ATtiny85: I2C and PWM at Same Time?

Other Hardware 3rd Party Boards
1

The ATtiny85 uses pins 5 and 6 for I2C and PWM. Does this mean that I can only do one or the other?

I'd like to use the ATtiny85 as an I2C master and have two PWM pins at the same time. Is it possible?

ATtiny45-85.png

2

Hi,

Depends how accurate you need the PWM to be - you could use software PWM on PB3 & PB4. What is at the end of your PWM signal?

Geoff

3

I need the brightness of the LEDs to correspond with certain values to give a visual indication of what they are without being connected to a computer, so they'll do some fading.

Thanks, software PWM seems to be the answer to this. 8)

4

You could use the Digispark core and get 3 PWM hardware pins:

Hardware&Software PWM
Introduction

The Digispark -based on the ATtiny85 microcontroller- has 4 built-in hardware PWM. Currently, only 3 of them are usable in the arduino environment:

Pin0
Pin1
Pin4

http://digistump.com/wiki/digispark/tricks

I have verified that this works. Trinket core will only give 2.

Ray