I/O Experimenter Board (PCB version)
Most embedded projects require the same common stuff, basically I/O devices such as switches, LEDs, LCD display, buzzer, etc. Connecting these things on a breadboard for prototyping every new project is time consuming and boring. Recently, I have designed a general purpose I/O experimenter board that will not only reduce the prototyping time for a new project but also free up plenty of space on the breadboard.
This is actually a PCB version of my old project (A DIY I/O board for experimenters) with some additional features such as DS1307 RTC with battery back up and SPI seven segment LED display (4 digits). Here’s a list of the full features on board:
- On board +5V regulator IC (AMS1117 or equivalent).
- 16-pin female header for HD44780 based character LCD interface. Data (4-bit mode) and control pins are accessible through headers. A contrast adjustment potentiometer is available on the board. LCD backlight is turned ON and OFF using a 2-pin jumper)
- ON board MAX7219 provides 3-wire SPI interface to control a 4-digit seven segment LED display. The PCB is designed for any XX-5641AX series 0.56″ CC display module (4-digit), such as NFD-5461.
- IC Sockets for 24CXX EEPROM and a DS1307 RTC. I2C signal lines are accessible through headers.
- Socket for LM34 or any other analog temperature sensor that operates at +5V.
- A piezo buzzer with a transistor driver
- A potentiometer for ADC input signal
- A 2N2222 transistor open collector output for small load PWM demo
- 8 LEDs
- 4 Tact switches
The PCB size is approximately 3.94″ x 3.94″ (10cm x 10cm) and is manufactured from ITEADSTUDIO. I have got 10 PCBs of this I/O board and I am keeping 2 for myself and giving away rest of them for $7.50 per PCB including shipping within the USA. Email me at admin (at) embedded-lab (dot) com if you want to get the PCB and any other parts required to assemble the board. I will receive payment through Paypal only. I will send you my Paypal ID after I get email from you. I have also listed the PCB on Tindie. Here’s the link: https://tindie.com/rajbex/io-experimenter-board-pcb/
Here’s the list of parts that are required to assemble the board.
I do have some extra parts to assemble the I/O board. I can provide a complete I/O Experimenter board kit (PCB+components) for $29.99. You will receive all the parts that are listed in the table above. The finished board will look like this. Note that the LCD display is not included in the kit. But you will receive a CR2032 battery, a MCP9701 temperature sensor, and a potentiometer knob as complimentary gifts with a kit.
Update (March 15, 2013)
This board has been corrected for the typo on the top silkscreen, and here is how the new board looks like. The access pins are also rearranged a little bit.