Lessons Learned - LEDs

A project log for Beeping, Blinking Business-card Badge (B4)

Second generation of the NFC business card adding audible feedback

greggreg 02/27/2021 at 02:590 Comments

In this upgrade from my B3 Blinking Business card Badge, I upgraded the LED to RGB since I figured I would be able to change the color, but I forgot to check the harvested voltage, so the only one you can see when powered by NFC is the red LED.  The 1.8V generated inside the LPC8N04 will not turn on the blue or green.  In my next project I will add a capacitor and schottky diode so I can double the voltage by toggling an I/O.