Wifi – TaaraLabs

RS-485+CAN bus+DCDC Converter Shield for WeMos Mini

June 7, 2023 | ull | Comment | CanBus, ModBus, Wifi

RS-485 + CAN bus + DCDC Converter Shield for WeMos Mini is a small three-in-one board to fit on top of WeMos Mini (ESP32) microcontroller boards:

RS485 to TTL Serial transceiver with automatic flow control connects UART compatible GPIO pins on the microcontroller.
CAN bus Transceiver is suitable for 12 V and 24 V systems and it connects to ESP32 integrated CAN controller via GPIO pins.
DC/DC Converter allows powering the board and the microcontroller with 3.3 V from ~12 V DC source.

This board offers an easy and compact way to connect NMEA-2000 bus and/or one NMEA-0183 (RS-485/RS-422) device to WiFi network on a small boat using NMEA2000-Gateway with ESP32 software getting power from the NMEA-2000 bus or separate ~12 V DC source like 12 V battery.

Features

3.5mm screw terminals
Supply voltage: 12 VDC (3.8V-32V)
GPIO voltage: 3.3 V
DC/DC converter: AP63203
RS-485 transceiver with auto direction control: THVD1406
RS-485 interface connects to secondary UART on the WeMos Mini ESP32 boards
CAN bus transceiver: SN65HVD232
Optical isolation: none
GPIO pins for WeMos D1 Mini ESP32:
- RS-485
  - RX: GPIO16
  - TX: GPIO17
- CAN bus
  - RX: GPIO19
  - TX: GPIO18

Resources

Buy

Bare PCB: 3€
Pre-assembled: 21€
Pre-assembled with terminals: 26€

: Schematic

: Board Layout

RS-485 Shield for WeMos D1 Mini

March 21, 2023 | ull | Comment | ModBus, Wifi

RS-485 Shield for WeMos D1 is a half-duplex RS-485 to TTL Serial transceiver board for WeMos D1 Mini (ESP8266) and WeMos C3 Mini (ESP32) microcontrollers. This board was designed mainly for easy Wifi to Modbus connectivity using HomeAssistant‘s ESPHome Modbus Component.

Features

RS-485 chip: MaxLinear SP3485 or any other pin compatible RS-485 to TTL serial transceiver
RS-485 connector: RJ45 socket (TE / MOLEX) or 3.5mm 3-pin screw terminal
Supply voltage: 3.3V (from WeMos Mini microcontroller board)
Logic level: 3.3V
Serial interface connects directly to UART interface on the microcontroller (Serial debug should be disabled)
Esphome pins on WeMos D1 Mini (ESP8266) boards:
- TX: 1
- RX: 3
- Flow control: 2
Esphome pins on WeMos C3 Mini (ESP32) boards:
- TX: 21
- RX: 20
- Flow control: 6

Resources

Buy

Bare PCB: 3€
Pre-assembled: 12€
Pre-assembled with screw terminals: 17€
Pre-assembled with RJ45 socket: 17€

: Schematic

: Board Layout

TaaraESP SHT21 USB Wifi Temperature and Humidity sensor

August 20, 2021 | ull | 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€

: Pre-assembled

: Board layout

: PCB

: Schematic

Triple Base for WeMos

August 20, 2021 | ull | Comment | Tools, Wifi

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

Design files on GitHub

Buy

Bare PCB: 5€

: PCB

: Board layout

: Schematic

1-Wire Shield for WeMos D1

April 22, 2018 | ull | Comment | 1-Wire, Wifi

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

Design files on GitHub

Credits

Shield outline for the WeMos D1 Mini by SuperHouse Automation Pty Ltd

Buy

Bare PCB: 3€

Pre-assembled: 17€

: Schematic

: Board Layout

: PCB

: Pre-assembled

TaaraESP THBL Wifi Temperature Humidity Pressure and Light Sensor

November 18, 2016 | ull | Comment | Wifi

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

: Schematic

: Board layout

TaaraESP SHT21 Wifi Humidity sensor

October 13, 2015 | ull | 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€

: Schematic

: Board layout

: PCB

: Pre-assembled

: Full set

ESP8266 DHT22 Wifi Humidity sensor

January 27, 2015 | ull | 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€

: Schematic

: Board layout

: PCB