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Step 4Making the sensor
Solder a button cell to the SPDT switch lever.
Make the nail head hot on a flame and put it on the plastic sheet on the motor in a position that when the robot stands vertically the button cell touches the ground.
Then attach the switch to the robot with glue.
Make the nail head hot on a flame and put it on the plastic sheet on the motor in a position that when the robot stands vertically the button cell touches the ground.
Then attach the switch to the robot with glue.
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