node-red-nodes/hardware/sensehat/examples/Clock.json

[{"id":"8b346a30.651a88","type":"rpi-sensehat out","z":"7756eff1.08d0a","name":"","x":530,"y":220,"wires":[]},{"id":"c2e7a15d.237bd","type":"function","z":"7756eff1.08d0a","name":"Simple graphical clock","func":"\n// array to hold \"random\" pixels\nvar ranNums = [];\n\n// create a non-overlapping array of random numbers 0-8\nfunction rerand() {\n    var nums = [0,1,2,3,4,5,6,7,8];\n    var i = nums.length;\n    var j;\n    ranNums = [];\n    while (i--) {\n        j = Math.floor(Math.random() * (i+1));\n        ranNums.push(nums[j]);\n        nums.splice(j,1);\n    }\n}\n\n// Get the hours and minutes and split into tens and units\nvar d = new Date();\nvar s = d.getSeconds();\nvar su = s%4;\nif (su === 0) {\n    var h = d.getHours();\n    var m = d.getMinutes();\n    var hu = h%10;\n    h = parseInt(h/10);\n    var mu = m%10;\n    m = parseInt(m/10);\n    \n    // Do the tens of hours (red)\n    rerand();\n    node.send({payload:\"1-3,1-3,0,0,0\"});\n    for (var i=0; i<h; i++) {\n        node.send({payload:(1+ranNums[i]%3)+\",\"+(1+parseInt(ranNums[i]/3))+\",255,0,0\"});\n    }\n    \n    // Do the units of hours (green)\n    rerand();\n    node.send({payload:\"4-6,1-3,0,0,0\"});\n    for (var i=0; i<hu; i++) {\n        node.send({payload:(4+ranNums[i]%3)+\",\"+(1+parseInt(ranNums[i]/3))+\",0,255,0\"});\n    }\n    \n    // Do the tens of minutes (yellow)\n    rerand();\n    node.send({payload:\"1-3,4-6,0,0,0\"});\n    for (var i=0; i<m; i++) {\n        node.send({payload:(1+ranNums[i]%3)+\",\"+(4+parseInt(ranNums[i]/3))+\",255,255,0\"});\n    }\n    \n    // Do the unit of minutes (blue)\n    rerand();\n    node.send({payload:\"4-6,4-6,0,0,0\"});\n    for (var i=0; i<mu; i++) {\n        node.send({payload:(4+ranNums[i]%3)+\",\"+(4+parseInt(ranNums[i]/3))+\",0,0,255\"});\n    }\n    \n}\nnode.send({payload:\"0,0,\"+(su===0?\"purple\":\"off\")+\",7,0,\"+(su===1?\"purple\":\"off\")+\",7,7,\"+(su===2?\"purple\":\"off\")+\",0,7,\"+(su===3?\"purple\":\"off\")})\n\n\n// nothing left to do\nreturn null;","outputs":1,"noerr":0,"x":320,"y":220,"wires":[["8b346a30.651a88"]]},{"id":"fc3808df.6cbcf8","type":"comment","z":"7756eff1.08d0a","name":"Simple graphical clock for Sense Hat","info":"Generates a graphical clock, showing hours and minutes. \n\nHours are shown by the red and green pixels, minutes\nare the yellow and blue pixels.\n\nUses the local time of the Pi - you may need to set your local\ntimezone using\n\n    sudo dpkg-reconfigure tzdata\n","x":210,"y":180,"wires":[]},{"id":"f33ea1a7.27216","type":"inject","z":"7756eff1.08d0a","name":"","topic":"","payload":"","payloadType":"date","repeat":"1","crontab":"","once":true,"x":120,"y":220,"wires":[["c2e7a15d.237bd"]]}]