Hobbit
Pi Droid Alpha has a LOT of three pin servo-style connectors, a 26 pin GPIO header, and four dual-screw terminals.
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It can seem pretty confusing at first – so I will explain what they do.
Servo Pin Functions
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Jumpers select between Pi 5V and VServo For Servo1-4 and Servo5-8.
| For each Servo pin | Function |
| SIP Resistor | 9 pins |
| Resistor | forms voltage divider |
| Servo SIG pin | 5V input/output |
| Servo VCC pin | 5V/VBat power |
| Servo GND pin | Ground |
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If you are using the motor driver on Pi Droid Alpha, Servo 7 & 8 are used to control the motors.
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You can see the servo cable running from the servo to the first servo connector on Pi Droid Alpha above.
DIO A0-A7 and B0-B7 Digital I/O Pin Functions
For DIO A0-A7 and B0-B7 VCC is 5V from the Pi. For more details, please see the Pi Droid Alpha User Manual, available on the product page:
https://www.mikronauts.com/raspberry-pi/pi-droid-alpha/
| For each DIO pin | Function |
| DIO SIG pin | 5V input/output |
| DIO VCC pin | 5V power |
| DIO GND pin | Ground |
If you are using the L293D motor driver on Pi Droid Alpha, DIO A4-A7 are used to control Motor 1 and 2 direction as follows:
DIO A4 = Motor 1, DirA
DIO A5 = Motor 1, DirB
DIO A6 = Motor 2, DirA
DIO A7 = Motor 2, DirB
Note you can only control a maximum of six servos when you use the motor driver, or eight when you do not use it – if you need more than 6-8 servos, you are better off going with a RoboPi controller, which can control up to 24 servos – but does not have a motor driver on-board.
