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| 1 | #!/usr/bin/node | |
| 2 | ||
| 3 | const fs = require('fs');
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| 4 | ||
| 5 | const LED0 = "/sys/class/leds/beaglebone:green:usr0"; | |
| 6 | ||
| 7 | // initialize LED0 | |
| 8 | fs.writeFileSync(LED0+'/trigger', 'none'); | |
| 9 | fs.writeFileSync(LED0+'/brightness', '0'); | |
| 10 | ||
| 11 | let led0_is_on = false; // initial state | |
| 12 | ||
| 13 | function toggle_led0() {
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| 14 | if( led0_is_on ) {
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| 15 | led0_is_on = false; | |
| 16 | fs.writeFileSync(LED0+'/brightness', '0'); | |
| 17 | } else {
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| 18 | led0_is_on = true; | |
| 19 | fs.writeFileSync(LED0+'/brightness', '255'); | |
| 20 | } | |
| 21 | } | |
| 22 | ||
| 23 | setInterval(toggle_led0, 1000); // call toggle_led0() every second |
