Using a Transistor to Control an LED or anything

For my LCC project I decided to use a 2N4401 NPN transistor to control status LEDs and AC Switches. I did this so that the power draw from the Arduino chip would be as low as possible.

Below is a diagram of how this works. I used a 2N4401 NPN transistor that “turns on” when the gate goes high or positive. This essentially allows it to switch the negative or ground leg of the circuit. I did this because the Arduino can’t turn a digital IO line to ground- just 0v or 5v. Continue reading “Using a Transistor to Control an LED or anything”

Lizard Climate Control

The background for the project is simple, the mission- not necessarily so.

New Baby Bearded Dragon. Gotta have heat and light, on a schedule and deal with over/under heating conditions. I could fork over $60+ for a ready to go solution or I could make my own.

Guess which I went for? Arduino to the rescue!

Keep watching for pics, code and schematics as I build it. Basic requirements are here.

Bearded Dragon Collage