In this project I will show you how to build a basic pH regulator using cheap electronic components that are readily available online. The regulator can be controlled and monitored online through the Blynk app dashboard and through interaction with the device.
This project is easily modifiable to use other types of components, like peristaltic pumps or liquid valves to regulate pH up or down, depending on what kind of project/system that you are using it with. It can be modified to supply both pH hightening and pH lowering agents, which can be used in gardening systems like hydroponics/aquaponics where pH can both rise and fall depending on the many enviromental factors in the system.
- Liquid PH0-14 Value Sensor Module + BNC PH Electrode Probe for Arduino
- Arduino MEGA 2560 R3 ATMEGA16U2 ATMEGA2560-16AU Board
- W5100 Arduino Ethernet Shield
- LCD Keypad Shield
- KY-040 Rotary Encoder Module
- Solid State Relay SSR-80DD-DC-control input 3-32V DC, output 5-60V DC
- 1/4″ 2 Way Normally Closed Pneumatic Aluminum Electric Solenoid Air Valve 12V DC and some pneumatic couplings.
- A 12V power supply and a Male power jack for the arduino (the build in regulator will take the voltage down to 5V. 12V goes directly to the solenoid valve)
- A diode to prevent counter-electromotive force from the solenoid valve (see this PDF). I had my arduino crashing every time the valve shut off before i installed this.
- Female to female jumper wires and Male to female jumper wires
- AND preferably a box to put it all in/on
You can also buy the pH probe seperately if you need a replacement. I’ve never needed one myself, having built three of these regulators running actively.
Download the blynk app from http://www.blynk.cc/ and make yourself an account.
Make a new project in the Blynk app and e-mail the authentication token to yourself.
Original link: http://www.instructables.com/id/IoT-PH-Regulator-With-Arduino-and-Blynk/