I have four LEDS (Red,Green,Blue,Yellow) and want to use charlieplexing to light them up. I'll use an Attiny13V which needs 1.8 to 5.5V. I think one CR2032 with 3V will be suffice for the µC. The forward voltages and current of the LEDs are:
Min Typ Max | Max (mA)
Red: 1.7 2.1 2.8 | 20
Green: 1.7 2.1 2.8 | 20
Yellow: 1.7 2.1 2.8 | 20
Blue: 2.9 3.3 3.6 | 10-20
Will I'm able to light the LEDs with the CR2032 and how can I find the right resistor values?