TaaraESP SHT21 USB Wifi Temperature and Humidity sensor

August 20, 2021 |   |  Comment  |  Wifi

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€ 

TaaraESP SHT21 Wifi Humidity sensor

October 13, 2015 |   |  Comment  |  Wifi

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€ 

FTDI Micro

February 1, 2015 |   |  Comment  |  Tools

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€ 

 

ESP8266 DHT22 Wifi Humidity sensor

January 27, 2015 |   |  Comment  |  Wifi

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€