Forum >DFRobot Gravity pH Sensor - Calibration Help Please!
DFRobot Gravity pH Sensor - Calibration Help Please!
dean 2019-03-09 17:22:22 5339 Views3 Replies Hey guys! I desperately need help calibrating this pH probe.
I am running the DFRobot Python code on github here.
https://github.com/DFRobot/DFRobot_PH/t ... yPi/Python
When I try to calibrate in a 4.0 solution, I am getting a readout that the probe has been calibrated for a 7.0 solution.
When I try to calibrate in a neutral 7.0 solution, I am getting a read out that the probe has been calibrated for a 4.0 solution.
I have checked the voltage when in the neutral 7.0 solution reading at 1855mv. I notice in the phdata.txt that neutral voltage is set at 1500mv.
My question is how do I adjust the probe to either measure 1500mv at solution 7.0 or adjust the script to calibrate the neutral 7.0 solution at 1855mv?
Im really stuck!
Thanks in advance!
I am running the DFRobot Python code on github here.
https://github.com/DFRobot/DFRobot_PH/t ... yPi/Python
When I try to calibrate in a 4.0 solution, I am getting a readout that the probe has been calibrated for a 7.0 solution.
When I try to calibrate in a neutral 7.0 solution, I am getting a read out that the probe has been calibrated for a 4.0 solution.
I have checked the voltage when in the neutral 7.0 solution reading at 1855mv. I notice in the phdata.txt that neutral voltage is set at 1500mv.
My question is how do I adjust the probe to either measure 1500mv at solution 7.0 or adjust the script to calibrate the neutral 7.0 solution at 1855mv?
Im really stuck!
Thanks in advance!
2020-09-15 07:35:39 Hi,
The calibration method is so easy if you are using the Ph Sensor for the first time.
Just rotate the Potentometer of the Ph Sensor and adjust the value when the Ph Electrode is dipped in Known value Solution.
I followed this very good article here: [http://how2electronics.com/ph-meter-usi ... uino-oled/] mamtaz
The calibration method is so easy if you are using the Ph Sensor for the first time.
Just rotate the Potentometer of the Ph Sensor and adjust the value when the Ph Electrode is dipped in Known value Solution.
I followed this very good article here: [http://how2electronics.com/ph-meter-usi ... uino-oled/]
mamtaz 2019-03-10 05:52:04 Hi,
Im sorry for posting this here.
I Can not find new post button.
I bought 2x2A DC Motor Shield for Arduino and i want toi know if i can power it by an external power différent from the Arduino power.
In this case i will have one power for Arduino and another power for Shield
How i Can Do it ? And how it can be the same gnd ?
Thankyou sedikmaarfi
Im sorry for posting this here.
I Can not find new post button.
I bought 2x2A DC Motor Shield for Arduino and i want toi know if i can power it by an external power différent from the Arduino power.
In this case i will have one power for Arduino and another power for Shield
How i Can Do it ? And how it can be the same gnd ?
Thankyou
sedikmaarfi 2019-03-09 17:42:40 Also, have tried changing the potentiometer to get the voltage down to 1500 but the potentiometer does not change the voltage at all. dean
dean 