Raspberry Pi - I2C 32 Channel PWM / Servo Board


Raspberry Pi - I2C 32 Channel 12 bit PMW Servo Board




                                                    32 channel PWM / Servo

The PCA9685 is an I2C-bus controlled 16-channel LED controller optimized for LCD
Red/Green/Blue/Amber (RGBA) color backlighting applications. Each LED output has its
own 12-bit resolution (4096 steps) fixed frequency individual PWM controller that operates
at a programmable frequency from a typical of 40 Hz to 1000 Hz with a duty cycle that is
adjustable from 0 % to 100 % to allow the LED to be set to a specific brightness value.
All outputs are set to the same PWM frequency.

PCA9685 also has a built-in oscillator for the PWM control.
However, the frequency used for PWM control in the PCA9685 is adjustable from
about 40 Hz to 1000 Hz as compared to the typical 97.6 kHz frequency of the
PCA9635. This allows the use of PCA9685 with external power supply controllers. All
bits are set at the same frequency.

The PCA9685 has 4096 steps (12-bit PWM)            PCA9685 Data Sheet


1. J3 Mini USB 5V input for PWM V+                                    

    J2 2P Terminal Block 5V input for PWM V+

2. J1 Rs-Pi V2  GPIO output

3. U2 PCA9685 (PWM Port 0 ~ 15)

4. R4,R5,R6,R7R8,R9( for U2 Address select A0,A1,A2,A3,A4,A5)

5. U3 PCA9685 (PWM Port 0 ~ 15)

6. R10,R11,R12,R13,R14,R15( for U3 Address select A0,A1,A2,A3,A4,A5)

7.Red power-good V+ LED

8. 1.6A PolySwitch Fuse for V+ input protect.



                                 plug in Raspberry Pi with Servo motor




 in i2cdetect  you can found 2 device in system (40,41)


Support our Pi_Scratch software   Detail

(1) Servo Motor control

 2 Servo in  channel 0 & channel 7 
   Command "SE"+ "PWM (0-15)" + "a" +"angle"  for Address 41
    se7a10   --> channel 7 servo move 10 angle  address 41
    se7a-10  --> channel 7 servo move -10 angle address 41
    se0a10   --> channel 0 servo move 10 angle  address 41
    se0a-10  --> channel 0 servo move -10 angle  address 41


(2) PWM  LED output demo



         LED module (Blue, Green,Yellow,Red)


LED Scrolling  Command     PWMLED41S0E15D4True
PWMLED”Address” S[Start channel] E[End channel] D[Delay / Timing] [True/False]
Address 40, 41, 42, 43, 44 
Start channel & End channel   0 ~ 15    16 channel
D   1,2,3,4,5    (1 ~ 100) Delay Timing
LED Brightness control Command 
PWMLED “Address” “B” “0 ~ 1000“ 
 Stop command 




servo-40.py    servo-41.py    pwm


pwm-v2  for Raspberry Pi V2 board

User Manual


Package Content

  1x Rs-Pi I2C 9685-2  32 channel PWM / Servo board

1x manual 



Raspberry Pi



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