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€  

TaaraESP SHT21 USB Wifi Temperature and Humidity sensor

Next version of the Wifi Temperature and Humidity sensor with ESP8266 ESP-12S Wifi module and SHT21 digital humidity and temperature sensor with additional USB interface. 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 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). The board is now equipped with the serial to USB converter chip to make flashing and monitoring the sensor more convenient. Temperature and 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 ESP-12S
  • Digital humidity and temperature sensor: SHT21 or HTU21D
  • Supply voltage: 5V
  • USB serial interface: CH330N
  • Only TX/RX serial signals are connected to USB
  • DTR signal is not connected to USB
  • Program button
  • Status LED
  • Deep sleep function: supported
  • Home Assistant integration: ESPHome
  • Pins
    • LED: 13
    • SDA: 4
    • SCL: 5
  • Optional enclosure: Multicomp 1603603

Resources

Buy

  • Bare PCB: 3€ 
  • Pre-assembled: 37€
  • Full set 42€ 

Triple Base for WeMos

Triple base board for popular WeMos D1 (ESP8266) and WeMos S2 (ESP32) microcontroller boards and shields. Base board is designed for WeMos D1 boards but there is enough room on the sides to mount WeMos S2 with selected pin headers. There are prototyping areas between the double signal and power pins and rows of power pins (GND, 3.3V, 5V) on the bottom part of the board.

Features

  • Compatible with WeMos D1 (ESP8266) boards and shields
  • Partially compatible with WeMos S2 (ESP32) boards
  • Prototyping areas
  • Extra ground and power pins
  • Mounting holes
  • Headers are not included

Resources

Buy

  • Bare PCB: 5€

FTDI RX/TX Opto-Isolator

Simple Opto-Isolator board with only two channels to isolate RX and TX on UART communication lines. Both sides have FTDI style connectors but only GND, VCC and RX/TX are used. CTS and DTR are not connected. Also both sides need to have a separate power supply.

Features

  • FTDI style headers on both sides
  • Two channels – one in each direction
  • Speed up to 9600bps
  • Both sides need a separate power supply

Resources

Buy

  • Bare PCB: 3€
  • Pre-assembled: 10€

1-Wire Shield for WeMos D1

1-Wire Shield for WeMos D1 is 1-Wire to i2c bus converter board based on Maxim DS2482-100 Single-Channel 1-Wire Bus Master chip. It is used to off-load the time critical 1-Wire waveform generation from the MCU to the 1-Wire Bus Master to achieve error free operation with longer 1-Wire bus situations. Board header layout is compatible with WeMos D1 mini microcontroller boards. There is on-board strong pull-up mosfet and the level converter for 5V to 3.3V i2c interface.

Features

  • 1-Wire device: Maxim DS2482-100 Single-Channel 1-Wire Master
  • 1-Wire connector: RJ45 (RJ12 or 3-pin 3.5mm screw terminal on request)
  • Supply voltage: 5V from WeMos D1 board
  • i2c logic level: 3.3V
  • 1-Wire logic level: 5V
  • Strong pull-up capability

Resources

Credits

Buy

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

 

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

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€ 

M-Bus UART converter

Simple M-Bus to 3.3V UART level converter for 1..3 M-Bus slave devices. Board is designed to fit into off-the-shelve Kradex Z105 DIN enclosure. The board has an on-board 5V to 34V boost converter. UART input has an optional low voltage drop diode for the ESP8266 microcontrollers that do not boot when the TX line is pulled down.

Features

  • M-Bus voltage: 34 V
  • M-Bus slaves: 1..3
  • UART level: 3.3 V
  • UART connector: 3.5mm screw terminal
  • Supply voltage: 5 VDC
  • Fuse: 500mA @ 6V
  • Short circuit protection: none
  • Single layer PCB
  • Dimensions: 86x14mm
  • Board fits into Kradex Z105 DIN enclosure

Resources

Buy

  • Bare PCB: 3€ 


  • Pre-assembled: 25€


  • Pre-assembled with terminals: 30€

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€