Adafruit-Fingerprint-Sensor-Library

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• Arduino board: MEGA 2560
• Arduino IDE version: 1.8.19
• Sensor GROW R503
• Adafruit fingerprint sensor library version: 2.0.7

So the problem I'm seeing is that this library doesn't work well when using a real uart (1) or any real uart (1,2,3) on arduino mega 2560 at the default baudrate (57600). It never finds my sensor. I didn't try to lower the baudrate...

I also found that it successfully sends the commands to the FP reader, but it fails to receive the responses! For example: if you add this line: finger.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_BLUE); the leds always turn on, which means that the sensor successfully receives the command.

However, the library works well when using softserial (on arduino uno and mega) at the same baudrate.

There is a bit modififed code that doesnt't work when using MEGA 2560 with sensor R503: (it's the example from the library for reading and verifying the fingerprints)

` #include <Adafruit_Fingerprint.h> #define mySerial Serial1

Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

void setup() { Serial.begin(9600); while (!Serial); // For Yun/Leo/Micro/Zero/... delay(100); Serial.println("\n\nAdafruit finger detect test");

// set the data rate for the sensor serial port finger.begin(57600);

Serial.println(F("Reading sensor parameters")); finger.getParameters(); Serial.print(F("Status: 0x")); Serial.println(finger.status_reg, HEX); Serial.print(F("Sys ID: 0x")); Serial.println(finger.system_id, HEX); Serial.print(F("Capacity: ")); Serial.println(finger.capacity); Serial.print(F("Security level: ")); Serial.println(finger.security_level); Serial.print(F("Device address: ")); Serial.println(finger.device_addr, HEX); Serial.print(F("Packet len: ")); Serial.println(finger.packet_len); Serial.print(F("Baud rate: ")); Serial.println(finger.baud_rate);

finger.getTemplateCount();

if (finger.templateCount == 0) { Serial.print("Sensor doesn't contain any fingerprint data. Please run the 'enroll' example."); } else { Serial.println("Waiting for valid finger..."); Serial.print("Sensor contains "); Serial.print(finger.templateCount); Serial.println(" templates"); } }

void loop() // run over and over again { getFingerprintID(); delay(50); //don't ned to run this at full speed. }

uint8_t getFingerprintID() { uint8_t p = finger.getImage(); switch (p) { case FINGERPRINT_OK: Serial.println("Image taken"); break; case FINGERPRINT_NOFINGER: Serial.println("No finger detected"); return p; case FINGERPRINT_PACKETRECIEVEERR: Serial.println("Communication error"); return p; case FINGERPRINT_IMAGEFAIL: Serial.println("Imaging error"); return p; default: Serial.println("Unknown error"); return p; }

// OK success!

p = finger.image2Tz(); switch (p) { case FINGERPRINT_OK: Serial.println("Image converted"); break; case FINGERPRINT_IMAGEMESS: Serial.println("Image too messy"); return p; case FINGERPRINT_PACKETRECIEVEERR: Serial.println("Communication error"); return p; case FINGERPRINT_FEATUREFAIL: Serial.println("Could not find fingerprint features"); return p; case FINGERPRINT_INVALIDIMAGE: Serial.println("Could not find fingerprint features"); return p; default: Serial.println("Unknown error"); return p; }

// OK converted! p = finger.fingerSearch(); if (p == FINGERPRINT_OK) { Serial.println("Found a print match!"); } else if (p == FINGERPRINT_PACKETRECIEVEERR) { Serial.println("Communication error"); return p; } else if (p == FINGERPRINT_NOTFOUND) { Serial.println("Did not find a match"); return p; } else { Serial.println("Unknown error"); return p; }

// found a match! Serial.print("Found ID #"); Serial.print(finger.fingerID); Serial.print(" with confidence of "); Serial.println(finger.confidence);

return finger.fingerID; }

// returns -1 if failed, otherwise returns ID # int getFingerprintIDez() { uint8_t p = finger.getImage(); if (p != FINGERPRINT_OK) return -1;

p = finger.image2Tz(); if (p != FINGERPRINT_OK) return -1;

p = finger.fingerFastSearch(); if (p != FINGERPRINT_OK) return -1;

// found a match! Serial.print("Found ID #"); Serial.print(finger.fingerID); Serial.print(" with confidence of "); Serial.println(finger.confidence); return finger.fingerID; } `