PH Sensor
Grove
Table of contents
Summary
A low cost PH sensor. The pH probe measures the hydrogen-ion activity in water-based solutions.
Name: Grove - PH Sensor Kit (E-201C-Blue)
Link: https://www.seeedstudio.com/Grove-PH-Sensor-Kit-E-201C-Blue-p-4577.html
Calibration: Calibrated against 2 known buffer solutions
Type: Analog
Operational Range: 0 to 60 degrees C
Unit: N/A
Range: 1 to 14
Maintenance: ~1 year
Life Expenctancy: 2 years
Maintenance
The probe must be dipped into a buffer solution of pH 7 or distilled water between detecting different solutions.
The electrode can be soak in 4%HF for 3-5 seconds, rinsed with distilled water, then soaked in 3.3mol KCl.
Calibration
Link: https://wiki.seeedstudio.com/Grove-PH-Sensor-kit/
Materials
Hardware
Grove-PH Sesnor kit Seeeduino Lotus 2 solutions with known pH
Software
Arduino IDE
Calibration Steps
- Set up the Arduino.
- Download the demo code from the link in the summary and paste the whole file into the root of the Arduino.
- Open the pH_meter_V1_1 with the Arduino IDE.
- Flash the device.
- Place the probe in calibration solution A. Record the voltage.
- Rinse the probe in distilled water.
- Place the probe in calibration solution B. Record the voltage.
- The formula for k is (pH of solution A - ph of solution B)/(voltage of solution A - voltage of solution B)
- The formula for Offset is [(pH of solution A + ph of solution B)-k(voltage of solution A + voltage of solution B)]/2
- Change the Offset value in the code (line 10).
Notes
This sensor may not be submerged in liquid for a long period of time.
When not in use, the probe should be in the sleeve with a solution of 3.3mol KCL.
JSON
{
name: "ph", # string
data_type: "pH", # string
data_value: # float
}