Blake Bourque TechplexEngineer

If you are getting an error similar to this:

Pango-WARNING **: failed to create cairo scaled font, expect ugly output. the offending font is 'Arial Bold 19.53125' at /usr/lib64/perl5/vendor_perl/dpm/canvas_module.pm line 253.
Pango-WARNING **: font_face status is: out of memory at /usr/lib64/perl5/vendor_perl/dpm/canvas_module.pm line 253.
Pango-WARNING **: scaled_font status is: out of memory at /usr/lib64/perl5/vendor_perl/dpm/canvas_module.pm line 253.
Pango-WARNING **: shaping failure, expect ugly output. shape-engine='BasicEngineFc', font='Arial Bold 19.53125', text=' 3R ' at /usr/lib64/perl5/vendor_perl/dpm/canvas_module.pm line 253.

The fix:
$ cd /usr/share

Field Name	Value
DDNS Service	Custom
Do not use external ip check	No
DYNDNS Server	dynamicdns.park-your-domain.com
User Name	username (is not used)
Password	<alphanumeric string from Namecheaps Dynamic DNS page>
Host Name	<specify the subdomain. For example given test.example.com just specify test. To use DDNS on the naked domain specify @. Multiple entries can be separated by adding a -a >
URL	/update?domain=<example.com>&password=<same as the above password>
Additional DDNS Options	\

Note to the reader: Code blocks beginning with a $ are commands to be run on a RPI Rasbian shell.

Enable I2C support
1. add i2c-dev to the end of /etc/modules
2. comment out (with a #) the line that says blacklist i2c-bcm2708 in /etc/modprobe.d/raspi-blacklist.conf
Enable the current user to access I2C hardware
1. install i2c-tools (includes i2cdetect and adds the i2c group) with: $ sudo apt-get update && sudo apt-get install i2c-tools
2. add the current user to the i2c group with: $ sudo adduser <USER> i2c where <USER> is the username to add to the i2c group
Get the chip-address on the bus of a connected device
1. $ i2cdetect -y i2cbus Where:

Setting up your Pi for CGI

lines starting with a $ indicate a command to run

Make sure you have I2C setup on your PI
$ sudo apt-get install lighttpd # install a web server
$ sudo usermod -aG i2c www-data # add the cgi user to the i2c group
$ mkdir -p /var/www/cgi-bin # create the cgi-bin folder

Install
- Vim sudo apt-get install vim
- Git sudo apt-get install git
- Sublime
- Nodejs
- Dropbox
- Copy
- Wine
  - Microcap
Generate SSH Key

	/*!
	* @file
	*
	* @brief Library for the TC47A* I2C temperature sensors
	*
	* @author Blake Bourque
	*
	* @date Mar 5, 2014
	*
	* Provides readTempInC and readTempInF

	SUBSYSTEM!="usb_device", ACTION!="add", GOTO="avrisp_end"

	# Atmel Corp. JTAG ICE mkII
	ATTR{idVendor}=="03eb", ATTR{idProduct}=="2103", MODE="660", GROUP="dialout"
	# Atmel Corp. AVRISP mkII
	ATTR{idVendor}=="03eb", ATTR{idProduct}=="2104", MODE="660", GROUP="dialout"
	# Atmel Corp. Dragon
	ATTR{idVendor}=="03eb", ATTR{idProduct}=="2107", MODE="660", GROUP="dialout"

	LABEL="avrisp_end"

	CC=avr-gcc
	CFLAGS=-g -Os -Wall -mcall-prologues -mmcu=atmega88
	OBJ2HEX=avr-objcopy
	#UISP=/usr/local/bin/uisp
	TARGET=main
	#ADFLAGS=-p m8 -c FT232 -P /dev/tty.usbserial-A8003POq
	ADFLAGS=-p m88 -c avrispmkII -P usb

	# .PHONY means that these are not a target
	.PHONY: fuses prog erase

	#include <avr/io.h>
	#include <avr/interrupt.h>
	#define F_CPU 1000000UL //processor frequency 1MHz
	#include <util/delay.h>

	#include <stdbool.h>

	#define output_low(port,pin) port &= ~(1<<pin)
	#define output_high(port,pin) port \|= (1<<pin)
	#define set_input(portdir,pin) portdir &= ~(1<<pin)