light level measurements. The actual calibration (if needed) should be done in the software or by replacing the current sense resistor (default 4.7k 1%, before nov 2018 it was 240Ohm).


  • 1-Wire device: Maxim DS2438Z+ ADC with internal 13-bit temperature sensor
  • Humidity sensor: HIH-5030
  • Silicon PIN Photodiode: BPW 35 S
  • Supply voltage: 2,7-5,5V DC
  • Wiring on the full set model with the RJ12 plug (compatible with Maxim DS9490R USB to 1-Wire adapter):
    1 – VCC 5V (yellow)
    2 – NC
    3 – OW 1-Wire data (green or blue)
    4 – GND (red)
    5 – NC
    6 – NC (black or none)



  • Bare PCB: 3€ 
  • Pre-assembled: 52€
  • Full set: 57€ 

NB! The price of main parts has increased significantly due to the chip shortage. Our prices are adjusted accordingly.


TaaraESP THBL Wifi Temperature Humidity Pressure and Light Sensor

Evolution of TaaraESP SHT21 Wifi humidity sensor with added pressure and light sensor. The LED and programming header work the same way as the previous model. Regulated 3.3V and GPIO2 are now available via unused pins on the programming header.


  • Wifi module: ESP8266-7 or ESP8266-12
  • Digital humidity and temperature sensor: SHT21 or HTU21D
  • Absolute Digital Pressure Sensor: MPL3115A2
  • Ambient Light Sensor: TSL2561
  • Pressure range: 20kPa to 110 kPa
  • Supply voltage: 5V
  • FTDI 0.1″ locking header for programming and debugging
  • UART logic level: 3.3V
  • Program button
  • Status LED
  • Deep sleep function: supported
  • Pins
    • LED: 13
    • SDA: 2
    • SCL: 14
  • Optional enclosure: Multicomp 1603603



  • Waiting for boards
  • Not tested