IR distance sensor GP2Y0A21YK0F Voltage to range?

[samson241]

Does anyone know how to convert this?
http://www.adafruit.com/products/164

[joan]

You're out of luck I'm afraid. The Pi only has digital gpios. You need to read that from a device with at least some analogue gpios.

[PiGraham]

As Joan says, the Pi only has digital interfaces on board.

This sensor outputs 0.3V to 3V so you could use it as a fixed distance sensor that would change a digital input 0 - 1 at some distance 10cm - 80cm.

The alternatives is to use a ADC add on and read the analogue voltage. Perhaps something like this:
http://www.abelectronics.co.uk/products ... -converter

Here is a blog post on using the Sharp IR sensors with a Pi.
http://davstott.me.uk/index.php/2013/06 ... -infrared/

[joan]

...
This sensor outputs 0.3V to 3V so you could use it as a fixed distance sensor that would change a digital input 0 - 1 at some distance 10cm - 80cm.
...

I have a GP2D12 (I think it's the same device).

I hooked it up to the Pi (5V, GND, gpio4). It gives logic 1 at about 12 cms and closer.

[samson241]

...
This sensor outputs 0.3V to 3V so you could use it as a fixed distance sensor that would change a digital input 0 - 1 at some distance 10cm - 80cm.
...

I have a GP2D12 (I think it's the same device).

I hooked it up to the Pi (5V, GND, gpio4). It gives logic 1 at about 12 cms and closer.

Thanks for the help, but this is irrelevant. I have Arduino piping the analog number to pi through the piserial into python. Does anyone know the equation that will decode it from analog to range?
sorry... my fault for not including info...

[joan]

PiGraham posted a blog link which gives that information.

[samson241]

PiGraham posted a blog link which gives that information.

oh thanks... missed that... right now I'm using the digital which works fine