MAX31855 UNO
CLK . . . . . Digital 3
CS . . . . . . Digital 4
DO . . . . . . Digital 5
GND . . . . . GND
I downloaded:
Adafruit_MAX31855.h
and
Adafruit_MAX31855.cpp
I clicked on Sketch, Add File, and selected Adafruit_MAX31855.h
Then pressed The Checkmark (Verify File)
Error compiling for board Arduino/Genino Uno
I did the same for Adafruit_MAX31855.cpp, with no errors.
It stated Done compiling.
I pressed the right arrow (Upload)
I have a thermocouple connect to the MAX31855, but when I open Serial Monitor, there are no temp. readings. I even tried pressing enter after opening Serial Monitor.
1 The program that you compile will be on the first tab of the IDE and there will be only one tab with a name
2 The program can use code in one or more libraries
3 There will be two files for each library, both with the same name, one with an extension of .h and the second an extension of .cpp
4 To use the library files you use the #include directive like this
#include <name_of_library.h>
near the top of your program
5 Both library files should be in a folder with the same name as the files in the libraries folder of where your sketches are saved
6 The easiest way to install a library that you do not have is using the Library Manager in the IDE. Look at Sketch/Include Library/Manage Libraries in the IDE and enter the library name, or part of it in the search box
NOTE : There are possible exceptions to some of the points above but they are unlikely to be important in your case
This is my first project, so it's nice that you gave me some basics information.
I'll also read the link Pert provided, as I'd like to learn Arduino to expand my project once the basics are obtained.
I'm now getting readings to appear, but both the Internal Temp. 0.00 and C = 0.00.
I have tried two MAX31855 with two thermocouples, both show 0.00.
What can I change to get temperature readings and in Fahrenheit?
UKHeliBob:
I know that you posted a link to the code being used but please post a copy of it taken directly from your IDE
Doing what Pert said, here's the code:
/***************************************************
This is an example for the Adafruit Thermocouple Sensor w/MAX31855K
Designed specifically to work with the Adafruit Thermocouple Sensor
----> https://www.adafruit.com/products/269
These displays use SPI to communicate, 3 pins are required to
interface
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, all text above must be included in any redistribution
****************************************************/
#include <SPI.h>
#include "Adafruit_MAX31855.h"
// Default connection is using software SPI, but comment and uncomment one of
// the two examples below to switch between software SPI and hardware SPI:
// Example creating a thermocouple instance with software SPI on any three
// digital IO pins.
#define MAXDO 3
#define MAXCS 4
#define MAXCLK 5
// initialize the Thermocouple
Adafruit_MAX31855 thermocouple(MAXCLK, MAXCS, MAXDO);
// Example creating a thermocouple instance with hardware SPI
// on a given CS pin.
//#define MAXCS 10
//Adafruit_MAX31855 thermocouple(MAXCS);
void setup() {
while (!Serial); // wait for Serial on Leonardo/Zero, etc
Serial.begin(9600);
Serial.println("MAX31855 test");
// wait for MAX chip to stabilize
delay(500);
}
void loop() {
// basic readout test, just print the current temp
Serial.print("Internal Temp = ");
Serial.println(thermocouple.readInternal());
double c = thermocouple.readFarenheit();
if (isnan(c)) {
Serial.println("Something wrong with thermocouple!");
} else {
Serial.print("F = ");
Serial.println(c);
}
//Serial.print("F = ");
//Serial.println(thermocouple.readFarenheit());
delay(1000);
}
Please read the first post in any forum entitled how to use this forum. http://forum.arduino.cc/index.php/topic,148850.0.html then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.
You will have to redo those solder joints, longer time for the iron to be on the joint, before adding solder.
Do not be scared of leaving the iron there too long, place the hot iron on the joint and count to three before adding solder, hold another second, then take the iron away.
What sort of solder are you using?
TomGeorge:
You will have to redo those solder joints, longer time for the iron to be on the joint, before adding solder.
Do not be scared of leaving the iron there too long, place the hot iron on the joint and count to three before adding solder, hold another second, then take the iron away.
What sort of solder are you using?
Thanks.. Tom..
Tom, thank you. I was worried about holding it on too long, overheating the part. I will do as you said.
The solder I'm using is RadioShack Rosin Core with Oatey Lead-Free Tinning Flux.
Hi,
You shouldn't need the Tinning Flux, the Rosin Core should do the job.
The "trick" is to let the molten solder flow, it is a typical beginner reaction, but most parts can take quite a bit of heat and you will soon get the knack.
At my work we got one work experience guy who was having trouble with soldering to desolder an old throwout PCB, leave the components in and resolder them, the fact that solder had been on the surfaces helped, but he could safely see how much and how long he could apply the iron and the feel for feeding the solder in.
Check out some YouTube, and look at how flow solder and wave soldering is done in industry, pretty impressive stuff.
I switched them now I get:
MAX31855 test
Internal Temp = 30.06
Something wrong with thermocouple!
Internal Temp = 30.87
Something wrong with thermocouple!
Internal Temp = 31.37
Something wrong with thermocouple!
Internal Temp = 31.69
Something wrong with thermocouple!
Internal Temp = 31.94
Something wrong with thermocouple!
Internal Temp = 32.13
Something wrong with thermocouple!
Internal Temp = 32.31
Something wrong with thermocouple!
It looks like it's reading Celsius, and it looks like it's the thermocouple. Where is the Internal Temp coming from, as it keeps increasing over time?
Here's an updated circuit pic.
From the internal thermistor, it is part of the A/D converter section of the processor. If the analogRead command would allow it, it comes from multiplexer settings above 7.
It looks like it's reading Celsius, and it looks like it's the thermocouple.
I doubt it. It will increase over the short term until the processor stabilises.
From what you said then the libiary is working and your hardware is not.
Either a mistake in wiring, or in the code you wrote, or your hardware is faulty.
