I2C: UNO Master, Micro Slave & servo trouble.

hey, guys. zz cat here. =^/.^=

so, i've got idea i'm usin' uno read values off pot, send micro down i2c bus & micro converts value signal pulse attached servo.

so! problem: twitching.
i've checked serial monitor & it's goin' 0 44 & looping through that, despite figure being mapped 0-1023 0-179.

the first code document master transmitter i've written arduino uno:

code: [select]

/*
                        \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\/
                        ////////////////////////////////////////\/
                        /\ arduino i2c servo controller(master) \/
                        /\                v1.0.0                \/
                        /\                                      \/
                        /\             designed by:             \/
                        /\    cudby Æronautics international    \/
                        /\////////////////////////////////////////
                        /\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

description:
  i2c serial-based servo controller using arduino's uno & micro. uno configured master/writer & micro configured slave/receiver.
  uno converts analog values of attached pot serial value & transmits value micro. micro converts received serial value pwm signal
  turn servo according position of potentiometer that's attached uno.

the circuit:
  uno:
    > either powered usb lead or vin jack.
    > leg 1 of pot connected a0 & pulled high.
    > leg 2 of pot connected a1 & analog values read pin.
    > leg 3 of pot connected a2 & pulled low.
    > a4 (uno) connected d2 (micro) 4k7 pull-up resistor on sda bus line.
    > a5 (uno) connected d3 (micro) 4k7 pull-up resistor on scl bus line.
  micro:
    > powered usb lead.
    > d2 (micro) connected a4 (uno).
    > d3 (micro) connected a5 (uno.
    > d4 connected sig lead of servo.
    > + lead of servo connected 5v pin.
    > - lead of servo connected gnd pin.
*/

// libraries:
#include <wire.h>                                              // add use of i2c library. #hashtagsaregay

// digital i/o pins:
const int pothighpin = a0;                                     // leg 1 of pot connected adc0.
const int potlowpin = a2;                                      // leg 3 of pot connected adc2.

// adc pin:
const int potwiperpin = a1;                                    // leg 2 of pot connected adc1.

void setup() {
  serial.begin(9600);                                          // start serial monitor @ 9600baud.
  wire.begin();                                                // start i2c bus. address not needed master device.
 
  // pot properties:
  pinmode(pothighpin, output);                                 // configure leg 1 of pot output.
  pinmode(potlowpin, output);                                  // configure leg 3 of pot output.
  digitalwrite(pothighpin, high);                              // drive leg 1 of pot high.
  digitalwrite(potlowpin, low);                                // drive leg 3 of pot low.
}

void loop() {
  byte swep = analogread(potwiperpin);                         // read wiper position analog value.
  wire.begintransmission(4);                                   // transmit device #4.
  wire.write(swep);                                            // send 4 bytes.
  wire.endtransmission();                                      // stop transmitting.
}

the second code document slave receiver i've written arduino micro:

code: [select]

/*
                        \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\/
                        ////////////////////////////////////////\/
                        /\ arduino i2c servo controller (slave) \/
                        /\                v1.0.0                \/
                        /\                                      \/
                        /\             designed by:             \/
                        /\    cudby Æronautics international    \/
                        /\////////////////////////////////////////
                        /\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

description:
  i2c serial-based servo controller using arduino's uno & micro. uno configured master/writer & micro configured slave/receiver.
  uno converts analog values of attached pot serial value & transmits value micro. micro converts received serial value pwm signal
  turn servo according position of potentiometer that's attached uno.

the circuit:
  uno:
    > either powered usb lead or vin jack.
    > leg 1 of pot connected a0 & pulled high.
    > leg 2 of pot connected a1 & analog values read pin.
    > leg 3 of pot connected a2 & pulled low.
    > a4 (uno) connected d2 (micro) 4k7 pull-up resistor on sda bus line.
    > a5 (uno) connected d3 (micro) 4k7 pull-up resistor on scl bus line.
  micro:
    > powered usb lead.
    > d2 (micro) connected a4 (uno).
    > d3 (micro) connected a5 (uno.
    > d4 connected sig lead of servo.
    > + lead of servo connected 5v pin.
    > - lead of servo connected gnd pin.
*/

// libraries:
#include <servo.h>                                             // add use of servo library.
#include <wire.h>                                              // add use of i2c library. #hashtagsaregay

// servos:
servo not_a_servo;                                             // create servo called "not servo."

void setup() {
  serial.begin(9600);                                          // start serial monitor @ 9600baud.
  wire.begin(4);                                               // start i2c bus device #4.
  wire.onreceive(receiveevent);                                // register event.
 
  not_a_servo.attach(4);                                       // attach sig lead d4.
}

void loop() {
 
}

void receiveevent(int range) {
  if (wire.available()) {                                      // if there's data available @ i2c port...
    int swep = wire.read();                                    // read received data integer.
    swep = map(swep, 0, 1023, 0, 180);                         // map recieved data sweep range.
    not_a_servo.write(swep);                                   // turn servo horn according recieved data.
    serial.println(swep);                                      // transmit sweep angle serial monitor.
  }
}

first screenie bottom end. ie when pot @ it's lowest point:


second screenie "top end" when turn pot 1/8 of way up:


third & final screenie: here's happens if turn pot higher up...


so, that's suspect causing twitching. question is... can fix this?

what "screenie"s?

why isn't int?
byte swep = analogread(potwiperpin);                         // read wiper position analog value.


how send 4 bytes?
  wire.write(swep);                                            // send 4 bytes.

swep 1 byte


on receive side
    swep = map(swep, 0, 1023, 0, 180);                         // map recieved data sweep range.


how can 1023 come in when said swep byte (0-255) in original read?

Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > I2C: UNO Master, Micro Slave & servo trouble.

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