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-5031 (condensation-resistant)
  • 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)
    4 – GND (red)
    5 – NC
    6 – NC (black)

Resources

Buy

  • Bare PCB: 3€ 
  • Pre-assembled: 30€ 
  • Full set: 35€  

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.

Features

  • 1-Wire device: Maxim DS2438Z+ ADC with internal 13-bit temperature sensor
  • Humidity sensor: HIH-5031 (condensation-resistant)
  • 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)
    4 – GND (red)
    5 – NC
    6 – NC (black)

Resources

Status

  • Waiting for boards

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

1-Wire Passive 5-port HUB

A simple 1-Wire Passive 5-Port HUB with five RJ-45 sockets connected in parallel on a small board with two 3 mm mounting holes, black soldermask and white numbered labels.

Features

  • RJ45 sockets: 5
  • Type: parallel
  • Panelization: 4 boards on panel, not v-grooved

Resources

Buy

  • PCB panel: 10€ 
  • Pre-assembled: 15€ 

1-Wire Slave i2c bridge Plug

The main purpose of DS28E17 device and this board is to use i2c slave devices like sensors and low power microcontroller boards over much longer 1-Wire networks.

1-Wire Slave to i2c bridge Plug consists of DS28E17 chip, an on-board 3.3V LDO regulator and 5V to 3.3V level shifter for interfacing 3.3V DS28E17 device with 5V 1-Wire bus. There are also three optional LED indicators for debugging. The board layout is compatible with TaaraNode and JeeNode boards but can be used with any other 3.3V low power microcontroller board or i2c device.

Features

  • 1-Wire Slave to i2c bridge device: DS28E17
  • Supply voltage: 5V from 1-Wire bus
  • 1-Wire logic level: 5V
  • i2c logic level: 3.3V
  • On-board 3.3V regulator
  • LED indicators: BUSY, ED (Error Detected) and XD (Expecting Data)
  • Headers: 0,1″
  • 1-Wire connector: RJ45 or RJ12

Resources

Buy

  • Bare PCB: 3€ 
  • Pre-assembled: 20€ 

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€ 

Serial OLED

Serial OLED is a small adapter board for cheap 128×64 0,96″ OLED i2c display module and it can be used as a serial console for microcontroller projects with 3.3V logic level. One of the four microswitches is hardwired as the reset for the Serial OLED board. Other three switches are connected to the digital pins of the on-board microcontroller. The additional FTDI connector (host) can be used to program the Serial OLED board itself.

There are two popular models of cheap 0,9″ OLED displays based on SSD1306 driver IC available on the ebay. They are slightly different size (27x27mm and 27x28mm) and the supply polarity is different. This adapter board fits both modules and the supply polarity for the OLED module can be set by the solder-jumpers.

Features

  • Compatible with 27x27mm and 27x28mm 0,9″ i2c OLED modules
  • OLED module supply voltage polarity set by solder-jumpers
  • Onboard Atmega-328p microcontroller
  • Logic level: 3.3V
  • Supply voltage: 5V
  • Reset switch
  • User assignable switches: 3

Resources

  • Design files on GitHub

Buy

  • Bare PCB: 3€ 
  • Pre-assembled: 15€ 
  • Full set: 25€ 

FTDI Micro

FTDI Micro is simple USB to UART serial adapter based on FT232R chip. The board is pre-configured for 3.3V logic level but with the solder-jumper can be set to 5V logic level as well.

Features

  • Micro USB socket
  • USB UART interface chip: FT232R
  • Logic level: 3.3V default, 5V optional
  • USB port protection with polyfuse
  • TX LED: Red
  • RX LED: Green

Resources

Buy

  • Bare PCB: 3€ 
  • Pre-assembled: 15€ 

 

LCD Plug

LCD Plug is TaaraNode and JeeNode compatible i2c driver board for HD44780 based 16-pin LCD displays. This board is based on JeeLabs LCD Plug with additional Port header.

Features

  • Compatible with HD44780 based LCD displays
  • Interface chip: MCP23008 8-bit port expander
  • Default logic level: 3.3V
  • Optional logic level: 5V
  • Software controlled backlight: on/off

Resources

Credits

Buy

  • Bare PCB: 3€ 
  • Pre-assembled: 8€ 

 

RTD Plug

RTD Plug is TaaraNode and JeeNode compatible MAX31865 based SPI inferface board for PT100/PT1000 temperature sensors.

Features

  • RTD to Digital converter: MAX31865
  • Compatible with 2-, 3-, and 4-wire Sensor Connections
  • Interface: SPI
  • Supported sensors: PT100 (PT1000 option)
  • Supply voltage: 3.3V
  • Headers: 0.1″

Resources

Credits

Buy

  • Bare PCB: 3€ 
  • Pre-assembled: 24€ 

 

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€