1-Wire Slave i2c bridge Plug

October 19, 2015 |   |  Comment  |  1-Wire, TaaraNode

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€ 

Serial OLED

February 25, 2015 |   |  Comment  |  Tools

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

Buy

  • Bare PCB: 3€ 

LCD Plug

February 1, 2015 |   |  1 Comment  |  TaaraNode

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

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  • Bare PCB: 3€ 

1-Wire Plug

January 22, 2015 |   |  Comment  |  1-Wire, TaaraNode

1-Wire Plug 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 TaaraNode and JeeNode microcontroller boards. There is on-board 5V LDO regulator, strong pull-up mosfet and the level converter for 5V to 3.3V i2c interface.

Features

Resources

Buy

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