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GY-63_MS5611/libraries/PCA9635
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README.md 2021-01-29 2021-01-29 12:31:58 +01:00

README.md

Arduino CI License: MIT GitHub release

PCA9635

Arduino library for PCA9635 I2C 8 bit PWM LED driver

Description

This library is to control the I2C PCA9635 PWM extender. The 16 channels are independently configurable is steps of 1/256. this allows for better than 1% finetuning of the duty-cycle of the PWM signal.

Interface

Constructor

  • PCA9635(deviceAddress, TwoWire *wire = &Wire) Constructor with I2C device address, and optional the Wire interface as parameter.
  • begin() initializes the library after startup. Mandatory.
  • begin(sda, scl) idem, ESP32 ESP8266 only. Library does not support multiple Wire instances (yet).
  • reset() resets the library to start up conditions.
  • isConnected() checks if address is available on I2C bus.

LedDriverMode

  • setLedDriverMode(channel, mode) mode is 0..3 See datasheet for full details.
  • getLedDriverMode(channel) returns the current mode of the channel.
LED mode Value Description
PCA9635_LEDOFF 0x00 led is 100% off, default @startup
PCA9635_LEDON 0x01 led is 100% on.
PCA9635_LEDPWM 0x02 set LED in PWM mode, 0..255
PCA9635_LEDGRPPWM 0x03 add LED to the GRPPWM*

* all leds in the group GRPPWM can be set to the same PWM value in one set. This is ideal to trigger e.g. multiple LEDS (servo's) at same time.

Read and write

  • write1(channel, value) writes a single 8 bit PWM value.
  • write3(channel, R, G, B) writes three consecutive PWM registers.
  • writeN(channel, array, count) write count consecutive PWM registers. May return PCA9635_ERR_WRITE if array has too many elements (including channel as offset)
  • writeMode(reg, mode) configuration of one of the two configuration registers. check datasheet for details.
  • readMode(reg) reads back the configured mode, useful to add or remove a single flag (bit masking)

Group PWM and frequency

  • setGroupPWM(uint8_t value) sets all channels that are part of the PWM group to value.
  • getGroupPWM() get the current PWM setting of the group.
  • setGroupFREQ(value) see datasheet for details.
  • getGroupFREQ() returns the freq of the PWM group.

Misc

  • lastError() returns PCA9635_OK if all is OK, and other error codes otherwise.
Error code Value Description
PCA9635_OK 0x00 Everything went well
PCA9635_ERROR 0xFF Generic error
PCA9635_ERR_WRITE 0xFE Tries to write more elements than PWM channels
PCA9635_ERR_CHAN 0xFD Channel out of range
PCA9635_ERR_MODE 0xFC Invalid mode
PCA9635_ERR_REG 0xFB Invalid register
PCA9635_ERR_I2C 0xFA PCA9635 I2C communication error

Operation

See examples