PIFACERELAYPLUS

Is this of any use?

Welcome to PiFace Relay Plus’s documentation! — PiFace Relay Plus 0.2.2 documentation

Hi Paul, thanks for your prompt reply, I have seen and looked through the document that you mentioned but I can't see where it gives any info about how to access the GPIO pins on the Pifacerelay+

I must admit I am quite new to this so the language used may not be as I expected  so I am missing the point.

Just a simple way to get a switch to turn on a relay is all I need for now.

Thanks

There is a section in the linked document called 'Basic Usage'

Examples — PiFace Relay Plus 0.2.2 documentation

There is also a page on here dedicated to the PiFace Relay Plus:

http://www.element14.com/community/docs/DOC-70583/l/piface-relay-plus-for-raspberry-pi-model-b-plus

And contained in that page is a PDF getting started guide:

Getting Started - PiFace Relay+ interface board for Raspberry Pi

Hi Paul, I very much appreciate you taking the trouble to try to help me.

I have printed off the Getting started and have managed to run, successfully, the Testing" and the example Python program these both test and use the relays.

I have also saved and tried to work through the PDF doc you mention, again working with the relays is no problem, but getting to grips with the input side has me stumped so far.

Before purchasing the Pifacerelay+  I had got to grips with the basics of the GPIO on the Pi and had made some simple circuits using a LED, switch and "Pull up resistor)

In the tech spec of the Pifacerelay+ it mentions 4 GPIOs with switchable pullups, its this part which has me stumped.

If you can't help can you make any suggestions where else I might look.

Thanks

Garry

Yes it is what I am referring too.

I am starting to wonder if I have purchased the wrong board, maybe I need something else.

If you are able to help it would be appreciated.

Okay now I feel like an idiot, I thought the PiFace Relay+ was a EXTRA but it's the actual board.

import pifacerelayplus

pfr = pifacerelayplus.PiFaceRelayPlus(pifacerelayplus.RELAY)

pfr.x_pins[0].value <--- The gpio pins are the x pins and are numbered [0] threw [3], this gets the pins value.

The documentation says that when connected to ground the pin value will be 1.

bin(pfr.x_port.value) <--- The internet says that this will turn on the fourth pin.

I don't know why the fourth pin but I'm guessing that something like bin(pfr.x_port[0].value) would turn on the first pin.

I will post more if I find more, hope this helps and sorry for the confusion.

Thanks for your help so far.

I'm still not clear how I connect an input, say a switch or what ever.

Garry

I would connect a gpio pin to a switch that would split off and have one side go to ground. Then have the program compare the value of pfr.x_pins[0].value with 1 and if the result is true the switch is on, if the result is false the switch is off.

isn't the piface relay board triggered by the default rpi gpio pins?  they can be controlled with rip.gpio from python3 or with gordons wiring pi from bash or any shell for that matter.

https://pypi.python.org/pypi/RPi.GPIO

https://projects.drogon.net/raspberry-pi/gpio-examples/tux-crossing/gpio-examples-1-a-single-led/