LEDC controls LED intensity and generates PWM signals. ESP32 SoCs offer 6 to 16 channels for independent waveform generation. Default clock source is XTAL (supported) or AUTO (unsupported)
PWM creates controllable digital waveforms using timer and comparators. PWM frequency is 1/T where T is period of each cycle. Resolution determines number of discrete duty cycle levels (1-16 bits)
LED has cathode (-) connected to GND and anode (+) for control. LED turns off when connected to GND, on when connected to VCC. Most LEDs require resistor between anode and VCC or cathode and GND
2N2222 is an NPN bipolar junction transistor used as a switch. Transistors work by allowing large current through collector with small base current. LED operates between 9V-14.8V at 15mA current
New module controls illuminated LEDs on GeForce GTX GPUs and SLI Bridge. Requires GeForce Experience 1.7 with drivers version 331.65 WHQL or later. Available for Windows Vista through Windows 8.1 with 1GB RAM
HC-05 Bluetooth module connects to Arduino via 4 middle pins. LED connected to Arduino pin 13 with 220-1K ohm resistor. Circuit requires solderless breadboard and basic components