i have not found any datasheet for the module itself, only for kits but i found one for the FPC-1020 module which i think is similar, here it is U008_Web.pdf (digikey.com) and 710-FPC1020_PB3_Product-Specification.pdf (shenzhen2u.com) i am using the arduino uno r3 board as of now but will soon switch over to esp32. here is the sample code, `//
// Demo code for FPC1020 Fingerprint Sensor
// Created by Deray on 2015-10-07.
//
#include <SoftwareSerial.h>
#include <FPC1020.h>
extern unsigned char l_ucFPID;
extern unsigned char rBuf[192]; //Receive return data
#define sw_serial_rx_pin 2 // Connect this pin to TX on the FPC1020
#define sw_serial_tx_pin 3 // Connect this pin to RX on the FPC1020
SoftwareSerial swSerial(sw_serial_rx_pin, sw_serial_tx_pin); // Fingerprint serial (RX, TX)
FPC1020 Finger(&swSerial);
void setup(){
Serial.begin(19200);
pinMode(4, INPUT); // IRQ
Serial.println("Fingerprint Test ! ");
}
void loop(){
unsigned int User_ID = 0;
unsigned char incomingNub;
unsigned int matchUserID = 0;
unsigned char rtf = 0;
while(1){
Serial.println("============== Menu ================");
Serial.println("Add a New User ----------------- 1");
Serial.println("Fingerprint Matching --------------- 2");
Serial.println("Get User Number and Print All User ID ------ 3 ");
Serial.println("Delete Assigned User --------- 4");
Serial.println("Delete All User ---------- 5");
Serial.println("============== End =================");
unsigned char MODE = 0;
while(Serial.available()<=0);
MODE = Serial.read()-0x30;
switch(MODE){
case 0: // Null
break;
case 1: // Fingerprint Input and Add a New User
MODE = 0;
User_ID = 0;
Serial.println("Please input the new user ID (0 ~ 99).");
while(Serial.available()<=0);
delay(100);
incomingNub = Serial.available();
for(char i=incomingNub; i>=1; i--){
User_ID = User_ID + (Serial.read()-0x30)*pow(10,(i-1));
}
Serial.println("Add Fingerprint, please put your finger on the Fingerprint Sensor.");
rtf = Finger.Enroll(User_ID);
if(rtf == TRUE) {
Serial.print("Success, your User ID is: ");
Serial.println( User_ID , DEC);
}
else if (rtf == FALSE) {
Serial.println("Failed, please try again.");
}
else if( rtf == ACK_USER_OCCUPIED){
Serial.println("Failed, this User ID alread exsits.");
}
else if( rtf == ACK_USER_EXIST){
Serial.println("Failed, this fingerprint alread exsits.");
}
delay(2000);
break;
case 2: // Fingerprint Matching
MODE = 0 ;
Serial.println("Mctch Fingerprint, please put your finger on the Sensor.");
if( Finger.Search()){
Serial.print("Success, your User ID is: ");
Serial.println( l_ucFPID, DEC);
}
else {
Serial.println("Failed, please try again.");
}
delay(1000);
break;
case 3: // Print all user ID
MODE = 0;
if(Finger.PrintUserID()){
Serial.print("Number of Fingerprint User is:");
unsigned char UserNumb;
UserNumb = (l_ucFPID-2)/3;
Serial.println(UserNumb,DEC);
Serial.println("Print all the User ID:");
for(char i = 0; i < UserNumb; i++){
Serial.println(rBuf[12+i*3],DEC);
}
}
else {
Serial.println("Print User ID Fail!");
}
delay(1000);
break;
case 4: // Delete Assigned User ID
MODE = 0;
User_ID = 0;
Serial.println("Please input the user ID(0 ~ 99) you want to delecte.");
while(Serial.available()<=0);
delay(100);
incomingNub = Serial.available();
for(char i=incomingNub; i>=1; i--){
User_ID = User_ID + (Serial.read()-0x30)*pow(10,(i-1));
}
if(Finger.Delete(User_ID)) {
Serial.println("Delete Fingerprint User Success!");
}
else{
Serial.println("Delete Fingerprint User Fail!");
}
delay(1000);
break;
case 5: // Delete All User ID
MODE = 0;
unsigned char DeleteFlag = 0;
Serial.println("Delete All Users, Y/N ?");
for(unsigned char i=200; i>0; i--)//wait response info
{
delay(20);
if(Serial.available()>0)
{
DeleteFlag = Serial.read();
break;
}
}
if(DeleteFlag == 'Y'||'y'){
if(Finger.Clear()){
Serial.println("Delete All Fingerprint User Success!");
}
else{
Serial.println("Delete All Fingerprint User Fail!");
}
}
delay(500);
break;
}
}
}`
i tried changing it to use the default tx and rx pins but i cant because of serial monitor. plus i dont think its the issue, but im not receiving anything from the module, not even an error. you can find the library here,https://forum.arduino.cc/uploads/short-url/6jG6HgW83Cg6uXYBjnnrqXEjX6n.zip in the name it says fpc-1020 btu i figured it would work with 1020a and its the only library that works with arduino uno so i didnt really have a choice. i found these infos from this forum: How to use FPC1020A Capacitive Fingerprint Identification Module with Arduino | Andrey Ovcharov
) and in arduino to detect it i actually had to set the min trigger voltage update to 3.7v and even then it flickers but if i go higher it doesnt work anymore, this is very weird as it is as if the module is constantly sending 3.6v but thats not what the multimeter says, might be a problem with the arduino board. Will update.