CallerPi

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

Install express

npm install express

Install serialport

npm install serialport

Install nedb

npm install nedb --save

Software

• Node.js
• Express
• Node-serialport
• Nedb

Useful 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 &'