I am currently doing a school project where I am making a pH meter with Arduino. I currently have the LCD and everything setup on the arduino and i created this Building the Simplest Possible pH Meter • 66pacific.com . I have no idea how i am supposed to connect this to arduino and have the arduino read the voltage to convert it into data that can be displayed on an lcd display. I also need help on a code that would help do this.
First you should have the PH probe and look how it works and achieve display by Serial.println (), when it works well, then you could get an LCD (
) connected in this way: Arduino Playground - LCD3wires. then it is very easy to write to the LCD.
I hope it works for you. greetings.
Borrajo.
To read a voltage on the arduino UNO you use one of the analogue pins (A0-A5).
They can only measure positive voltages between 0 and 5 volts, so no negative voltage and if the upper limit is over 5V then you need to use a voltage divider to keep below 5V.
Using analogRead(Ax) the voltage is sampled and returned as a 10 bit result between 0 & 1023.
If the maximum voltage your measuring is small (below 1.1v) then you can set to use the internal analogue voltage reference to give you a finer result.