This is the PCA9685 develop by XMP semiconductor. The PCA9685 is an i2C / TWI bus controller capable of driving 16 channels PWM controller. Suitable for driving servos and LED. Each LED output has its own 12-bit resolution at 4096 steps fixed frequency individual Pulse with Modulation controller that runs on programmable frequency from 24Hz to 1526 Hz along with adjustable 0%~100% duty cycle that allows the attach device to be set to a specific pulse value. The PC9685 output can be off or on without PWM control or set as its individual pulse controller value. The output driver is programmable to either open-drain with 25mA current sink at 5v or totem pole with 25 mA sink, 10 mA source feature at 5 V. This device operates at 2.4v to 5.5v and the I/O are 5.5v tolerant. The components which is attach to this PCA9685 can be controlled via 5v internal or external driver and a minimum amount of discrete component for large current or higher voltage.
The PCA9685 is a fast-mode plus (Fm+) family. Fm+ devices offer higher frequency up to 1 MHz or more populated bus operation up to 4000 pF. The PCA9635 and PCA9685 almost similar features. Another feature of this device it is manage via i2C bus and can be address at the same time and allows you to group the device addressed at the same time in any combination. This device can be use in Servos, Small Bipe Robots Runs by Servos, RGB / RGBA LEDS, LED Displays, LCD Backlights, LED status information, and keypads backlights for cellphones. See datasheet for more details.
Required Components
- Arduino IDE | Atmel Studio
- Microcontroller – Arduino NANO, MINI, MEGA, UNO, LEO, DUE, ZERO, 101, MKR1000, FIO, NodeMCU, Teensy Board, TeensyDuino, ESP8266 12, 12E, ESP32, LinkItOne, ESP8266 NodeMCU, ESPDuino, ATMEGA328 16/12, ATMEGA32u4 16/8/ MHz, ESP8266, ATMEGA250 16 MHz, ATSAM3x8E, ATSAM21D, ATTINY85 16/8 MHz Note: The Diagram below is using NANO. (please refer to each MCU’s respective pin-outs)
- Steam Sensor, Water Vapor Sensor (see below diagram)
- Capacitors (See below required values)
- Resistors (See below required values)
- Solder Less Breadboard (Optional)
- Jumper Wire
- Prototyping Board
- HTSSOP / WQFN Sockets or Boards
- PCB board
Wiring Guide
Slave Address: | 1 > Fixed |
Selectable: | A5 | A4 | A3 | A2 | A1 | A0 |
Sketch Code For LED
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#include <Wire.h> #include <PCA9685.h> PCA9685 ledDriver; void setup() { Serial.begin(9600); // Set Serial Communication Serial.print("14CORE | PCA9685 Test Code "); delay(4000); Serial.print("Reading Value from PCA9685"); Delay(4000); Wire.begin(); // Set Arduino Wire Started ledDriver.begin(B111000); // Set the pin address A0 to A5 to B111000 ledDriver.init(); } void loop() { /* the setLEDDimmed un able to use in a loop to give you a pleasant Pulse up of the LED. Because each time you set a level for a LED it will calculate random timing intervals for the PWM function at the chip This is implemented in order to distribute a current consumptions of the full time period. */ for(int level=5;level>=0;level--) { for(int i=0; i<16; i++) { ledDriver.setLEDDimmed(i,level*20); delay(100); } } for(int level=0;level<=5;level++) { for(int i=0; i<16; i++) { ledDriver.setLEDDimmed(i,level*20); delay(100); } } } |
Sketch Code For Servos
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#include <Wire.h> #include <Adafruit_PWMServoDriver.h> //You can download this library below Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver(); //set default address 0x40 #if defined(ARDUINO_ARCH_SAMD) // for Zero, output on USB Serial console, remove line below if using programming port to program the Zero! #define Serial SerialUSB #endif void setup() { #ifdef ESP8266 Wire.pins(2, 14); // Set if your using ESP8266 can use any two pins > SDA to #2 and SCL to #14 #endif Serial.begin(9600); Serial.print("14CORE | PCA9685 Test Code "); delay(4000); pwm.begin(); pwm.setPWMFreq(1600); // Set This is the maximum PWM frequency // if you want to really speed stuff up, you can go into 'fast 400khz I2C' mode // Note some i2c devices dont like this so much so if you're sharing the bus #ifdef TWBR // Set save I2C bitrate uint8_t twbrbackup = TWBR; // must be changed after calling Wire.begin() (inside pwm.begin()) TWBR = 12; // upgrade to 400KHz! #endif } void loop() { // Drive each PWM in a 'wave' for (uint16_t i=0; i<4096; i += 8) { #ifdef ESP8266 yield(); #endif for (uint8_t pwmnum=0; pwmnum < 16; pwmnum++) { pwm.setPWM(pwmnum, 0, (i + (4096/16)*pwmnum) % 4096 ); } } } |
i2C Address Finder / Scanner
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/* i2C Address Scanner */ #include <Wire.h> #include <PCA9685.h> template<class T> inline Print &operator <<(Print &obj, T arg) { obj.print(arg); return obj; } PCA9685 ledDriver; void setup() { Serial.begin(9600); // set up serial Serial << F("\n- - - - - - - -\nSerial Started\n"); Wire.begin(); // Wire must be started! } void loop() { Serial << "\n"; for(uint8_t i=0;i<=63;i++) { // Set up each board: ledDriver.begin(i); // Address pins A5-A0 set to B111000 if (ledDriver.init()) { Serial << "\nBoard #" << i << " found\n"; } else { Serial << "."; } delay(10); } } |
Downloads
- PC9685 Datasheet / User Guide
- Download PC9685 Arduino Code Library for LED | Zip
- Download PC9685 Arduino Code Library for Servo | Zip
