Archie500 has posted instructions about how he built a Raspberry Pi-based monitor for his internet bandwidth into and out of his house.
Raspberry Pi monitors internet bandwidth
This is a bandwidth monitor using a Raspberry Pi and an OLED display to graphically show the internet bandwidth into and out of our house.
A video showing it working is above.
Sometimes if the internet is slow or not working very well it can be hard to tell if it’s because three other people are watching YouTube videos of if there’s some other problem with the internet connection. By checking the bandwidth monitor you can see straight away the data rate into and out of the house and work out if the problem is with your internet connection or just too many people watching Mat and Pat on YouTube.
In a very brief summary it works as follows: The Raspberry Pi uses SNMP (Simple Network Management Protocol) to get the WAN data rates from the router and then displays these graphically on the OLED screen.
The Raspberry Pi was already set up as our media player and is next to the television. The OLED display was inexpensive and can be bought from a number of places including eBay.
Ever wonder how does a crystal oscillator work? Check this 41-min video from Craig on the operational theory of crystal oscillators, and designing a discrete Pierce crystal oscillator suitable for use as a local oscillator in an HF receiver.
In his 2-part Youtube videos (Part 1 and Part 2), Scullcom describes in detail how to build a basic function generator with frequency up to 30KHz using XR2206 chip. He uses an Arduino Nano for controlling and display purpose. The output frequency is displayed on seven segment LEDs.
Jean-François Duval’s entry to 2015 Hackaday Prize is FlexSEA, a wearable robotics toolkit.
FlexSEA wearable robotics toolkit
The human body is an incredibly efficient machine, the result of millions of years of optimization via evolution and natural selection. Improving on that is hard, really hard, but sometimes, we have no choice but to replace biological limbs with artificial ones. Every year, 185,000 Americans get an amputation and the large majority of them will end up in a wheelchair, or with a passive or quasi-passive artificial limb that is only slightly better than a peg leg.
Can’t we do better? What about that revolutionary design that you saw in the news? Truth is, we are now able to design powered prosthetic limbs that will truly change people’s lives. Sadly, a very small subset of the successful research projects will reach the market. The commercialized products will often have a price tag comparable to a mid-sized car, not something that everyone can afford (especially if you need one per leg!)
Back in the 80s when I was a kid, My parents bought me a Game and Watch game called Vermin. It was actually a TimeOut Exterminator. It was a really simple game with just left and right controls and the idea was to hit moles that were emerging from the ground. The screen consisted of pre drawn monochrome lcd images that were turned on and off when they were needed to be displayed. I loved that game and played it for many years. My parents still had it many years later and I ended up selling it on eBay and got quite a lot for it.
A few months back I was listening to one of my favourite podcasts “Retro Gaming Roundup” which featured the Top 10 Game & Watch games. This re-ignited my interest for the Game & Watch series and so I decided to build one of my own only mine would feature a graphic LCD and allow me to emulate multiple Game & Watch games and even write new ones. Source code and Schematics can be found in the final step.