{"id":861,"date":"2012-12-01T14:21:53","date_gmt":"2012-12-01T14:21:53","guid":{"rendered":"http:\/\/178.62.14.192\/?p=861"},"modified":"2021-07-02T15:17:16","modified_gmt":"2021-07-02T14:17:16","slug":"pipodcorder-and-a-proto-plate-project-update","status":"publish","type":"post","link":"https:\/\/www.recantha.co.uk\/blog\/?p=861","title":{"rendered":"Picorder and a Proto-Plate &#8211; project update"},"content":{"rendered":"<p><img data-recalc-dims=\"1\" decoding=\"async\" class=\"alignright\" src=\"https:\/\/i0.wp.com\/www.ezoneda.com\/images\/LCD%20screen%20display\/LC001.jpg?w=560\" alt=\"\" \/><\/p>\n<p>The <a href=\"https:\/\/www.recantha.co.uk\/blog\/?cat=37\">Picorder project<\/a> has been progressing, albeit slowly. So far, I&#8217;ve managed to add the following items to my Pi:<\/p>\n<ul>\n<li style=\"text-align: left;\"><a href=\"http:\/\/www.ebay.co.uk\/sch\/i.html?_nkw=hd44780&amp;_sacat=0&amp;_odkw=lead+solder&amp;_osacat=0&amp;_from=R40\">a\u00a016&#215;2 LCD board<\/a><\/li>\n<li>a TMP102 temperature sensor<\/li>\n<li>an SR-04 ultrasonic distance sensor<\/li>\n<\/ul>\n<div>Coming up is my first foray into analog-to-digital conversion using an <a href=\"http:\/\/www.adafruit.com\/products\/856\">MCP3008 ADC chip<\/a> with things like a <a href=\"http:\/\/en.wikipedia.org\/wiki\/Photoresistor\">light detecting resistor<\/a> and a <a href=\"http:\/\/www.bitsbox.co.uk\/sensors.html#humid\">humidity sensor<\/a>.<\/div>\n<p>To start with, I constructed my circuits on a breadboard. This was fine, but I decided I wanted something more permanent and less prone to accidents. Breadboarding is great if you want to be able to easily move wires around when you make a mistake, but of course it also means that the wires come out very easily.<\/p>\n<p><a href=\"http:\/\/www.bitbang.co.uk\/proto-plate_1_1.html\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignleft\" title=\"Bit Bang Proto Plate, fitted to a Raspberry Pi\" src=\"https:\/\/i0.wp.com\/bitbang.co.uk\/IMAGES\/web\/Proto-Plate_board_R1_1_Side1_TH.png?resize=350%2C204\" alt=\"\" width=\"350\" height=\"204\" \/><\/a>For this, I went with a\u00a0<a href=\"http:\/\/www.bitbang.co.uk\/proto-plate_1_1.html\">Proto-Plate<\/a> from <a href=\"http:\/\/www.bitbang.co.uk\/\">BitBang.co.uk<\/a>. The board is very solid, very well-made and has a decent-sized prototyping area. The best thing is that the surface area fits within the Pi&#8217;s footprint. The components I added don&#8217;t, as you&#8217;ll see from the pictures below, but this was never my main concern.<\/p>\n<p>Soldering connections on the board led me to use fine <a href=\"http:\/\/www.ebay.co.uk\/sch\/i.html?_trksid=p5197.m570.l1313&amp;_nkw=lead+solder&amp;_sacat=0&amp;_from=R40\">lead solder<\/a>. This gave me much quicker soldering times and connections that were easier to manage, not mention giving me much tidier results. (Thanks to Peter Onion&#8217;s masterclass at the <a href=\"http:\/\/peteronion.org.uk\/smf\/\">Milton Keynes Raspberry Jam<\/a>, I&#8217;m now soldering properly too.)<\/p>\n<p>Even with the fine solder and improved technique, my wiring (see below) is still a bit untidy, but it has done the job and I&#8217;m rather proud of being able to get it working eventually.<\/p>\n<p>I say eventually&#8230; Having followed a tutorial on connecting the LCD and found the appropriate resistance for the backlight using a potentiometer, I naturally replaced the pot with a normal resistor. This should have worked&#8230; but didn&#8217;t. The LCD stubbornly refused to work; It lit up, but no text appeared on it when I ran my scripts. Cue much usage of a multimeter to determine if I&#8217;d made the connections correctly. I eventually tracked down the problem and found that, rather than supplying a resistance between the backlight pin and a live contact, the connection should instead be made from the pin to the <em>ground<\/em>. I&#8217;m still not totally sure why, exactly, but rewiring the board to do this finally made it work correctly. The irony is that if I had realised this when I first constructed the circuit, it would have worked first time.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-884 alignleft\" title=\"SAMSUNG\" src=\"\/blog\/wp-content\/uploads\/2012\/11\/261120120021-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2012\/11\/261120120021.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2012\/11\/261120120021.jpg?resize=1024%2C768&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2012\/11\/261120120021.jpg?w=1120&amp;ssl=1 1120w, https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2012\/11\/261120120021.jpg?w=1680&amp;ssl=1 1680w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>My Picorder (see picture, left) now measures the temperature of the room (well, that part of the room that is near the sensor anyway!) and displays it on the LCD screen.<\/p>\n<p>My next task is to modify the Python script that runs the thing to do an active ultrasonic &#8216;ping&#8217; to measure distance (this part is already done) and display it on screen (this part isn&#8217;t).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Picorder project has been progressing, albeit slowly. So far, I&#8217;ve managed to add the following items to my Pi: a\u00a016&#215;2 LCD board a TMP102 temperature sensor an SR-04 ultrasonic distance sensor Coming up is my first foray into analog-to-digital&hellip;<\/p>\n<p class=\"more-link-p\"><a class=\"more-link\" href=\"https:\/\/www.recantha.co.uk\/blog\/?p=861\">Read more &rarr;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[50,32,37,42],"tags":[],"class_list":["post-861","post","type-post","status-publish","format-standard","hentry","category-making","category-my-projects","category-picorder","category-raspberry-pi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Picorder and a Proto-Plate - project update - Raspberry Pi Pod<\/title>\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.recantha.co.uk\/blog\/?p=861\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Picorder and a Proto-Plate - project update - Raspberry Pi Pod\" \/>\n<meta property=\"og:description\" content=\"The Picorder project has been progressing, albeit slowly. So far, I&#8217;ve managed to add the following items to my Pi: a\u00a016&#215;2 LCD board a TMP102 temperature sensor an SR-04 ultrasonic distance sensor Coming up is my first foray into analog-to-digital&hellip;Read more &rarr;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.recantha.co.uk\/blog\/?p=861\" \/>\n<meta property=\"og:site_name\" content=\"Raspberry Pi Pod\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/recantha\/\" \/>\n<meta property=\"article:published_time\" content=\"2012-12-01T14:21:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-07-02T14:17:16+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.ezoneda.com\/images\/LCD%20screen%20display\/LC001.jpg\" \/>\n<meta name=\"author\" content=\"Michael Horne\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@recantha\" \/>\n<meta name=\"twitter:site\" content=\"@recantha\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Michael Horne\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.recantha.co.uk\/blog\/?p=861#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.recantha.co.uk\/blog\/?p=861\"},\"author\":{\"name\":\"Michael Horne\",\"@id\":\"https:\/\/www.recantha.co.uk\/blog\/#\/schema\/person\/c27c4ef2ee1c18b130f1fcd5dcdbb263\"},\"headline\":\"Picorder and a Proto-Plate &#8211; 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the Picorder","author":"Michael Horne","date":"6 March 2013","format":false,"excerpt":"This project has been in progress since I first received my Raspberry Pi last July. Until now, I just haven't had the time to record video. The Picorder is a Pi\/Arduino combination taking readings from 2 temperature sensors, a hall-effect magnetism sensor and an ultrasonic distance sensor which it then\u2026","rel":"","context":"In &quot;Arduino&quot;","block_context":{"text":"Arduino","link":"https:\/\/www.recantha.co.uk\/blog\/?cat=55"},"img":{"alt_text":"SAMSUNG","src":"\/blog\/wp-content\/uploads\/2013\/03\/060320131-300x225.jpg","width":350,"height":200},"classes":[]},{"id":6550,"url":"https:\/\/www.recantha.co.uk\/blog\/?p=6550","url_meta":{"origin":861,"position":1},"title":"Experimenting with the Easy Pulse and #RaspberryPi","author":"Michael Horne","date":"19 October 2013","format":false,"excerpt":"As part of my Picorder\u00a0project, I bought an Easy Pulse from Embedded Lab (via Elecrow). It's a red PCB with a plugin fingertip sensor (see above). The\u00a0example code you can download is in C and my Picorder code is in Python. Plus, their code does a lot of messing about\u2026","rel":"","context":"In &quot;GPIO boards&quot;","block_context":{"text":"GPIO boards","link":"https:\/\/www.recantha.co.uk\/blog\/?cat=20"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/embedded-lab.com\/blog\/wp-content\/uploads\/2013\/06\/EasyPulseV1.1Board3.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/embedded-lab.com\/blog\/wp-content\/uploads\/2013\/06\/EasyPulseV1.1Board3.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/embedded-lab.com\/blog\/wp-content\/uploads\/2013\/06\/EasyPulseV1.1Board3.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":4911,"url":"https:\/\/www.recantha.co.uk\/blog\/?p=4911","url_meta":{"origin":861,"position":2},"title":"Picorder, version 2 &#8211; #RaspberryPi has sensor-y overload","author":"Michael Horne","date":"2 July 2013","format":false,"excerpt":"Pardon the pun in the title, couldn't resist. Here is a two-part video I've just shot of the Picorder version 2. I'm just about to work on version 3, so it seemed the perfect time to document my work so far. Part 1: Part 2 Here's a list of the\u2026","rel":"","context":"With 8 comments","block_context":{"text":"With 8 comments","link":"https:\/\/www.recantha.co.uk\/blog\/?p=4911#comments"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":51,"url":"https:\/\/www.recantha.co.uk\/blog\/?p=51","url_meta":{"origin":861,"position":3},"title":"Picorder &#8211; Raspberry Pi-powered Tricorder","author":"Michael Horne","date":"1 October 2012","format":false,"excerpt":"Long-term hardware project: a Raspberry Pi tricorder. It's not exactly a novel idea, but it gives me the opportunity to merge my software skills with the hardware side of the Pi, which I'm just learning. PHASE 1 - Tricorder BASICS Battery-powered Raspberry Pi with 3.5mm (or larger) screen. Additional diagnostics\u2026","rel":"","context":"In &quot;Making&quot;","block_context":{"text":"Making","link":"https:\/\/www.recantha.co.uk\/blog\/?cat=50"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/deskarati.com\/wp-content\/uploads\/2012\/01\/tricorder-star-trek.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":21005,"url":"https:\/\/www.recantha.co.uk\/blog\/?p=21005","url_meta":{"origin":861,"position":4},"title":"The PicoPicorder &#8211; a work-in-progress prototype using a Raspberry Pi Pico and lots of components from Pimoroni and Adafruit!","author":"Michael Horne","date":"5 April 2021","format":false,"excerpt":"During March, and for the past week as well, I've been working on the latest iteration of my Picorder project. This project, which has been my \"go-to project\" for the past 9 years (gulp!) is now running from a Raspberry Pi Pico and uses lots and lots of sensors and\u2026","rel":"","context":"In &quot;Audio&quot;","block_context":{"text":"Audio","link":"https:\/\/www.recantha.co.uk\/blog\/?cat=4"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2021\/04\/PicoPicorder-prototyping-stage_sm.jpg?fit=1200%2C898&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2021\/04\/PicoPicorder-prototyping-stage_sm.jpg?fit=1200%2C898&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2021\/04\/PicoPicorder-prototyping-stage_sm.jpg?fit=1200%2C898&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2021\/04\/PicoPicorder-prototyping-stage_sm.jpg?fit=1200%2C898&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2021\/04\/PicoPicorder-prototyping-stage_sm.jpg?fit=1200%2C898&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":279,"url":"https:\/\/www.recantha.co.uk\/blog\/?p=279","url_meta":{"origin":861,"position":5},"title":"Picorder update: and so it goes&#8230;","author":"Michael Horne","date":"22 October 2012","format":false,"excerpt":"For those not aware of the Picorder project, read more here. As with all best laid plans, they are susceptible to Murphy's Law - all that can go wrong, will go wrong. I was just about to go out to the Cambridge Raspberry Jam, with all my work on the\u2026","rel":"","context":"In &quot;Picorder&quot;","block_context":{"text":"Picorder","link":"https:\/\/www.recantha.co.uk\/blog\/?cat=37"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2012\/10\/PiPod-Logo21.png?fit=1015%2C412&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2012\/10\/PiPod-Logo21.png?fit=1015%2C412&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2012\/10\/PiPod-Logo21.png?fit=1015%2C412&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2012\/10\/PiPod-Logo21.png?fit=1015%2C412&ssl=1&resize=700%2C400 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/861","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=861"}],"version-history":[{"count":3,"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/861\/revisions"}],"predecessor-version":[{"id":21118,"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/861\/revisions\/21118"}],"wp:attachment":[{"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=861"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}