UBISS2024exam: Difference between revisions
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Created page with "=== Solution Task 1.2 Control external RGB === <syntaxhighlight lang="python" line='line'> # Blinky example import time from machine import Pin # This is the only LED pin av..." |
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<syntaxhighlight lang="python" line='line'> | <syntaxhighlight lang="python" line='line'> | ||
import | from machine import Pin, ADC | ||
from | from time import sleep | ||
# Initialize the light sensor (LDR) and LED | |||
ldr = ADC(Pin(12)) | |||
led = Pin(20, Pin.OUT) | |||
def get_duty_cycle(light_value): | |||
# Map the light value to the duty cycle | |||
# Completely dark (350) -> 90% on, 10% off | |||
# Completely bright (790) -> 10% on, 90% off | |||
min_light = 350 | |||
max_light = 790 | |||
min_duty = 90 | |||
max_duty = 10 | |||
duty_cycle = min_duty + (max_duty - min_duty) * ((light_value - min_light) / (max_light - min_light)) | |||
return duty_cycle | |||
while True: | |||
# Read the light value | |||
light_value = ldr.read_u16() # Read the analog value (16-bit) | |||
light_value = (light_value / 65535) * (790 - 350) + 350 # Scale to 350-790 range | |||
# Calculate the duty cycle | |||
duty_cycle = get_duty_cycle(light_value) | |||
# Calculate on and off times | |||
on_time = duty_cycle / 100.0 | |||
off_time = 1.0 - on_time | |||
# Control the LED | |||
led.on() | |||
sleep(on_time) | |||
led.off() | |||
sleep(off_time) | |||
</syntaxhighlight> | </syntaxhighlight> | ||
Latest revision as of 13:54, 13 June 2024
from machine import Pin, ADC
from time import sleep
# Initialize the light sensor (LDR) and LED
ldr = ADC(Pin(12))
led = Pin(20, Pin.OUT)
def get_duty_cycle(light_value):
# Map the light value to the duty cycle
# Completely dark (350) -> 90% on, 10% off
# Completely bright (790) -> 10% on, 90% off
min_light = 350
max_light = 790
min_duty = 90
max_duty = 10
duty_cycle = min_duty + (max_duty - min_duty) * ((light_value - min_light) / (max_light - min_light))
return duty_cycle
while True:
# Read the light value
light_value = ldr.read_u16() # Read the analog value (16-bit)
light_value = (light_value / 65535) * (790 - 350) + 350 # Scale to 350-790 range
# Calculate the duty cycle
duty_cycle = get_duty_cycle(light_value)
# Calculate on and off times
on_time = duty_cycle / 100.0
off_time = 1.0 - on_time
# Control the LED
led.on()
sleep(on_time)
led.off()
sleep(off_time)