I’ve used a PH probe from Inesa Scientific and a combination of DOC and Temperature sensor Arduino Uno and Raspberry Pi.
The current setup is as follows:
- Arduino gathers data from the probe and will display in Grafana through Node-Red. It shows the reading for every 1 second.
Th setup works quite well, but the readings are quite noisy. I’ve calibrated the probe using buffer solutions 7.01 and 4.01, and I’ve also installed a good power supply, as well as filter caps on the power input to the sensor board.
The weird thing is that the readings stabilize to within +/-0.2 when I put the probe in a beaker fill with the buffer solution. When the probe is in the container (10 litre of water) itself , the readings average about right, but spread from 6.8 to 4.
Please help me in this problem thank you