Let's Make Robots!

Robots without brains

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To be honest, I just did a quick run-through of the schematics they show... It seems that one is a digital output while the other is an analog output.

dont understand what is meant by low-high and high-low state. some1 explain that clearly =)


thank you 

Do you want the sensor to give you a high voltage when it detects a bright surface, or when it detects a dark surface. Create one of the sugested circuits. Take the one that looks the easiest to build for you. Then use  Volt meter to check what you buit. No need for micro controller. Safer for everybody.