{"id":676,"date":"2017-02-10T14:19:24","date_gmt":"2017-02-10T13:19:24","guid":{"rendered":"https:\/\/home.et.utwente.nl\/slootenvanf\/?p=676"},"modified":"2019-11-15T14:08:07","modified_gmt":"2019-11-15T13:08:07","slug":"build-distance-sensor-littlebits","status":"publish","type":"post","link":"https:\/\/home.et.utwente.nl\/slootenvanf\/2017\/02\/10\/build-distance-sensor-littlebits\/","title":{"rendered":"Build a distance-sensor with LittleBits"},"content":{"rendered":"<p>By utilizing the Arduino-bit and the Proto-bit, all kinds of electronic circuits and components can be connected to a Littlebits circuit.<br \/>\nIn this example, we connect an Ultrasonic sensor to the Arduino-bit with the Proto-bit.<br \/>\nThe distance measured by the Ultrasonic sensor will be displayed on the Number-bit.<br \/>\nThis example is based on the <a href=\"http:\/\/littlebits.cc\/projects\/v\" target=\"_blank\" rel=\"noopener noreferrer\">Bat Vision Invention<\/a> with some minor improvements and changes.<\/p>\n<h2>Materials<\/h2>\n<p><b>LittleBits modules<\/b><\/p>\n<ul>\n<li><a href=\"http:\/\/littlebits.cc\/bits\/littlebits-power\" target=\"_blank\" rel=\"noopener noreferrer\">Power (p1) + battery<\/a><\/li>\n<li><a href=\"https:\/\/littlebits.cc\/bits\/proto\" target=\"_blank\" rel=\"noopener noreferrer\">Proto (w9)<\/a><\/li>\n<li><a href=\"https:\/\/littlebits.cc\/bits\/w6-arduino\" target=\"_blank\" rel=\"noopener noreferrer\">Arduino (w6)<\/a><\/li>\n<li><a href=\"http:\/\/littlebits.cc\/bits\/wire-bit\" target=\"_blank\" rel=\"noopener noreferrer\">Wire (w1)<\/a><\/li>\n<li><a href=\"https:\/\/littlebits.cc\/bits\/number\" target=\"_blank\" rel=\"noopener noreferrer\">Number (o21)<\/a><\/li>\n<\/ul>\n<p><b>Other materials<\/b><\/p>\n<ul>\n<li>Ultrasonic Ranging Module HC &#8211; SR04<\/li>\n<li>4 wires with connectors male-female<\/li>\n<\/ul>\n<h2>Connect ultrasonic sensor to Proto-bit<\/h2>\n<p><a class=\"strip\" data-strip-group=\"present\" href=\"https:\/\/home.et.utwente.nl\/slootenvanf\/wp-content\/uploads\/2017\/02\/connect_ultrasonic_senor_proto_bit.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-677 size-medium alignnone\" src=\"https:\/\/home.et.utwente.nl\/slootenvanf\/wp-content\/uploads\/2017\/02\/connect_ultrasonic_senor_proto_bit-300x206.jpg\" width=\"300\" height=\"206\" srcset=\"https:\/\/home.et.utwente.nl\/slootenvanf\/wp-content\/uploads\/2017\/02\/connect_ultrasonic_senor_proto_bit-300x206.jpg 300w, https:\/\/home.et.utwente.nl\/slootenvanf\/wp-content\/uploads\/2017\/02\/connect_ultrasonic_senor_proto_bit-768x526.jpg 768w, https:\/\/home.et.utwente.nl\/slootenvanf\/wp-content\/uploads\/2017\/02\/connect_ultrasonic_senor_proto_bit.jpg 1000w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Remove the middle jumper of the Proto-bit, otherwise it&#8217;s input will be connected to the output.<br \/>\nConnect the <em>echo-pin<\/em> of the ultrasonic sensor to the Proto-bit output (top middle connector): <span style=\"color: #ff0000;\">red wire<\/span>.<br \/>\nConnect the <em>trig-pin<\/em> of the ultrasonic sensor to Proto-bit input (bottom middle connector): <span style=\"color: #ff9900;\">orange wire<\/span>.<br \/>\nConnect Vcc (<span style=\"color: #ffff00;\">yellow wire<\/span>) and GND (<span style=\"color: #993300;\">brown wire<\/span>).<\/p>\n<h2>Build circuit as shown<\/h2>\n<p><a class=\"strip\" data-strip-group=\"present\" href=\"https:\/\/home.et.utwente.nl\/slootenvanf\/wp-content\/uploads\/2017\/02\/ultrasonic_distance_measure.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-679 size-large alignnone\" src=\"https:\/\/home.et.utwente.nl\/slootenvanf\/wp-content\/uploads\/2017\/02\/ultrasonic_distance_measure-1024x357.jpg\" width=\"604\" height=\"211\" srcset=\"https:\/\/home.et.utwente.nl\/slootenvanf\/wp-content\/uploads\/2017\/02\/ultrasonic_distance_measure-1024x357.jpg 1024w, https:\/\/home.et.utwente.nl\/slootenvanf\/wp-content\/uploads\/2017\/02\/ultrasonic_distance_measure-300x105.jpg 300w, https:\/\/home.et.utwente.nl\/slootenvanf\/wp-content\/uploads\/2017\/02\/ultrasonic_distance_measure-768x268.jpg 768w, https:\/\/home.et.utwente.nl\/slootenvanf\/wp-content\/uploads\/2017\/02\/ultrasonic_distance_measure.jpg 2028w\" sizes=\"auto, (max-width: 604px) 100vw, 604px\" \/><\/a><\/p>\n<p>Make sure the switch of the Number-bit is set to &#8220;value&#8221;.<br \/>\nMake sure a Wire (w1) is connecting the &#8216;in&#8217; side of the Proto-bit to output <em>d1\/tx<\/em> of the Arduino-bit.<\/p>\n<h2>Program Arduino-bit<\/h2>\n<p>The program used for this example is shown below. Connect the Arduino to your computer with the USB cable.<br \/>\nTurn on the Power-bit (the Arduino-bit does <em>not<\/em> get power via the USB port!).<br \/>\nOn your computer, start the Arduino IDE (you can <a href=\"https:\/\/www.arduino.cc\/\" target=\"_blank\" rel=\"noopener noreferrer\">download it here<\/a>).<br \/>\nSet the board to &#8220;Arduino Leonardo&#8221; (<em>Tools &gt; Board<\/em>).<br \/>\nSet the proper COM port (<em>Tools &gt; Port<\/em>).<br \/>\nStart a new Sketch (<em>File &gt; New<\/em>) and copy the example program in to the Arduino IDE.<br \/>\nSave, then press the Upload button to send the program to the Arduino-bit and execute it.<br \/>\nStart the serial monitor (<em>Tools &gt; Serial Monitor<\/em>) to see values output there.<\/p>\n<pre style=\"height:300px;\"><code>\/\/ Define pin numbers for input\/outputs\n#define IN_ECHO  0\n#define OUT_TRIG 1\n#define OUT_NUMBER 5\n\nvoid setup() \n{\n  \/\/ Pin configuration\n  pinMode(IN_ECHO, INPUT);\n  pinMode(OUT_TRIG, OUTPUT);\n  pinMode(OUT_NUMBER, OUTPUT);\n\n  \/\/ Pin initialization\n  digitalWrite(OUT_TRIG, LOW);\n  analogWrite(OUT_NUMBER, 0);\n\n  \/\/ open the serial port at 9600 bps:\n  Serial.begin(9600);\n}\n\nvoid loop() \n{\n  int distance;\n\n  distance = distance_measure();\n\n  \/\/ display the distance in the serial monitor:\n  Serial.println(distance);\n\n  \/\/ send the distance to the number-bit:\n  analogWrite(OUT_NUMBER, distance * 2.55 ); \/\/ convert 0-100cm to analog value of 0-255\n\n  delay(60);\n}\n                                                                                                                                                                                                                \n\nint distance_measure()\n\/* Measure distance *\/\n{\n  int echo_state;\n  int start_time;\n  int end_time;\n  int distance;\n\n  \/\/ Trigger input\n  digitalWrite(OUT_TRIG, HIGH);\n  delayMicroseconds(12);\n  digitalWrite(OUT_TRIG, LOW);\n\n  \/\/ Wait while echo is low\n  do\n  {\n    echo_state = digitalRead(IN_ECHO);\n  } while(echo_state == LOW);\n\n  \/\/ Get the start time\n  start_time = micros();\n\n  \/\/ Wait while echo is high\n  do {\n    echo_state = digitalRead(IN_ECHO);\n  } while(echo_state == HIGH);\n\n  \/\/ Get the end time\n  end_time = micros();\n\n  \/\/ Get the distance in centimeters\n  distance = (end_time - start_time) \/ 58;\n\n  return distance;    \n}\n<\/code><\/pre>\n<h2>More info<\/h2>\n<p><a href=\"https:\/\/www.youtube.com\/watch?v=PG2VhpkPqoA\" target=\"_blank\" rel=\"noopener noreferrer\">Learn how an Ultrasonic sensor works and use with Arduino<\/a><\/p>\n<p><!-- load the strip-lightbox: --><br \/>\n<script src=\"https:\/\/home.et.utwente.nl\/slootenvanf\/div\/strip\/js\/strip.pkgd.min.js\"><\/script>\n \t<link rel=\"stylesheet\" id=\"strip-style-css\" href=\"https:\/\/home.et.utwente.nl\/slootenvanf\/div\/strip\/css\/strip.css\" type=\"text\/css\" media=\"all\">\n","protected":false},"excerpt":{"rendered":"<p>By utilizing the Arduino-bit and the Proto-bit, all kinds of electronic circuits and components can be connected to a Littlebits circuit. In this example, we connect an Ultrasonic sensor to the Arduino-bit with the Proto-bit. The distance measured by the Ultrasonic sensor will be displayed on the Number-bit. This example is based on the Bat [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":685,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[3],"tags":[94,228,92,135,93,134,227,133],"class_list":["post-676","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-education","tag-arduino","tag-distance","tag-electronics","tag-hc-sr04","tag-littlebits","tag-proto-bit","tag-ultrasonic","tag-ultrasonic-senor"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Build a distance-sensor with LittleBits - vanslooten.com<\/title>\n<meta name=\"description\" content=\"Build a distance-sensor with LittleBits\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/home.et.utwente.nl\/slootenvanf\/2017\/02\/10\/build-distance-sensor-littlebits\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Build a distance-sensor with LittleBits - 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