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| 1 | #!/usr/bin/node | |
| 2 | ||
| 3 | - | //////////////////////////////////////// |
| 3 | + | |
| 4 | - | // blinkLED.js |
| 4 | + | |
| 5 | - | // Blinks the USR LEDs and P9_14. |
| 5 | + | const LED0 = "/sys/class/leds/beaglebone:green:usr0"; |
| 6 | - | // Wiring: P9_14 connects to the plus lead of an LED. The negative lead of the |
| 6 | + | |
| 7 | - | // LED goes to a 220 Ohm resistor. The other lead of the resistor goes |
| 7 | + | // initialize LED0 |
| 8 | - | // to ground. |
| 8 | + | fs.writeFileSync(LED1+'/trigger', 'none'); |
| 9 | - | // Setup: |
| 9 | + | fs.writeFileSync(LED1+'/brightness', '0'); |
| 10 | - | // See: |
| 10 | + | |
| 11 | - | //////////////////////////////////////// |
| 11 | + | let led1_is_on = false; // initial state |
| 12 | ||
| 13 | function toggle_led0() {
| |
| 14 | - | let LED1 = "/sys/class/leds/beaglebone:green:usr0/brightness"; |
| 14 | + | if( led1_is_on ) {
|
| 15 | - | //const LED2 = "/sys/class/leds/beaglebone:green:usr1"; |
| 15 | + | led1_is_on = false; |
| 16 | - | //const LED3 = "/sys/class/leds/beaglebone:green:usr2"; |
| 16 | + | fs.writeFileSync(LED0+'/brightness', '0'); |
| 17 | - | //const LED4 = "/sys/class/leds/beaglebone:green:usr3"; |
| 17 | + | } else {
|
| 18 | - | //const LED5 = "/sys/class/leds/beaglebone:green:usr4"; |
| 18 | + | led1_is_on = true; |
| 19 | fs.writeFileSync(LED0+'/brightness', '255'); | |
| 20 | - | // var brightness = [ "/sys/class/leds/beaglebone:green:usr0/brightness", "/sys/class/leds/beaglebone:green:usr1/brightness", |
| 20 | + | } |
| 21 | - | // "/sys/class/leds/beaglebone:green:usr2/brightness", "/sys/class/leds/beaglebone:green:usr3/brightness", |
| 21 | + | } |
| 22 | - | // "/sys/class/leds/beaglebone:green:usr4/brightness" ]; |
| 22 | + | |
| 23 | setInterval(toggle_led0, 1000); // call toggle_led0() every second |
