pH450c notes

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When wiring it is the same in other ph sensors like dFrobot ? Any tutorial? website? Need help badly.

 New contributor
  • This might help: raspberrypi.stackexchange.com/questions/96653/…. If you have more specific requirements, like orange juice pH only, I am happy to update my answer. BTW, this is a Rpi board, how come you are asking about the low tech Arduino? – tlfong01 2 hours ago    
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    i have a rPi4 but i have to calibrate the ph-4502c ph meter other suggest to using arduino. Anw sir you have a suggestion how to calibrate ph-4502c ph meter using rpi4 ? – sefrwsef sdfsdfsdf 1 hour ago
  • Ah, my answer to the above ph-4502C question has a detailed description on setting up and calibrating the pH values of about 10 substances. If there are things there not very clear, you can ask here. I am happy to entertain your question here. PS – I would suggest you to remove the word “Arduino” from your question. If you agree, I can do the modification for you, to the following: “How can Rpi connect, configure, and read the pH-450C sensor?”. Cheers. – tlfong01 54 mins ago   
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    sorry sir i’m newbie. Any skecth on connecting rpi4 to ph sensor ? i dont know how to start. – sefrwsef sdfsdfsdf 50 mins ago
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    Sir another question when i calibrate ph sensors to rpi does it mean i will calibrte again using arduino or rpi calibration is enough ? cause my friends said it i will calibrate again. – sefrwsef sdfsdfsdf 36 mins ago
  • Well there are two pictures in my answer referred above: (1) How to short the BNC connector input to output to calibrate the offset, (2) A pinout diagram explaining the function of each pin of the meter and how it is connected. Please let me know if you could not find the pictures or you don’t understand the meanings of the pins. I am assuming that you have the basic knowledge and skills: (a) Using the Rpi to blink a LED, (b) How to use a multi-meter to measure voltage, (c) Basic ideas of electricity, such as Ohm’s Law. – tlfong01 36 mins ago   
  • If you don’t meet above (a) and (b), you first need to spend some time reading the MagPi magazine and build up your skills. You just cannot jump start to the expensive pH meter or you will fry it! – tlfong01 36 mins ago   
  • Ah let me see. The calibration method I am using is the following: (a) Short BNC output to ground, so that sensor (not meter) output is forced to 0V, (b) adjust the potentiometer so that the meter output is 2.5V. This 2.5V adjustment/calibration value is very important, otherwise you won’t get appropriate values for water, orange juice, coke etc. Arduino is using the 8-bit low resolution on board ADC pin, aubt Rpi has no ADCpin, and need to use more precise external ADC module, like MCP3008 (10 bit) or MCP3208 (12 bit), or even 16 bit ADS1115. – tlfong01 23 mins ago   
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    Thank you sir. I learn a lot. YOur the best – sefrwsef sdfsdfsdf 20 mins ago
  • If you are a hobbyist, Arduino 8 bit precision (256 values == 0.4%) is OK. But if you are doing a fish water tank project like me, you better use higher precision to measure the pH. – tlfong01 20 mins ago   
  • You are welcome. Remember it is a long term project. It may take you 3 hobbyist months to google, wikipedia, and making, to fully understand what is going on. Happy project. Cheers. PS – Thank you for editing the question question title. I have taken the liberty to do more touches, like replacing “calibrating” to replace “configuring”, to make sound more user friendly. Also, you tagged “Rpi4”, so I modified the title using Rpi4 to tell the new visitors your question deals with Rpi4. – tlfong01 11 mins ago   
  • By the way, you have been asking very sensible newbie questions, and therefore very informative to other newbies to decide if they should invest their money on this expensive equipment. I also learned how to explain ideas better. Now let me tell you the Chinese word “knowledge” = “學問”, the two characters are “Learn” and “Ask”. I remember when I was three or four, my grandmother taught me that in order to learn, you need to ask, … I did ask my grandma a lot of questions, most of which she could not answer, because she was illiterate. So she always told me “Kid, go to the library, … ” 🙂 – tlfong01 8 secs ago   Edit   

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