In this episode, Shahriar investigates the theory and experimental results of the impact of extreme low temperatures on passive and active components. Liquid Nitrogen in used in a transparent glass Dewar where different components can be fully submerged in the liquid. Various types of resistors are compared for their temperature stability. An electromagnet which uses Copper coils is used to generate a magnetic field at a constant power consumption at both extreme temperatures. The impact of liquid nitrogen on the junction voltage of an NPN device is measured as well as the frequency shift of a CMOS ring oscillator. Finally, the wavelength shift of an LED submerged in liquid nitrogen is studied. There is a puzzle at the end of this video, please share your thoughts in the comments section. All documents can be downloaded from here.
In this (experimental) episode Shahriar demonstrates two embedded-electronic circuits available for purchase from Sparkfun Electronics. The demos illustrate some of the capabilities of these circuits along with a short instruction on how to interface and operate them. All the code for the AHRS demo and the RGB Matrix demo are available to download.
The first demo is of a 9-degree of freedom (9-DoF) sensor board equipped with three dimension of linear acceleration (accelerometer), angular acceleration (gyroscope) and magnetometer. Using the combined information from these sensors an Attitude and Heading Reference System (AHRS) data can be extracted. The demo shows this system in action using customized Matlab functions.
The second demo demonstrates the ease of use of an RGB LED Matrix equipped with an SPI interface. A sample C code written for a Microchip PIC18F2455 is used to draw some simple animations.
This is an experimental episode to judge the level of interest in these type of demo videos. Please leave feedback!
In this episode Shahriar takes a look inside the “Logic”, “Logic16″ and USBee SX which were reviewed in the previous episode. The PCBs get a closeup inspection along with some insight into the design of these products. How do they compare? Well, you’ll have to watch the video to find out! Make sure to comment and join our Community Forum to discuss these products.
As our first episode Shahriar will review two products from Saleae: “Logic” and the brand new “Logic16″. The video review also features USBee SX which is a direct competitor to Logic. Logic ($149) and Logic16 ($299) can be purchased directly from Saleae’s website or from one of their distributors.
Make sure you watch the next episode where we take these units apart to see what makes them tick!
This is "The Signal Path dot com"! An electrical engineering video blog for students, hobbyists and hackers. I do equipment reviews, teardowns, circuit design tutorials, testing procedures and more! Subscribe to my RSS, join the community forum and participate in the discussions.