From b7e56e6a69f326d3ac8e6fdbc2463c00609e064a Mon Sep 17 00:00:00 2001 From: sam rolfe Date: Tue, 2 Dec 2025 17:03:40 +1100 Subject: [PATCH] Initial commit: ESP32-CAM Slave Logic --- .vscode/arduino.json | 6 + .vscode/c_cpp_properties.json | 449 ++++++++++++++++++++++++++++++++++ README.md | 25 ++ front_door_cam.ino | 79 ++++++ 4 files changed, 559 insertions(+) create mode 100644 .vscode/arduino.json create mode 100644 .vscode/c_cpp_properties.json create mode 100644 README.md create mode 100644 front_door_cam.ino diff --git a/.vscode/arduino.json b/.vscode/arduino.json new file mode 100644 index 0000000..47bb9c9 --- /dev/null +++ b/.vscode/arduino.json @@ -0,0 +1,6 @@ +{ + "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" +} \ No newline at end of file diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json new file mode 100644 index 0000000..698b940 --- /dev/null +++ b/.vscode/c_cpp_properties.json @@ -0,0 +1,449 @@ +{ + "version": 4, + "configurations": [ + { + "name": "Arduino", + "compilerPath": "/home/sam/.arduino15/packages/esp32/tools/esp-x32/2411/bin/xtensa-esp32-elf-g++", + "compilerArgs": [ + "-MMD", + "-w", + "-Werror=return-type", + "-mfix-esp32-psram-cache-issue", + "-mfix-esp32-psram-cache-strategy=memw", + "-iprefix" + ], + "intelliSenseMode": "gcc-x64", + "includePath": [ + "/media/sam/8294CD2994CD2111/Users/Dell/Documents/Arduino/front_door_cam", + "/home/sam/.arduino15/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.5-129cd0d2-v4/esp32/dio_qspi/include", + "/home/sam/.arduino15/packages/esp32/hardware/esp32/3.3.1/cores/esp32", + "/home/sam/.arduino15/packages/esp32/hardware/esp32/3.3.1/variants/esp32", + "/home/sam/.arduino15/packages/esp32/tools/esp-x32/2411/xtensa-esp-elf/include/c++/14.2.0", + "/home/sam/.arduino15/packages/esp32/tools/esp-x32/2411/xtensa-esp-elf/include/c++/14.2.0/xtensa-esp-elf/esp32", + "/home/sam/.arduino15/packages/esp32/tools/esp-x32/2411/xtensa-esp-elf/include/c++/14.2.0/backward", + "/home/sam/.arduino15/packages/esp32/tools/esp-x32/2411/lib/gcc/xtensa-esp-elf/14.2.0/include", + "/home/sam/.arduino15/packages/esp32/tools/esp-x32/2411/lib/gcc/xtensa-esp-elf/14.2.0/include-fixed", + "/home/sam/.arduino15/packages/esp32/tools/esp-x32/2411/xtensa-esp-elf/include" + ], + "forcedInclude": [ + "/home/sam/.arduino15/packages/esp32/hardware/esp32/3.3.1/cores/esp32/Arduino.h" + ], + "cStandard": "c11", + "cppStandard": "c++11", + "defines": [ + "F_CPU=240000000L", + "ARDUINO=10607", + "ARDUINO_ESP32_DEV", + "ARDUINO_ARCH_ESP32", + "ARDUINO_BOARD=\"ESP32_DEV\"", + "ARDUINO_VARIANT=\"esp32\"", + "ARDUINO_PARTITION_huge_app", + "ARDUINO_HOST_OS=\"linux\"", + "ARDUINO_FQBN=\"esp32:esp32:esp32cam:CPUFreq=240,FlashMode=dio,PartitionScheme=huge_app,FlashFreq=40,DebugLevel=info,EraseFlash=all\"", + "ESP32=ESP32", + "CORE_DEBUG_LEVEL=3", + "BOARD_HAS_PSRAM", + "ARDUINO_USB_CDC_ON_BOOT=0", + "__DBL_MIN_EXP__=(-1021)", + "__XCHAL_HAVE_FP=1", + "__cpp_nontype_template_parameter_auto=201606L", + "__UINT_LEAST16_MAX__=0xffff", + "__ATOMIC_ACQUIRE=2", + "__FLT_MIN__=1.1754943508222875e-38F", + "__GCC_IEC_559_COMPLEX=0", + "__XCHAL_HAVE_PREDICTED_BRANCHES=0", + "__cpp_aggregate_nsdmi=201304L", + "__UINT_LEAST8_TYPE__=unsigned char", + "__INTMAX_C(c)=c ## 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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 diff --git a/front_door_cam.ino b/front_door_cam.ino new file mode 100644 index 0000000..e9b24e5 --- /dev/null +++ b/front_door_cam.ino @@ -0,0 +1,79 @@ +#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); + } + } +} \ No newline at end of file