Hi Billie, Thanks for the quick reply :-) Is the pH Meter all the time into the water to measure the pH? I had some information which sad that letting the ph probe all the time in the liquid will cause damage? Perhaps this is wrong I only want to confirm it.
And second question : basically I only need one ph Probe and two peristaltic Pumps to setup a pH measure and adjustment station? I have a Arduino UNO Board with max. 5V on the Digital Output with max. 30mA
I have found those two things now: http://www.aliexpress.com/item/Free-shipping-6V-DC-DIY-Dosing-pump-Peristaltic-dosing-Head-For-Aquarium-Lab-Analytical-water/1003369174.htmlhttp://www.aliexpress.com/item/PH-Electrode-Probe-BNC-Connector-for-Aquarium-PH-Controller-Meter-Sensor-NI5L/938643629.html
Do I can connect them directly to the board or do I need a extra power supply ?
And as I have rad you divided the code so I can just take the part that fits?
And last but not least : Why do you use a DC 9V plug for your arduino ? I thought 5V is max Greetings