https://github.com/robvanlopik/pca9685-pwmexpander

PharoTings code for the PCA9685 I2C PWM expander
https://github.com/robvanlopik/pca9685-pwmexpander

pharo

Last synced: 2 days ago
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PharoTings code for the PCA9685 I2C PWM expander

• Host: GitHub
• URL: https://github.com/robvanlopik/pca9685-pwmexpander
• Owner: robvanlopik
• License: mit
• Created: 2020-04-15T13:03:57.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2020-05-10T13:01:13.000Z (over 4 years ago)
• Last Synced: 2024-11-22T07:25:35.247Z (2 months ago)
• Topics: pharo
• Language: Smalltalk
• Size: 18.6 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# PCA9685-PWMExpander

PharoTings code for the PCA9685 I2C PWM expander

I am the driver for the PCA9685 16 port PWM/Servo extender.

I am controlled through the I2C bus. There can be 62 of me on the bus. 

You can change my frequency  (30 - 3000 Hz) and on/off ratio. 

I start in sleep mode.

 

The internal clock is nominally 25 MHz. If you need more precise timing, you can alter this for use in the internal calculations (>>adjustedClockFrequency:).

Pin numbers run from 0 to 15, because that is what is used in the datasheet and also on the print.

Main methods:

>>wakeUp - start from sleep.

>>frequency: - frequency. Typically 50 Hz for driving servo motors, or up to 3000 Hz for LEDs.

>>pwmForPin:  microSeconds: - on-time, used for servos in range 500 - 2500.

>>pwmForPin:  percentage: - percentage on-time .

>>pinOn: and pinOff: - to turn a pin fully ON or OFF.