РОБОТ ТЕНСТАР 16-канальный 12-битный PWM / Серво Драйвер-I2C интерфейс модуля PCA9685 Raspberry pi щит Серво на.

Instructions for 16-channel PWM servo driver board (PCA9685)

Overview

It is not difficult to drive the servo with the Arduino library. If you need to drive a lot of motors, you need to occupy more pins, which will also affect the Arduino's processing power. The special servo driver board solves this problem well.

This servo driver board uses the PCA9685 chip, which is a 16-channel 12-bit PWM servo driver, which can drive 16 servos through 2 pins through I2C. Not only that, you can also cascade up to 62 driver boards by cascading, which can drive a total of 992 servos!

Driver board connected with Arduino

This PWM driver board uses I2C mode, so only 4 wires are needed to connect to the Arduino device:

"Classic" Arduino pin method: + 5v-> VCC GND-> GND Analog 4-> SDA Analog 5-> SCL Old Mega pin method: + 5v-> VCC GND-> GND Digital 20-> SDA Digital 21-> SCL R3 and later Arduino pin method (Uno, Mega & Leonardo): (These boards have dedicated SDA and SCL pins) + 5v-> VCC GND-> GND SDA-> SDA SCL-> SCL

The VCC pin only supplies power to the chip. If you want to connect the servo or LED lights, use the V + pin to supply power. The V + pin supports a 3.3 ~ 6V power supply (5V when the chip is at a safe voltage). We recommend to supply power through an external power supply terminal.

Power supply part

The design voltage of most servos is 5 ~ 6V, especially when multiple servos are running at the same time, a high-power power supply is required. If you directly use the Arduino 5V pin to directly supply power to the servo, some unpredictable problems will occur, so we recommend that you can have a suitable external power supply for the driver board.

Connect the servo

Most servos are connected using standard 3-wire female plugs, as long as they are inserted into the driver board according to the corresponding pins. (The ground wire is generally black or brown, and the signal wire is generally yellow or white)

Up to 16 servos can be added on one driver board.

Drive board cascade

Multi-drive board cascade (up to 62 cascades) can provide you with greater scalability, the connection method is shown in the following figure.

Assign an address to the driver board

Each driver board in the cascade needs to have a unique access address. The initial I2C address of each driver board is 0 × 40, and the I2C address can be modified by the jumper in the upper right corner. Connect a jumper with solder to indicate a binary number "1".

Board 0: Address = 0 × 40 Offset = binary 00000 (default) Board 1: Address = 0 × 41 Offset = binary 00001 (As shown above, connect A0) Board 2: Address = 0 × 42 Offset = binary 00010 (connect A1) Board 3: Address = 0 × 43 Offset = binary 00011 (connect A0 and A1) Board 4: Address = 0 × 44 Offset = binary 00100 (connect A2) And so on. . . Code example: #include #include   Adafruit_PWMServoDriver pwm1 = Adafruit_PWMServoDriver (0 × 40); Adafruit_PWMServoDriver pwm2 = Adafruit_PWMServoDriver (0 × 41);   void setup () {    Serial.begin (9600);    Serial.println ("16 channel PWM test! ”);      pwm1.begin ();    pwm1.setPWMFreq (1600); // This is the maximum PWM frequency      pwm2.begin ();    pwm2.setPWMFreq (1600); // This is the maximum PWM frequency }