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Topic: arduino smooth pot after change adc reference to internal (Read 33 times) previous topic - next topic

lamineovich

hi,
in order to make pc steering wheel i am using arduino and multiturn pot
i used 1.1V  ADC in order to equilibrate between pot rotation and value of bits
but after changing analog reference to INTERNAL , the pot is jumpy and i cant use it correctly
how can i make the smoother

there is the code that i use :


Code: [Select]




#undef DEBUG

#define NUM_BUTTONS  40 // you don't need to change this value
#define NUM_AXES  8 // 6 axes to UNO, and 8 to MEGA. If you are using UNO, don't need to change this value.

typedef struct joyReport_t {
int16_t axis[NUM_AXES];
uint8_t button[(NUM_BUTTONS+7)/8]; // 8 buttons per byte
} joyReport_t;

joyReport_t joyReport;

uint8_t btn[12];
int fulloff = 0;
void setup(void);
void loop(void);
void setButton(joyReport_t *joy, uint8_t button);
void clearButton(joyReport_t *joy, uint8_t button);
void sendJoyReport(joyReport_t *report);

void setup()
{
//set pin to input Button
for( int portId = 02; portId < 13; portId ++ )
{
pinMode( portId, INPUT_PULLUP);
}
Serial.begin(115200);
delay(200);

for (uint8_t ind=0; ind<8; ind++) {
joyReport.axis[ind] = ind*1000;
}
for (uint8_t ind=0; ind<sizeof(joyReport.button); ind++) {
joyReport.button[ind] = 0;
}
}

// Send an HID report to the USB interface
void sendJoyReport(struct joyReport_t *report)
{
#ifndef DEBUG
Serial.write((uint8_t *)report, sizeof(joyReport_t));
#else
// dump human readable output for debugging
for (uint8_t ind=0; ind<NUM_AXES; ind++) {
Serial.print("axis[");
Serial.print(ind);
Serial.print("]= ");
Serial.print(report->axis[ind]);
Serial.print(" ");
}
Serial.println();
for (uint8_t ind=0; ind<NUM_BUTTONS/8; ind++) {
Serial.print("button[");
Serial.print(ind);
Serial.print("]= ");
Serial.print(report->button[ind], HEX);
Serial.print(" ");
}
Serial.println();
#endif
}

// turn a button on
void setButton(joyReport_t *joy, uint8_t button)
{
uint8_t index = button/8;
uint8_t bit = button - 8*index;

joy->button[index] |= 1 << bit;
}

// turn a button off
void clearButton(joyReport_t *joy, uint8_t button)
{
uint8_t index = button/8;
uint8_t bit = button - 8*index;

joy->button[index] &= ~(1 << bit);
}

/*
* Read Digital port for Button
* Read Analog port for axis
*/
void loop()
{
// Create Matriz with value off switch button
for(int bt = 1; bt < 13; bt ++)
{
btn[bt]= digitalRead(bt+1);
}
// Power ON button if it is press. buton 17 at 28
for(int on=01; on < 13; on++)
{
if (btn[on] == LOW)
{
setButton(&joyReport, on+16);
// Serial.println("botao ON");
// Serial.println(on+16);
}else{
fulloff = fulloff++;
} //Power off all Button, if all button are not press
if(fulloff == 13)
{
for(uint8_t cont=0; cont<40; cont++)
{
clearButton(&joyReport, cont);
}
// Serial.println("Every buttons is off");
}
}

/* Move all of the Analogic axis */
/* Arduino UNO have only 6 port. Will be necessary set to 0; the not used port */
/* In this example, i will use just 3 axis. X, Y, Z */
/* if you will use all 6 analog ports, set axis < 3, to axis < 5 */
for (uint8_t axis = 0; axis < 3; axis++) {
joyReport.axis[axis] = map(analogRead(axis), 0, 1023, -32768,32767 );
}
//Set to 0; the not used analog port.
//if you will use all 6 analog ports, exclude the lines, axis[3] at axis [5] */
joyReport.axis[3] = 0;
joyReport.axis[4] = 0;
joyReport.axis[5] = 0;
joyReport.axis[6] = 0;
joyReport.axis[7] = 0;
joyReport.axis[8] = 0;

analogreference (internal)


//Send Data to HID
sendJoyReport(&joyReport);

delay(100);
fulloff = 0;
}



CrossRoads

Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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