OV5640 Camera for XIAO ESP32S3 Sense - How to use Autofocus?

Products & Technology XIAO
20

quote=“kaloyan, post:7, topic:272485”]
OV5640
[/quote]

Hi there,

Not sure if it’s helpful , or “While You wait” but I managed to put together some edits to the Streaming web server code to use the boot button on the Xiao S3 to manually trigger AF on the camera. Unfortunately the unit I ordered is on back order so I’m limited in testing it, I get a serial message that it’s “Triggering OV5640 autofocus manually…” as programed and I see th the I2C commands going out,
BTW, I’m talking directly to the hardware NOT the ESP_camera.h FYI.

It boots and connects to the wifi, I can open the webpage and see the camera image A text board at any distance , when pressing the boot button will AF the camera.
LMK if your capable to test it and I’ll post it.
or Wait for the Seeedineers to do there thing.:crossed_fingers:

HTH
GL :slight_smile: PJ

FYI , it’s not that hard if you can compile and run the standard web page stream example.

void loop() {
  if (digitalRead(BOOT_BUTTON_PIN) == LOW) {
    unsigned long current_time = millis();
    if (current_time - last_af_time > af_debounce_time) {
      trigger_ov5640_autofocus();
      last_af_time = current_time;
    }
  }

  delay(100);
}

void trigger_ov5640_autofocus() {
  Serial.println("Triggering OV5640 autofocus manually...");
  i2cWriteReg(OV5640_ADDR, 0x3000, 0x20);
  delay(10);
  i2cWriteReg(OV5640_ADDR, 0x3000, 0x00);
  delay(10);
  i2cWriteReg(OV5640_ADDR, 0x3022, 0x08);
  delay(500);
}

void i2cWriteReg(uint8_t addr, uint16_t reg, uint8_t data) {
  Wire.beginTransmission(addr);
  Wire.write((reg >> 8) & 0xFF);
  Wire.write(reg & 0xFF);
  Wire.write(data);
  Wire.endTransmission();
}

it’s basically this above … including Wire of course. :+1:

Typical OV5640 Useful Commands (Registers)

Register Address Purpose Example
0x3008 System control Soft reset (0x82)
0x3103 Clock selection Set input clock
0x3022 Autofocus command Start AF (0x08)
0x3000 Power down AF module Enable/disable AF
0x3400-0x3406 Manual white balance Adjust RGB gains
0x3500-0x3503 Exposure control Manual exposure settings
0x3A00 AE/AGC control Enable Auto Exposure / Gain
0x5300-0x5396 Color matrix settings Image tuning (sharpness, contrast, etc.)
0x3600-0x36FF ISP controls Low-level tweaks to internal processing
0x3810-0x3815 Cropping/windowing Zooming into sub-areas

It’s all in the Data sheet…