Hello,
I've been stuck for hours trying to figure out how to get my finger print sensor to work. I'm using a ESP32NodeMCU, programmed through the ArduinoIDE. I'm simply trying to run the example code that comes along with it but nothing is being output on the serial monitor. I have a suspicion that the issue resides with the Wire.h library/ I2C bus. I've added 2k, 4.6k, 10k pull ups the SDA/ SCL as required for the ESP32 (only reasonable resistor sizes I had) but neither option has changed the result. I've checked the wiring numerous times and I've even tried the code on a back up sensor I brought just in case. I just have no idea why it isn't working. I'll included a weird error message I get along with the example code they provide. I'll also link the github page: GitHub - DFRobot/DFRobot_ID809_I2C.
One thing about the error message is the code compiles and still uploads but clearly something isn't right.
Error message:
Example code (To recieve basic information about the sensor):
/*!
* @file getDeviceInformation.ino
* @brief Get fingerprint module information
* @details Experiment Phenomenon：serial print module ID, security level, baud rate, etc.
* @copyright Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
* @License The MIT License (MIT)
* @author [Eddard](Eddard.liu@dfrobot.com)
* @version V1.1
* @date 2020-03-19
* @url https://github.com/DFRobot/DFRobot_ID809_I2C
*/
#include <DFRobot_ID809_I2C.h>
DFRobot_ID809_I2C fingerprint;
//DFRobot_ID809_UART fingerprint(115200);
//String desc;
void setup(){
/*Init print serial port */
Serial.begin(9600);
/*Take FPSerial as communication port of the module*/
fingerprint.begin();
/*Wait for Serial to open*/
while(!Serial);
/*Test whether device can communicate properly with mainboard
Return true or false
*/
while(fingerprint.isConnected() == false){
Serial.println("Communication with device failed, please check connection");
/*Get error code information */
//desc = fingerprint.getErrorDescription();
//Serial.println(desc);
delay(1000);
}
}
uint8_t enrollCount; //Number of registered users
void loop(){
/*Set module ID, available range: 1-255*/
//fingerprint.setDeviceID(/*Device ID = */1);
Serial.print("Module ID:");
/*Read module ID*/
Serial.println(fingerprint.getDeviceID());
/*Set module security level, range 1-5. Default level: 3
Security Level Recognition rate
Level 1 FAR 0.1%
FRR 0.005%
Level 2 FAR 0.003%
FRR 0 01%
Level 3 FAR 0.001%
FRR 0.1%
Level 4 FAR 0.003%
FRR 0.5%
Level 5 FAR 0.0001%
FRR 1%
*/
//fingerprint.setSecurityLevel(/*Security Level = */3);
Serial.print("Module security level:");
/*Read module security level*/
Serial.println(fingerprint.getSecurityLevel());
/*Set module baud rate, available range:
e9600bps e19200bps e38400bps e57600bps e115200bps
1 2 3 4 5
*/
//fingerprint.setBaudrate(fingerprint.e115200bps);
Serial.print("Module baud rate: ");
/*Read module baud rate*/
Serial.println(fingerprint.getBaudrate());
/*Set module self-learning function, 1(ON) 0(OFF)*/
//fingerprint.setAutoLearn(/*Auto Learn = */1);
Serial.print("Module self-learning function: ");
/*Read the state of module self-learning function
Print ON if it is enabled, otherwise print OFF */
Serial.println(fingerprint.getSelfLearn()?"ON":"OFF");
/*Set module serial number, the number of characters of serial number should be small than 15 */
//fingerprint.setModuleSN(/*Module SN = */"DFRobot");
Serial.print("Module serial number:");
/*Read module serial number */
Serial.println(fingerprint.getModuleSN());
Serial.print("Number of registered fingerprints in the module:");
/*Get the number of registered users */
Serial.println(enrollCount = fingerprint.getEnrollCount());
/*Declare an array to hold ID list */
uint8_t list[80] = {0};
/*Get user list
*/
fingerprint.getEnrolledIDList(list);
Serial.print("ID list of registered users: ");
for(uint8_t i = 0; i < enrollCount; i++){
Serial.print(list[i]);
Serial.print(",");
}
Serial.print("\nNumber of broken fingerprints:");
/*Get the number of broken fingerprints */
Serial.println(fingerprint.getBrokenQuantity());
/*Get the ID of the first broken fingerprint*/
//fingerprint.getBrokenID();
Serial.println("-----------------------------");
delay(1000);
}
