Merge pull request #500 from s2terminal/fix-analog-read

 fix analogRead not returning a value

Other users have found this fix also works for them. Thank you for your contribution

Author: CleoQc

Software/Python/grovepi.py

@@ -238,7 +238,7 @@ def read_i2c_block(no_bytes = max_recv_size):
 
 def read_identified_i2c_block(read_command_id, no_bytes):
 	data = [-1]
-	while data[0] != read_command_id[0]:
+	while len(data) <= 1:
 		data = read_i2c_block(no_bytes + 1)
 
 	return data[1:]