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This is the third instalment in a series of blogs post to support a RoadTest Review of the ACCESS:bit for micro:bit . The review is being conducted by a student from a high school computer club. Details can be found here RoadTest Support: ACCESS:bit for micro:bit The Application   This blog post picks up from where the unboxing blog post RoadTest Support: ACCESS:bit for micro:bit Introduction (Research and Unboxing)  left off. After some discussion with the club coach on next steps, I ...
I've been posting about the UltraZed-EV roadtest and realized that I should have provided an overview first to put my posts in context.   I've wanted to design a home security/video surveillance system for a while.  I have a mix of different IP cameras that I use for monitoring and an NVR that I use for recording.  I prefer not to have a Cloud based system because of poor wan reliability, high latency, unknown data security, and high subscription cost.  I also have a conglom ...
In my previous post Avnet UltraZed-EV Starter Kit Road Test - Port PYNQv2.5 , I had ported PYNQv2.5 to the UltraZed-EV using the PetaLinux BSP (uz7ev_evcc_2019_1.bsp) which is for the OOB design.  This verifies the porting process works but now I need to integrate the VCU which is not in the OOB design.   The hardware design bitfile is is loaded as an overlay in PYNQ but any drivers and software need to be installed separately.  Since PYNQ uses an Ubuntu rootfs and I am using a p ...
Mario Bergeron recently did a tutorial project on Hackster.io vitis-ai-1-1-flow-for-avnet-vitis-platforms  that "provides detailed instructions for targeting the DNNDK samples from the Xilinx Vitis-AI 1.1 flow for Avnet Vitis 2019.2 platforms."   The UltraZed-EV is one of the supported platforms.  I need an AI component for my roadtest project so this was a very timely tutorial.  I decided that since he provided pre-built images that I would do a quick run through of the ...
3.5 Capacitor Characterization  An ideal capacitor can be specified by a single value: its capacitance. Here I will show how I measured 2 capacitor non-idealities: the dielectric absorption and the dielectric leakage.  Dielectric absorption is an effect caused by the "alignment" and the "dealignment" of the molecular dipoles of the capacitor dielectric caused by the application of an electric field. While dielectric leakage is the current that crosses the capacitor dielectric and slow ...
As indicated in the Introduction post RoadTest Support: ACCESS:bit for micro:bit Introduction (Research and Unboxing) this RoadTest Review is intended to be a collaboration effort. The RoadTest review posting ACCESS:bit for micro:bit suggested this RoadTest would be good for a parent and child team. I'm not interested in having any more kids! My thought, maybe the RoadTest would be a good project for one of the Computer Club Students.   I have the role as Coach, in an after hour Computer C ...
This is a blog post in support of a RoadTest Review for ACCESS:bit for micro:bit . I established a format of a documenting my RoadTest process through a series of blog post. The  RoadTest Review itself, is a summary of findings that refers back to the blog posts.That same format will be used for this RoadTest.   This RoadTest is a collaboration effort between a 16 year old high school student, who is a member of an after hours high school Computer Club, and the coach that supports the ...
I've been using PYNQ on the PYNQ-Z2 and Ultra96v2 boards and I thought that it could prove useful for evaluating and prototyping with the UZ7EV.  Unfortunately there isn't a prebuilt PYNQ image for this board yet.  The good news is that Peter Ogden of Xilinx made a couple of posts that document how to get PYNQ working with unsupported boards.   There are two approaches described: Port PYNQ using a board agnostic rootfs image combined with the correct BSP for your board: quick-po ...
July 4, 2020 I had hoped to finish the VCU TRD design tests this week and move on to taking a closer look at the design and using the design tools to tweak it to verify that I have a good tool setup. Unfortunately, even the simplest things sometimes turn out to be difficult and I have a couple of problems that I haven't resolved yet.   July 17, 2020 Well, here I am two weeks later.  Some personal difficulties and other problems that I had not anticipated.  But I guess relative ...
3.4 LEDs 3.4.1 Steady state LED I-V curve variability 3.4.2 LED step-stress and I-V characterization     3.4 LEDs  Diodes are two-terminal electronic devices that facilitate current conduction in one direction and block it in the opposite direction. Their electrical characteristics can be described by the Shockley diode equation which defines the relationship between current and voltage across a diode:     Where: I is the diode current. Is is the reverse bia ...
Getting started with the STM32H7B3I-DK Posted to support the STM32H7B3I-DK -  DISCOVERY KIT roadtest.   The following items are recommended by ST to explore and test the various features of the STM32H7B3I-DK: Java 8.241 STM32CubeIDE 1.3.0 STM32CubeMX 5.6.0 STM32CubeProgrammer 2.4.0 TouchGFX Designer 4.13.0 STM32Cube_FW_H7_V1.7.0 X-CUBE-TOUCHGFX   TouchGFX Designer It is a user friendly software to facilitate creating graphics, especially for touchscreen displays. It ...
A few days ago I received the Genesys ZU board to work with it and submit a RoadTest. This opportunity came right on time for me, as I have been particularly interested in Hardware Acceleration (Hardware Design for Multi-Modal Data Acquisition and Processing) and I was checking to purchase a platform in order to begin investigating, apply models, provide results, etc, exactly the same way you do when working with GPU based hardware acceleration but, implementing it on an FPGA instead. Therefore, ...
3.3 DC-DC converter efficiency measurement   The use of DC-DC converters has become almost universal in modern electronics. One important factor that needs to be evaluated, especially when the power comes from a battery, is the DC-DC converter efficiency.   I decided to evaluate a MAX 17503 step-down DC-DC converter evaluation board efficiency at an 8 Ω load. The SMU was connected to the DC input of the converter, and a the Keithley DMM6500 to the output. By dividing the output ...
3.2 Battery Characterization   Battery selection for a specific application can depend on multiple factors: price, size, weight, safety and its electrical properties. Manufacturers are known for making dubious claims about their batteries lifetime and capacity, so the proper way to evaluate a battery is to characterize it.   Batteries are complex electrochemical devices that do not behave as constant voltage sources (Figure A). Their terminal voltage depends on the amount of charge in ...
3.1 Solar cell characterization (worflow comparison) 3.1.1 Front panel 3.1.2 Web remote control 3.1.3 KickStart 3.1.4 I-V tracer app 3.1.5 Remote control 3.1.6 Standalone script     3.1 Solar cell characterization (worflow comparison)  Solar or photovoltaic cells are devices that convert light energy directly into electricity. The shape of the solar cell I-V curve makes the maximization of the output power an important goal to maximize the efficiency of ...
Introduction:The goal of this blog post is to document my experience with the Omega PCC-SMD connector Looking for 5 People to Experiment with Thermocouple/RTD Connectors .  The exercise was to provide feedback on Omega PCC-SMD-20 connector. This commentary is not a RoadTest Review in the formal sense. I labelled it a RoadTest Lite, meaning I applied the same same diligence required for a RoadTest except the application process was informal.   Review:Documentation for the connector is a ...

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