Raspberry Pi - Arduino - Link the two serial / UART

To receive data in 433Mz on the Raspberry Pi, you can use different libraries but all use almost 100% of the CPU 100% (If you know one that does not I'm interested in !). Then a solution is through an Arduino which will send us the valid data on serial port.

I continue to progress slowly on my project PI Home Connect, and therefore continued to my article on the creation of a node, It is necessary to receive data. Using for the moment a 433Mz transmission should therefore be able to receive messages from my probe. The reception directly on the Raspberry using the CPU has (almost) its maximum, I chose to use an Arduino.

As I didn't have multiple power sources, I found the excellent article from Jared Wolff on a quick and easy connection between the two :

This is how with 4 wires connect the two. Thanks Jared !!

To exploit the communication between the two you need to disable the extra console on the Raspberry Pi :

• Updating your system

  apt-get update && apt-get upgrade

• Install if necessary raspi-config

  apt-get install raspi-config

• Run raspi-config and select the following steps :
  
• Restart Raspberry Pi

Now you can communicate with your Arduino on the serial port. For the Raspberry you can use a program in Python for example :

import serial
import sys
import string
ser = serial.Serial('/dev/ttyAMA0', 115200)
while True :
    try:
    	# Read data incoming on the serial line
        data=ser.readline()
        print data
    except:
    	print "Unexpected error:", sys.exc_info()
    	sys.exit()

And on the Arduino :

void setup() {
  Serial.begin(115200);
}
void loop() {
  Serial.println("Hello");
  delay(1000);
}