I am working on using the Electric Imp I got from Adafruit to make a WiFi enabled\u00a0Emoticon\u00a0avatar.\u00a0Basically\u00a0it will\u00a0receive\u00a0code from a website and display the icon for that code on a small 8×8 LED matrix\u00a0accompanied\u00a0by a notification\u00a0sound. This will also provide feedback through a button on the\u00a0avatar\u00a0to\u00a0acknowledge\u00a0the emoticon, and a motion detector to tell when\u00a0someone\u00a0is near the\u00a0avatar.<\/p>\n
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So far I have gotten the Imp to\u00a0receive\u00a0data from a webpage and turn LEDs on or off from three\u00a0independent\u00a0I\/O pins. The LEDs are red, green, and blue so they make\u00a0different\u00a0colors depending on which ones are on.
\nHere is the code I am using to do this.<\/p>\n
Squirrel code:<\/p>\n
\/\/ Register with the server\r\n\/\/ April with brightness-controlled LED\r\n\r\nhardware.pin1.configure(PWM_OUT, 1.0\/500.0, 1.0);\r\nhardware.pin2.configure(PWM_OUT, 1.0\/500.0, 1.0);\r\nhardware.pin5.configure(PWM_OUT, 1.0\/500.0, 1.0);\r\n\r\nclass TableIn extends InputPort\r\n{\r\n\/\/name = \"LED Brightness\"\r\n\/\/type = \"number\"\r\n\r\nfunction set(v) {\r\n\/\/ since pin 9 is configured for PWM, we can set the duty cycle with pin.write()\r\n\/\/ write a floating point number between 0.0 and 1.0, where 1.0 = 100% duty cycle\r\nhardware.pin1.write(v.red);\r\nhardware.pin2.write(v.green);\r\nhardware.pin5.write(v.blue);\r\nserver.log(\"v.red: \"+v.red+\" v.green: \"+v.green+\" v.blue: \"+v.blue);\r\n}\r\n}\r\n\r\n\/\/ Variable to represent LED state\r\nledState <- 0;\r\n\r\n\/\/ blink function called every 100ms\r\nfunction blink()\r\n{\r\n\/\/ Change state\r\nledState = ledState?0:1;\r\n\r\n\/\/ Reflect state to the pin\r\nhardware.pin8.write(ledState);\r\n\r\n\/\/ Schedule the next state change\r\nimp.wakeup(0.1, blink);\r\n}\r\n\r\n\/\/ Configure pin 9 as an open drain output with internal pull up\r\nhardware.pin8.configure(DIGITAL_OUT_OD_PULLUP);\r\n\r\nserver.log(\"Brightness Controller Started\");\r\nimp.configure(\"April Brightness Controller\", [ TableIn() ], []);\r\n\/\/blink();\r\nserver.sleepfor(30);<\/pre>\nHTML Form:<\/p>\n
Note: You will need to replace the\u00a0“https:\/\/api.electricimp.com\/v1\/…use.your.own.address…” with the URL from the HTTP IN node in the Imp Planner.<\/span><\/p>\n<html><head><script>\r\nfunction sendForm(form)\r\n{\r\n\/\/ Construct the JSON string in form.value\r\n\/\/ x is a string ('cos of the quotes)\r\n\/\/ y is an integer ('cos of no quotes)\r\nform.value.value = \"{ \"red\": \" + form.red.value + \", \"green\": \" + form.green.value + \", \"blue\": \" + form.blue.value + \" }\"\r\nform.submit();\r\n}\r\n<\/script><\/head>\r\n<body>\r\n\r\n<table width=\"200\" border=\"1\">\r\n<tr>\r\n<td>Off<\/td>\r\n<td><form action=\"https:\/\/api.electricimp.com\/v1\/...use.your.own.address...\" method=\"post\" target=\"stat\">\r\n<input type=\"hidden\" name=\"value\">\r\n<input type=\"hidden\" name=\"red\" value=1>\r\n<input type=\"hidden\" name=\"green\" value=1>\r\n<input type=\"hidden\" name=\"blue\" value=1>\r\n<input type=\"button\" value=\"ON\" onclick=\"sendForm(this.form);\" \/>\r\n<\/form><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Red<\/td>\r\n<td><form action=\"https:\/\/api.electricimp.com\/v1\/...use.your.own.address...\" method=\"post\" target=\"stat\">\r\n<input type=\"hidden\" name=\"value\">\r\n<input type=\"hidden\" name=\"red\" value=0>\r\n<input type=\"hidden\" name=\"green\" value=1>\r\n<input type=\"hidden\" name=\"blue\" value=1>\r\n<input type=\"button\" value=\"ON\" onclick=\"sendForm(this.form);\" \/>\r\n<\/form><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Orange<\/td>\r\n<td><form action=\"https:\/\/api.electricimp.com\/v1\/...use.your.own.address...\" method=\"post\" target=\"stat\">\r\n<input type=\"hidden\" name=\"value\">\r\n<input type=\"hidden\" name=\"red\" value=0>\r\n<input type=\"hidden\" name=\"green\" value=0>\r\n<input type=\"hidden\" name=\"blue\" value=1>\r\n<input type=\"button\" value=\"ON\" onclick=\"sendForm(this.form);\" \/>\r\n<\/form><\/td>\r\n<\/tr>\r\n<\/tr>\r\n<tr>\r\n<td>green<\/td>\r\n<td><form action=\"https:\/\/api.electricimp.com\/v1\/...use.your.own.address...\" method=\"post\" target=\"stat\">\r\n<input type=\"hidden\" name=\"value\">\r\n<input type=\"hidden\" name=\"red\" value=1>\r\n<input type=\"hidden\" name=\"green\" value=0>\r\n<input type=\"hidden\" name=\"blue\" value=1>\r\n<input type=\"button\" value=\"ON\" onclick=\"sendForm(this.form);\" \/>\r\n<\/form><\/td>\r\n<\/tr>\r\n<\/tr>\r\n<tr>\r\n<td>light blue<\/td>\r\n<td><form action=\"https:\/\/api.electricimp.com\/v1\/...use.your.own.address...\" method=\"post\" target=\"stat\">\r\n<input type=\"hidden\" name=\"value\">\r\n<input type=\"hidden\" name=\"red\" value=1>\r\n<input type=\"hidden\" name=\"green\" value=0>\r\n<input type=\"hidden\" name=\"blue\" value=0>\r\n<input type=\"button\" value=\"ON\" onclick=\"sendForm(this.form);\" \/>\r\n<\/form><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>blue<\/td>\r\n<td><form action=\"https:\/\/api.electricimp.com\/v1\/...use.your.own.address...\" method=\"post\" target=\"stat\">\r\n<input type=\"hidden\" name=\"value\">\r\n<input type=\"hidden\" name=\"red\" value=1>\r\n<input type=\"hidden\" name=\"green\" value=1>\r\n<input type=\"hidden\" name=\"blue\" value=0>\r\n<input type=\"button\" value=\"ON\" onclick=\"sendForm(this.form);\" \/>\r\n<\/form><\/td>\r\n<\/tr>\r\n<\/tr>\r\n<tr>\r\n<td>perple<\/td>\r\n<td><form action=\"https:\/\/api.electricimp.com\/v1\/...use.your.own.address...\" method=\"post\" target=\"stat\">\r\n<input type=\"hidden\" name=\"value\">\r\n<input type=\"hidden\" name=\"red\" value=0>\r\n<input type=\"hidden\" name=\"green\" value=1>\r\n<input type=\"hidden\" name=\"blue\" value=0>\r\n<input type=\"button\" value=\"ON\" onclick=\"sendForm(this.form);\" \/>\r\n<\/form><\/td>\r\n<\/tr>\r\n<\/table>\r\n<iframe src=\"\" name=\"stat\">\r\n<\/body>\r\n<\/html><\/pre>\nThis code is based on the example found here<\/a>.<\/p>\nShare this:<\/h3>