ESP32 Sketch Uploaded but not executed

pxdigital · August 19, 2021, 3:06pm

Hello all,

I have a little problem with my ESP32 DEVKIT V1
I have a sketch which should be on the board but is not executed.

All librabrys are installed and the board is also addressed during upload. However, there is no reaction.

Sketch:
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

int UVOUT = 15; //Output from the sensor
int REF_3V3 = 4; //3.3V power on the ESP32 board

#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

void setup()
{
Serial.begin(9600);
pinMode(UVOUT, INPUT);
pinMode(REF_3V3, INPUT);
display.begin(SSD1306_SWITCHCAPVCC, 0x3C); //initialize with the I2C addr 0x3C (128x64)
display.clearDisplay();
}

//Takes an average of readings on a given pin
//Returns the average
int averageAnalogRead(int pinToRead)
{
byte numberOfReadings = 8;
unsigned int runningValue = 0;

for(int x = 0 ; x < numberOfReadings ; x++)
runningValue += analogRead(pinToRead);
runningValue /= numberOfReadings;

return(runningValue);
}

float mapfloat(float x, float in_min, float in_max, float out_min, float out_max)
{
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

void loop()
{
int uvLevel = averageAnalogRead(UVOUT);
int refLevel = averageAnalogRead(REF_3V3);

//Use the 3.3V power pin as a reference to get a very accurate output value from sensor
float outputVoltage = 3.3 / refLevel * uvLevel;

float uvIntensity = mapfloat(outputVoltage, 0.99, 2.8, 0.0, 15.0); //Convert the voltage to a UV intensity level

Serial.print("output: ");
Serial.print(refLevel);

Serial.print("ML8511 output: ");
Serial.print(uvLevel);

Serial.print(" / ML8511 voltage: ");
Serial.print(outputVoltage);

Serial.print(" / UV Intensity (mW/cm^2): ");
Serial.print(uvIntensity);
Serial.println();
display.setCursor(20,0); //oled display
display.setTextSize(1);
display.setTextColor(WHITE);
display.println("UV Ray Intensity");

display.setCursor(20,20); //oled display
display.setTextSize(3);
display.setTextColor(WHITE);
display.println(uvIntensity);

display.setCursor(20,45); //oled display
display.setTextSize(2);
display.setTextColor(WHITE);
display.println("mW/cm^2");
display.display();
delay(300);
display.clearDisplay();
}

Log during Upload:
esptool.py v3.0-dev
Serial port COM3
Connecting.......
Chip is ESP32-D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: ec:94:cb:4a:58:84
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 921600
Changed.
Configuring flash size...
Auto-detected Flash size: 4MB
Compressed 8192 bytes to 47...
Writing at 0x0000e000... (100 %)
Wrote 8192 bytes (47 compressed) at 0x0000e000 in 0.0 seconds (effective 1394.4 kbit/s)...
Hash of data verified.
Compressed 17120 bytes to 11164...
Writing at 0x00001000... (100 %)
Wrote 17120 bytes (11164 compressed) at 0x00001000 in 0.2 seconds (effective 825.1 kbit/s)...
Hash of data verified.
Compressed 242864 bytes to 125371...
Writing at 0x00010000... (12 %)
Writing at 0x00014000... (25 %)
Writing at 0x00018000... (37 %)
Writing at 0x0001c000... (50 %)
Writing at 0x00020000... (62 %)
Writing at 0x00024000... (75 %)
Writing at 0x00028000... (87 %)
Writing at 0x0002c000... (100 %)
Wrote 242864 bytes (125371 compressed) at 0x00010000 in 1.9 seconds (effective 1005.1 kbit/s)...
Hash of data verified.
Compressed 3072 bytes to 128...
Writing at 0x00008000... (100 %)
Wrote 3072 bytes (128 compressed) at 0x00008000 in 0.0 seconds (effective 585.1 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...

In the Serial Monitor i only get these:
Rebooting...
Guru Meditation Error: Core 1 panic'ed (IntegerDivideByZero). Exception was unhandled.
Core 1 register dump:
PC : 0x400d25b8 PS : 0x00060730 A0 : 0x800d12f0 A1 : 0x3ffb1f10
A2 : 0x3ffbdc60 A3 : 0x00000000 A4 : 0x00000001 A5 : 0x00000015
A6 : 0xffffffff A7 : 0x3ffbdc60 A8 : 0x800d25b8 A9 : 0x3ffb1ee0
A10 : 0x04c4b400 A11 : 0x00000014 A12 : 0x00000001 A13 : 0x00000001
A14 : 0x00060720 A15 : 0x00000000 SAR : 0x0000001c EXCCAUSE: 0x00000006
EXCVADDR: 0x00000000 LBEG : 0x4000c46c LEND : 0x4000c477 LCOUNT : 0x00000000

ELF file SHA256: 0000000000000000

Backtrace: 0x400d25b8:0x3ffb1f10 0x400d12ed:0x3ffb1f30 0x400d1c1e:0x3ffb1f50 0x400d0ed1:0x3ffb1f80 0x400d3d46:0x3ffb1fb0 0x400869bd:0x3ffb1fd0

Rebooting...
Guru Meditation Error: Core 1 panic'ed (IntegerDivideByZero). Exception was unhandled.
Core 1 register dump:
PC : 0x400d25b8 PS : 0x00060730 A0 : 0x800d12f0 A1 : 0x3ffb1f10
A2 : 0x3ffbdc60 A3 : 0x00000000 A4 : 0x00000001 A5 : 0x00000015
A6 : 0xffffffff A7 : 0x3ffbdc60 A8 : 0x800d25b8 A9 : 0x3ffb1ee0
A10 : 0x04c4b400 A11 : 0x00000014 A12 : 0x00000001 A13 : 0x00000001
A14 : 0x00060720 A15 : 0x00000000 SAR : 0x0000001c EXCCAUSE: 0x00000006
EXCVADDR: 0x00000000 LBEG : 0x4000c46c LEND : 0x4000c477 LCOUNT : 0x00000000

ELF file SHA256: 0000000000000000

Unfortunately, I do not have much experience with the arduinos which is why I do not understand where the error lies. Can anyone read something from this ?

Thanks in advance
Best regards

wildbill · August 19, 2021, 3:21pm

Error is division by zero. I can't see why. I suggest that you add some more serial prints, especially where you're doing division to narrow down where it fails.

johnwasser · August 19, 2021, 3:30pm

I get the same crash on my "DOIT ESP32 DEVKIT V1". I added some serial output and it looks like the crash happens in:
display.begin(SSD1306_SWITCHCAPVCC, 0x3C);

I would look at the Adafruit documentation for the SSD1306 display.

The i2c example in the library uses:

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// The pins for I2C are defined by the Wire-library. 
// On an arduino UNO:       A4(SDA), A5(SCL)
// On an arduino MEGA 2560: 20(SDA), 21(SCL)
// On an arduino LEONARDO:   2(SDA),  3(SCL), ...
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3D ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

and

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

When I did the initialization that way in the sketch I no longer got the crash:

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// The pins for I2C are defined by the Wire-library.
// On an arduino UNO:       A4(SDA), A5(SCL)
// On an arduino MEGA 2560: 20(SDA), 21(SCL)
// On an arduino LEONARDO:   2(SDA),  3(SCL), ...
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup()
{
  Serial.begin(9600);
  pinMode(UVOUT, INPUT);
  pinMode(REF_3V3, INPUT);
  Serial.println(++Index); Serial.flush();
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS))
  {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }

sterretje · August 19, 2021, 4:44pm

@pxdigital, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with your project See About the Installation & Troubleshooting category.

Can you please edit your opening post, select all code and click the </> button to apply code tags and next save your post. It makes it easier to read, easier to copy and prevents the forum software from incorrect interpretation of the code.

pxdigital · August 21, 2021, 9:20am

I tested another sketch without the display. The sensor works. i get good results over the serial monitor. So the problem must be the display integration

system · December 19, 2021, 9:20am

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