RaspberryPi Buffer Board

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To interface the RaspberryPi to the BigTrak motor controller and encoders it was decided to build a buffer board. The purpose of the buffer board is to protect the RaspberryPi from being over driven and also allows the RaspberryPi to drive outputs at a higher current level.


Schematic

The buffer board design is based on the Gertboard and consists of two SN74AC244N Octal Buffers. The board has 8 outputs and 7 inputs.

RaspberryPi Buffer Board RaspberryPi Buffer Board

Output Pinouts
J2 Pin Number Name RaspberryPi Name
1 3V3 3V3
2 0V 0V
3 Output 1 GPIO 0
4 Output 2 GPIO 1
5 Output 3 GPIO 4
6 Output 4 GPIO 17
7 Output 5 GPIO 18
8 Output 6 GPIO 21
9 Output 7 GPIO 22
10 Output 8 GPIO 23
Input Pinouts
J3 Pin Number Name RaspberryPi Name
1 Input 1 GPIO 24
2 Input 2 GPIO 10
3 Input 3 GPIO 9
4 Input 4 GPIO 25
5 Input 5 GPIO 11
6 Input 6 GPIO 8
7 Input 7 GPIO 7
8 N/C
9 N/C
10 N/C

References

  1. Gertboard Overview