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      1 /*
      2 * Author: Mihai Tudor Panu <mihai.tudor.panu (at) intel.com>
      3 * Copyright (c) 2015 Intel Corporation.
      4 *
      5 * Permission is hereby granted, free of charge, to any person obtaining
      6 * a copy of this software and associated documentation files (the
      7 * "Software"), to deal in the Software without restriction, including
      8 * without limitation the rights to use, copy, modify, merge, publish,
      9 * distribute, sublicense, and/or sell copies of the Software, and to
     10 * permit persons to whom the Software is furnished to do so, subject to
     11 * the following conditions:
     12 *
     13 * The above copyright notice and this permission notice shall be
     14 * included in all copies or substantial portions of the Software.
     15 *
     16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     23 */
     24 
     25 // Some vars
     26 var colon = true;
     27 var interval;
     28 
     29 // Load display
     30 var tm1637 = require('jsupm_tm1637');
     31 
     32 // Instantiate on pins 0 (Clk) and 1 (Dio)
     33 var display = new tm1637.TM1637(0, 1);
     34 
     35 // Get the current time
     36 var now = new Date();
     37 console.log("System time: " + now.getHours() + ":" + ("0" + now.getMinutes()).slice(-2));
     38 console.log("Time zone can be changed by setting the TZ environment variable.");
     39 
     40 // Display and time update function
     41 function update(){
     42     now = new Date();
     43     var time = now.getHours().toString() + ("0" + now.getMinutes().toString()).slice(-2);
     44     display.writeString(time);
     45     display.setColon(colon = !colon);
     46 }
     47 
     48 // Start with a 7-segment encoded box on the display
     49 display.write(0x39, 0x09, 0x09, 0x0f);
     50 
     51 // Start displaying the clock after 3 seconds
     52 setTimeout(function(){
     53     // And update every second thereafter
     54     interval = setInterval(update, 1000);
     55 }, 3000)
     56 
     57 // Exit handler
     58 process.on('SIGINT', function()
     59 {
     60     clearInterval(interval);
     61     display = null;
     62     tm1637.cleanUp();
     63     tm1637 = null;
     64     console.log("Interrupt received, exiting...");
     65     process.exit(0);
     66 });
     67