Let's Make Robots!

diode

Decorative lamps, very simple circuit, two smd leds one 15 omh resistor and 5V supply. Attached with hot glue Read more

ok i think i have a phototransitor... over 500 of them or diode

right i have recently found out that i have about 500 photodiodes or phototransistors. 
however i have never used these before and i dont really know what they do or how they work, could someone please explain what i can do with them and what use they are to me.

 

http://www.everlight.com/datasheets/PT204-6C_datasheet.pdf

 

 

 

Electricity Flow

A have a simple question, if I put a diode in a cable, would I be able to make electricity flow 1 way only? If not how could I do that?

:D

Our first 'robot' circuit: What is this Component?

We've been working on a lot of basic circuits, just trying to understand basic electronics.  Almost all of our components are salvaged from old electronics, so it has been slow going, but we are learning a lot!

Schottky diode bridge IC for L298N?

Hi all!

Noob question: I'm using the L298N dual full H-bridge to drive my robot's 4 motors, can someone please give me the name of a chip that contains schottky diodes in a bridge configuration, so I can use it on the outputs to block back EMF? Sparkfun does the same on their boards: http://www.sparkfun.com/datasheets/Robotics/ROB-09571-Serial%20Controlled%20Dual%20Motor%20Driver%20-%20v11.pdf

I know that there are such ICs since I recall a friend using a 16-pin DIP in a similar occasion, but I can't remember it's name. I think it started with "L".