Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [max31865]

7 questions
9
votes
3 answers

Why does a Pt100 RTD fail after immersion in thermally conductive and electrically isolating paste?

I currently have a Class A Pt100 RTD connected via an Adafruit RTD amplifier to an Arduino using SPI. It has good thermal contact with the warm surface after immersion in a thermally conductive (and electrically isolating) paste. There is no…
Jeremy G
  • 107
  • 1
  • 5
1
vote
1 answer

MAX31865 and MAX31855 Completely not Working

I am beginner in Electronics. While working with MAX31865 and MAX31855 Modules it was working perfectly, but after designing custom PCB based on modules its not working. RTD shows -242C and 982C randomly and Thermocouple shows -100C, is there any…
Jay Vadoliya
  • 144
  • 9
0
votes
1 answer

MAX31865 RTD IC: What is CI's capacitor purpose?

What is the Purpose of CI capacitor? The datasheet does not mention anything for it except its recommended value. My guess is that it is used to suppress RF noise on the PT100/PT1000 cable. But It mentions different value capacitor for PT100 and…
Christianidis Vasileios
  • 2,645
  • 2
  • 9
  • 32
0
votes
0 answers

Need help with MAX31865

I am trying to program an ESP32-S3 microcontroller to write and read the registers of a MAX31865 IC over SPI, but I cannot get anything meaningful out of the device. The following image shows the schematic of the IC. The pins are connected to an…
Marcell Juhász
  • 255
  • 2
  • 10
0
votes
1 answer

MAX31855 K type thermocouple being affected by power supply and motor

I have an ESP32 that has 3 MAX31855 sensors measuring 3 temperatures. All temperatures are reading excellent when connecting only the computer USB to the ESP32 module, but when I plug my external AC-DC 12V 8A 100W Switching Power Supply …
VAAA
  • 145
  • 6
0
votes
2 answers

How to configure the MAX31865 IC for PT100/PT1000 on the fly?

The MAX31865 is an RTD to digital converter IC. I want to measure both PT100 and PT1000 on the fly without changing REF resistor. A 430ohm resistor is need for PT100 and a 4.3kohm resistor is need for PT1000. I want to design a circuit that is…
Berker Işık
  • 445
  • 2
  • 14
0
votes
1 answer

PCB design for MAX31865+INA219

I'm designing a PCB for a device, which will contain the following functional blocks: 12V power input with SCR crowbar, reverse polarity protection, soft-start, and 3.3V linear regulator. Regulator feeds all ICs on the board…
Zhenek
  • 601
  • 7
  • 18