Thanks for the reply I currently don't have pull-ups in my wiring setup. Do you think this is the issue?Has anyone got this to work with/without pull-ups? I am beginning to think spending more time on this will be fruitless and I should look at other solutions...Assuming I wire in some pull-ups I assume from reading they need to be on each ss line but do they need to be on miso,mosi and sck as well?As miso mosi and sck are shared lines would I need a pull-up for each card reader for these lines or a single one for each of the shared lines?Thanks for your time
Thanks Lenny I am trying to work through what you have said so it sounds like you managed to get three working without the multiplexer? I might go down the same route...rather than using a multiplexer as I am not sure I fully understand the wiring for that So the wire I am using is 22awg copper wire I guess that might not be good enough?If I try and use cat5e it will come with four sets of twisted pair so 8 wires in total do you untwist the pairs and just use one wire per miso/mosi etc or do you need to keep the wires paired?I see you ran the cat5e cable as a kind of backbone and then wired off to each of the readers (if I understood correctly?) how did you connect the cat5e (backbone) to the readers? I think you ran another set of wires from the backbone to the readers so how did you connect these wires?Sorry for all the questions but trying to learn a bit and it's quite frustrating at times Thanks for your help it's greatly appreciated.