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Topic: 4 K-type Thermocouples (Read 123 times) previous topic - next topic

racheleden04

Hello!

Is it possible to hook up 4 seperate thermocouples to an Arduino Uno, and then import that into Matlab and have all reading at once?

Can Arduino read 4 at the same time without issues?

lakshmi123

Hi
Please have a look at below project
https://hackaday.io/project/165129-16-channel-thermocouple-multiplexer-for-raspi

Thanks.

Wawa

Yes, dunno, no, no.
Thermocouples have a very low output voltage that needs amplification before is can be processed by the Arduino.
Four thermocouple amplifiers shouldn't be a problem, but the Arduino can only process one at the time.
Usually is not a problem, because on a human time-scale it all seems to happen at once.
No nothing about Matlab.

Something to read.
Leo..

terryking228

#3
Feb 18, 2020, 01:46 pm Last Edit: Feb 18, 2020, 01:46 pm by terryking228
Hi, Yes...

You only need 2 pins for SCK and SO on MAX6675 type interface chips.  Then you will need separate CS Chip Select pins for each thermocouple.. Typical interface board looks like this:


See THIS PAGE for How-To.

There are examples:

  • Thermocouple with MAX6675 to Serial Monitor
  • Thermocouple with MAX6675 to LCD Display
  • TwoThermocouples with MAX6675 to LCD Display


You just need to expand to 4 thermocouples and handle the data going to Matlab.

Let us know how it goes...

Regards, Terry King terry@yourduino.com  - Check great prices, devices and Arduino-related boards at http://YourDuino.com
HOW-TO: http://ArduinoInfo.Info

gilshultz

Reading all at once, that is not doable with normal Arduino hardware.  However in rapid succession it is very doable.  The reason is the SPI can only receive data from one sensor at a time.  If you run short of pins you can use something like a 74HC138 which needs 3 control lines for 8 sensors or the 74HC154 which will need one more control line. You then run CS through them.  This response is to help you get started in solving your problem, not solve it for you.
Good Luck & Have Fun!
Gil
This response is to help you get started in solving your problem, not solve it for you.
Good Luck & Have Fun!
Gil

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