Unit Finger Arduino Tutorial

/**
 * @file Unit_Finger_M5CoreS3.ino
 * @author Zovey (liangzhuowei@m5stack.com)
 * @brief
 * @version 0.1
 * @date 2025-07-04
 *
 *
 * @Hardwares: M5CoreS3 + Unit Finger
 * @Dependent Library:
 * M5_FPC1020A: https://github.com/m5stack/M5-FPC1020A
 */

#include "M5Unified.h"
#include "M5_FPC1020A.h"

M5_FPC1020A finger;

bool add_user_process(uint8_t id, uint8_t permission);
bool id_input = 1, id_Verification = 1, id_delete = 1;

void setup() {
    M5.begin();
    Serial.begin(115200);
    M5.Display.fillRect(0, 0, 320, 240, WHITE);
    M5.Display.setTextColor(BLACK);
    M5.Display.setFont(&fonts::FreeMonoBold9pt7b);
    M5.Display.setCursor(0, 0);
    M5.Display.println("Finger Unit init...");
    if (!finger.begin(&Serial2, 1, 2, 19200)) {
        Serial.println("FPC1020A not found");
        while (1) delay(1);
    }
    M5.Display.fillRect(0, 0, 320, 240, WHITE);
    M5.Display.println("Finger Unit TEST");
    finger.delAllFinger();
    M5.Display.println("All ID have been deleted");
}

void loop() {
    while(id_input){
        M5.Display.fillScreen(WHITE);
        M5.Display.println("Please logic your finger");
        if(add_user_process(1, 1)){
            Serial.println("add user success");
            M5.Display.println("add user success");
            id_input = 0;
        }
    }
    delay(2000);
    while(id_Verification){
        M5.Display.fillScreen(WHITE);
        M5.Display.setCursor(0, 0);
        M5.Display.printf("User ID Verification:\r\n");
        uint8_t res = finger.available();
        if (res == ACK_SUCCESS){
            M5.Display.print("Success \r");
            Serial.println("Success");
            M5.Display.print("User ID: ");
            Serial.print("User ID: ");
            M5.Display.println(finger.getFingerID());
            Serial.println(finger.getFingerID());
            id_Verification = 0;
        }
        delay(2000);
    }
    while(id_delete){
        uint8_t res2 = finger.available();
        M5.Display.printf("Put your finger on the sensor again can delete all id\n");
        if (res2 == ACK_SUCCESS){
            finger.delAllFinger();
            M5.Display.println("All ID have been deleted");
            Serial.println("All ID have been deleted");
            id_delete = 0;
        }
        delay(2000);
    }
}

bool add_user_process(uint8_t id, uint8_t permission) {
    M5.Display.fillRect(0, 0, 320, 240, WHITE);
    M5.Display.setCursor(0, 0);
    M5.Display.println("add finger process:");
    M5.Display.println("put your finger on the sensor");
    for (uint8_t i = 0; i < 6; i++) {
        while (!finger.addFinger(id, permission, i)) {
            Serial.printf("Finger ID: %d Finger Record:%d error\r\n", id, i);
            Serial.println("Retry...");
            delay(1000);
        };
        M5.Display.printf("add finger count : %d/6\r\n", i + 1);
        Serial.printf("Finger ID: %d Finger Record:%d ok\r\n", id, i);
    }
    return true;
}