RE: Pas Home / Home ventilation with RPiSoC

hlipka — Mon, 01 Sep 2014 07:35:37 GMT

What you measure for the switch looks like a normal input with a pull-up resistors. You should be able to control that with a transistor (or a small relay if you want to have isolation).

Are the switches on the panel mechanical?

RE: Pas Home / Home ventilation with RPiSoC

mcb1 — Mon, 01 Sep 2014 01:46:08 GMT

But how measure voltage with range 0v-10v? Use a Voltage Dividers?

It seems that the inputs are are 3v3 so you'll need to use a 2:1 ratio on your resistors.

ie a 10K and 4k7 across the 0-10v will give 0-3v2 at the junction of the two resistors.

Sparkfun has a tutorial including a handy calculator

https://learn.sparkfun.com/tutorials/voltage-dividers

There is another calculator here.

http://www.raltron.com/cust/tools/voltage_divider.asp

RPISoC info and examples

http://embeditelectronics.github.io/psoc_2_pi/examples.html#voltmeter-using-the-16-bit-delta-sigma-adc

The documentation seems to be all here.

http://www.cypress.com/psoccreator/

and the ADC you require

http://www.cypress.com/?docID=45831

Mark