7asson93 on ESP8266 sending voltage readings to thingspeak

Hello, 

I'm trying to send voltage data to thingspeak, there are tons of tutorial using the DHT sensor, but I'm trying to send a normal voltage reading from the ESP8266 GIPO 2 to thingspeak. 

I'm trying to do something like this, but only to read voltage output from a sensor. 

can someone do the code for me, I've been trying for months. it should be very simple for you guys, please help me.