add single read function

peaktech.py

@@ -61,16 +61,16 @@ def crap_to_number(num, unit, acdc):
 
 
 def read_peaktech( ser ):
+
                 line = ser.read_until( b'\xf1' )
                 #print(binascii.hexlify(line))
-
                 good=1
                 if(len(line) == 15):
                     for i in range(0, 0xf):
                         if i+1 != ((line[i]&0xF0)>>4):
                             good=0
                 else:
-                    good=0
+                    line = ser.read_until( b'\xf1' )
 
                 bytearr = bytearray(line)
 
@@ -161,6 +161,15 @@ def read_peaktech( ser ):
 
                 #    print( f"{value}{prefix}{unit}" )
 
+def read():
+    ser = Serial("/dev/ttyUSB0", 2400)
+    res = read_peaktech(ser)
+    try:
+        res = int(res)
+    except:
+        res = 0
+    return res
+
 if __name__  == "__main__":
     port = "/dev/ttyUSB0"