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i am trying to run the code from lesson 8 (picar pro) but i keep getting errors.
see code and errors below.
code:
import time
from rpi_ws281x import*
class LED:
def __init__(self):
self.LED_COUNT = 3 # set to the total number of LED lights on the robot, which can be more than the total number of LED lights connected to the Raspberry Pi
self.LED_PIN = 12 # pin LED
self.LED_FREQ_HZ = 800000
self.LED_DMA = 10
self.LED_BRIGHTNESS = 255
self.LED_INVERT = False
self.LED_CHANNEL = 0
#use the conf items above to create a strip
self.strip = Adafruit_NeoPixel(
self.LED_COUNT,
self.LED_PIN,
self.LED_FREQ_HZ,
self.LED_DMA,
self.LED_INVERT,
self.LED_BRIGHTNESS,
self.LED_CHANNEL
)
self.strip.begin()
def colorWipe(self, R, G, B): #this function is used to change the LED
color = Color(R, G, B)
for i in range(self.strip.numPixels()): # Only one LED light color can be set at a time, so a cycle is required
self.strip.setPixelColor(i, color)
self.strip.show()# After calling the show method, the color will really change
if __name__ == '__main__':
led=LED()
try:
while 1:
led.colorWipe(225, 0, 0) #LEDS turn red
time.sleep(1)
led.colorWipe(0, 225, 0) #LEDS turn green
time.sleep(1)
led.colorWipe(0, 0, 225) #LEDS turn blue
time.sleep(1)
except:
LED.colorWipe(0, 0, 0) #Turn off all lights
errors:
Can't open /dev/mem: Permission denied
Traceback (most recent call last):
File "/home/pi/python/picar_pro_codes_self/leds2.py", line 33, in <module>
led=LED()
File "/home/pi/python/picar_pro_codes_self/leds2.py", line 24, in __init__
self.strip.begin()
File "/usr/local/lib/python3.7/dist-packages/rpi_ws281x/rpi_ws281x.py", line 131, in begin
raise RuntimeError('ws2811_init failed with code {0} ({1})'.format(resp, str_resp))
RuntimeError: ws2811_init failed with code -5 (mmap() failed)
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Post time 2021-8-19 22:58:39