M5 Stick Unit Cam Wi-Fi Camera (OV2640) Documentation
The M5 Stick Unit Cam Wi-Fi Camera is a compact, low-power Wi-Fi camera module based on the OV2640 image sensor. It is designed to be used with the M5Stick series of microcontrollers, but can also be used with other microcontrollers and development boards. This camera module provides a high-quality VGA (640x480) image resolution, making it suitable for a wide range of IoT applications, such as home security, robotics, and computer vision projects.
Image Sensor: OV2640
Resolution: VGA (640x480)
Lens Type: Fixed Focus
Angle of View: 65
Interface: Wi-Fi, UART
Power Consumption: 150mA (typical), 250mA (max)
Operating Voltage: 3.3V
Dimensions: 24.5 x 24.5 x 15.5 mm
Example Code 1: Taking a Photo and Sending it via Wi-Fi using the M5StickC
This example demonstrates how to use the M5 Stick Unit Cam Wi-Fi Camera with an M5StickC microcontroller to take a photo and send it to a server using Wi-Fi.
```c
#include <M5StickC.h>
#include <WiFi.h>
#include <HTTPClient.h>
const char ssid = "your_wifi_ssid";
const char password = "your_wifi_password";
const char serverUrl = "http://your_server_url.com/upload_image";
M5StickC m5stickc;
WiFiClient client;
HTTPClient http;
void setup() {
Serial.begin(115200);
m5stickc.begin();
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to Wi-Fi...");
}
Serial.println("Wi-Fi connected");
}
void loop() {
camera_init(); // Initialize the camera
camera_snap(); // Take a photo
char imageData = camera_get_image(); // Get the image data
size_t imageSize = camera_get_image_size(); // Get the image size
http.begin(client, serverUrl);
http.addHeader("Content-Type", "image/jpeg");
int httpResponseCode = http.POST((uint8_t)imageData, imageSize);
http.end();
if (httpResponseCode > 0) {
Serial.println("Image uploaded successfully");
} else {
Serial.println("Error uploading image");
}
delay(10000); // Take a new photo every 10 seconds
}
void camera_init() {
pinMode(M5_STICK_CAM_PIN, OUTPUT);
digitalWrite(M5_STICK_CAM_PIN, LOW);
delay(100);
digitalWrite(M5_STICK_CAM_PIN, HIGH);
delay(100);
}
void camera_snap() {
digitalWrite(M5_STICK_CAM_PIN, LOW);
delay(50);
digitalWrite(M5_STICK_CAM_PIN, HIGH);
delay(50);
}
char camera_get_image() {
// Implement image data retrieval using UART communication
// with the camera module
}
size_t camera_get_image_size() {
// Implement image size retrieval using UART communication
// with the camera module
}
```
Example Code 2: Streaming Video using the M5 Stick Unit Cam Wi-Fi Camera with a Raspberry Pi
This example demonstrates how to use the M5 Stick Unit Cam Wi-Fi Camera with a Raspberry Pi to stream video over Wi-Fi using the FFmpeg library.
```python
import os
import cv2
import socket
# Set up the camera
-camera_url = "http://m5stickcam.local:8080 video"
cam = cv2.VideoCapture(camera_url)
# Set up the socket
HOST = '0.0.0.0'
PORT = 8080
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind((HOST, PORT))
sock.listen(1)
while True:
conn, addr = sock.accept()
print('Connected by', addr)
# Stream video using FFmpeg
os.system('ffmpeg -re -i %s -c:v libx264 -pix_fmt yuv420p -crf 18 -f flv tcp://%s:%d' % (camera_url, addr[0], PORT))
```
Note: In this example, the Raspberry Pi acts as a server, and the M5 Stick Unit Cam Wi-Fi Camera is the client streaming video to the Raspberry Pi. The FFmpeg library is used to stream the video from the camera module to the Raspberry Pi.
These examples demonstrate the basic functionality of the M5 Stick Unit Cam Wi-Fi Camera and provide a starting point for more complex IoT projects.
