Which sensor should I use to measure the volume?

Hi Philippe,

if you want to detect a sentence, you need iot and VPN to work with google assistant, cortana or alexa. You can find a nice exercise like that in the video below.

If you just want to measure the volume, go ahead and connect a microphone directly to the tokymaker input. Make sure that the microphone can work with 3.7v. 

Here is a link to a shop that sells these kind of sensors:

Taobao Link:

8fu置这行话 Http:/T$9EGOchqYroh$da開τa0寳【MAX4466声音传感器模块 麦克风前置放大器microphone】

Amazon Link:

https://www.amazon.com/HiLetgo-MAX4466-Amplificador-micr%C3%B3fono-el%C3%A9ctrico/dp/B07DRGF8C2/ref=sr_1_1_sspa?__mk_es_US=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=max4466&qid=1602590306&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExWVdHOUZITDdFQjAwJmVuY3J5cHRlZElkPUEwNTgwNjc4MTcxODQxVldMQzUyRiZlbmNyeXB0ZWRBZElkPUEwNjc1Mjc5M1ZXVzVMUllRRUZKQSZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=56