RGB LED - Common Cathode - 1 Analog Input - Functionally Driven Test - RB Variant - Low Power

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01:21:13

Allows a 4 pin common cathode RGB LED to be controlled via a single Analog in (and a 5V mains). This is feasible because there are constrained color targets:

0.0 V = Blue
5.0 V = Red

The bottom voltage source is a GPIO pin. An AC voltage source is used to simulate the range of possible voltages achievable with PWM.

Draws only about 5 mA approximately.

NOTE: A low power alternative to ( http://everycircuit.com/circuit/6071253994045440 ).

NOTE 2: Physical testing has been completed.  The circuit only draws or sinks around 8mA at any point in its operation. Additionally, this lower power design reduces the sinking of amperes into the GPIO pin to the point that risk of frying the DigiSpark microcontroller is mitigated.

published 10 years ago

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