https://github.com/qeteshpony/attiny_i2c_pwm

Arduino sketch that turns an ATtiny25/45/85 into a simple I2C PWM generator to control LEDs
https://github.com/qeteshpony/attiny_i2c_pwm

arduino attiny25 attiny45 attiny85 i2c pwm-controller pwm-generator

Last synced: 8 days ago
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Arduino sketch that turns an ATtiny25/45/85 into a simple I2C PWM generator to control LEDs

• Host: GitHub
• URL: https://github.com/qeteshpony/attiny_i2c_pwm
• Owner: Qeteshpony
• License: bsd-2-clause
• Created: 2024-10-11T17:28:57.000Z (2 months ago)
• Default Branch: main
• Last Pushed: 2024-10-11T17:32:00.000Z (2 months ago)
• Last Synced: 2024-12-08T01:01:13.294Z (15 days ago)
• Topics: arduino, attiny25, attiny45, attiny85, i2c, pwm-controller, pwm-generator
• Language: C++
• Homepage:
• Size: 1000 Bytes
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE-BSD-2-Clause

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README

        
# I2C PWM for ATtiny25/45/85

A very simple Arduino sketch that turns an ATtiny25/45/85 into a simple I2C PWM generator to control LEDs. 

Nothing fancy but it works if you, like me, have tons of ATtiny85s in your drawer but no dedicated pwm ICs...

I think the sketch is self explaining but in short:

The device listens on I2C Address 0x20

Register 0x10 can have its LSB set to 1 or 0 to turn the pwm on or off without losing the settings. All other bits are ignored.

Register 0x11 sets the duty cycle from 0 to 255

You will need [ATTinyCore](https://github.com/SpenceKonde/ATTinyCore) to make this work.