Archive for May, 2015

Adding a Raspberry Pi Camera to Elf the Robot

Sunday, May 31st, 2015

Robots are a lot of fun.

Robots that stream video over WiFi are even more fun!

Elf Raspberry Pi Robot @

(click on image for larger version)

Today I’ve updated my Elf Raspberry Pi based robot’s build log with instructions on:

  • adding a Raspberry Pi Camera
  • adding MJPG-Streamer so Elf streams what he sees over WiFi
  • adding a ramdisk for MJPG-Streamer so it won’t wear out the SD card

I hope you enjoy the Elf blog, and please feel free to ask any questions!

Elf Article Index

Raspberry Pi IoT Experiment #1: LDR & ThingSpeak

Sunday, May 17th, 2015

Raspberry Pi & IoT – a perfect match!

Raspberry Pi IoT Experiment #1

(click on image for larger version)

This article is about logging illumination levels to an IoT service using some inexpensive Light Dependent Resistors.

I tested three LDR’s with different pull down resistors at the same time to see which would give the best results with low and high lighting levels, and posted the Python code for logging to the ThingSpeak IoT service. Plenty of charts for you :)

Raspberry Pi IoT Experiment #1: LDR and ThingSpeak HowTo

Article Index

  1. Introduction, Free IoT logging & visualization
  2. LDR (Light Dependent Resistors) tracking illumination levels in my lab
  3. LDR tracking sunset & more!

Related Articles

Raspberry Pi Model B+ price reduced to $25USD

Thursday, May 14th, 2015

In a surprise announcement, Eben Upton announced a price cut on the Raspberry Pi Model B+

Raspberry Pi B+ @Mikronauts

(click on image for larger version)

Apparently the Raspberry Pi Model B+ has continued to sell well despite the introduction of the quad core Raspberry Pi 2 Model B, and due to the production optimizations made for the Raspberry Pi 2, it was now feasible for the Raspberry Pi Foundation to drop the price of the Model B+.

The 40 pin GPIO Pi’s now sell for:

  • $20 Raspberry Pi Model A+
  • $25 Rasoberry Pi Model B+
  • $35 Raspberry Pi 2 Model B

Related Links:


HannStar 10.1″ TFT LCD & HDMI Adapter Review with Raspberry Pi 2

Sunday, May 10th, 2015

I need some displays for my projects that don’t use GPIO’s or the SPI port, so I’ve been evaluating some LCD displays for my Pi projects – and I thought y’all might be interested in my findings!

RPi2 + 10.1" TFT Review @

(click on image for larger version)

Article Index

Other recent LCD reviews: