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November 13, 2016 02:27
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ev3dev LED color demo
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| #!/usr/bin/env python | |
| import time | |
| LED_PATH = "/sys/class/leds/ev3:%(color)s:%(direction)s/brightness" | |
| def do_up_down(f1, f2, f3, f4): | |
| for i in range(0, 256): | |
| val1 = str(i) | |
| val2 = str(255-i) | |
| if f1: | |
| f1.write(val1) | |
| if f2: | |
| f2.write(val2) | |
| if f3: | |
| f3.write(val2) | |
| if f4: | |
| f4.write(val1) | |
| time.sleep(0.03) | |
| def main(): | |
| f1 = open(LED_PATH % { "color": "green", "direction": "left" }, "w", 0) | |
| f2 = open(LED_PATH % { "color": "red", "direction": "left" }, "w", 0) | |
| f3 = open(LED_PATH % { "color": "green", "direction": "right" }, "w", 0) | |
| f4 = open(LED_PATH % { "color": "red", "direction": "right" }, "w", 0) | |
| # assumes starting with green LEDs illuminated | |
| # dims green LEDs only to off | |
| do_up_down(None, f1, f3, None) | |
| time.sleep(0.5) | |
| # brings red LEDs only to full | |
| do_up_down(f2, None, None, f4) | |
| time.sleep(0.1) | |
| # fades left LED from red to green and right LED from green to red | |
| do_up_down(f1, f2, f3, f4) | |
| # fades left LED from green to red and right LED from red to green | |
| do_up_down(f2, f1, f4, f3) | |
| # return to full green only state | |
| f1.write("255") | |
| f2.write("0") | |
| f3.write("255") | |
| f4.write("0") | |
| if __name__ == "__main__": | |
| main() |
I also got an error message
Traceback (most recent call last): File "led-color-demo.py", line 44, in <module> main() File "led-color-demo.py", line 22, in main f1 = open(LED_PATH % { "color": "green", "direction": "left" }, "w", 0) IOError: [Errno 2] No such file or directory: '/sys/class/leds/ev3:green:left/brightness'
I'm running the latest ev3dev 3.16.7
on a Lego Mindstorms EV3 brick
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I copied and pasted this in a file, ran it but... didn't work.
robot@ev3dev:~/tests$ python essaiLeds.py Traceback (most recent call last): File "essaiLeds.py", line 44, in <module> main() File "essaiLeds.py", line 22, in main f1 = open(LED_PATH % { "color": "green", "direction": "left" }, "w", 0) IOError: [Errno 2] No such file or directory: '/sys/class/leds/ev3:green:left/brightness' robot@ev3dev:~/tests$I have Brickman 0.8.0
kernel 4.4.24-16-ev3dev-ev3
Is it me, my config or... your script ?
Thanks for any clue.