First script: reads weight from scale

mts-iot-apps/OpenMts.AutomaticCheckIn/AutomaticCheckIn.py

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+import time
+import serial
+import RPi.GPIO as GPIO
+import sys
+import configparser
+sys.path.append('/home/pi/MFRC522-python')
+from mfrc522 import SimpleMFRC522
+
+def connect_to_scale(port):
+  ser = serial.Serial("/dev/ttyUSB0", timeout=1)
+  return ser
+
+def convert_value(scale_response):
+  low = int(scale_response.find(' ')+1)
+  high = int(scale_response.find('k'))
+  quantity = float(scale_response[low:high])
+  return quantity
+
+# Get config
+config = configparser.ConfigParser()
+config.read('./config.ini')
+print(config.sections())
+server = config["Server"]["Endpoint"]
+apiKey = config["Server"]["ApiKey"]
+scalePort = config["Scale"]["UsbPort"]
+
+# Output config
+print("Configuration:")
+print(" + Server: " + server)
+print(" + API-Key: " + apiKey)
+print(" + Scale USB port: " + scalePort)
+
+# Start reading
+reader = SimpleMFRC522()
+print("Pleace hold material-card next to the reader")
+try:
+  while True:
+    id, matnr_card = reader.read()
+    ser = connect_to_scale(scalePort)
+
+    # Get weight
+    raw_decode = bytes('S','utf-8')
+    ser.write(raw_decode)
+    scale_response = ser.readline()
+    print(scale_response)
+    quantity = convert_value(str(scale_response))
+    weight_formated = '{0:0.2f}'.format(quantity)
+    print(" - Read weight: " + str(quantity) + )
+    time.sleep(1)
+    print("Pleace hold material-card next to the reader")
+except KeyboardInterrupt:
+  GPIO.cleanup()
+except Exception as exception:
+  print(exception)
+  GPIO.cleanup()

mts-iot-apps/OpenMts.AutomaticCheckIn/README.md

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+# AutomaticCheckIn
+
+Tested on a Raspberry Pi 4 Model B.
+
+## Installation
+
+### Python Packages
+
+Install on Raspberry Pi:
+
+- [MFRC522-python](https://github.com/pimylifeup/MFRC522-python)
+
+Install on Raspberry Pi with pip3:
+
+- `pyserial`

mts-iot-apps/OpenMts.AutomaticCheckIn/config.ini

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+[Server]
+Endpoint = "http://localhost:5000"
+ApiKey = "todo"
+
+[Scale]
+UsbPort = "/dev/ttyUSB0"