pololuswitches
I am replacing my auxiliary light switch of my car.
on the switch assembly, it has a positive, negative, and ground.
I am replacing it with a pololu pushbutton power switch with an oem switch that is a momentary type.
Here is the switch: http://www.pololu.com/product/750/pictures
Positive to Vin
Negative to Vout
There are 4 grounds on this circuit board, so which one is the correct one to connect to the right ground?
Or am I completely wrong?
With no intention of being rude, it is highly likely that the problem is that you are not correctly following the available instructions, which appear to be of excellent quality and clarity. high quality. The documentation is far better than is provided for most products of this sort - and if you follow it closely you should have no problems IF your basic system is working OK.
Pololu provide Arduino Library for the Pololu QTR Reflectance Sensors which seems to be very complete in code and hardware descriptions. A lot of descriptive material is provided. It would SEEM that if you followed their instructins that it would work.
While at a glance I didn't see your code snippet on their page, the fact that some of the rather uniquely named variables are the same suggests you are using their code. Are you?
Are you using this set of instructions as the basis for what you are doing?
Please provide a circuit of EXACTLY what you are doing. A word picture often hides misunderstandings on the part of the writer.
Very good users guide - 9 page PDF
Note that there are two models of sensor available - the QTR-8RC module which output a pulse
and the QTR-8A module which outputs a DC level.
You say you have the ...RC module.
The code for RC & 8A modules is not interchangeable so double checking what you have would be wise.
The Polulu reflectance sensor:
8A model at left, RC model at right.
If I understand correctly, the NKK M2027 (On-On-(On) SP3T) should do what you want. Just connect the circuit to terminals 2 and 4.
Best Answer
The site you link to shows a picture of the breakout board. The lighter green patches are the copper traces connecting the silver contact pads. You can see that a large trace connects all four Gnd pins together, so you can use any one of them. The same goes for Vin and Vout: each pair of pins is connected together.