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

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[
{
"id": "8b346a30.651a88",
"type": "rpi-sensehatsim 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"
]
]
}
]