Freenove ESP32 User Manual

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Chapter 14 Camera Web Server
█ www.freenove.com
Open the video streams server function of the camera and print its IP address via serial port.
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startCameraServer();
Serial.print("Camera Ready! Use 'http://");
Serial.print(WiFi.localIP());
Serial.println("' to connect");
Configure the display image information of the camera.
The set_vflip() function sets whether the image is flipped 180°, with 0 for no flip and 1 for flip 180°.
The set_brightness() function sets the brightness of the image, with values ranging from -2 to 2.
The set_saturation() function sets the color saturation of the image, with values ranging from -2 to 2.
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sensor_t * s = esp_camera_sensor_get();
// initial sensors are flipped vertically and colors are a bit saturated
if (s->id.PID == OV3660_PID) {
s->set_vflip(s, 1); // flip it back
s->set_brightness(s, 1); // up the brightness just a bit
s->set_saturation(s, -2); // lower the saturation
}
Modify the resolution and sharpness of the images captured by the camera. The sharpness ranges from 10 to
63, and the smaller the number, the sharper the picture. The larger the number, the blurrier the picture. Please
refer to the table below.
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config.frame_size = FRAMESIZE_UXGA;
config.jpeg_quality = 10;
config.fb_count = 2;
Reference
Image resolution
Sharpness
Image resolution
Sharpness
FRAMESIZE_QQVGA
160x120
FRAMESIZE_VGA
640x480
FRAMESIZE_QQVGA2
128x160
FRAMESIZE_SVGA
800x600
FRAMESIZE_QCIF
176x144
FRAMESIZE_XGA
1024x768
FRAMESIZE_HQVGA
240x176
FRAMESIZE_SXGA
1280x1024
FRAMESIZE_QVGA
320x240
FRAMESIZE_UXGA
1600x1200
FRAMESIZE_CIF
400x296
FRAMESIZE_QXGA
2048x1536

Freenove ESP32 Specifications

General

Clock Speed	240 MHz
RAM	520 KB SRAM
Wi-Fi	802.11 b/g/n
UART	3
Operating Voltage	3.3V
Input Voltage	5V
DC Current per I/O Pin	40mA
USB	Micro USB
Microcontroller	ESP32
Chip	ESP32
Bluetooth	Bluetooth v4.2 BR/EDR and BLE standard
ADC Channels/Analog Input Pins	18
I2C	Yes
SPI	Yes
Interfaces	I2C, SPI, UART
CPU	Dual-Core 32-bit LX6 Microprocessor

Summary

Safety and Precautions

General Safety Guidelines

Outlines crucial safety measures for handling and using the robot kit to prevent injury or damage.

Hardware Components

ESP32 Expansion Board and Modules

Details the ESP32 expansion board, ESP32 module, camera, and other electronic components.

Mechanical Parts and Tools

Lists acrylic parts, servos, screws, nuts, standoffs, and necessary tools for assembly.

Software and Firmware Setup

CH340 Driver and Firmware Installation

Guides on installing the CH340 driver and burning firmware for OS.

Freenove App and Arduino IDE Setup

Covers installing the Freenove app and setting up the Arduino IDE environment.

ESP32 Pin Configuration

Details ESP32 pins, their functions, and descriptions for robot connectivity.

Robot Assembly and Calibration

Step-by-Step Assembly Guide

Details the process of assembling the robot's body, legs, head, and wiring.

Servo Wiring and Calibration

Guides on connecting ESP32, batteries, servos, and performing robot calibration.

Robot Functionality and Control

Freenove App Features

Overviews app features like Wi-Fi config, LED control, and interaction.

Ultrasonic Ranging and Motion Control

Explains ultrasonic sensor and provides code for robot movements.

Communication Protocols and Commands

Explains communication commands via Serial, BLE, Wi-Fi, and development aspects.