I can't read tempreture

[saint98]

Hi,
When I connect the K- Type termocouple, the screen shows preheat 0.00 c, the problem persists when I change the termocouple directions.
I use MAX31855.

My Arduino code starts as below ;

// Comment either one the following #define to select your board revision
// Newer board version starts from v1.60 using MAX31855KASA+ chip
#define USE_MAX31855
// Older board version below version v1.60 using MAX6675ISA+ chip
//#define USE_MAX6675

// ***** INCLUDES *****
#include <LiquidCrystal.h>
#ifdef USE_MAX31855
#include <MAX31855.h>
#else
#include <max6675.h>
#endif
#include <PID_v1.h>

What other line should I change other than the lines above? I am using code v.1.2 board 1R80.
Best regards.

[rocketscream]

May I know when was this board purchased? We have since long stop selling 1R80.
That is the only section of code you need to change to use the 1R80 board.

[saint98]

Hi, I use Gerber file and I produced pcb myself.
When I checked the A1 pin with an oscilloscope, I could not observe the clock frequency. arduino clock does not generate signal. If I ask you, can you send me the code and library files that you are sure it works?

[rocketscream]

The posted code in this repository is the one last I have tested with V1 of the controller.
The libraries for the MAX31855. I didn't touch it since then.
Probably it's just a hardware connection issue.