描述
28. 樹莓派 Raspberry Pi I2C 32 PWM 擴充模組
32 channel PWM / Servo
一、PCA9685簡介
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
二、產品特色
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, R7, R8, 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.
三、plug in Raspberry Pi with Servo motor
四、in I2C detect you can found 2 device in system (40,41)
五、Scratch驅動應用範例 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 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“
PWMLED41B1000
Stop command
“PWMLED41STOP”
六、範例程式下載
pwm-v2 for Raspberry Pi V2 board
七、產品內容
1x Rs-Pi I2C 9685-2 32 channel PWM / Servo board
1x Manual
商品評價
目前沒有評價。