{"id":978,"date":"2015-07-27T16:44:22","date_gmt":"2015-07-27T06:44:22","guid":{"rendered":"http:\/\/bandetech.com\/blog\/?page_id=978"},"modified":"2015-07-27T16:52:33","modified_gmt":"2015-07-27T06:52:33","slug":"infrared-remote-technical-guide","status":"publish","type":"page","link":"https:\/\/bandetech.com\/blog\/infrared-remote-technical-guide\/","title":{"rendered":"Infrared remote \u2014 Technical guide"},"content":{"rendered":"

This is the outline of the Arduino code and schematics for the Remote Enhancements<\/a> project.<\/p>\n

This was a two-part project: Firstly,\u00a0determine the codes coming\u00a0from the TV’s remote control; Secondly,\u00a0to listen for and respond to specific\u00a0codes.<\/p>\n

The set up and Arduino code for the first part is remarkably\u00a0simple. Connect\u00a0the IR receiver module to power, ground and a digital input pin on the Arduino. Upload the code\u00a0to the Arduino (make sure the correct pin is specified\u00a0in the code)\u00a0and then open the serial monitor.\u00a0When a button\u00a0on a remote control is pressed, the associated code is displayed in the Arduino’s Serial Monitor window.<\/p>\n

\"Circuit <\/a> <\/div> <\/div>
\"Output\" <\/a> <\/div> <\/div> <\/div> <\/div>\n
\r\n\/*\r\nIR Remote code reader\r\n\r\nThe circuit: IR module to d10\r\n\r\n*\/\r\n\r\n#include <IRremote.h>\r\n#define IRPIN 10\r\n\r\nIRrecv irrecv(IRPIN); \/\/ create instance of 'irrecv' on IRPIN\r\ndecode_results results; \/\/ variable to hold incoming codes\r\n\r\nvoid setup() {\r\n  irrecv.enableIRIn(); \/\/ Start the receiver\r\n  Serial.begin(9600);\r\n}\r\n\r\nvoid loop() {\r\n  \/\/ 2Hz flash of onboard LED\r\n  digitalWrite(13, HIGH);\r\n  delay(20);\r\n  digitalWrite(13, LOW);\r\n  delay(480);\r\n\r\n  if (irrecv.decode(&amp;results)) {\r\n    irCheck();\r\n    irrecv.resume();\r\n  }\r\n} \/\/ end main loop\r\n\r\nvoid irCheck() {\r\n  Serial.println(results.value);\r\n}\r\n<\/pre>\n
For the final project goal, digital pin d05 was\u00a0connected to the PC’s power-on wire (green from the ATX power supply). When this line is connected to ground (via a digital LOW signal), the computer starts. The servo motor was mechanically attached to the HDMI switch and a servo horn was attached\u00a0to act as a short lever. When the servo moves a few degrees, the button on top of the HDMI switch is pressed down. The amount of servo movement needed was determined by trial and error.<\/p>\n
\"IR<\/a><\/p>\n
\r\n\r\n\/*\r\n\r\nIR Remote on for HTPC\r\nv1.0 150719 - Set up IR receiver\r\nv1.1 150722 - Add servo for HDMI switcher\r\n\r\n  The circuit:\r\n * IR LED data to d10\r\n * Output d05, active low, to ground power-on rail\r\n * Servo on d09\r\n\r\n Remote Signals from Samsung TV control\r\n 470021382 = STB\r\n 2088030026 = CABLE\r\n 4200456840 = VCR\r\n 1625891106 = TV\r\n\r\n*\/\r\n\r\n#include <IRremote.h>\r\n#include <Servo.h> \r\n\r\n#define IRPIN 10\r\n#define onPIN 5\r\n#define svoPIN 9\r\n#define svoUP 147\r\n#define svoDN 127\r\n\r\nServo myservo;            \/\/ create servo object to control a servo\r\nIRrecv irrecv(IRPIN);     \/\/ create instance of 'irrecv' on IRPIN\r\ndecode_results results;   \/\/ variable to hold incoming codes\r\n\r\n\/\/ Global variables\r\n\r\nvoid setup() {\r\n  pinMode(onPIN, OUTPUT);   \/\/ set the power-on pin for output and active LOW\r\n  digitalWrite(onPIN, HIGH);\r\n  irrecv.enableIRIn();      \/\/ Start the receiver\r\n  myservo.attach(svoPIN);   \/\/ attaches the svoPIN to the servo object\r\n  myservo.write(svoUP);\r\n  delay(75);\r\n  myservo.detach();\r\n\r\n}\r\n\r\nvoid loop() {\r\n  \/\/ 2Hz flash of onboard LED\r\n  digitalWrite(13, HIGH);\r\n  delay(20);\r\n  digitalWrite(13, LOW);\r\n  delay(480);\r\n\r\n  if (irrecv.decode(&results)) {    \/\/ New code received? See if it needs action and then restart the IR receiver\r\n    irCheck();\r\n    irrecv.resume();\r\n    }\r\n}  \/\/ end main loop\r\n\r\nvoid irCheck() {\r\n\/\/ If the value received matches stored code for PC power on,\r\n\/\/ set onPIN LOW for 0.5s & long-flash onboard LED\r\n\/\/ or HDMI switch, then activate servo\r\n\r\n  if (results.value == 470021382) {         \/\/ code to turn PC on\r\n    digitalWrite(onPIN, LOW);               \/\/ ground power on pin\r\n    digitalWrite(13, HIGH);\r\n    delay(500);                             \/\/ wait a moment\r\n    digitalWrite(onPIN, HIGH);              \/\/ return power pin to HIGH state\r\n    digitalWrite(13, LOW);\r\n    delay(200);\r\n    }\r\n  else if (results.value == 2088030026) {   \/\/ code to activate HDMI switch\r\n    myservo.attach(svoPIN);                 \/\/ attach servo interrupt first\r\n    myservo.write(svoDN);                   \/\/ move to pressed position\r\n    digitalWrite(13, HIGH);\r\n    delay(80);                              \/\/ delay to give servo time to move\r\n    myservo.write(svoUP);                   \/\/ return servo to up position\r\n    delay(30);                              \/\/ delay to give servo time to move\r\n    digitalWrite(13, LOW);\r\n    myservo.detach();                       \/\/ detach servo object to stop jitter\r\n  }\r\n\r\n}    \/\/ end irCheck\r\n<\/pre>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
This is the outline of the Arduino code and schematics for the Remote Enhancements project. This was a two-part project: Firstly,\u00a0determine the codes coming\u00a0from the TV’s remote control; Secondly,\u00a0to listen for and respond to specific\u00a0codes. The set up and Arduino … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":995,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"jetpack_post_was_ever_published":false,"footnotes":""},"class_list":["post-978","page","type-page","status-publish","has-post-thumbnail","hentry"],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P8H2X3-fM","_links":{"self":[{"href":"https:\/\/bandetech.com\/blog\/wp-json\/wp\/v2\/pages\/978","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bandetech.com\/blog\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/bandetech.com\/blog\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/bandetech.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bandetech.com\/blog\/wp-json\/wp\/v2\/comments?post=978"}],"version-history":[{"count":10,"href":"https:\/\/bandetech.com\/blog\/wp-json\/wp\/v2\/pages\/978\/revisions"}],"predecessor-version":[{"id":996,"href":"https:\/\/bandetech.com\/blog\/wp-json\/wp\/v2\/pages\/978\/revisions\/996"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bandetech.com\/blog\/wp-json\/wp\/v2\/media\/995"}],"wp:attachment":[{"href":"https:\/\/bandetech.com\/blog\/wp-json\/wp\/v2\/media?parent=978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}