Hi Guys!
Finally I finished the first semester of the NTB in Buchs.
Beside working for my company I had to learn a lot – but – I also had some time to combine the requirements for the “robot” project in the first year with a possible nice feature for the Mikrokopter.
I’m talking about the “traditional” IR (infrared) distance sensors from Sharp. There are different types of them, for example: GP2D12, GP2D120, GP2Y0A02YK (GP2Y0A02)
These three types are sensors that have an analog output (there are also other sensor-types from sharp with adjustable or fixed digital outputs)
The sensors have a very simple interface:
- Power Supply
- GND
- Analog Out
That’s it!
The difference of these three types that I tested is the measuring distance or let me say their “sensitivity”.
For example the GP2D12 specification is:
Range: 8cm to 80 cm
Supply: 5,0V;
Vout: 0,4V bis 2,6V typ. (80cm – 10cm);
Current: 33mA typ.
Typical feedback:
As you can see the output voltage is not linear to the distance – but that is not a big problem for the softare, if you know that behaviour 
The GP2D120 if from 4cm to 30cm and the GP2Y0A02YK is from 20cm to 150cm.
