Infra-red

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$2.35  
4 pc(s)
A simple breakout PCB for the GP1A57HR photo interrupter. This PCB has three connections for PWR, GND, and Signal. When the gate is clear, SIG will be high (>4.9V). When the gate is blocked by a finger, writing utensil, food pellet, or anything else - SIG will go low (<0.4V)....

$12.00  
23 pc(s)
This popular sensor made by Sharp produces an analog output that varies from 3.1V at 4cm to 0.3V at 30cm. The sensor has a Japanese Solderless Terminal (JST) Connector. You can purchase a pre-made cable with connector that mates with this sensor. See 3-pin Cable for Sharp Sensors...

$12.70  
2 pc(s)
This popular sensor made by Sharp produces an analog output that varies from 3.1V at 10cm to 0.3V at 80cm. The sensor has a Japanese Solderless Terminal (JST) Connector. You can purchase a pre-made cable with connector that mates with this sensor - see 3-pin cable for Sharp Sensors...

$16.80  
5 pc(s)
This popular sensor made by Sharp produces an analog output that varies from 2.5V at 20cm to 0.4V at 150cm. The sensor has a Japanese Solderless Terminal (JST) Connector. You can purchase a pre-made cable with connector that mates with this sensor. See 3-pin Cable for Sharp Sensors...
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