UDP conexión raspberry to arduino.

Projects Programming
1

his is my code
When there are changes of value in the rasberry it is not updated immediately in arduino the previous value is maintained for a moment. how to fix it

input signal is a constant
#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>

int led1 = 6;
int led2 = 7;
//DIRECION MAC DEL ETHERNET
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

IPAddress ip(169,254,0,55);

unsigned int localPort = 42500;

EthernetUDP Udp;

byte packetBuffer [UDP_TX_PACKET_MAX_SIZE];
byte ReplyBuffer []="acknowledged";

void setup(){
Ethernet.begin(mac,ip);
Udp.begin(localPort);
Serial.begin(9600);
pinMode (6,OUTPUT);
pinMode (7,OUTPUT);
}

void loop(){

int packetSize = Udp.parsePacket();
if (packetSize>0){
Serial.print("Recibido mensaje de tamaño ");
Serial.println(packetSize);
Serial.print("From ");

IPAddress remote = Udp.remoteIP();
for (int i=0; i < 4; i++) {
Serial.print(remote, DEC);
if (i < 3) {
Serial.print(".");
}
}

Serial.print(", port ");
Serial.println(Udp.remotePort());

Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
Serial.print("Contenido:");

int a1=packetBuffer[0];
Serial.print(a1);
if (a1==30) {

digitalWrite(led1 , HIGH);
delay(1000);
digitalWrite(led1 , LOW);
delay(1000);}
else {
if (a1==40) {
digitalWrite(led2 , HIGH);
delay(1000);
digitalWrite(led2 , LOW);
delay(1000);

}} }

delay(100);
}

2

Why did you start another thread on the same topic?

Your code indenting is horrid. Put EVERY { on a line by itself. Put every } on a line BY ITSELF. Use Tools + Auto Format to properly indent your code.

Then, ask yourself what a packet size of 0 means. When the packet size is 0, does it make sense to read the packet?

And, forget about writing responsive code when you litter your code with delay()s.