Can anyone please help me out with how to configure MAX31865? I am using 3 wired PT1000. I am also having doubt in connections between MAX31865 and Arduino nano.

 

Hi jv,
Perhaps this link will help you, if not please ask.
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https://learn.adafruit.com/adafruit-max31865-rtd-pt100-amplifier/overview

 

I went through it but I am not getting it.
If possible can you explain the statement " You will have to cut the thin trace in between the 2-way jumper on the right side of the board, and then solder closed the blob on the right side. Then next to the terminal block on the left, solder closed that jumper as well. Alternatively you can put a piece of wire into the terminal blocks to 'short' them".

Can you show it to me diagrammatically? like which wire should I cut?

 

hi jv,
This image shows the track cut and the solder blob, do you follow that OK?
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THANK YOU

 

i have another doubt how do we connect the pt1000 pins to max31865. I am using 3 wire pt1000. I am getting wrong values. it is throwing all the errors

 

Hi jv,
Please post a diagram showing how you have connected the PT1000 to the MAX and the remainder of the circuit.
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This is the schematic of the circuit.

 

Hi,
The PT1000 usually has two RED wires and one BLUE, connected as this image.
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Hi,
The PT1000 usually has two RED wires and one BLUE, connected as this image.
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View attachment 321648

My PT1000 is having two blue wires and and one red wire

 

Hi,
With your ohm meter, measure the resistance between the two Blue wires, it should be close to 0 Ohms.
Then measure from the Blue/s to the Red it should be ~1000 Ohms.
Tell me what you measure.

E

Added image:

 

Hi,
With your ohm meter, measure the resistance between the two Blue wires, it should be close to 0 Ohms.
Then measure from the Blue/s to the Red it should be ~1000 Ohms.
Tell me what you measure.

E

Added image:
View attachment 321653

THANK YOU. I will tell you.

 

Hi,
With your ohm meter, measure the resistance between the two Blue wires, it should be close to 0 Ohms.
Then measure from the Blue/s to the Red it should be ~1000 Ohms.
Tell me what you measure.

E

Added image:
View attachment 321653
A small doubt there should be zero connectivity between the marked points right?

 

There should be zero connectivity between these two points rights?

 

Hi,
Thats what the d/s notes say,
You will have to cut the thin trace in between the 2-way jumper on the right side of the board,
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13:07:07.653 -> Temperature: -242.02 °C

13:07:13.062 -> Temperature: -242.02 °C

13:07:14.096 -> Temperature: -242.02 °C

13:07:15.210 -> Temperature: -242.02 °C

13:07:16.268 -> Temperature: -242.02 °C

13:07:17.327 -> Temperature: -242.02 °C

13:07:18.443 -> Temperature: -242.02 °C

13:07:19.515 -> Temperature: -242.02 °C

13:07:20.582 -> Temperature: -242.02 °C

13:07:21.655 -> Temperature: -242.02 °C

13:07:22.742 -> Temperature: -242.02 °C

13:07:23.787 -> Temperature: -242.02 °C


i dont know why but it is constantly showing me this

 

Hi rj.
Please post your Sketch and I will check your results.
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//I am using Arduino Nano

#include <Wire.h>

#include <Adafruit_MAX31865.h>

#define MAX31865_CS       10     // Chip select pin

#define MAX31865_MOSI     11   // SPI MOSI pin

#define MAX31865_MISO     12  // SPI MISO pin

#define MAX31865_CLK      13   // SPI Clock pin

Adafruit_MAX31865 max31865 = Adafruit_MAX31865(MAX31865_CS, MAX31865_CLK, MAX31865_MISO, MAX31865_MOSI);

void setup() {

  Serial.begin(9600);

  max31865.begin(MAX31865_3WIRE);

}

void loop() {

  // Read temperature in Celsius

  float temperature = max31865.temperature(1000, 4300);

  // Check if there's an error

  if (isnan(temperature)) {

    Serial.println("Error reading temperature!");

  } else {

    // Print the temperature

    Serial.print("Temperature: ");

    Serial.print(temperature);

    Serial.println(" °C");

  }

  delay(1000); // Delay for 1 second

}

 

Hi,
I will check that Code.
Do you have a photo showing the wiring to the PT1000 , MAX and the Nano, that you could post?
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Update:
Did you do this check?
With your ohm meter, measure the resistance between the two Blue wires, it should be close to 0 Ohms.
Then measure from the Blue/s to the Red it should be ~1000 Ohms.
Tell me what you measure

 

this is the schematic