In this episode Shahriar explores the functionality of the popular ESP8266 SoC chip. This IC incorporates a full ISM radio as well as the physical/MAC layer for 802.11b/g/n network communication. Furthermore it includes a uC core for code execution making it a low-cost candidate for Internet of Thing applications. This video uses a Sparkfun Thing evaluation board which also includes a LiPo batter charger, voltage regular, flash memory and all the I/O pins which are accessible to the user. The block diagram of the ESP8266 is reviewed as well as the schematic of the complete Sparkfun Thing board.
By using an Arduino library and the Blynk iOS application, a cell phone and the ESP8266 can simultaneously communicate with a server running the Blynk application and transfer data between the application and the module. In this demo various components such as NeoPixel (WS2812), OneWire temperature sensor and battery monitoring functionality are implemented. The code is available here.
In this episode Shahriar and Timo demonstrate the design methodology of an FPGA based 32×32 RGB LED matrix driver. Timo has kindly devoted some of his time to describe the block diagram and the thought process which goes into designing this type of FPGA display driver. The various components of the overall system (PLL, UART, and Display Controller) are shown along with the simulation data. The outputs of the Spartan-6 FPGA board are then measured using a Keysight S-Series oscilloscope. The design of the RGB matrix is also demonstrated using a custom clock interface sent wirelessly to the unit via Bluetooth. All the FPGA design files can be downloaded here.
In this episode Shahriar builds a magical charger circuit that has an efficiency of tens-of-thousands of percent! But not to worry, it is a trick and the trick is revealed in the video. The purpose of the video is to discuss the nature of the scientific method and our society’s need for free education.
I had a great time as a guest of The Amp Hour. We talked about everything from device physics to circuit design into the mm-wave frequencies and beyond. Although this interview took place a short while ago, I thought it would be beneficial to also have a link here at The Signal Path. Also, don’t forget to listen to the many great episodes of The Amp Hour. The link to my interview can be found here.
In this episode Shahriar demos various microwave and mm-wave connectors, components and modules. The purpose of this video is to help new engineers become familiarized with microwave components and help reduce the chance of component damage and failure.
This video demonstrates microwave connectors (BNC, SMA, 3.5mm, 2.92mm (K), 2.4mm, 1.85mm (V), 1.0mm), interfacing instructions, attenuators, power splitters (both resistive and reactive), phase shifters, mm-wave cables, AC coupling caps, Bias-Ts and their principle of operation, mixers, tuning stubs, couplers, switched attenuators, microwave filters, multipliers, amplifiers, coaxial to waveguide converters, waveguide components including horn antennas, and directional couplers. The video also demonstrates Cascade GSG probes and GGB custom composite RF probes. The documents for this video can be downloaded from here.
The Signal Path (TSP) is an electrical engineering video blog for industry professionals, students and hobbyists. TSP is a non-for-profit website dedicated to provide free education spanning a wide range of electrical engineering topics. Equipment reviews, tutorials and repair videos are posted regularly.