json

ard.py

@@ -2,22 +2,30 @@ import uvicorn
 from serial import Serial
 import threading
 from fastapi import FastAPI
-
-s=""
-
+import json
 ser = Serial('COM6', 9600)
-def pot():
-    global s
-    while True:  
-        s = ser.read(1)       # read up to one hundred bytes
-th=threading.Thread(target=pot)
-th.start()
+data = {"value": 0}
+
+def read_data():
+    global data
+    while True:
+        incoming_data = ser.read(1)  # read up to one byte
+        try:
+            data["value"] = int(incoming_data)
+        except ValueError:
+            pass
+
 app = FastAPI()
 
+def get_data():
+    return json.dumps(data)
+
+th = threading.Thread(target=read_data)
+th.start()
+
 @app.get("/")
 async def root():
-    return ("message", s)
-
+    return data
 
 if __name__ == "__main__":
     uvicorn.run(app, port=10000)