I have just purchased an ESP32 Cam module. I set it up and loaded two separate sketches which worked first time. When I loaded a third program (time lapse) that worked but I couldn't load anything after that one. I get the error message:
A fatal error occurred: Failed to connect to ESP32: Wrong boot mode detected (0xb)! The chip needs to be in download mode.
I think it might have something to do with the code of that final, third program:
/****************************************************************************
* ESP32 Hacks (c) 2021 Marcio Teixeira *
* *
* https://github.com/marciot/esp32-hacks *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* To view a copy of the GNU General Public License, go to the following *
* location: <http://www.gnu.org/licenses/>. *
****************************************************************************/
#include <SD_MMC.h>
#include "esp_camera.h"
#define MINUTES_BETWEEN_PHOTOS 0.5
// Pins for ESP32-CAM
#define FLASH_PIN 4
// Camera pins
#define PWDN_GPIO_NUM 32
#define RESET_GPIO_NUM -1
#define XCLK_GPIO_NUM 0
#define SIOD_GPIO_NUM 26
#define SIOC_GPIO_NUM 27
#define Y9_GPIO_NUM 35
#define Y8_GPIO_NUM 34
#define Y7_GPIO_NUM 39
#define Y6_GPIO_NUM 36
#define Y5_GPIO_NUM 21
#define Y4_GPIO_NUM 19
#define Y3_GPIO_NUM 18
#define Y2_GPIO_NUM 5
#define VSYNC_GPIO_NUM 25
#define HREF_GPIO_NUM 23
#define PCLK_GPIO_NUM 22
bool startMicroSD() {
Serial.print("Starting microSD... ");
// Pin 13 needs to be pulled-up
// https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/sd_pullup_requirements.html#pull-up-conflicts-on-gpio13
pinMode(13, OUTPUT);
digitalWrite(13, HIGH);
if(SD_MMC.begin("/sdcard", true)) {
Serial.println("OKAY");
return true;
} else {
Serial.println("FAILED");
return false;
}
}
bool startCamera() {
// Turn off the flash
pinMode(FLASH_PIN, OUTPUT);
digitalWrite(FLASH_PIN, LOW);
// Initialize the camera hardware
camera_config_t config;
config.ledc_channel = LEDC_CHANNEL_0;
config.ledc_timer = LEDC_TIMER_0;
config.pin_d0 = Y2_GPIO_NUM;
config.pin_d1 = Y3_GPIO_NUM;
config.pin_d2 = Y4_GPIO_NUM;
config.pin_d3 = Y5_GPIO_NUM;
config.pin_d4 = Y6_GPIO_NUM;
config.pin_d5 = Y7_GPIO_NUM;
config.pin_d6 = Y8_GPIO_NUM;
config.pin_d7 = Y9_GPIO_NUM;
config.pin_xclk = XCLK_GPIO_NUM;
config.pin_pclk = PCLK_GPIO_NUM;
config.pin_vsync = VSYNC_GPIO_NUM;
config.pin_href = HREF_GPIO_NUM;
config.pin_sscb_sda = SIOD_GPIO_NUM;
config.pin_sscb_scl = SIOC_GPIO_NUM;
config.pin_pwdn = PWDN_GPIO_NUM;
config.pin_reset = RESET_GPIO_NUM;
config.xclk_freq_hz = 20000000;
config.pixel_format = PIXFORMAT_JPEG;
// Set resolution based on whether we have extra memory
if(psramFound()){
Serial.println("PSRAM found. Maximum XGA resolution supported.");
config.frame_size = FRAMESIZE_XGA;
config.jpeg_quality = 10;
config.fb_count = 2;
} else {
Serial.println("PSRAM not found. Maximum SVGA resolution supported.");
config.frame_size = FRAMESIZE_SVGA;
config.jpeg_quality = 12;
config.fb_count = 1;
}
// Start the camera
Serial.print("Starting camera... ");
esp_err_t err = esp_camera_init(&config);
if (err != ESP_OK) {
Serial.println("FAILED");
return false;
} else {
Serial.println("OKAY");
return true;
}
}
void takePhoto(String filename) {
// Take a photo and get the data
camera_fb_t *fb = esp_camera_fb_get();
if (!fb) {
Serial.println("Unable to take a photo");
return;
}
// Make sure it is a JPEG
if (fb->format != PIXFORMAT_JPEG) {
Serial.println("Capture format not JPEG");
esp_camera_fb_return(fb); // Return the photo data
return;
}
// Save the picture to the SD card
File file = SD_MMC.open(filename.c_str(), "w");
if(file) {
Serial.println("Saving " + filename);
file.write(fb->buf, fb->len);
file.close();
// Momentarily blink the flash
digitalWrite(FLASH_PIN, HIGH);
delay(100);
digitalWrite(FLASH_PIN, LOW);
delay(500);
} else {
Serial.println("Unable to write " + filename);
}
// Return the picture data
esp_camera_fb_return(fb);
}
void setup() {
// Initialize the peripherals
Serial.begin(115200);
while(!Serial) delay(100);
startMicroSD();
startCamera();
delay(5000); // Delay 5 seconds before first photo
}
void loop() {
// Keep a count of the number of photos we have taken
static int number = 0;
number++;
// Construct a filename that looks like "/photo_0001.jpg"
String filename = "/photo_";
if(number < 1000) filename += "0";
if(number < 100) filename += "0";
if(number < 10) filename += "0";
filename += number;
filename += ".jpg";
takePhoto(filename);
// Delay until the next photo
delay(MINUTES_BETWEEN_PHOTOS * 60 * 1000);
}
I've searched the web and lots of people are saying to press the "boot" button when uploading a sketch. My module doesn't have one!
Here's a link to the one that I bought:
https://www.ebay.co.uk/itm/254810284860
Any help will be greatly appreciated
Thanks
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