Hi,
I'm new to the beaglebone black, and have been getting started with writing
my first programs, such as blinking LED's, and simple control of the IO
pins. I'm having trouble with a program I'm working on, in which you vary
the voltage coming out of the PWM pins to change the color of an RGB LED.
The project comes from this link
https://learn.adafruit.com/fading-a-rgb-led-on-beaglebone-black/writing-a-program,
and I'm having trouble converting the python code into JavaScript. My
attempt at the JavaScript code is below:
var b = require('bonescript');
var red = 'P8_19';
var blue = 'P9_14';
var green = 'P8_13';
var position = 0;
var interval = .05;
b.pinMode(green, b.OUTPUT);
fader();
b.pinMode(blue, b.OUTPUT);
fader();
b.pinMode(red, b.OUTPUT);
fader();
function fader() {
b.analogWrite(green, 1.0, 1000);
b.analogWrite(blue, 1-position, 1000);
b.analogWrite(red, position, 1000, scheduleNextColor);
}
function scheduleNextColor() {
position = position + interval;
if(position < 0) {
position = 0;
interval = -interval;
} else if(position > 1) {
position = 1;
interval = -interval;
}
setTimeout(fader, 500);
}
I am getting errors when I try to run the program:
error: error updating PWM freq and value: /sys/devices/ocp.3/
bs_pwm_test_P8_19.60, Error: ENOENT, no such file or directory
'/sys/devices/ocp.3/bs_pwm_test_P8_19.60/duty'
error: error updating PWM freq and value: /sys/devices/ocp.3/
bs_pwm_test_P9_14.59, Error: ENOENT, no such file or directory
'/sys/devices/ocp.3/bs_pwm_test_P9_14.59/duty'
error: error updating PWM freq and value: /sys/devices/ocp.3/
bs_pwm_test_P8_19.60, Error: ENOENT, no such file or directory
'/sys/devices/ocp.3/bs_pwm_test_P8_19.60/duty'
error: error updating PWM freq and value: /sys/devices/ocp.3/
bs_pwm_test_P9_14.59, Error: ENOENT, no such file or directory
'/sys/devices/ocp.3/bs_pwm_test_P9_14.59/duty'
These errors will repeat, and sometimes the LED comes on, and sometimes it
doesn't. I am using the wiring diagram that is on the adafruit website, and
I have a common anode LED. If you need more info, I can provide it. Any
help is appreciated, thank you.
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
