I got GetFrame Error: -1 with ESP32 WROOM & MLX90641
#include <Wire.h>
#include "MLX90641_API.h"
#include "MLX9064X_I2C_Driver.h"
const byte MLX90641_address = 0x33; //Default 7-bit unshifted address of the MLX90641
#define TA_SHIFT 8 //Default shift for MLX90641 in open air
uint16_t eeMLX90641[832];
float mlx90641To[192];
//uint16_t mlx90641Frame[834];
paramsMLX90641 mlx90641;
int errorno = 0;
void setup() {
Wire.begin();
Wire.setClock(400000); //Increase I2C clock speed to 400kHz
Serial.begin(115200); //Fast debug as possible
delay(2000);
Serial.println("MLX90641 IR Array Example");
if (isConnected() == false) {
Serial.println("MLX90641 not detected at default I2C address. Please check wiring. Freezing.");
while (1);
}
else Serial.println("I2C devices found\n");
//Get device parameters - We only have to do this once
int status;
status = MLX90641_DumpEE(MLX90641_address, eeMLX90641);
errorno = status;//MLX90641_CheckEEPROMValid(eeMLX90641);//eeMLX90641[10] & 0x0040;//
if (status != 0) {
Serial.println("Failed to load system parameters");
while(1);
}
for (int x = 0 ; x < 32 ; x++)
{
if(x % 32 == 0) Serial.println();
Serial.print(eeMLX90641[x], 2);
Serial.print(",");
} Serial.println("");
status = MLX90641_ExtractParameters(eeMLX90641, &mlx90641);
//errorno = status;
if (status != 0) {
Serial.println("Parameter extraction failed");
while(1);
}
//Once params are extracted, we can release eeMLX90641 array
MLX90641_SetRefreshRate(MLX90641_address, 0x03); //Set rate to 4Hz
//Once EEPROM has been read at 400kHz we can increase to 1MHz
//Wire.setClock(1000000); //Teensy will now run I2C at 800kHz (because of clock division)
}
void loop() {
float vdd = 0;
float Ta = 0;
uint16_t mlx90641Frame[242];
for (byte x = 0 ; x < 2 ; x++) {
int status = MLX90641_GetFrameData(MLX90641_address, mlx90641Frame);
if (status < 0) {
Serial.print("GetFrame Error: ");
Serial.println(status);
}
vdd = MLX90641_GetVdd(mlx90641Frame, &mlx90641);
Ta = MLX90641_GetTa(mlx90641Frame, &mlx90641);
float tr = Ta - TA_SHIFT; //Reflected temperature based on the sensor ambient temperature
float emissivity = 0.95;
MLX90641_CalculateTo(mlx90641Frame, &mlx90641, emissivity, tr, mlx90641To);
}
Serial.print("vdd=");
Serial.print(vdd,2);
Serial.print(",Ta=");
Serial.print(Ta,2);
Serial.println();
for (int x = 0 ; x < 64 ; x++) {
Serial.print(mlx90641Frame[x], HEX);
Serial.print(",");
}Serial.println();
for (int x = 0 ; x < 10 ; x++) {
Serial.print("Pixel ");
Serial.print(x);
Serial.print(": ");
Serial.print(mlx90641To[x], 2);
Serial.print("C");
Serial.println();
}
Serial.println();
delay(2000);
}
//Returns true if the MLX90641 is detected on the I2C bus
boolean isConnected() {
for (byte i = 0; i < 5; i++) {
Wire.beginTransmission((uint8_t)MLX90641_address);
if (Wire.endTransmission() == 0) {
return (true); //Sensor did not ACK
}
}
return false;
}
OUTPUT
14:51:55.831 → MLX90641_ExtractParameters(0) : 0
14:51:55.865 → MLX90641_ExtractDeviatingPixels(0) : 0
14:51:56.955 → vdd=-2.11,Ta=338.03
14:51:56.955 → FE53,FE68,FE8A,FE92,FE93,FE8A,FE9B,FE9B,FE89,FE88,FE83,FE81,FE66,FE5A,FE47,FE35,FE97,FE9C,FEAD,FEA7,FEA6,FEB0,FEB4,FEAF,FEAE,FEAD,FEAD,FE97,FE86,FE89,FE7A,FE51,FE76,FE90,FE94,FEA3,FEA8,FEA4,FEAA,FEAE,FEA3,FE97,FEA1,FE9C,FE84,FE7A,FE70,FE57,FEAC,FEA3,FEB2,FEB6,FEBA,FEB8,FEB9,FEB5,FEAD,FEB0,FEB5,FEA7,FE9E,FE96,FE8C,FE74,
14:51:56.990 → Pixel 0: 337.40C
14:51:56.990 → Pixel 1: 338.32C
14:51:56.990 → Pixel 2: 339.97C
14:51:56.990 → Pixel 3: 339.61C
14:51:56.990 → Pixel 4: 339.43C
14:51:56.990 → Pixel 5: 339.11C
14:51:56.990 → Pixel 6: 340.19C
14:51:56.990 → Pixel 7: 340.63C
14:51:56.990 → Pixel 8: 340.55C
14:51:56.990 → Pixel 9: 339.40C
14:51:57.031 →
14:51:58.984 → GetFrame Error: -1
14:52:00.563 → vdd=-0.69,Ta=310.68
14:52:00.563 → FC80,FC9D,FCDF,FCE6,FCE5,FCCB,FCEE,FCE8,FCC8,FCBE,FCB6,FCAE,FC7E,FC5E,FC3A,FC1E,FCE7,FCF6,FD15,FD03,FCF4,FD03,FD0A,FD04,FCFE,FCF6,FCFB,FCCD,FC9E,FCA6,FC90,FC4A,FCB2,FCE0,FCDD,FCED,FCFC,FCEE,FCFC,FCF7,FCE5,FCC3,FCDF,FCCF,FCA1,FC8C,FC7A,FC50,FD09,FCF9,FD0C,FD0B,FD0F,FD09,FD09,FD01,FCEB,FCEB,FCF9,FCE2,FCCA,FCBA,FCA9,FC80,
14:52:00.563 → Pixel 0: 308.43C
14:52:00.563 → Pixel 1: 309.19C
14:52:00.563 → Pixel 2: 310.65C
14:52:00.563 → Pixel 3: 310.40C
14:52:00.563 → Pixel 4: 310.34C
14:52:00.563 → Pixel 5: 310.05C
14:52:00.618 → Pixel 6: 310.91C
14:52:00.618 → Pixel 7: 311.21C
14:52:00.618 → Pixel 8: 311.16C
14:52:00.618 → Pixel 9: 310.21C
PJ 
