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Author: AashiDutt

PWM project/Dc_motor_&_LED_dimming_using_PWM.c

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+// this is a c code for project on Dc motor and LED blinking using Pulse Width Modulation
+
+#include<reg52.h>
+
+void ms_delay(unsigned int time);
+
+void main()
+{
+	int x;
+	
+	while(1)
+	{
+	for(x=0;x<=200;x++)
+	{
+		P1=0x0ff;     // on led
+		P3=(0x01<<5); // on motor(left shift by 5 places
+		ms_delay(1);  // 1s delay
+		P1 =0x00;     // off led
+		P3 = 0x00;    // off motor
+		ms_delay(9);
+		
+	}
+	
+	for(x=0;x<=200;x++)
+	{
+		P1=0x0ff;    // on led
+		P3=(0x01<<5);  // motor on
+		ms_delay(1);  // 1s delay
+		P1 =0x00;     // off led
+		P3 = 0x00;    // off motor
+		ms_delay(5);
+	}
+	
+	for(x=0;x<=200;x++)
+	{
+		P1=0x0ff;    // on led
+		P3=(0x01<<5);  // motor on
+		ms_delay(9);  // 1s delay
+		P1 =0x00;     // off led
+		P3 = 0x00;    // off motor
+		ms_delay(1);
+	}
+}
+}
+
+void ms_delay(unsigned int time)
+{
+	unsigned int i,j;
+	// time X 1ms
+	for(i=0;i<time;i++)
+	{
+		for(j=0;j<113;j++);
+		
+	}
+	
+}
+