Hi, I'm quite new to arduino and would like to know how to use the voltmeter to test if I have soldered the connections on the module properly. I often have hardware problems and this will really help me zone in on which connection is badly done and allow me to better troubleshoot the issue. Your help is much appreciated.
e.g. For an RFID reader, do I test the each of the pins to ground and what reading should I expect to see on the voltmeter ?