This software was developed to help the visually impaired to see who is calling on the landline. A possible setup would be using a Raspberry Pi and an USB modem.

The main part of the program only shows the last 4 callers and if being called the current caller. Everything is setup as big as possible on a fixed 1024x768 resolution with high contrast. The only input used is the scroll-wheel to mark the last called numbers as seen.

INSTALLATION The program runs on node.js supported by some libraries.

Install node.js wget http://node-arm.herokuapp.com/node_latest_armhf.deb sudo dpkg -i node_latest_armhf.deb

Istall express npm install express

Install serialport npm install serialport

Install nedb npm install nedb --save

SOFTWARE Node.js https://nodejs.org/en/ Express http://expressjs.com/ Node-serialport https://github.com/voodootikigod/node-serialport Nedb https://github.com/louischatriot/nedb

Usefull links for installing on Raspberry Pi

Resolution: http://weblogs.asp.net/bleroy/getting-your-raspberry-pi-to-output-the-right-resolution http://www.webtechgadgetry.com/2013/12/make-raspberry-pi-use-full-resolution-monitor/

Disable log: http://linuxonflash.blogspot.nl/2015/02/optimizing-performance-on-raspberry-pi.html

Kiosk mode: https://www.danpurdy.co.uk/web-development/raspberry-pi-kiosk-screen-tutorial/

HDMI turnoff with screensaver http://simonmcc.blogspot.nl/2013/09/raspberry-pi-turn-off-hdmi-after.html

tvservice --explicit="DMT 16" fbset -depth 8 fbset -depth 16 xrefresh -d :0.0

Make sure chmod 755 on files in rc.local: su pi -c '/home/pi/screensaver/check_screen_state.pl < /dev/null &'