Hello everyone, I want to use PT100 sensor with Arduino. It has a 3-wire structure. Red red and white. I need to power this sensor with Wheatstone and op-amp circuit.But I saw so many options and I was so confused. I have LM358 and LM741 integrated circuits and many resistors. I need two circuits that can read values between -20 and +100 degrees and between 0 and 85 degrees. Can you show me this in a simple way, as if you were showing it to an idiot? Thanks in advance
Is this two separate PT100 sensors? Are you required to use a PT100 sensor or can you use anything you want? Can you explain what you are measuring the temperature of?
This is the very best and simplest way to use the PT100 sensor.
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I have to use 2 separate pt100s. It is used in a device that works with combi boiler logic. I don't want to use Max31865. Because I can use 1 card per card.
FYI 1 sensor can measure both ranges. What processor are you using? What are its power source(s)? Can you post a link to the technical information on the sensor? A PT100 sensor is a good choice.
I am considering 5v as the power supply, but if necessary, I can reduce it to 7805 district. Two different point measurements are made
Are you saying you will reduce 5V to 5V?
Please answer the question.
I don't understand what this means. Can you explain?
The information I see online about this system indicates that it uses thermistors. Is your system like that? Are you replacing an existing control system?
From what I see so far, conditioning PT100 sensors with
wouldn't be my first choice.
I need to use robodyn mega pro. Therefore we can connect 1 for max31865. 2. The sensor also needs to read. We will switch a simple machine that actively works with a PLC system to a card system. I mentioned Lm741 and 358 as much as I found on the internet. In short, I need a circuit. I need help. I'm weak in electronics
[quote="gilshultz, post:5, topic:1285772"]
What processor are you using
[/quote]No, I meant that we can reduce 24v to 5v with 7805 if necessary. I use robodyn mega pro
MAX31865 has an SPI interface so you can easily use two with your controller.
Can you give an example? I will also use HMI screen connection via SPI. Will I experience fatigue or problems when 2 or 3 are connected at the same time?
For an SPI interface, you will need a separate CS (chip select) for each device. Your Mega controller has many available pins to use for CS. Having 2 or 3 SPI devices connected will not pose any problems.
It's time for you to post a schematic diagram of your proposed project if you want any specific help hooking it up.
I'm not at home right now. It is easily understood when I describe it. Since I haven't finished the system completely yet, no drawing has been created.
16 digital pins filled, 4 expansions for 12 relays. 3 analog pins are occupied. For now, I have written and checked the sensors and other components externally. I'm thinking of making a schematic when the Pt100 is finished. I shared a photo for the PID of the card I will use.
