As of revision 2 boards, there is space to add some header pins to get access to eight more GPIO pins. These are found on the Header 5. Highlighted below.
Here are their functions;
- P5-Pin1 – 5v0
- P5-Pin2 – 3.3v
- P5-Pin3 – GPIO28
- P5-Pin4 – GPIO30
- P5-Pin5 – GPIO29
- P5-Pin6 – GPIO31
- P5-Pin7 – GND
- P5-Pin8 – GND
I needed some more pins for PiBBOT as I want to change my TFT to a character OLED which needed more pins then I had spare, so I decided to make use of these extra pins.
Here are the results, I soldered the head onto the underside of the Pi so I could plug in an IDC cable.
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Thanks for the info… I was wondering what was the holes on the Rpi
Did you use these exclusively for the display? Or did the display require more GPIO pins? I’m curious because I am trying to attach an adafruit TFT display to my Raspberry Pi, and don’t have the budget to buy it if it wont work.
Nope, I used these for another project to control some motors.
What Adafruit TFT are you trying to use?
I just ordered the “2.2” 18-bit color TFT LCD display with microSD card breakout – ILI9340″ from adafruit. Here is the url: http://www.adafruit.com/products/1480
I can only see 4 more (not 8) GPIO pins, namely access to GPIO28, 29, 30, 31..
Am I missing something?
8 also includes 2 x GND, 5V and 3.3v
Is it possible to connect 100 IR sensors to single PI ? Is there any alternative Raspberry Pi in order to connect N IR sensors
You could use a keyboard matrix, 10×10