Fast communication between two arduinos

Re: fast communication between two arduinos

#9

Sep 07, 2015, 05:06 pm

Thanks guys,

At the end I re-Checked the I2C protocol and understood it can only pass Chars ether by array or singles and managed to work with the code from here: http://ift.tt/1DAeWM4
and created my version to pass a 4 digit code and it work quite fast (less than 1ms).

// Wire Master Reader int x,y; #include <Wire.h> void setup() {   Wire.begin();        // join i2c bus (address optional for master)   Serial.begin(115200);  // start serial for output } void loop() {   Wire.requestFrom(2, 6);    // request 6 bytes from slave device #2      int a = Wire.read(); // receive a byte as character      int b = Wire.read(); // receive a byte as character      int c = Wire.read(); // receive a byte as character      int d = Wire.read(); // receive a byte as character      int e = Wire.read(); // receive a byte as character if(a== 45)   x=-((b-48)*1000+(c-48)*100+(d-48)*10+e-48); else   x=(b-48)*1000+(c-48)*100+(d-48)*10+e-48;   Serial.println(x);   delay(1); }

And for the slave

// Wire Slave Sender #include <Wire.h> String inString; char A[6]; int x=0,i,val,Sign; void setup() {   Serial.begin(115200);  // start serial for output   Wire.begin(2);                // join i2c bus with address #2   Wire.onRequest(requestEvent); // register event } void loop() {   Sign=0;   val= -1234;    // Value to pass     if(val<0){ //   if value negative     val=-val;     Sign=1;}   inString = String(val,DEC);   inString.toCharArray(A,6);    if(inString.length()!=5){  // manipulation to bring carateres to the right if string is less then 5 caracteres      for(x=0; x<(5-inString.length());x++){        for(i=0;i<5;i++)           A[5-i]=A[4-i];        A[0]=48;}}         if (Sign==1)     A[0] = 45;       delay(1); } void requestEvent() { Wire.write(A); // respond with message of 6 bytes   }

Tags: info, tutorial, uav4africa