Please add the following components:
https://atlas-scientific.com/circuits/ezo-ph-circuit/ <—pH sensor
https://www.amazon.com/Raspberry-Model-2019-Quad-Bluetooth/dp/B07TC2BK1X/ref=sr_1_3?crid=36NAVSLB1V327&dchild=1&keywords=raspberry+pi+4&qid=1604428768&sprefix=rasp%2Caps%2C239&sr=8-3 <— Raspberry pi 4