My voltage is reading zero no matter what I do. Does this mean I need to replace the 0.5 mol/L NaOH filling solution? Or am I simply not handing the code correctly? Thanks!
Hi, thank you for the great video. Odd question here, does the electrode of the probe touch the membrane? I'm asking because I recently bought one. Thanks in advance
Hello, so i want to use this sensor and been following this tutorial but always ended up with the adc raw and voltage not stable. it value could go higher or lower by a lot of margin without any change of the liquid. pls help or recomend any solution, TIA!
I'm using the filling solution with 100ml with 2g sodium hydroxide and trying to calibrate but the value is too low, 3 - 4 mg/L. should I change the membrane cap? Thanks
Esp32 has 12bit adc. This code is written for arduino and esp8266 which has 10 bit adc. You have to modify code for 12bit adc for esp32. Also the ESp32 adc in not linear as well which will give incorrect readings.
Thank you so much for such a very good and nice video, it is helpful a lot. I already subscribe to your channel. I have some question about the quality of water to prepare the solution (purified,...)? and if we need a temperature sensor near the D.O probe if the temperature inside we expected changing? Thanks
@@L2505 am order to test result is work. we can dip in along time just we must replace 0.5%MOL naoh and new calibration every month on fresh water condition .
Hi earlier I have Accurate results in my DO readings which is 5000 plus and ADC voltage is 1000 plus but then things go wrong and i dont know why is my adc voltage showing 0 to 20 or sometimes 200 something and my DO reading is constantly showing 201 or 79 and the results are so random. Please answer I really need to finish my project thanks.
