Sharp GP2D15 IR Sensor

[rhtank50]

I got my digital IR sensors in the mail the other day and tested them out using a DC power supply and tested the output with an oscilloscope. The output wasn't what I expected (data sheets showed a zero for no detection and a square wave pulse for detection). I got a negative spike .2 V long when nothing was detected and a zero output when something was detected. Will these outputs work when coding my bot?

Thanks for the help,

David

 

[Exo]

Little mistake : ignore

 

[ivancho]

Check your datasheet..... the output of this sensor is open collector.... so you are going to need a pull up resistor for your square wave.

Open Collector just means that the device is only able to provide with a ground connections when detecting, when no detecting the pin will be floating. By adding a 4.7K resitor between the outoput and +5V, you will be able to get a 1, when nothing is infront of the sensor and a 0 when there is something.



Links:
https://www.acroname.com/robotics/parts/R49-IR15.html
https://www.acroname.com/robotics/parts/SharpGP2D12-15.pdf
https://www.acroname.com/robotics/parts/sharp_guide.pdf


Ivancho

 

[falleafd]

GP2D15 are preset by the factory at 24cm +- 3cm( I don't remember exactly, check it). So the object can be found in this range. Out of this range, the is no object detected.