I made me a magnetically levitated pulse motor.
The picture and
video cloud be found here.
So i thought it would be cool to run this motor with a PWM tecknik using a ARDUINO UNO R3. Before getting this unit running, i had to do some digging and run some trial and error. This unit consist of an LCD SHIELD, a HALL EFFECT SENCOR, a potentiometer, some diode, resistors, capacitors, jumpers and some other small parts.
Hers the code to make it run. Its basically two code's combined into one.
The code is not mine, but i did some alteration to make it work with the LCD to fit the jumpers.
Hopes This helps.
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// include the library code:
#include
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(8,9,4,5,6,7);
// read the hall effect sensor on pin 2
const int hallPin=2;
const int shiftLed=3;
const unsigned long sampleTime=1000;
const int maxRPM = 50200;
void setup()
{
pinMode(hallPin,INPUT);
pinMode(shiftLed,OUTPUT);
Serial.begin(9600);
// set up the LCD's number of rows and columns:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("initializing");
delay(1000);
lcd.clear();
}
void loop()
{
delay(100);
int rpm=getRPM();
lcd.clear();
displayRPM(rpm);
// displayBar(rpm);
}
int getRPM()
{
// sample for sampleTime in millisecs
int kount=0;
boolean kflag=LOW;
unsigned long currentTime=0;
unsigned long startTime=millis();
while (currentTime<=sampleTime)
{
if (digitalRead(hallPin)==HIGH)
{
kflag=HIGH;
}
if (digitalRead(hallPin)==LOW && kflag==HIGH)
{
kount++;
kflag=LOW;
}
currentTime=millis()-startTime;
}
int kount2rpm = int(60000./float(sampleTime))*kount;
return kount2rpm;
}
void displayRPM(int rpm)
{
lcd.clear();
// set the cursor to column 0, line 1
lcd.setCursor(0, 0);
// print the number of seconds since reset:
lcd.print(rpm,DEC);
if((rpm)==60) //change value to own choice
{
digitalWrite(shiftLed,HIGH);
}
else if((rpm)==120) //change value to own choice
{
digitalWrite(shiftLed,HIGH);
}
else if((rpm)==180) //Change value to own choice
{
digitalWrite(shiftLed,HIGH);
}
else
{
digitalWrite(shiftLed,LOW);
}
lcd.setCursor(7,0);
lcd.print("NEO RPM");
}
//void displayBar(int rpm)
//{
// int numOfBars=map(rpm,0,maxRPM,0,15);
// lcd.setCursor(0,1);
// if (rpm!=0)
//{
//
//{
// lcd.setCursor(i,1);
// lcd.write(1023);
//}}}
