modified 10 years ago

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

00:30:25

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.

NOTE: Given my previous struggles in getting the green LED to light (see http://everycircuit.com/circuit/6552346996244480 ) I modified the circuit to utilize only two LEDs (since only blue and red are required for my purposes). A physical implementation of this has not yet been attempted but it shall also use the 2N3906 Transistors and the same common cathode RGB LED (operating voltages: 2V, 3.2V, 3.2V). 

published 10 years ago

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