Display of special charcter on 16x2 lcd when the sensor value reaches stability

Hi there,

I am trying to make a pH meter. For displaying the sensor value I am using a 16x2 lcd. Now I want to display a special character or symbol when the sensor value reaches exactly or close to the pH value of the solution whose pH is to be measured. So I need help in the code, that how can I detect the stable value of the pH sensor for a specific pH solution and hence display a special symbol.

Hope I would receive a solution very soon. And Thank you in advance. :slight_smile:

Arupd:
. . . how can I detect the stable value of the pH sensor . . .

Think of how you would you instruct an assistant to detect the same situation if he was looking at a portable meter with his eyes.

Don