rs232 to ethernet , nmea router orange pi zero

afric · Published in 2018-3-4 05:32:48

Edited by afric at 2018-3-4 06:51

buy MAX3232 RS232 Serial Port To TTL and i Connected to uart 2- ttyS2 (pin4-5V,pin6-GND,pin11-UART2 RX,pin13-UART2 TX)

I use Armbian_5.35_Orangepizero_Debian_jessie_default_3.4.113

install python

sudo apt-get install python-serial python3-serial

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write the script

sudo nano read_serial.py

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#!/usr/bin/env python
import time
import serial
ser = serial.Serial(
port='/dev/ttyS2',
baudrate = 38400,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
bytesize=serial.EIGHTBITS,
timeout=1
)
counter=0
while 1:
x=ser.readline()
print x

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and i run

sudo python read_serial.py

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to see if ti works
after that i write onether script (i find it ready)

sudo nano serial_to_udp.py

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# Python script for serial to UDP communication
# Alex Olwal, 2012 03 24
# www.olwal.com
#
import serial
import sys
from socket import *
def send(msg, ip, port):
socket(AF_INET,SOCK_DGRAM).sendto(msg, (ip, port))
baud_rate = 38400
if ( len(sys.argv) == 1 ):
print "Serial-to-UDP utility | Alex Olwal, 2012, www.olwal.com"
print "Syntax: " + sys.argv[0] + " serial_port udp_ip(= 127.0.0.1) udp_port(= 5000)"
print "Example: " + sys.argv[0] + " COM20 127.0.0.1 5000"
quit()
serial_port = sys.argv[1]
if ( len(sys.argv) >= 3 ):
udp_ip = sys.argv[2]
else:
udp_ip = "127.0.0.1"
if ( len(sys.argv) >= 4 ):
udp_port = sys.argv[3]
else:
udp_port = "5000"
if ( len(sys.argv) >= 5):
printing = 1
else:
printing = 0
print "Reading from serial port: " + serial_port
print "Sending to " + udp_ip + ":" + udp_port
udp_port = int(udp_port)
s = serial.Serial( serial_port, baud_rate, timeout=1 )
while (1):
line = s.readline()
if (line != ''):
if (printing):
print line[:-1]
send( line, udp_ip, udp_port )
else:
if (printing):
print "."
s.close()

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now if you run

sudo python serial_to_udp.py

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you will take

Serial-to-UDP utility | Alex Olwal, 2012, www.olwal.com
Syntax: serial_to_udp.py serial_port udp_ip(= 127.0.0.1) udp_port(= 5000)
Example: serial_to_udp.py COM20 127.0.0.1 5000

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so run

python serial_to_udp.py /dev/ttyS2 192.168.1.100 13000 &

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and take serial data from ttyS2 and sent it to pc at port 13000

there are 2 ways to auto start on boot
the fisrt is direct config rc.local but put inside 1minute wait to find the ethernet

sudo nano /etc/rc.local

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sleep 1m
python /root/serial_to_udp.py /dev/ttyS2 192.168.1.100 13000 &

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before exit0

and the other to create a script

sudo nano /etc/init.d/serial_to_udp.sh

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#!/bin/sh
python /root/serial_to_udp.py /dev/ttyS2 192.168.1.100 13000 &

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i make it executable with

sudo chmod +x /etc/init.d/serial_to_udp.sh

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and after that run

sudo update-rc.d serial_to_udp.sh defaults

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and after that modified the rc.local

sudo nano /etc/rc.local

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write

/etc/init.d/serial_to_udp.sh
sh '/etc/init.d/serial_to_udp.sh'

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before exit0

sudo reboot

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and it worksssssssssss

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