12V relay shields

Other Hardware General Electronics
1

Hi everyone :slight_smile:

I'm a bit of a noob when it comes to electronics, and I was wondering - can something like the relay shield in the link below on ebay be used in 'reverse'? e.g. if current from switching on a higher voltage circuit trips the relay, can I use it to input to my sketch?

http://www.ebay.com.au/itm/4-Channels-12V-Relay-Module-Arduino-ARM-PIC-AVR-DSP-SRD-12VDC-SL-C-/300668995528?_trksid=p5197.m1992&_trkparms=aid%3D111000%26algo%3DREC.CURRENT%26ao%3D1%26asc%3D14%26meid%3D6853115087281650298%26pid%3D100015%26prg%3D1006%26rk%3D1%26sd%3D300668995528%26#ht_3424wt_1163

Thanks all!

2

Practically, not. Search for shield specially design to work in reverse. Usually, voltage monitoring systems

3

great - thanks for your help!