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behinde the minimum normal range would be 20 cm, thats far to put stuff there as it would be outside the robot body
like if the sensor is all the way up front have the line be at the back of the robot, so it find the line and then turns 180 to face forward.
The sharp ir should stick out from the servo slightly at the sides when its pointed forwards, all you need to do is point the emitter detector pair straight up and it will register whenever the sharp ir is pointing forwards.
1/isnt it better to connect a resistor between vcc and motor? (i dont need much torque as its only a scanner)
2/can i power it with less than 12volts? what would happen if i power it with 6v ?3/how much delay should i include between steps?