Timeline for How to wire an analog IR sensor for digital input?
Current License: CC BY-SA 3.0
22 events
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| Mar 8, 2018 at 2:22 | answer | added | JoeSz | timeline score: 1 | |
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| Sep 9, 2017 at 16:22 | history | tweeted | twitter.com/StackArduino/status/906553402200600577 | ||
| Sep 8, 2017 at 16:28 | history | edited | dda | CC BY-SA 3.0 |
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| Apr 11, 2017 at 7:56 | answer | added | user32572 | timeline score: 0 | |
| Dec 28, 2015 at 8:04 | comment | added | dlu | @Gerben, I'm puzzled by this. The input impedance of most modern meters is quite high, mine is rated at '> 10 MΩ' I would think that that should make little or no difference to the voltages in this circuit. Or am I missing something? | |
| Dec 25, 2015 at 13:52 | comment | added | Gerben | Multimeters will affect the voltage a bit. Especially if you are using such high value resistors. Better connect directly to the arduino, and have the arduino light an led, if it reads high. I'd add a potentiometer, so you can trim the values. Also, not every input has the same 2.4V "tipping point". (I'd experiment with a lower value for R1, and remove R2.) | |
| Dec 25, 2015 at 4:29 | comment | added | Cerin | @Marla, Yes, that would be too complicated. | |
| Dec 25, 2015 at 3:48 | comment | added | Cerin | @jwpat7, When you're only talking about two colors, as in my case, then yes, it's very much a color sensor, and many people successfully use it for this purpose. You see the color black because a black material doesn't reflect most wavelengths... And no, a different pullup does nothing. | |
| Dec 25, 2015 at 3:11 | comment | added | James Waldby - jwpat7 | Per datasheet, the QRD1113 / QRD1114 is a "Reflective Object Sensor", not a color sensor. If the sensor does its job properly, you will get about the same signal for a black object as for a white object. That said, what happens if you add an external 5KΩ – 15KΩ pullup in place of the internal pulllup? You might also try a bridge arrangement | |
| Dec 25, 2015 at 3:04 | comment | added | Marla | Would you consider using a comparator (op amp) too complicated? | |
| Dec 25, 2015 at 2:43 | history | asked | Cerin | CC BY-SA 3.0 |