RoverBot

built by Nic H.

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Target Environment Locomotion Method
Indoors 2 Wheels
Sensors / Input Devices Actuators / Output Devices
2 Lego buttons
Wiskers
2 Lego DC motors
Control Method Power Source
Autonomous Battery
CPU Type Operating System
Discrete components None
Programming Lanuage Weight
None N/A
Time to build Cost to build
3 days Nothing - I had all the parts
URL for more information
N/A
Comments
One problem I had was making object detection work. The first thing I tried was using an Infra Red LED and an IR sensor. I was going to make a circuit which would make the robot back up and turn when a reflection was sensed, but house lights messed it up because they let out Infra-Red light. Next I made lego whiskers. I have one circuit for each wheel which, when the input is connected to +, will change the direction of the wheel for a few seconds, and then change it back to its origonal direction. The amount of time each wheel reverses is different. This makes it so at first, when they were both spinning backwards, the robot backs up. When the wheel which reverses for the shorter amount of time starts spinning forwards again, the robot turns. After about a second, the other wheel starts spinning forwards, and the robot drives forwards again. I made the lego whiskers, and then connected them to each other, so it didn't matter which one was pressed. Then I connected them to the inputs of the circuits controlling the wheels and also to +. I turned it on and pressed a whisker, and both wheels started going backwards. So far, so good. But then, both wheels started going forwards again. They were supposed to do that at different times. I found out what the problem was. It was that connecting both circuits to the whiskers had also connected them to each other. After trying a couple things, I found out that all I needed was a couple of diodes to make it so the circuits didn't affect each other.

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