I'm working on my raspberry pi door bell and facing the electricity problems that is beyond my knowledge, please help
What I have: one AC wire from door bell, it's around 0V when Idle, then when someone press the door bell button, it increases to 5V AC
What I want to achieve: My RPi needs the 3.3V DC input to monitor the "Button Press" action, so my first thought was to get a relay or transformer to convert the 5V AC to 3.3V DC. So I brought one from amazon, something called Adjustable Power Module/Regulator, here's the link: http://www.amazon.com/gp/product/B0052YHXOA?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s01
What's my problem: well, it doesn't work, the multimeter shows 0 or a very low voltage (around 0.3V) from the DC output from that Module, so I guess that I was getting the wrong thing
I'm asking around to find out any idea or any solutions to convert my 5V AC to 3.3V DC, so I can connect to my RPi to continue the project
tks in advance and Merry Christmas to everyone!