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Initial commit

Thomas Buck 2 years ago
commit
53f9393700
1 changed files with 113 additions and 0 deletions
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      RFID-Door.ino

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RFID-Door.ino View File

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+/*
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+  Very simple RFID Door Opener
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+
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+  Input: RFID Antenna, outputs TLL UART level, 9600 8N1, 5bytes ID in binary
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+  Input: pushbutton to activate output
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+  Output: Relais connected to Solenoid controlling door lock
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+*/
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+
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+#include <SoftwareSerial.h>
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+
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+#define DOOR_OPEN LOW /* when correct id transmitted */
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+#define DOOR_CLOSED HIGH /* idle or after timeout */
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+#define DOOR_OPEN_TIME (2 * 1000) /* how long to keep door open with rfid tag */
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+#define DOOR_OPEN_TIME_MANUAL (1 * 1000) /* how long to keep door open with button */
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+#define BUFFER_CLEAR_TIME 250 /* bigger than time between serial input characters */
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+#define ID_LENGTH 5 /* length of ID to read and compare */
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+#define BUFFER_LEN (2 * ID_LENGTH) /* slightly longer than ID, just in case */
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+
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+// pin assignments
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+static const int rfid_rx = 5;
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+static const int door_out = 6;
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+static const int button_in = 7;
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+
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+// known RFID ID codes
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+static const unsigned char known_codes[][ID_LENGTH] = {
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+    { 0x00, 0x00, 0x00, 0x00, 0x00 },
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+    { 0x00, 0x00, 0x00, 0x00, 0x00 }
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+};
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+
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+unsigned char read_buffer[BUFFER_LEN];
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+int buffer_pos = 0;
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+unsigned long door_time = 0;
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+unsigned long manual_time = 0;
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+unsigned long buffer_time = 0;
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+SoftwareSerial rfid_serial(rfid_rx, LED_BUILTIN);
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+
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+void setup() {
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+    pinMode(rfid_rx, INPUT);
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+    pinMode(button_in, INPUT);
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+    pinMode(door_out, OUTPUT);
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+
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+    digitalWrite(door_out, DOOR_CLOSED);
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+    digitalWrite(button_in, HIGH); // enable pull-up
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+
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+    rfid_serial.begin(9600);
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+    rfid_serial.println("RFID Door initialized");
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+
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+    Serial.begin(115200);
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+    Serial.println("RFID Door initialized");
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+}
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+
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+void loop() {
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+    // read from RFID antenna
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+    if (rfid_serial.available()) {
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+        unsigned char one = rfid_serial.read();
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+        read_buffer[buffer_pos] = one;
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+        if (buffer_pos < (BUFFER_LEN - 1)) {
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+            buffer_pos++;
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+        } else {
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+            buffer_pos = 0; // reset on overflow
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+            return;
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+        }
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+
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+        // dump to USB so we can add new codes later if we need to
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+        Serial.print("Got byte: ");
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+        Serial.println(one, HEX);
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+
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+        // store time of last received byte
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+        buffer_time = millis();
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+
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+        // check for matching ID
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+        if (buffer_pos >= ID_LENGTH) {
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+            for (int o = 0; o < (buffer_pos - ID_LENGTH); o++) {
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+                for (int c = 0; c < (sizeof(known_codes) / sizeof(known_codes[0])); c++) {
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+                    int match = 1;
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+                    for (int i = 0; i < ID_LENGTH; i++) {
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+                        if (read_buffer[o + i] != known_codes[c][i]) {
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+                            match = 0;
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+                            break;
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+                        }
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+                    }
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+                    if (match) {
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+                        digitalWrite(door_out, DOOR_OPEN);
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+                        door_time = millis();
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+                        buffer_pos = 0;
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+                        buffer_time = 0;
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+                        return;
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+                    }
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+                }
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+            }
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+        }
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+    }
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+
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+    if (digitalRead(button_in) == LOW) {
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+        digitalWrite(door_out, DOOR_OPEN);
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+        manual_time = millis();
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+        door_time = 0;
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+    }
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+
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+    // if enough time without data, clear buffer
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+    if ((buffer_time != 0) && ((millis() - buffer_time) >= BUFFER_CLEAR_TIME)) {
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+        buffer_pos = 0;
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+        buffer_time = 0;
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+    }
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+
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+    // if enough time since door opened, close it
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+    if (((door_time != 0) && ((millis() - door_time) >= DOOR_OPEN_TIME))
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+            || ((manual_time != 0) && ((millis() - manual_time) >= DOOR_OPEN_TIME_MANUAL))) {
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+        digitalWrite(door_out, DOOR_CLOSED);
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+        door_time = 0;
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+        manual_time = 0;
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+    }
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+}

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