The code switches the LEDs on and off randomly for a flickering effect and is based on this instructable. ... My whole circuit is 2 resistors, 2 LEDs, the phototransistor and the ATTINY45.

This is a simple flashing led circuit with 2 leds and 2 NPN transistors. It illustrates the behavior of transistors and capacitors and if you use an. Aspencore network. News & Analytics ... The switch ...

If you use a standard bulb it behaves as the "medium" circuit, so you get the off-off-on-on behavior. You can get 3-way LED bulbs that have two independent circuits, but they cost more.

A switch is a device that opens or closes circuits. When a switch is in the 'off' position, ... The other is called a 'parallel circuit'. The two LEDs in this picture are connected in SERIES.