lab 4
Ran through the PWM code examples - no problems. Got my little LED to do the apple sleep thing, and then I played around a bit with changing some of the code numbers to get it to brighten and dim faster/slower/at different intervals/etc. Overall, a nice relaxing lab.
I also went ahead the servo lab, which was quite thrilling. First I used to code example just to set it go to from one end to another, which was rather exciting in and of itself. BUT THEN, I changed the code to take analogue input from a potentiometer to control the servo, and that was really exciting. Unfortunately, I didn't have my camera, so there aren't any pictures.
Here's the pic code:
DEFINE OSC 4
DEFINE ADC_BITS 10 ' Set number of bits in result DEFINE ADC_CLOCK 3 ' Set clock source (3=rc) DEFINE ADC_SAMPLEUS 50 ' Set sampling time in uS
sensorValue VAR WORD ' Create variable to store result
TRISA = %11111111 ' Set PORTA to all input ADCON1? = %10000010 ' Set PORTA analog and right justify result
output portc.3
start:
pulseWidth var byte ' set up constants with the minimum and maximum pulsewidths minPulse CON 50 maxPulse CON 250 ' set up a constant with the time between pulses: refreshPeriod CON 20 ' set an initial pulsewidth: pulseWidth = minPulse
pulseRange var word pulseRange = maxPulse - minPulse
main:
adcin 0, sensorValue
'take the output pin low so we can pulse it high
Low PORTC.3
' pulse the pin
PulsOut? PORTC.3, pulseWidth
' pause for as long as needed:
Pause refreshPeriod
pulseWidth = minPulse + (pulseRange * (sensorValue/10)) / 100