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Initial commit: ESP32-CAM Slave Logic

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sam rolfe
2025-12-02 17:03:40 +11:00
commit b7e56e6a69
4 changed files with 559 additions and 0 deletions
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.vscode/arduino.json vendored Normal file
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{
"configuration": "CPUFreq=240,FlashMode=dio,PartitionScheme=huge_app,FlashFreq=40,DebugLevel=info,EraseFlash=all",
"board": "esp32:esp32:esp32cam",
"port": "/dev/ttyUSB0",
"sketch": "front_door_cam.ino"
}

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# Front Door Camera (Slave Unit)
**Hardware:** ESP32-CAM (AI-Thinker Model) with OV2640 Sensor.
## Role in Project
This device acts as a "dumb" sensor for the main Doorbell Controller (ESP32-S3). It handles the specific timing requirements of the camera sensor to ensure clear images without "green tint" or stale buffers.
## Interface
* **Protocol:** UART Serial (TX/RX)
* **Baud Rate:** 115200
* **Wiring:**
* **5V/GND:** Shared with Master
* **U0R (RX):** Connected to Master TX (Pin 17)
* **U0T (TX):** Connected to Master RX (Pin 18)
## Logic Flow
1. Waits for character **'S'** on Serial.
2. **Double-Tap Capture:** Takes one photo and discards it (flushes sensor buffer), then immediately takes a second photo.
3. **Transmission:**
* Sends Image Size (4 Bytes).
* Sends raw JPEG Data.
## Flashing
* **Board:** AI Thinker ESP32-CAM
* **Mode:** DIO, 40MHz

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#include "esp_camera.h"
#include "soc/soc.h"
#include "soc/rtc_cntl_reg.h"
// AI-THINKER 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
void setup() {
WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0);
Serial.begin(115200);
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;
config.frame_size = FRAMESIZE_VGA;
config.jpeg_quality = 10; // Lower number = Higher Quality
config.fb_count = 1;
if (esp_camera_init(&config) != ESP_OK) {
return;
}
}
void loop() {
if (Serial.available()) {
char cmd = Serial.read();
if (cmd == 'S') { // Snap Command
// 1. FLUSH SENSOR (The "Double Tap")
// We grab a frame and immediately discard it to ensure the sensor
// is awake and exposure is calculated for the CURRENT moment.
camera_fb_t * fb = esp_camera_fb_get();
if(fb) esp_camera_fb_return(fb);
// 2. REAL CAPTURE
fb = esp_camera_fb_get();
if (!fb) return;
// 3. SEND DATA
uint32_t len = fb->len;
Serial.write((uint8_t*)&len, 4); // Send Length
Serial.write(fb->buf, fb->len); // Send Image
esp_camera_fb_return(fb);
}
}
}