RPI-MDI
Contents
Raspberry Pi Servo Card
Features
- Raspberry Pi daughtercard
- Fits on "old" Model B or "new" Model B Plus board
- Three axis Servo PWM outputs (Servos not included)
- Two PWM Controlled LEDs
- I2C controlled 16-channel PWM controller PCA9685
- 5 channels used as above (Three Servo outputs, 2 LED outputs)
- PWM controller has internal built-in clock generator - no refresh required
- Even though the Raspberry Pi has 3.3V I/O, the PWM outputs run at 5V - compatible with typical servos
- Three switch inputs with on-board pull-ups which can be used as GPIO lines
- 3X of 10 uF SMT capacitors on rear of board for PWM/Servo noise reduction
- Right angle connectors for Low Profile
- Recessed connectors for side connectors for smallest form factor
- Very small size 1.4" x 1"
- Jumper to use 5V from Raspberry Pi (if your power supply has sufficient capacity) or pads for external power or additional capacitance if needed
- Python PWM - Adafruit driver
PCA9685 Block Diagram
Connectors
J1 - Servo Output 1 - PWM_LED0 pin on IC J2 - Servo Output 2 - PWM_LED6 pin on IC J3 - Servo Output 3 - PWM_LED7 pin on IC J4 - Switch Input 1 - GPIO_25 J5 - Switch Input 2 - GPIO_4 J6 - Switch Input 3 - GPIO_22 Power/capacitance connector Marking is nearest pin 1 Pin 1 is a square pin J1 - Servo Output 1 - PWM_LED0 pin on IC J1-1 = GND J1-2 = VCC (+5V) J1-3 = PWM output line J2 - Servo Output 2 - PWM_LED6 pin on IC J2-1 = GND J2-2 = VCC (+5V) J2-3 = PWM output line J3 - Servo Output 3 - PWM_LED7 pin on IC J3-1 = GND J3-2 = VCC (+5V) J3-3 = PWM output line J4 - Switch Input 1 - GPIO_25 J4-1 = GPIO_25 J4-2 = GND J5 - Switch Input 2 - GPIO_4 J5-1 = GPIO_4 J5-2 = GND J6 - Switch Input 3 - GPIO_22 J6-1 = GPIO_22 J6-2 = GND Power/capacitance connector This is a three pin L shaped connector located in the following corner of the board.
RPI-MDI-ExtDC-Pads.png
Pin 1 = Ground Pin 2 = Servo +5V Pin 3 = +5V-Raspberry Pi
Schematic
Drivers/Example Code
- Github repo - Driver code
