{"id":608,"date":"2015-09-06T22:30:42","date_gmt":"2015-09-06T20:30:42","guid":{"rendered":"http:\/\/heppg.de\/ikg\/wordpress\/?p=608"},"modified":"2015-09-07T21:26:56","modified_gmt":"2015-09-07T19:26:56","slug":"remote-scratch-connection-multipanel-setup","status":"publish","type":"post","link":"https:\/\/heppg.de\/ikg\/wordpress\/?p=608","title":{"rendered":"Remote scratch connection, 2×3 multipanel setup"},"content":{"rendered":"

With scratchClient, it is possible to connect multiple scratch instances with events. ScratchClient can combine this feature with other adapters, as GPIO or alike.<\/p>\n

To demonstrate a ‘chain reaction’ type application, I have connected six scratch screens in a 2*3-array to have a red dot traverse the screens.
\n\"\"
\nAs I do not own 6 hdmi-monitors for scratch,\u00a0I have collected 6 vnc-sessions with 600*400-resolution on a desktop computer. The video is taken from this machine.<\/p>\n

Each scratch instance sends a specific start broadcast to the next scratch instance to trigger the display-move-hide sequence there. So Instance 0 sends ‘start_1’, instance 1 sends ‘start_2’ and so on. Instance 5 sends ‘start_0’ and the sequence starts again.<\/p>\n

The sample is in the scratchClient-distribution, scratch\/chainReaction-folder. If you want to run this sample, you need six raspberry computers. Start scratch\/chainReaction\/reaction_0.sb on each of the raspberryPi. Change the value of ‘whoami’ to 0, 1, 2.. 5 and arrange the screens in<\/p>\n

0, 1, 2
\n5, 4, 3<\/p>\n

order.<\/p>\n

On one of the computers, the scratchCommunicationServer needs to be started.<\/p>\n

cd\u00a0 ~\/scratchClient\r\npython src\/scratchCommunicationServer.py<\/pre>\n
For each of the computers, there is a distinct computer-specific config script. Adjust the<\/p>\n
\u00a0<parameter name=\"server\" value=\"192.168.2.90\" \/>\r\n<\/pre>\n
in the config-files to match the ip-address of the server computer.<\/p>\n
For computer 0, use config_start_0.xml:<\/p>\n
cd\u00a0 ~\/scratchClient\r\nsudo python src\/scratchClient.py -c scratch\/chainReaction\/config_start_0.xml<\/pre>\n
and start scratchClient on other computers with config_start_<N>.xml, N=1..5.<\/p>\n
The remote connection adapter can be combined with other adapters like GPIO or whatever needed. This is the reason to start the python application with sudo.<\/p>\n
The current configuration combines the remote communication adapter with a GPIO output on GPIO18. This is a feature unique to scratchClient.<\/p>\n","protected":false},"excerpt":{"rendered":"
With scratchClient, it is possible to connect multiple scratch instances with events. ScratchClient can combine this feature with other adapters, as GPIO or alike. To demonstrate a ‘chain reaction’ type application, I have connected six scratch screens in a 2*3-array to have a red dot traverse the screens. As I do not own 6 hdmi-monitors […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,3],"tags":[],"class_list":["post-608","post","type-post","status-publish","format-standard","hentry","category-scratch","category-scratchclient"],"_links":{"self":[{"href":"https:\/\/heppg.de\/ikg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/608","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/heppg.de\/ikg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/heppg.de\/ikg\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/heppg.de\/ikg\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/heppg.de\/ikg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=608"}],"version-history":[{"count":5,"href":"https:\/\/heppg.de\/ikg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/608\/revisions"}],"predecessor-version":[{"id":613,"href":"https:\/\/heppg.de\/ikg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/608\/revisions\/613"}],"wp:attachment":[{"href":"https:\/\/heppg.de\/ikg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=608"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/heppg.de\/ikg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=608"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/heppg.de\/ikg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=608"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}