MAX31855 Only Reading 0

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1

I have been using the MAX31855 (https://www.adafruit.com/product/269) with the Type-K Thermo-Couple (Thermocouple Type-K Glass Braid Insulated [K] : ID 270 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits).

Initially I tested all of them on the bread board individually and they worked fine. I then soldered the MAX31855s onto a protoboard and soldered wires to the protoboard that would connect to the arduino. I originally did this with a seperate CLK, CS, and DO for each MAX31855 (I have 3). Then after I had issues I looked through all of the other threads on this same issue and one of the suggestions was that the MAX31855s can share a CLK and a DO. I then soldered the connections shown on the bottom of the protoboard (pictures below) to create a common DO and a common CLK for the MAX31855s.

Also, per the suggestions of the numerous other threads on this topic I have checked all of my connections numerous times both visually and using a multimeter.

The only output I am getting is 32 degrees F, 0 degrees C. The same is true when I read the internal temperature of each of the MAX31855s.

Someone please help.

Code and pictures attached

program.ino (4.75 KB)

IMG_0278.JPG
IMG_0278.JPG3024×4032 914 KB

IMG_0280.JPG
IMG_0280.JPG3024×4032 617 KB

2

Allegron2:
I have been using the MAX31855 (Thermocouple Amplifier MAX31855 breakout board (MAX6675 upgrade) : ID 269 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits) with the Type-K Thermo-Couple (Thermocouple Type-K Glass Braid Insulated [K] : ID 270 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits).

Initially I tested all of them on the bread board individually and they worked fine. I then soldered the MAX31855s onto a protoboard and soldered wires to the protoboard that would connect to the arduino. I originally did this with a seperate CLK, CS, and DO for each MAX31855 (I have 3). Then after I had issues I looked through all of the other threads on this same issue and one of the suggestions was that the MAX31855s can share a CLK and a DO. I then soldered the connections shown on the bottom of the protoboard (pictures below) to create a common DO and a common CLK for the MAX31855s.

Also, per the suggestions of the numerous other threads on this topic I have checked all of my connections numerous times both visually and using a multimeter.

The only output I am getting is 32 degrees F, 0 degrees C. The same is true when I read the internal temperature of each of the MAX31855s.

Someone please help.

Code and pictures attached

Is that board you have them soldered to designed like a bread board?

If so, you have the Vin, and GND connected to GND. Your white wires should be soldered to the Red Bus, your power(5v).

I do not think your MAX31855 are receiving any Power.

Connect all of the Vin's together,
Connect all of the GND's together
Connect all of the DO's together
Connect all of the CLK together

Vin connects to 5V, VCC
GND connects to GND
DO connects to MISO Mega D48
CLK connects to SCK Mega D49

each of the separate CS needs it's own pin, it look like you are using D28,D26,D24 That is fine.

Try wiring it this way.

Chuck.