I am doing this project, and I find some problem on the push button wire connection as the SCHEMATICS is not clearly shown. which pin should I connected? I just bought a 5-pin(5V) push button on a Taobao shop. I found most of the tutorial are not 5 pins.Thanks a lot.
link for Taobao:
https://item.taobao.com/item.htm?spm=a1z09.2.0.0.26f22e8d5tvVJZ&id=528951550062&_u=12i94evj6ea1
Look at the diagram on the Taobao page.
C (common), NO (normally open), and NC (normally closed) are most likely the switch contacts.
Use C and NO if you want to use the switch as a normal push button (contacts close when pushed).
Use C and NC if you want a contact to open when the switch is pushed (less common).
The (+) and (-) are probably the contacts for the LED.
Voltage needed depends on which type of switch you have bought.
Leo..
Use your multimeter if not sure.
Set it to resistance and you can very quickly find out what is connected to what.
I am new to Arduino, can you say in details? thanks you two
Set your multimeter to resistance, connect two wires of your button to the probe, see what happens. Press it, see what happens. If you have the LED, nothing will happen - switch the leads and the LED should glow (at least that's what happens with my multimeter which produces a few mA at the x10 setting). That's how it's done.
That has nothing to do with Arduino, just basic electricity. Make sure you understand electrical circuits first: switches, LEDs, diodes, transistors, resistors, capacitors, etc. When you understand those things it's time to move on to microcontrollers.