{"id":8677,"date":"2014-03-12T17:54:30","date_gmt":"2014-03-12T17:54:30","guid":{"rendered":"http:\/\/178.62.14.192\/?p=8677"},"modified":"2014-03-12T17:54:30","modified_gmt":"2014-03-12T17:54:30","slug":"seven-segments-of-pi-from-jamboree-to-camjam-part-3","status":"publish","type":"post","link":"https:\/\/www.recantha.co.uk\/blog\/?p=8677","title":{"rendered":"Seven Segments of Pi – From Jamboree to CamJam (Part 3)"},"content":{"rendered":"

\"FromJamboreeToCamJam_Banner\"<\/a><\/span><\/p>\n

After last week’s\u2026<\/span><\/p>\n

\"jamboreegrab2\"<\/a><\/p>\n

I have returned with more ideas for Raspberry Pi add-ons\u2026but they might have to wait until 2015! I am going to be busy this year getting \u201cThe PiTrol\u201d and \u201cPiDapter\u201d ready\u2026but I found some willing pupils who I met at the Jamboree keen to test-drive these kits!<\/p>\n

Now back to 2012! I had just started going into schools with my shiny new Raspberry Pi only to get the response\u2026<\/p>\n

\"but_what_does_it_do\"<\/a><\/p>\n

“Yes! …but what does it do!?”<\/strong><\/p>\n

This spurred me into action. I had to make it \u201cdo\u201d something to gain their interest! Thanks to my colleagues at work I had decided to try and hook the Raspberry Pi up to a Seven Segment Display using the Raspberry Pi\u2019s GPIO Pins.<\/p>\n

The GPIO Pins are a feature of the Raspberry Pi which sets it apart from a \u201cnormal\u201d PC. Connecting to the GPIO Pins allows you to directly control other electronics, something that was possible on the BBC Micro<\/p>\n

\"BBC_Micro\"<\/a><\/p>\n

\u2026in the 1980\u2019s but became difficult to do on a \u201cnormal\u201d PC in the 1990\u2019s! (And if attempted, would be frowned upon by most parents!)<\/p>\n

Part 3 \u201cBuilding the Segments of Pi\u201d<\/strong><\/p>\n

Rummaging through my boxes of old bits of electronics dating back to my time at Sheffield University I found a Seven Segment Display board I had built on Vero Board. I salvaged the 12mm Seven Segment Display and plugged it into a Breadboard. After downloading the Raspberry Pi Schematics I found the \u201cP1 Connector\u201d had 7 GPIO, labelled GPIO_GEN0 to 6. Just the right number for my display!<\/p>\n

In the Dark Ages of 2012 no one seemed to have invented a convenient way to connect the Raspberry Pi\u2019s \u201cP1\u201d Connector to a Breadboard (The Adafruit Pi Cobbler adapter\u2026<\/p>\n

\"AdafruitPiCobbler\"<\/a><\/p>\n

\u2026came along some months later!) So I rigged up a \u201cHeath-Robinson\u201d Ribbon Cable to connect my Raspberry Pi to the Breadboard and I had\u2026<\/p>\n

\"SevenSegmentsMarkI\"<\/a><\/p>\n

Seven Segments of Pi Mark I<\/strong><\/p>\n

I now just had the small matter of how to drive the GPIO from software! A few Google Searches later it was clear \u201cPython\u201d was the programming language of choice for the Raspberry Pi when using the \u201cDebian\u201d Operating System. I then found Simon Monk\u2019s instructions\u2026<\/p>\n

\"Monk_Makes\"<\/a><\/p>\n

\u2026showing how to control the GPIO from \u201cPython\u201d. Following his instructions I downloaded the RPi.GPIO Python Library (this is now pre-installed in the Raspbian Operating System) and found I needed to be logged-in as \u201cSuper User\u201d (sometimes referred to \u201cSupervisor\u201d \u201cAdministrator\u201d or \u201csudo\u201d)<\/p>\n

I tried toggling GPIO_GEN0 as GPIO.output(0) in my \u201cPython\u201d software.
\nNothing happened!<\/strong><\/p>\n

Looking at the Schematics I found GPIO_GEN0 was actually GPIO17 from the Broadcom chip. I tried toggling GPIO_GEN0 as GPIO.output(17) in my \u201cPython\u201d software.
\nStill nothing happened!<\/strong><\/p>\n

A few more Google Searches later and I found that the \u201cPython\u201d Library references the GPIO by their \u201cP1 Connector\u201d Pin Number (not the schematic signal name nor the Broadcom GPIO number) so GPIO_GEN0 is GPIO.output(11)!
\nIt now worked! I had control of my Seven Segment Display!<\/strong><\/p>\n

<\/strong>There was one slight problem! I needed to set the GPIO to \u201cFalse\u201d to turn the Segments \u201con\u201d and \u201cTrue\u201d to turn them \u201coff\u201d! That would be sure to cause confusion in the Classroom! So it was time for\u2026<\/p>\n

\"SevenSegmentsMarkII\"<\/a><\/p>\n

Seven Segments of Pi Mark II<\/strong><\/p>\n

A larger \u201ccommon anode\u201d Seven Segment Display driven by an Inverting Buffer now meant \u201cTrue\u201d turned it \u201con\u201d and \u201cFalse\u201d turned it \u201coff\u201d! Two IDC Connectors on the Ribbon Cable allowed me to connect to the Breadboard in a more elegant way, and with the addition of a single PushButton as a GPIO.input I had something I could take back into schools.<\/p>\n

I was still limited by having just one Raspberry Pi, but this time after my presentation I gave the pupils the chance to get their hands on the \u201cPi\u201d!
\nI had written a Python Program that displayed the numbers 1,2,3 in sequence on the Seven Segment display when the PushButton was pressed\u2026<\/p>\n

\"SevenSegmentsOneTwoThree_Thumbnail\"<\/a><\/p>\n

Download the code<\/a><\/p>\n

Three pupils stayed behind to take a closer look. I showed them the Python software and said \u201cSee if you can make it count to 4!\u201d<\/span><\/p>\n

They had never written any software before but they were off!
\nThey quickly defined a new function called \u201cfour\u201d and realised that to display the number \u201c4\u201d on a Seven Segment Display segments b,c,f & g must be \u201cTrue\u201d. The rest must be \u201cFalse\u201d\u2026<\/p>\n

\"Seven_Segments_of_Pi_Assy_LED1_with_Letters\"<\/a><\/p>\n

But it still didn\u2019t count to \u201c4\u201d! They had not called the function \u201cfour\u201d!<\/p>\n

A few syntax errors later and there was a \u201cYessss!\u201d from the other side of the classroom. They had made it count to 4!!!<\/p>\n

\"Seven_Segments_of_Pi_Assy_LED_Displaying_4\"<\/a><\/p>\n

\u2026and now they wanted to make it count to 5! \u2026but it was 5.30pm and the teacher needed to lock up the Classroom! \u201cJust give us a few more minutes so we can make it count to 5\u201d they said. That was the moment I realised this simple idea of hooking the Raspberry Pi up to a Seven Segment Display \u201cworked\u201d! It was simple enough for someone new to programming to understand, but challenging enough to be satisfying when it \u201cworked\u201d! Now all I needed was a more comprehensive set of Software Challenges plus a few more Raspberry Pi\u2019s and I could run Raspberry Pi Workshops in Schools!<\/p>\n

Next week I will look at some of the technical barriers to using the Raspberry Pi in the classroom in a Blog entitled<\/p>\n

\u201dYes! …but all our monitors are VGA!\u201d<\/strong><\/p>\n

If you are interested in learning more about the Seven Segments of Pi visit my Web Site www.SevenSegmentsOfPi.com<\/a> or watch the \u201cSeven Segments of Pi\u201d YouTube Video<\/a>. You can also watch Carrie Anne Philbin playing \u201cFigure Eight My Pi\u201d<\/a> at the CamJam, courtesy of Alex at RasPi TV.<\/p>\n

\"NevilHuntPhoto_QuarterSize\"<\/a><\/p>\n

Nevil Hunt<\/p>\n

Innovations in Education<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

After last week’s\u2026 I have returned with more ideas for Raspberry Pi add-ons\u2026but they might have to wait until 2015! I am going to be busy this year getting \u201cThe PiTrol\u201d and \u201cPiDapter\u201d ready\u2026but I found some willing pupils who…<\/p>\n

Read more →<\/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":[20],"tags":[],"class_list":["post-8677","post","type-post","status-publish","format-standard","hentry","category-gpio-boards"],"yoast_head":"\nSeven Segments of Pi - From Jamboree to CamJam (Part 3) - 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=8677\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Seven Segments of Pi - From Jamboree to CamJam (Part 3) - Raspberry Pi Pod\" \/>\n<meta property=\"og:description\" content=\"After last week’s\u2026 I have returned with more ideas for Raspberry Pi add-ons\u2026but they might have to wait until 2015! I am going to be busy this year getting \u201cThe PiTrol\u201d and \u201cPiDapter\u201d ready\u2026but I found some willing pupils who…Read more →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.recantha.co.uk\/blog\/?p=8677\" \/>\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=\"2014-03-12T17:54:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2014\/04\/FromJamboreeToCamJam_Banner1.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=\"5 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=8677#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.recantha.co.uk\/blog\/?p=8677\"},\"author\":{\"name\":\"Michael Horne\",\"@id\":\"https:\/\/www.recantha.co.uk\/blog\/#\/schema\/person\/c27c4ef2ee1c18b130f1fcd5dcdbb263\"},\"headline\":\"Seven Segments of Pi – From Jamboree to CamJam (Part 3)\",\"datePublished\":\"2014-03-12T17:54:30+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.recantha.co.uk\/blog\/?p=8677\"},\"wordCount\":976,\"commentCount\":1,\"publisher\":{\"@id\":\"https:\/\/www.recantha.co.uk\/blog\/#organization\"},\"articleSection\":[\"GPIO boards\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.recantha.co.uk\/blog\/?p=8677#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.recantha.co.uk\/blog\/?p=8677\",\"url\":\"https:\/\/www.recantha.co.uk\/blog\/?p=8677\",\"name\":\"Seven Segments of Pi - 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If you want to find out more about the successful teaching of Computing in schools, this\u2026","rel":"","context":"In "Education"","block_context":{"text":"Education","link":"https:\/\/www.recantha.co.uk\/blog\/?cat=17"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":9772,"url":"https:\/\/www.recantha.co.uk\/blog\/?p=9772","url_meta":{"origin":8677,"position":1},"title":"#RaspberryPi features in this month’s Linux Format","author":"Michael Horne","date":"23 May 2014","format":false,"excerpt":"Linux Format this month is a good one for Raspberry Pi owners. It features the following: A (very positive) review of Sonic Pi. A small box-out about using the Pi as a media centre. An extensive feature by Les Pounder\u00a0from the Raspberry Jamboree in March including interviews with: Martin O'Hanlon,\u2026","rel":"","context":"In "Magazines"","block_context":{"text":"Magazines","link":"https:\/\/www.recantha.co.uk\/blog\/?cat=29"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.linuxformat.com\/files\/lxf_covers\/185-big.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":12200,"url":"https:\/\/www.recantha.co.uk\/blog\/?p=12200","url_meta":{"origin":8677,"position":2},"title":"Raspberry Jamboree 2015 – NEXT WEEK!","author":"Michael Horne","date":"14 March 2015","format":false,"excerpt":"This year's Raspberry Jamboree is\u00a0next week\u00a0at\u00a0Our Lady's Catholic High School, Preston, PR2 3SQ. It is a three-day event in which people of\u00a0all ages and all levels of experience come together and celebrate all things Pi. Friday (during the day) - 9am-4pm - Free Teacher CPD The aim of this one\u2026","rel":"","context":"In "Events"","block_context":{"text":"Events","link":"https:\/\/www.recantha.co.uk\/blog\/?cat=19"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2015\/03\/JamLogo.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2015\/03\/JamLogo.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2015\/03\/JamLogo.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2015\/03\/JamLogo.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":8201,"url":"https:\/\/www.recantha.co.uk\/blog\/?p=8201","url_meta":{"origin":8677,"position":3},"title":"Seven Segments of Pi – From Raspberry Jamboree to CamJam (Part 2)","author":"Michael Horne","date":"5 March 2014","format":false,"excerpt":"This week I was going to talk about VGA Adapters for the Raspberry Pi but about 10 days ago Mike emailed me to say \u201cAre you going to the Manchester Jamboree?\u201d I must admit at the time it wasn\u2019t on my radar! So I looked up the Web Site and\u2026","rel":"","context":"In "Education"","block_context":{"text":"Education","link":"https:\/\/www.recantha.co.uk\/blog\/?cat=17"},"img":{"alt_text":"FromJamboreeToCamJam_Banner","src":"\/blog\/wp-content\/uploads\/2014\/04\/FromJamboreeToCamJam_Banner1.jpg","width":350,"height":200},"classes":[]},{"id":8100,"url":"https:\/\/www.recantha.co.uk\/blog\/?p=8100","url_meta":{"origin":8677,"position":4},"title":"Great photos and video from the Raspberry Jamboree – #RJamboree #RaspberryPi","author":"Michael Horne","date":"2 March 2014","format":false,"excerpt":"Alex Eames took his Pi-plus-screen-plus-camera set-up to the Raspberry Jamboree last week and took some great pictures. He also grabbed some video of the party at the end of the event and has edited it together. So, if you attended the Jamboree see if you can spot yourself! See the\u2026","rel":"","context":"In "Raspberry Jamborees"","block_context":{"text":"Raspberry Jamborees","link":"https:\/\/www.recantha.co.uk\/blog\/?cat=40"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/pbs.twimg.com\/media\/BhjxrFkIgAA4Ki5.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/pbs.twimg.com\/media\/BhjxrFkIgAA4Ki5.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/pbs.twimg.com\/media\/BhjxrFkIgAA4Ki5.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":2337,"url":"https:\/\/www.recantha.co.uk\/blog\/?p=2337","url_meta":{"origin":8677,"position":5},"title":"Article on the Raspberry Jamboree","author":"Michael Horne","date":"20 February 2013","format":false,"excerpt":"Interesting article and interview snippets about the partnership between Jamboree organiser Alan O'Donohoe and CPC\/Farnell. CPC partners with ICT teacher Alan O'Donohoe to feed Raspberry Pi to teachers hungry for skills to avoid ICT education crisis | The Drum.","rel":"","context":"In "Education"","block_context":{"text":"Education","link":"https:\/\/www.recantha.co.uk\/blog\/?cat=17"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/8677","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=8677"}],"version-history":[{"count":0,"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/8677\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8677"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8677"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.recantha.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8677"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}