{"id":4200,"date":"2012-08-01T08:30:50","date_gmt":"2012-08-01T07:30:50","guid":{"rendered":"http:\/\/www.markwilson.co.uk\/blog\/?p=4200"},"modified":"2017-01-31T20:44:25","modified_gmt":"2017-01-31T20:44:25","slug":"upgraded-the-traffic-lights-in-my-office-already","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2012\/08\/upgraded-the-traffic-lights-in-my-office-already.htm","title":{"rendered":"Upgraded the “traffic lights” in my office already"},"content":{"rendered":"

Last night I wrote a blog post about the “traffic lights” for my office<\/a>. The trouble with the original setup was that the light was set to a particular state until I edited the code and uploaded a new version to the Arduino.<\/p>\n

I was so excited about having something working that I hadn’t actually finished reading the Arduino Programming For Beginners: The Traffic Light Controller<\/a> post that I referenced. Scroll down a bit further and James Bruce<\/a> extends his traffic light sequence to simulate someone pressing a button to change the lights (e.g. to cross the road).<\/p>\n

I worked on this to come up with something similar – using a variation on James’ wiring diagram (except with 2 LEDs rather than 3, and using pins 11 and 12 for my LEDs and 2 for the pushbutton switch), I now have a setup which waits for the button to be pressed, then sets the red LED, until the button is pressed again (when it goes green), etc.<\/p>\n

My code is available on github<\/a> but here’s the current version (just in case I lose that version as I get to grips with source control…):<\/p>\n

\/*\nRed\/green LED indicator with pushbutton control\nBased on http:\/\/www.makeuseof.com\/tag\/arduino-traffic-light-controller\/\n*\/\n\n\/\/ Pins for coloured LEDs\nint red = 11;\nint green = 12;\nint light = 0;\n\nint button = 2; \/\/ Pushbutton on pin 2\nint buttonValue = 0; \/\/ Button defaults to 0 (LOW)\n\nvoid setup(){\n\/\/ Set up pins with LEDs as output devices and switch for input\npinMode(red,OUTPUT);\npinMode(green,OUTPUT);\npinMode(button,INPUT);\n}\n\nvoid loop(){\n\/\/ Read the value of the pushbutton switch\nbuttonValue = digitalRead(button);\nif (buttonValue == HIGH){\nchangeLights();\ndelay(15000); \/\/ Wait 15 seconds before reading again\n}\n}\n\nvoid changeLights(){\n\/\/ Change the lights based on current value: 0 is not set; 1 is green; 2 is red\nswitch (light) {\ncase 1:\nturnLightRed();\nbreak;\ncase 2:\nturnLightGreen();\nbreak;\ndefault:\nturnLightRed();\n}\n}\n\nvoid turnLightGreen(){\n\/\/ Turn off the red and turn on the green\ndigitalWrite(red,LOW);\ndigitalWrite(green,HIGH);\nlight = 1;\n}\n\nvoid turnLightRed(){\n\/\/ Turn off the green and turn on the red\ndigitalWrite(green,LOW);\ndigitalWrite(red,HIGH);\nlight = 2;\n}<\/pre>\n
Now I’m wondering how long it will be before the kids work out that they too can change the status (like pushing the button at a pedestrian crossing!)…<\/p>\n","protected":false},"excerpt":{"rendered":"
Last night I wrote a blog post about the “traffic lights” for my office. The trouble with the original setup was that the light was set to a particular state until I edited the code and uploaded a new version to the Arduino. I was so excited about having something working that I hadn’t actually … Continue reading Upgraded the “traffic lights” in my office already<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[218],"tags":[369,425],"class_list":["post-4200","post","type-post","status-publish","format-standard","hentry","category-technology","tag-arduino","tag-electronics"],"yoast_head":"\nUpgraded the "traffic lights" in my office already - markwilson.it<\/title>\n<meta name=\"description\" content=\"Creating a "traffic light" status indicator to show busy\/available status with an Arduino and some LEDs\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.markwilson.co.uk\/blog\/2012\/08\/upgraded-the-traffic-lights-in-my-office-already.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Upgraded the "traffic lights" in my office already - 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Walking to the door to push a button\u2026","rel":"","context":"In "Technology"","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/basic-red-yellow-green-led-button-ethernet.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":4189,"url":"https:\/\/www.markwilson.co.uk\/blog\/2012\/07\/traffic-lights-for-my-home-office.htm","url_meta":{"origin":4200,"position":1},"title":"“Traffic lights” for my home office","author":"Mark Wilson","date":"Tuesday 31 July 2012","format":false,"excerpt":"It's the school holidays, which means that working from home can be a little... noisy... at times. \u00a0Earlier today I saw a blog post from Scott Hanselman where he had hooked a light up to his instant messenger status to tell his family when he was on a call, or\u2026","rel":"","context":"In "Technology"","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3752,"url":"https:\/\/www.markwilson.co.uk\/blog\/2012\/03\/getting-started-with-arduino.htm","url_meta":{"origin":4200,"position":2},"title":"Getting started with Arduino","author":"Mark Wilson","date":"Wednesday 21 March 2012","format":false,"excerpt":"A couple of days ago, my new Arduino\u00a0board arrived and, last night, I finally got around to having a play. For those who don't know what an Arduino is: \"Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and\u2026","rel":"","context":"In "Technology"","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"Arduino Uno","src":"https:\/\/i0.wp.com\/farm7.staticflickr.com\/6209\/6052455554_a4301347ef_m.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":4215,"url":"https:\/\/www.markwilson.co.uk\/blog\/2012\/08\/storing-arduino-code-in-the-cloud.htm","url_meta":{"origin":4200,"position":3},"title":"Storing Arduino code in the cloud","author":"Mark Wilson","date":"Friday 3 August 2012","format":false,"excerpt":"Earlier this week I blogged about some of the stuff I'd been doing with Arduino and I mentioned that my code is up on GitHub. What I didn't mention is how it got there... 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