Line-following robots have difficulty tracking masking tape when the robot employs infrared LEDs and sensors. It seems most masking tape is to some extent transparent to infrared, thus the background "color" bleeds through and the robot can't see the line.
To avoid that problem, two pairs of ordinary photoresistors can be used. Also called photocells, they're able to see visible light in the same ranges as the human eye. So, if you can see the line, hopefully the robot can too.
Photoresistors react quite slowly however , which could hamper a robot that's driving around on a fast track.
To avoid that problem, two pairs of ordinary photoresistors can be used. Also called photocells, they're able to see visible light in the same ranges as the human eye. So, if you can see the line, hopefully the robot can too.
Photoresistors react quite slowly however , which could hamper a robot that's driving around on a fast track.
Below an example of the sensors plus LED.
sourced from: http://www.robotroom.com
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