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Tracking Environmental Data with TPS and Keen.IO

Posted 01-26-2017 at 09:26 AM by Dmitry_Slepov

About the Application
  • Keen.IO is a cloud platform that provides data collection and analysis services via the REST API. Keen offers SDKs for many programming languages, including browser-side JavaScript and Node.js.
  • In this tutorial we used Tibbit #30 (ambient humidity and temperature meter) for collecting environmental data and storing it on the Keen.IO server.
  • A very simple in-browser application is used for fetching data from Keen.IO and displaying charts in the browser window (the
...
LQ Newbie
Posted in Uncategorized
Views 153 Comments 0 Dmitry_Slepov is offline
Old

Simple Card-based Access Control

Posted 01-25-2017 at 08:00 AM by Dmitry_Slepov

About the Application

This project implements a very common access control device. The LTPS is equipped with Tibbit #08 (clock/data and Wiegand interface). It gets card codes from an external RFID card reader. The project lets you save user names and their ID codes into the database, as well as verify the cards you read against the records of the database. When you read a card which ID code matches any ID code from the database, the terminal "grants access" (the blue LED...
LQ Newbie
Posted in Uncategorized
Views 150 Comments 0 Dmitry_Slepov is offline
Old

GPIO: Displaying currency exchange rate on 7-segment indicators

Posted 01-25-2017 at 06:13 AM by Dmitry_Slepov
Tags arm, linux, nodejs, tibbo

About the Application

This tutorial is dedicated to the control of 7-segment LED indicators by means of a single Tibbit #00_1 and several shift register ICs (daisy-chained together).
  • 7-segment indicators are reliable and cheap LED devices which can display decimal digits and some characters. Every segment of the indicator is monitored through an allocated input. To drive all these inputs from the LPTS, you need many wires (32 lines for a 4-digit display). A more pragmatic
...
LQ Newbie
Posted in Uncategorized
Views 110 Comments 0 Dmitry_Slepov is offline
Old

Fast random recursive slideshow script

Posted 01-24-2017 at 11:45 PM by the dsc (linux-related notes)
Tags slideshow

This is probably buggy and not well written, but it's faster than some other CLI image slideshow tools such as feh [citation needed], as it doesn't try to scan the whole folder tree for image files first, but it only has a directory list cache file (txt stored on $HOME, which may be a little bit slow to build for the first time, but not as much), picks one randomly, lists (ls) the image files into a cache file (txt on /dev/shm), and makes one randmoly into the wallpaper (if hsetroot is able to do...
Member
Posted in Uncategorized
Views 159 Comments 0 the dsc is offline
Old

NFS 16 Groups Limit Issue

Posted 01-23-2017 at 11:38 AM by loadedmind

This is basically a copy/paste of Kyle Anderson's blog posting. I'm merely creating a mirror here in the outside chance his content disappears in the future as his resolution was so informative and efficient. To read the entirety of his post, please click here

----Begin Paste----

Solving the NFS 16-Group Limit Problem
JUL 10TH, 2011
I apologize for the verbose post. This is a complicated problem and it merits full explanation. If you are experiencing...
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Posted in Uncategorized
Views 168 Comments 0 loadedmind is offline

  



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