wire write values

i want have joystick connected arduino-controller, , motor connected arduino-robot.

i first trying test serial communication between 2 arduinos down serial wire. (i not plan run final project way, intend try wireless connection,, i've ordered cheap 4333mhz transmitters)


i have joystick working me when in 1 arduino. podged codes how had them,, paste codes (not working or tried), can see hoped result joystick. , down mapped motor outputs on 2 pins, connected little h-bridge breadboarded out of regular to-92 4401 transistors. motor tiny @ present, works. using joystick can go forward , backward on single motor while working code on single arduino.

i've split code slave-master , did manage communication between 2 devices,, no matter did on joystick recieved full forward power, , in serial monitor printed 255 only. ,, think did not encode motorinstruct down wire, , wire.read merely reading kind of string input or something, , being mapped 255 incidentally.

code: [select]


#include <wire.h>

int joypin = a0;


void setup() {
  // put setup code here, run once:
    wire.begin(); // join i2c bus (address optional master)
  pinmode(joypin, input);
}

void loop() {
  // put main code here, run repeatedly:
 int motorinstruct = analogread(a0);
   wire.begintransmission(8); // transmit device #8
  wire.write(motorinstruct);        // sends 5 bytes
  wire.endtransmission();    // stop transmitting
  delay (50);
}


code: [select]



#include <wire.h>

int motorpinf = 3;
int motorpinb = 5;

void setup() {
  // put setup code here, run once:
  wire.begin(8);                // join i2c bus address #8

  serial.begin(9600);           // start serial output
  pinmode(motorpinf, output);
  pinmode(motorpinb, output);
}

void loop() {
  // put main code here, run repeatedly:
 int motorinstruct = wire.read();
   motorinstruct = map (motorinstruct, 0, 1023, -255, 255);
   serial.print(motorinstruct);
 
  if (motorinstruct >= -255 && motorinstruct <= -51)
  {
    analogwrite(motorpinb, -motorinstruct);
    analogwrite(motorpinf, 0);
  }
  if (motorinstruct >= 51 && motorinstruct <=255)
  {
    analogwrite(motorpinf, motorinstruct);
    analogwrite(motorpinb, 0);
  }
  if (motorinstruct >= -50 && motorinstruct <= 50)
  {
    analogwrite(motorpinf, 0);
    analogwrite(motorpinb, 0);
  }
 
  serial.print(motorinstruct);         // print character
delay(50);
}


code: [select]

  wire.write(motorinstruct);        // sends 5 bytes
rubbish. not code does.

code: [select]

int motorinstruct = wire.read();
   motorinstruct = map (motorinstruct, 0, 1023, -255, 255);
doesn't matter whether or not there read? me.


do know else if does?

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