The Manchester code data written to arduino board using python can see the flipped output on the RX pin

[ranjithaprasanna]

HI ,

I have written the code to send hex value to the Arduino board serially , and the hex data is converted to Manchester formate and then sent to ARduino board .
But when i tap the receiver pin on the arduino board using Pico scope can see the 8 bits data splitted in to nibbles and each nibble is flipped and an additional bit is added b/w each nibble . Can you please help me where I am doing wrong , I have given print statement in the python , in python can see the encoded and decoded byte is printing correct value ,now i can see the issue only when i check the data on the RX pin data is corrupted.
Need help on this matter pls
import typing

import serial

import time

import manchester_code

type or paste code here

def send_data_to_arduino(encoded_data):
arduino_port='COM4'
baud_rate=19200
with serial.Serial(arduino_port,baud_rate,timeout=1) as ser:
time.sleep(2)
ser.write(encoded_data)

#data_to_send1 = bytearray(b'\x15\x16\x00\x00\x77\x7C\xFA\xCC\xF4\xA4\x7C\x81') # Frame 1
data_to_send1 = bytearray(b'\x00\x11') # Frame 1
#data_to_send =bytearray(b'\x17') # note in the picoscope binary value is it shown as 1000001110- need to check what issue is
#data_to_send2 = bytearray(b'\x15\x16\x00\x00\x77\x7C\xFA\xCC\xF4\xA4\x7C\x81') # Frame 2
data_to_send2 = bytearray(b'\x00\x12') # Frame 2
try:
while True:
delay =0.1
############################## sending frame 1 ##############################
encoded_data1 =manchester_code.encode(data_to_send1)
send_data_to_arduino(encoded_data1)
print(''.join(['{:08b}'.format(m) for m in encoded_data1])) # this is to print the hex data converted to machester in to binary format.
print("Encoded Data1 : ",encoded_data1 )
delay=0.12
############################# sending frame 2 ####################################
encoded_data2 =manchester_code.encode(data_to_send2)
send_data_to_arduino(encoded_data2)
print(''.join(['{:08b}'.format(m) for m in encoded_data2])) # this is to print the hex data converted to machester in to binary format.
print("Encoded Data2 : ",encoded_data2 )

  #############################  decoding  frame 1 ######################################  
  decoded_data1=manchester_code.decode(encoded_data1)

---

Result in the terminal
Received data in binary1: 00000000 00010001
Decoded_Data 2: b'\x00\x12'
Received data in binary2: 00000000 00010010
01010101010101010101011001010110
Encoded Data1 : b'UUVV'
01010101010101010101011001011001
Encoded Data2 : b'UUVY'
Decoded_Data 1: b'\x00\x11'
Received data in binary1: 00000000 00010001
Decoded_Data 2: b'\x00\x12'
Received data in binary2: 00000000 00010010

And on the Arduino side I am using the below code

type or paste code here

void setup() {
Serial.begin(19200);

}

void loop() {

while( Serial.available()>0)
{

char receivedData= Serial.read();
Serial.print("Received : ");
Serial.println(receivedData);
}
}

[pert]

I moved your topic to an appropriate forum category @ranjithaprasanna.

In the future, please take some time to pick the forum category that best suits the subject of your topic. There is an "About the _____ category" topic at the top of each category that explains its purpose.

This is an important part of responsible forum usage, as explained in the "How to get the best out of this forum" guide. The guide contains a lot of other useful information. Please read it.

Thanks in advance for your cooperation.