How to blink led in nodered using for loop | Learn free Raspberry pi online | Raspberry pi basics

If you've used node-red, you might have faced that its quite frustrating to see how difficult it gets to do something as simple as blinking an LED. Since node-red works on dataflow, its hard to create loops like this
Now there's no for loop in node-red (as of now) and this code uses simple javascript function
This simple program will achieve blinking of LED using Switch Connected to Raspberry Pi. The code is created for nodered and am also pasting the JSON which you can import in your node-red to verify the same
code will be pasted inside * symbols. Don't copy them, just copy whats inside it
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[{"id":"407ec756.0f0118","type":"function","z":"94e7c1f9.afb24","name":"startBlink","func":"var BLINKDELAY = 1000;\n\nvar light = true;\n\nvar count = 6;\nvar brk = 0;\nvar blinker = setInterval(blink, BLINKDELAY);\n\nglobal.set(\"blinker\", blinker);\n\nfunction blink () \n{\n \n if (light) \n {\n msg.payload = 1;\n light = false;\n count--;\n }\n else {\n msg.payload = 0;\n light = true;\n }\n \n if(count === 0)\n {\n clearInterval(global.get(\"blinker\"));\n msg.payload = 0;\n brk = 1;\n }\n if(brk ===0 )\n {\n node.send(msg);\n }\n else\n {\n msg.payload = 0;\n return msg;\n }\n}\n\nreturn;","outputs":1,"noerr":0,"x":540,"y":280,"wires":[["a096acc8.f113a"]]}]

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Try this out to see how to blink led using nodered


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