Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to interface a 7-inch display with a Beelink MINI S12 N95 computer, a fingerprint scanner, an ESP32 CAM module, and an Arduino UNO microcontroller. The circuit is powered by a PC Power Supply connected to a 240V power source. Communication between the ESP32 CAM and a computer is facilitated by an FTDI Programmer. The circuit is designed for tasks that require visual output, biometric input, and image capture capabilities.

Component List

Display 7 inch

• Pins: HDMI, USB Power, USB Touch Screen
• Description: A 7-inch display used for visual output from the Beelink MINI S12 N95.

Beelink MINI S12 N95

• Pins: Power, USB 2, USB 3, HDMI 1, HDMI 2, USB 1, USB 4, LAN
• Description: A compact computer providing the main processing capabilities and interfaces for the circuit.

Fingerprint Scanner

• Pins: VCC, TX, RX, GND
• Description: A biometric device used to capture fingerprints for identification purposes.

PC Power Supply

• Pins: 220V AC In, PC Power Out
• Description: Supplies power to the Beelink MINI S12 N95.

240v Power Source

• Pins: Live, Neutral
• Description: The main AC power source for the circuit.

ESP32 CAM

• Pins: 5V, GND, GPIO12, GPIO13, GPIO15, GPIO14, GPIO2, GPIO4, 3.3V, GPIO16, GPIO0, 3.3V / 5V / P_OUT, GPIO3 / RX, GPIO1 / TX
• Description: A camera module with Wi-Fi capabilities, used for image capturing and processing.

FTDI Programmer

• Pins: DTR, RX, TX, VCC, CTS, GND
• Description: Used for programming and communication with the ESP32 CAM module.

USB Plug

• Pins: GND, D+, D-, 5V+, Out
• Description: Provides a USB interface for power and data transfer.

Arduino UNO

• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0-A5, SCL, SDA, AREF, D0-D13
• Description: A microcontroller board used for controlling the fingerprint scanner and other peripherals.

Wiring Details

Display 7 inch

• HDMI connected to Beelink MINI S12 N95 HDMI 1
• USB Power connected to Beelink MINI S12 N95 USB 3
• USB Touch Screen connected to Beelink MINI S12 N95 USB 1

Beelink MINI S12 N95

• Power connected to PC Power Supply PC Power Out
• USB 2 connected to USB Plug Out
• USB 4 connected to another USB Plug Out

Fingerprint Scanner

• VCC connected to Arduino UNO 5V
• TX connected to Arduino UNO D2
• RX connected to Arduino UNO D3
• GND connected to Arduino UNO GND

PC Power Supply

• 220V AC In connected to 240v Power Source Live and Neutral

ESP32 CAM

• 5V connected to USB Plug 5V+
• GND connected to USB Plug GND
• GPIO16 connected to ESP32 CAM 3.3V (for camera operation)
• GPIO3 / RX connected to FTDI Programmer TX
• GPIO1 / TX connected to FTDI Programmer RX
• GND connected to FTDI Programmer GND

Arduino UNO

• 5V, D2, D3, and GND used for interfacing with the Fingerprint Scanner

Documented Code

Arduino UNO Code (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Note: The provided code for the Arduino UNO is a template with empty setup and loop functions. This code should be expanded to initialize the fingerprint scanner and handle the data communication between the scanner and the Arduino UNO.