Initial commit

gate.py

@@ -0,0 +1,54 @@
+import pigpio
+import time
+import logging
+import json
+
+from wiegand import decoder
+
+class gate:
+  def __init__(self, pi, relay_pin):
+    self.pi = pi
+    self.relay_pin = relay_pin
+
+    # set the pin to high to keep the gate locked
+    pi.write(relay_pin, 1)
+
+  # unlocks the gate for a number of seconds defined by timeout
+  def unlock_gate(self, timeout):
+    self.pi.write(self.relay_pin, 0)
+    time.sleep(timeout)
+    self.pi.write(self.relay_pin, 1)
+
+def load_secrets():
+    with open("./secrets.json") as secrets:
+        return json.loads(secrets.read())
+
+if __name__ == "__main__":
+  secrets = load_secrets()
+  pi = pigpio.pi()
+  gate = gate(pi, 4)
+
+  current_code = ""
+  def callback(bits, value):
+    global current_code
+    # indicates keypad press
+    if bits == 4:
+      current_code = current_code[-3:] + str(value)
+      if len(current_code) == 4:
+        # check if we have a valid code
+        if current_code in secrets['codes']:
+          gate.unlock_gate(5)
+        current_code = ""
+    # indicates a card swipe
+    elif bits == 37:
+      current_code = ""
+      str_value = str(value)
+      if str_value in secrets['cards']:
+        gate.unlock_gate(5)
+
+    logging.info("bits={} value={}".format(bits, value))
+
+  w = decoder(pi, 2, 3, callback)
+  time.sleep(1000)
+  w.cancel()
+  pi.stop()