hello,
I’ve been working on making a DIY Infrared Thermal Imaging Camera with MLX90640 and ESP32.
I have attached the wiring diagram I used.
the code i used i got it from this
site https://www.instructables.com/Infrared-Thermal-Imaging-Camera-With-MLX90640-and-/
I did everything right, but it’s still showing me an error: it says ‘serial’ was not declared in this scope. Let me know if you can help me out.
I appreciate any help you can provide.
Try re-pasting the code and diagram (it limits your first post)
This work?
(Source
SparkFun_MLX90640_Arduino_Example/Firmware/Example1_BasicReadings/Example1_BasicReadings.ino at master · sparkfun/SparkFun_MLX90640_Arduino_Example · GitHub )
/*
Read the temperature pixels from the MLX90640 IR array
By: Nathan Seidle
SparkFun Electronics
Date: May 22nd, 2018
License: MIT. See license file for more information but you can
basically do whatever you want with this code.
Feel like supporting open source hardware?
Buy a board from SparkFun! https://www.sparkfun.com/products/14769
This example initializes the MLX90640 and outputs the 768 temperature values
from the 768 pixels.
This example will work with a Teensy 3.1 and above. The MLX90640 requires some
hefty calculations and larger arrays. You will need a microcontroller with 20,000
bytes or more of RAM.
This relies on the driver written by Melexis and can be found at:
https://github.com/melexis/mlx90640-library
Hardware Connections:
Connect the SparkFun Qwiic Breadboard Jumper (https://www.sparkfun.com/products/14425)
to the Qwiic board
Connect the male pins to the Teensy. The pinouts can be found here: https://www.pjrc.com/teensy/pinout.html
Open the serial monitor at 9600 baud to see the output
*/
#include <Wire.h>
#include "MLX90640_API.h"
#include "MLX90640_I2C_Driver.h"
const byte MLX90640_address = 0x33; //Default 7-bit unshifted address of the MLX90640
#define TA_SHIFT 8 //Default shift for MLX90640 in open air
static float mlx90640To[768];
paramsMLX90640 mlx90640;
void setup()
{
Wire.begin();
Wire.setClock(400000); //Increase I2C clock speed to 400kHz
Serial.begin(9600);
while (!Serial); //Wait for user to open terminal
Serial.println("MLX90640 IR Array Example");
if (isConnected() == false)
{
Serial.println("MLX90640 not detected at default I2C address. Please check wiring. Freezing.");
while (1);
}
Serial.println("MLX90640 online!");
//Get device parameters - We only have to do this once
int status;
uint16_t eeMLX90640[832];
status = MLX90640_DumpEE(MLX90640_address, eeMLX90640);
if (status != 0)
Serial.println("Failed to load system parameters");
status = MLX90640_ExtractParameters(eeMLX90640, &mlx90640);
if (status != 0)
Serial.println("Parameter extraction failed");
//Once params are extracted, we can release eeMLX90640 array
}
void loop()
{
for (byte x = 0 ; x < 2 ; x++) //Read both subpages
{
uint16_t mlx90640Frame[834];
int status = MLX90640_GetFrameData(MLX90640_address, mlx90640Frame);
if (status < 0)
{
Serial.print("GetFrame Error: ");
Serial.println(status);
}
float vdd = MLX90640_GetVdd(mlx90640Frame, &mlx90640);
float Ta = MLX90640_GetTa(mlx90640Frame, &mlx90640);
float tr = Ta - TA_SHIFT; //Reflected temperature based on the sensor ambient temperature
float emissivity = 0.95;
MLX90640_CalculateTo(mlx90640Frame, &mlx90640, emissivity, tr, mlx90640To);
}
for (int x = 0 ; x < 10 ; x++)
{
Serial.print("Pixel ");
Serial.print(x);
Serial.print(": ");
Serial.print(mlx90640To[x], 2);
Serial.print("C");
Serial.println();
}
delay(1000);
}
//Returns true if the MLX90640 is detected on the I2C bus
boolean isConnected()
{
Wire.beginTransmission((uint8_t)MLX90640_address);
if (Wire.endTransmission() != 0)
return (false); //Sensor did not ACK
return (true);
}
No, there is an error in the code: “serial” is not declared
Post the code, using code tags.
hello
no the code does not work its says :
In function 'int MLX90640_I2CRead(uint8_t, unsigned int, unsigned int, uint16_t*)
Compilation error: ‘Wire’ was not declared in this scope
‘Serial’ was not declared in this scope
48 | Serial.println(“No ack read”);
POST ALL THE CODE, using code tags (“<>” editor button).
i added the wiring diagram,but i couldnt upload files so i provided the link
copy/paste the code into your post, using code tags.
i did that,i downloaded the code, and i think i dowloaded the right libraries,but its not working and its driving me crazy
You need to post the code that you are actually trying to compile, directly into your post, using code tags.
The link is useless, because you may have altered the code or incorrectly copy/pasted it.
#include <Adafruit_MLX90640.h>
#include <Wire.h>
#include "MLX90640_API.h"
#include "MLX90640_I2C_Driver.h"
#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
// For the ESP-WROVER_KIT, these are the default.
#define TFT_CS 15
#define TFT_DC 2
#define TFT_MOSI 13
#define TFT_CLK 14
#define TFT_RST 26
#define TFT_MISO 12
#define TFT_LED 27
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_MOSI, TFT_CLK, TFT_RST, TFT_MISO);
const byte MLX90640_address = 0x33; //Default 7-bit unshifted address of the MLX90640
#define TA_SHIFT 8 //Default shift for MLX90640 in open air
static float mlx90640To[768];
paramsMLX90640 mlx90640;
int xPos, yPos; // Abtastposition
int R_colour, G_colour, B_colour; // RGB-Farbwert
int i, j; // Zählvariable
float T_max, T_min; // maximale bzw. minimale gemessene Temperatur
float T_center; // Temperatur in der Bildschirmmitte
// ***************************************
// **************** SETUP ****************
// ***************************************
void setup()
{
Serial.begin(115200);
Wire.begin();
Wire.setClock(400000); //Increase I2C clock speed to 400kHz
while (!Serial); //Wait for user to open terminal
Serial.println("MLX90640 IR Array Example");
if (isConnected() == false)
{
Serial.println("MLX90640 not detected at default I2C address. Please check wiring. Freezing.");
while (1);
}
Serial.println("MLX90640 online!");
//Get device parameters - We only have to do this once
int status;
uint16_t eeMLX90640[832];
status = MLX90640_DumpEE(MLX90640_address, eeMLX90640);
if (status != 0)
Serial.println("Failed to load system parameters");
status = MLX90640_ExtractParameters(eeMLX90640, &mlx90640);
if (status != 0)
{
Serial.println("Parameter extraction failed");
Serial.print(" status = ");
Serial.println(status);
}
//Once params are extracted, we can release eeMLX90640 array
MLX90640_I2CWrite(0x33, 0x800D, 6401); // writes the value 1901 (HEX) = 6401 (DEC) in the register at position 0x800D to enable reading out the temperatures!!!
// ===============================================================================================================================================================
//MLX90640_SetRefreshRate(MLX90640_address, 0x00); //Set rate to 0.25Hz effective - Works
//MLX90640_SetRefreshRate(MLX90640_address, 0x01); //Set rate to 0.5Hz effective - Works
//MLX90640_SetRefreshRate(MLX90640_address, 0x02); //Set rate to 1Hz effective - Works
//MLX90640_SetRefreshRate(MLX90640_address, 0x03); //Set rate to 2Hz effective - Works
MLX90640_SetRefreshRate(MLX90640_address, 0x04); //Set rate to 4Hz effective - Works
//MLX90640_SetRefreshRate(MLX90640_address, 0x05); //Set rate to 8Hz effective - Works at 800kHz
//MLX90640_SetRefreshRate(MLX90640_address, 0x06); //Set rate to 16Hz effective - Works at 800kHz
//MLX90640_SetRefreshRate(MLX90640_address, 0x07); //Set rate to 32Hz effective - fails
pinMode(TFT_LED, OUTPUT);
digitalWrite(TFT_LED, HIGH);
tft.begin();
tft.setRotation(1);
tft.fillScreen(ILI9341_BLACK);
tft.fillRect(0, 0, 319, 13, tft.color565(255, 0, 10));
tft.setCursor(100, 3);
tft.setTextSize(1);
tft.setTextColor(ILI9341_YELLOW, tft.color565(255, 0, 10));
tft.print("Thermographie - stoppi");
tft.drawLine(250, 210 - 0, 258, 210 - 0, tft.color565(255, 255, 255));
tft.drawLine(250, 210 - 30, 258, 210 - 30, tft.color565(255, 255, 255));
tft.drawLine(250, 210 - 60, 258, 210 - 60, tft.color565(255, 255, 255));
tft.drawLine(250, 210 - 90, 258, 210 - 90, tft.color565(255, 255, 255));
tft.drawLine(250, 210 - 120, 258, 210 - 120, tft.color565(255, 255, 255));
tft.drawLine(250, 210 - 150, 258, 210 - 150, tft.color565(255, 255, 255));
tft.drawLine(250, 210 - 180, 258, 210 - 180, tft.color565(255, 255, 255));
tft.setCursor(80, 220);
tft.setTextColor(ILI9341_WHITE, tft.color565(0, 0, 0));
tft.print("T+ = ");
// drawing the colour-scale
// ========================
for (i = 0; i < 181; i++)
{
//value = random(180);
getColour(i);
tft.drawLine(240, 210 - i, 250, 210 - i, tft.color565(R_colour, G_colour, B_colour));
}
}
// **********************************
// ************** LOOP **************
// **********************************
void loop()
{
for (byte x = 0 ; x < 2 ; x++) //Read both subpages
{
uint16_t mlx90640Frame[834];
int status = MLX90640_GetFrameData(MLX90640_address, mlx90640Frame);
if (status < 0)
{
Serial.print("GetFrame Error: ");
Serial.println(status);
}
float vdd = MLX90640_GetVdd(mlx90640Frame, &mlx90640);
float Ta = MLX90640_GetTa(mlx90640Frame, &mlx90640);
float tr = Ta - TA_SHIFT; //Reflected temperature based on the sensor ambient temperature
float emissivity = 0.95;
MLX90640_CalculateTo(mlx90640Frame, &mlx90640, emissivity, tr, mlx90640To);
}
// determine T_min and T_max and eliminate error pixels
// ====================================================
mlx90640To[1*32 + 21] = 0.5 * (mlx90640To[1*32 + 20] + mlx90640To[1*32 + 22]); // eliminate the error-pixels
mlx90640To[4*32 + 30] = 0.5 * (mlx90640To[4*32 + 29] + mlx90640To[4*32 + 31]); // eliminate the error-pixels
T_min = mlx90640To[0];
T_max = mlx90640To[0];
for (i = 1; i < 768; i++)
{
if((mlx90640To[i] > -41) && (mlx90640To[i] < 301))
{
if(mlx90640To[i] < T_min)
{
T_min = mlx90640To[i];
}
if(mlx90640To[i] > T_max)
{
T_max = mlx90640To[i];
}
}
else if(i > 0) // temperature out of range
{
mlx90640To[i] = mlx90640To[i-1];
}
else
{
mlx90640To[i] = mlx90640To[i+1];
}
}
// determine T_center
// ==================
T_center = mlx90640To[11* 32 + 15];
// drawing the picture
// ===================
for (i = 0 ; i < 24 ; i++)
{
for (j = 0; j < 32; j++)
{
mlx90640To[i*32 + j] = 180.0 * (mlx90640To[i*32 + j] - T_min) / (T_max - T_min);
getColour(mlx90640To[i*32 + j]);
tft.fillRect(217 - j * 7, 35 + i * 7, 7, 7, tft.color565(R_colour, G_colour, B_colour));
}
}
tft.drawLine(217 - 15*7 + 3.5 - 5, 11*7 + 35 + 3.5, 217 - 15*7 + 3.5 + 5, 11*7 + 35 + 3.5, tft.color565(255, 255, 255));
tft.drawLine(217 - 15*7 + 3.5, 11*7 + 35 + 3.5 - 5, 217 - 15*7 + 3.5, 11*7 + 35 + 3.5 + 5, tft.color565(255, 255, 255));
tft.fillRect(260, 25, 37, 10, tft.color565(0, 0, 0));
tft.fillRect(260, 205, 37, 10, tft.color565(0, 0, 0));
tft.fillRect(115, 220, 37, 10, tft.color565(0, 0, 0));
tft.setTextColor(ILI9341_WHITE, tft.color565(0, 0, 0));
tft.setCursor(265, 25);
tft.print(T_max, 1);
tft.setCursor(265, 205);
tft.print(T_min, 1);
tft.setCursor(120, 220);
tft.print(T_center, 1);
tft.setCursor(300, 25);
tft.print("C");
tft.setCursor(300, 205);
tft.print("C");
tft.setCursor(155, 220);
tft.print("C");
delay(20);
}
// ===============================
// ===== determine the colour ====
// ===============================
void getColour(int j)
{
if (j >= 0 && j < 30)
{
R_colour = 0;
G_colour = 0;
B_colour = 20 + (120.0/30.0) * j;
}
if (j >= 30 && j < 60)
{
R_colour = (120.0 / 30) * (j - 30.0);
G_colour = 0;
B_colour = 140 - (60.0/30.0) * (j - 30.0);
}
if (j >= 60 && j < 90)
{
R_colour = 120 + (135.0/30.0) * (j - 60.0);
G_colour = 0;
B_colour = 80 - (70.0/30.0) * (j - 60.0);
}
if (j >= 90 && j < 120)
{
R_colour = 255;
G_colour = 0 + (60.0/30.0) * (j - 90.0);
B_colour = 10 - (10.0/30.0) * (j - 90.0);
}
if (j >= 120 && j < 150)
{
R_colour = 255;
G_colour = 60 + (175.0/30.0) * (j - 120.0);
B_colour = 0;
}
if (j >= 150 && j <= 180)
{
R_colour = 255;
G_colour = 235 + (20.0/30.0) * (j - 150.0);
B_colour = 0 + 255.0/30.0 * (j - 150.0);
}
}
//Returns true if the MLX90640 is detected on the I2C bus
boolean isConnected()
{
Wire.beginTransmission((uint8_t)MLX90640_address);
if (Wire.endTransmission() != 0)
return (false); //Sensor did not ACK
return (true);
} Please edit your post to add the code tags. Select the text and use the “<>” code button to format it properly.
Also post the complete error message, using code tags.
Failure to pay careful attention to instructions can be a serious problem in advanced, technical hobbies like this one.
Why is this “urgent”?
hello
alright,i will try and edit the code.
Im new to this and this is my first time using the platform so im unfamiliar with how this should be.
Compilation error: 'MLX90640_DumpEE' was not declared in this scopeMy guess is that you copied that code from somewhere, but installed one or more wrong device libraries. In particular the code mixes Sparkfun and Adafruit libraries for the MLX90640, which is a bad idea.
Start over from the beginning. Find a good “getting started” tutorial (Sparkfun or Adafruit, for example) and follow the directions step by step, very carefully.
do you happen to know where i can find the right librabries?
Yes.
Carefully follow the instructions in the getting started tutorial you have selected.
The ones from our guide will work for the examples in our guide (note that the guide uses a Teensy Microcontroller, you won’t need the mentioned Teensyduino library, you’ll use esp32)
I suggest downloading the library and loading example1 from the mlx examples menu (with esp32 as your board selected)