I’ve written some code to communicate between two Raspberry Pi’s, using identical HC-12 433Mhz transceivers. I was able to successfully echo between the two Pi’s using a direct serial connection and
cat, however am unable to replicate this using HC-12s, which theoretically work by a similar principal. I’m using the port
ttyAMA0 on both for this example, but
ttyS0 is also available and have tried every combination of these ports.
The following code is common to both the sending and receiving, just writing once for sake of brevity:
import serial import time ser = serial.Serial( port = "/dev/ttyAMA0", baudrate = 9600, parity = serial.PARITY_NONE, stopbits = serial.STOPBITS_ONE, bytesize = serial.EIGHTBITS ) print("Serial status: " + str(ser.isOpen()))
This is the sending program:
while True: print("Sending...") ser.write("hellon".encode()) time.sleep(1)
And the receiving program:
while True: print("Receiving...") data = ser.readlines() print(data.decode())
The sending program simply loops as expected, but the receiver prints "Receiving…", and then nothing.
When I keyboard interrupt the receiving program at that point, it says it is currently up to
data = ser.readlines().
Any help would be much appreciated – I’ve spent the better part of the last week trawling and exhausting forums and READMEs to no avail, and this is literally my last option. Am close to insanity on this one!