ESP8266 Community Forum

My ultimate goal is to make an IoT device that attaches to my washer or dryer and senses the vibration and sends me a text message when the vibration has stopped for a minute or so.
I'm purchased
-Adafruit Feather HUZZAH with ESP8266 module
and two different sensors:
-SW-420 vibration sensor
-analog ceramic piezo vibration sensor module 3.3v/5v
I'm trying to figure out how to attach these modules to the ESP board without overloading it because I understand that the voltage limits are very restrictive and I risk bricking the board if my voltages go too high.
What other electrics would I require?

Also, the piezo has three connectors, +,--, and NC. I played with the sensor with my multimeter connecting it to the + and -- terminals and seeing the voltage spike when i pressed it. I've seen a tutorial where they connected the NC to voltage and put a weight on the piezo, but the effects of these modifications weren't clear to me, should I do this too?

Thanks!

As I understand it NC normally means not connected.
It looks like your second sensor can be run at 3.3V or 5V. You need to check the requirements for the fist sensor and the current draw for both.