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

Status

  • Not tested
  • Waiting for PCB’s from the manufacturer

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. There are two options to power the board – either using an external 34V DC power supply connected to directly to the 34V input or with the optional DC-DC boost converter and 5V power supply.

Features

  • M-Bus voltage: 34V
  • M-Bus slaves: 1..3
  • UART level: 3.3V
  • UART connector: 3.5mm screw terminal
  • Supply voltage: 34VDC
  • Optional on-board CN6009 5V-34V DC-DC converter
  • Short circuit protection: none
  • Single layer PCB
  • Dimensions: 86x14mm
  • Board fits into Kradex Z105 DIN enclosure

Resources

Status

  • First home-made SMD prototype is working
  • Waiting for PCB-s from the board-house

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

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€