Embedded Systems Design with the Atmel AVR Microcontroller Part II

putcommand(0x80);
6.11. PULSE WIDTH MODULATION: AUTOMATED FAN COOLING SYSTEM 177
putChar((unsigned char)(ones)+48);
putChar(’.’);
putChar((unsigned char)(tenths)+48);
putChar((unsigned char)(hundredths)+48);
putChar(’V’);
putcommand(0xC0);
}
//*************************************************************************
void temperatureToLCD(unsigned int ADCValue)
{
float voltage,temperature;
unsigned int tens, ones, tenths;
voltage = (float)ADCValue*5.0/1024.0;
temperature = voltage*100;
tens = (unsigned int)(temperature/10);
ones = (unsigned int)(temperature-(float)tens*10);
tenths = (unsigned int)(((temperature-(float)tens*10)-(float)ones)*10);
putcommand(0x80);
putChar((unsigned char)(tens)+48);
putChar((unsigned char)(ones)+48);
putChar(’.’);
putChar((unsigned char)(tenths)+48);
putChar(’F’);
}
//*************************************************************************
void PWM(unsigned int PWM_incr)
{
unsigned int fan_Speed_int;
float fan_Speed_float;
int PWM_duty_cycle;