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).

Features

  • 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)

Resources

Buy

  • Bare PCB: 3€ 
  • Pre-assembled: 34€ 
  • Full set: 39€  

 

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.

Features:

  • 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

Resources

Status

  • Waiting for boards
  • Not tested

TaaraESP SHT21 Wifi Humidity sensor

Low cost Wifi Humidity sensor with ESP8266-7 or ESP8266-12 Wifi module and SHT21 digital humidity and temperature sensor. The board has on-board 3.3V regulator and can be powered from USB charger with USB-A socket. Deep sleep function is supported for entering ultra low power mode. There are also an on-board status LED and a PROG button for entering the program mode (hold down while power-up). Programming header is standard FTDI style UART serial interface. Humidity sensor is located away from other components and separated with cut out slot for better thermal isolation. The board dimensions are designed to fit the off-the-shelf enclosure.

Features:

  • Wifi module: ESP8266-7 or ESP8266-12
  • Digital humidity and temperature sensor: SHT21 or HTU21D
  • 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

Resources

Buy

  • Bare PCB: 3€ 
  • Pre-assembled: 35€ 
  • Full set 40€ 

ESP8266 DHT22 Wifi Humidity sensor

Low cost Wifi Humidity sensor with ESP8266 Wifi module and DHT22 digital humidity and temperature sensor. The board has on-board 3.3V regulator and can be powered from USB charger with USB-A socket. All the pins of the wifi module have broken out to breadboard-friendly 0,1″ headers. Unused pin is connected to 5V input for easier progamming. There is also LED and a button for entering the program mode (hold down while power-up) which makes this board suitable for prototyping and developing apps for ESP8266 Wifi module. When the Wifi module is constantly in full operational mode (with HTTP server etc.) it gets quite warm and can affect the temperature and humidity readings. Keeping the sensor 3-4mm away from the board and/or putting the module in sleep will resolve this problem.

Features:

  • Wifi module: ESP8266-03
  • Digital humidity and temperature sensor: DHT22
  • Supply voltage: 5V
  • Program button
  • Status LED

Resources

Buy

  • Bare PCB: 3€ 

1-Wire Thermocouple

1-Wire Thermocouple is a thermocouple to 1-wire converter board built around Maxim MAX31850 cold-junction compensated 1-Wire thermocouple-to-digital converter chip. The chip works only with 3.3V supply and logic level and there is on-board 3.3V LDO regulator and level converter for compatibility with 5V based 1-Wire networks. Due to the level shifting of the 1-Wire signals the only powering option is via 5V supply i.e. using parasite power is not supported.

Features

  • 1-Wire device: Maxim MAX31850
  • Thermocouple type: K (other types are supported by specific chip from the same family)
  • Resolution: 14-bit, 0,25°C
  • Temperature range: -200°C to +700°C
  • Accuracy: 2°C
  • Supply voltage: 5V
  • Parasite power: not supported
  • 1-Wire logic level: 5V
  • 1-Wire connector: RJ12 or RJ45

Resources

Credits

Buy

  • Bare PCB: 3€ 
  • Pre-assembled: 19€ 

 

1-Wire Humidity and Temperature sensor

1-Wire Humidity and Temperature sensor is a low-cost Open Source device for measuring temperature and relative air humidity in 1-Wire micro LAN network. 1-Wire network allows multiple devices connected on the same bus in parallel. Every 1-Wire device has a unique 64bit ID.

Features

  • 1-Wire device: Maxim DS2438Z+ ADC with internal 13-bit temperature sensor
  • Humidity sensor: HIH-5030 or HIH-5031 (condensation-resistant)
  • Supply voltage: 2,7-5,5V DC
  • Conformal coating option adds some additional protection against moist air
  • Wiring on the full set model with the RJ12 plug (compatible with Maxim DS9490R USB to 1-Wire adapter):
    1 – VCC (yellow)
    2 – NC
    3 – OW 1-Wire data (green or blue)
    4 – GND (red)
    5 – NC
    6 – NC (black or none)

Resources

Buy

  • Bare PCB: 3€ 
  • Pre-assembled: 30€ 
  • Full set: 35€  
  • Conformally coated full set 38€