AMP Cache Update Script
I recently read up on the AMP Project and installed the plugin to enable AMP-compatible pages for my blog. A couple weeks later I realized the code snippets in some of my blog posts were formatted incorrectly. I fixed the […]
micro:bit Compass
The other day I bought a micro:bit for my daughter. It’s a small computer with bluetooth, an accelerometer, light sensor, magnetometer and temperature sensor. It also has a couple of buttons for input and a matrix of LEDs for output. […]
Running Python CGI Scripts on the Raspberry Pi
Python is the language of choice for controlling the Raspberry Pi’s GPIO pins. It seems only natural then that to interact with your Pi over the web it should run a web server able to handle Python CGI scripts. Following the steps below […]
Controlling the MCP4151 Digital Potentiometer with the Raspberry Pi
We’re going to use the Raspberry Pi’s SPI bus to control Microchip’s MCP4151 8-bit digital potentiometer. The MCP4151 is an 8 pin SPI device that can be used to programmatically control output voltage. The GPIO pins on the pi run at 3.3 […]
Controlling an SPI device with the Raspberry Pi
The Raspberry Pi has a Broadcom BCM 2835 chip allowing it to interface with SPI devices on its GPIO pins. There are two chip select pins meaning that the Pi can control two devices simultaneously. P1 Header Pin Function 19 […]
Manual WordPress Upgrade – The Easy Way
I choose to not run FTP on my server so when it comes time to upgrade WordPress, I do it manually. If, like me, you think that even the short instructions are too long, here are the even shorter instructions. […]
Automating Rsync Backups to Amazon EC2
A while back I wrote about how to perform incremental backups via rsync to an Amazon EC2 instance. The script worked great when run manually from a Python interpreter but I always ran into issues when trying to automate the […]
Backup to AWS EBS via Rsync and Boto 3
Update 11/2015: Updated the script to use boto3 and waiters Switched to use the t2.micro instance type with VPC More detailed setup instructions Overview Amazon Web Services Elastic Block Storage provides cheap, reliable storage—perfect for backups. The idea is to temporarily […]
VelocityEmail – Easy E-mail for Java using Templates
A common requirement for a Java web application is that it be able to send e-mail in response to certain events. A couple simple examples of this requirement are a web form that sends a confirmation e-mail to the user […]
Recaptcha for phpBB3
Over the last year, I have had significant issues with spam on the phpBB3 forums that I administer. The recent blog post over at the phpBB site confirmed two things I already suspected: first that I am not alone in […]