Initial commit

.gitignore

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+*.pyc
+

README.md

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+# Mail Detector
+
+## Raspberry pi part will be running:
+- https://projects.raspberrypi.org/en/projects/laser-tripwire/2
+- comms over bluetooth
+
+## Phone app will:
+- Detect comms over bluetooth
+- Send push notification if mail received
+- Have a single button that resets the Pi ("Mail picked up, alert me when more comes")
+

detect.py

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+from gpiozero import LightSensor
+import serial
+import time
+
+# LightSensor classes and methods
+## Pause until no light is detected
+	# wait_for_dark()
+# ------------------------- 
+## Pause until light is detected
+	# wait_for_light()
+# -------------------------
+## Return True if light is detected
+	# light_detected
+# -------------------------
+## Function to run when it is dark
+	# when_dark = my_function
+# -------------------------
+## Function to run when it is light
+	# when_light = my_function
+# -------------------------
+def try_send(timestamp):
+	# https://towardsdatascience.com/sending-data-from-a-raspberry-pi-sensor-unit-over-serial-bluetooth-f9063f3447af
+	# tty for bluetooth
+	ser = serial.Serial('/dev/tty.raspberrypi-SerialPort', timeout=1, baudrate=115000)
+	# flush
+	serial.flushInput();serial.flushOutput()
+        # https://www.arduino.cc/reference/en/language/functions/communication/serial/write/
+	# Send data to device
+	serial.write(F"Post received at: {timestamp}")
+	# Sleep waiting for response
+	time.sleep(2)
+	# If we received reset message from device, reset warning
+	if serial.readline().decode() == "Reset":
+		return True
+	# Else try again
+	else:
+		return False
+
+def notification_set(value):
+	timestamp = datetime.datetime.now().strftime("%H:%M:%S %m-%h-%Y")
+	print(value)
+	sent = False
+	while true:
+		# Try to send notification
+		sent = try_send(timestamp)
+		# If sent, reset notification value and break
+		if sent:
+			return True
+		# else sleep 10 sec
+		else:
+			time.sleep(10)
+
+# TODO
+#  Debug
+#  Create log
+#  Test with app / device
+
+# Should log
+	# Time post arrived
+	# Time phone was notified
+if __name__=="__main__":	
+	# Assumes connection on GPIO17
+	ldr = LightSensor(17)
+	# All values are given as float between 0 (dark) and 1 (light)
+	print(ldr.value)
+	# When it gets dark, send notification (beam broken)
+	when_dark = notification_set(ldr.value)
+