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Arduino Radar Speed Sign – John McNelly

Arduino Radar Speed Sign – John McNelly | Raspberry Pi | Scoop.it
For Halloween 2020, I decided to build a replica of a radar speed sign using an Arduino and an HB100 doppler radar module. This writeup is gonna be a bit fuzzy, since as usual, I decided to document the project a tasteful 8+ months after it was complete. Have fun reading my semi-coherent image and schematic dump! How the Radar Do The project uses an HB100 doppler radar module and a pre-amplifier circuit in order to convert movement of objects in the HB100’s field of view into a square wave that gets fed into the Arduino Nano. Radar makes everything sound fancy, but in this case it’s no more complicated than what you would find in one of those supermarket automatic doors that triggers when some leaves blow by. The HB100 transmits a 10.525GHz carrier signal, which is reflected off of a moving target (in the case of this project, a person walking across a room at close range). The return signal from the moving target is doppler-shifted, and is thus a higher (or lower) frequency than the carrier, depending on whether the target is moving towards or away from the transmitter. By mixing the transmitted 10.525GHz signal with the reflected signal, the HB100 produces a signal that is the difference of the two frequencies. Fortunately, for objects moving at non-relativistic speeds, this difference frequency is usually very chewable for even the dumbest of microcontrollers, as it’s usually in the range of a few Hertz. In order to get the difference frequency into a format that can be processed by a microcontroller, the signal passes through a two-stage preamp circuit which amplifies it from a lil squiggle into a rail-to-rail square wave. The pre-amp circuit isn’t that interesting, and is ripped straight from the datasheet. There are some capacitors in parallel with the feedback path in order to generate some poles that roll off the frequency response around 72Hz, stopping the pre-amp circuit from amplifying high-frequency noise that is beyond the range of interest. Also note the chunky (4.7uF) AC coupling caps between stages. These coupling caps are yuge because they need to have a low impedance at the frequencies of interest (<100Hz). If we look at the 12k resistor used for the IF load, and assume that the HB100 IF circuit has a characteristic impedance in the range of 12kOhms, we can see that a 4.7uF capacitor provides an impedance lower than the characteristic impedance all the way down to around 2.8Hz. Neat! Once the preamp circuit was working, it was pretty simple to stick the output straight onto one of the Arduino Nano’s digital inputs. Input interrupts were used to time the pulses and estimate the frequency of the signal, which can be converted into velocity using the doppler radar equation. Bigass 7 Segment Display From the beginning, the real pizazz for this costume was always going to be the giant LED 7-segment display. I’d been wanting to make one for a long time, for no particular reason other than whee LEDs shiny, and more LEDs = more shiny. There have been plenty of 7-segment display implementations with all kinds of hardware, from the WS2812B chips controlling segments with individual addressing to cool multiplexing schemes. However, my favorite approach has always been the tried and true SPI shift register configuration. Using two SPI shift registers (the good ol’ 74HC595), each digit is controlled by a single shift register, with a single segment responding to a single bit output from each shift register. In the past, I’ve used the 8th bit output to control a decimal point, but that wasn’t necessary for this particular project. In order to make things easy and reasonably professional-looking, I designed a custom modular PCB containing 8 high-power amber LEDs. These hexagonal PCBs could interlock to form a 7-segment display digit, and contained the necessary current-limiting resistors, and switching transistors for turning the digit on and off. Solder pads at the interlocking edges of each PCB were used to share +12V and GND to the entire digit from any single powered segment. Additional solder pads on the edge of each segment connect to the gate of the switching MOSFETs, allowing a low-current enable signal from the shift register to control the segment of high-power LEDs. I should have added a series resistor to this gate network to protect the MOSFETs from ESD…in my late-night haste to assemble the costume, I managed to zap through the oxide layer on several MOSFETs with ESD, killing them. That caused a good amount of debugging headache! If I were to sell these segments or something, I would probably change the drive MOSFET to an NPN BJT with a gate resistor for added robustness. Putting Things Together! Links Github Repository Here’s a list of some of the parts that I used, in case people are looking! These are Amazon affiliate links (gotta make some of them Bezos Bucks).
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Raspberry Pi
A complete ARM GNU/Linux computer for $25.
(also covering Arduino and BeagleBone)
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Dear reader,

Dear reader, | Raspberry Pi | Scoop.it

The Raspberry Pi project website is http://www.raspberrypi.org/

This is one of my news digests. If you like my editorial choices, there are more to be found by clicking on the "dear reader" link, and on my name above.
Enjoy !

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this is 

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Propose de rechercher une ressource en tapant un mot clé dans le champ de recherche. Wuzea : http://www.wuzea.com
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Takeoff projects help students complete their academic projects. Register at takeoff projects today to find and learn about different interesting big data projects and grab the best jobs. Get started right now.
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Games: Humble Bundle and Proton | Tux Machines

Games: Humble Bundle and Proton | Tux Machines | Raspberry Pi | Scoop.it
Edatec’s compact, $113-and-up “CM4 Nano” industrial box is built around the RPi CM4 with HDMI, MIPI-DSI/CSI, GbE, WiFi/BT, 3x USB 3.0, 40-pin GPIO, a 12-18VDC input, and -25 to 60°C support. Edatech has launched a 103 x 62 x 21.5mm industrial system that runs Linux on a Raspberry Pi Compute Module 4. The company compares the box, which offers access to the CM4 Nano carrier board, with the Raspberry Pi 4 SBC. Touted advantages include a full-size HDMI port with USB-based touchscreen support, a wide-range 12-18VDC input, and an RTC. There is also a wider operating range, which is variably listed at -25 to 50°C and -25 to 60°C.
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Arduino IDE Creates Bootable X86 Floppy Disks

Arduino IDE Creates Bootable X86 Floppy Disks | Raspberry Pi | Scoop.it
Arguably the biggest advantage of the Arduino ecosystem is how easy it is to get your code running. Type a few lines into the IDE, hit the button, and in a few seconds you're seeing an LED blink or so...
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Projects - DIY Pi Buggy Australia

Projects - DIY Pi Buggy Australia | Raspberry Pi | Scoop.it
The motivation behind this project came from a robotics and engineering club that I've been going to. I've been saving my money and building up an understanding of raspberry pi and electronics. The reason I chose this project was to get used to using motors and controlling different speeds.
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SAE J1939 ECU Simulator Board For PC, Raspberry Pi, BeagleBone, Arduino, Teensy, Linux, Windows

SAE J1939 ECU Simulator Board For PC, Raspberry Pi, BeagleBone, Arduino, Teensy, Linux, Windows | Raspberry Pi | Scoop.it
SAE J1939 ECU Simulator Board For PC, Raspberry Pi, BeagleBone, Arduino, Teensy, Linux, Windows...
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Pro Mini Camera Mount for Raspberry Pi Zero–

Pro Mini Camera Mount for Raspberry Pi Zero– | Raspberry Pi | Scoop.it
This is the Pro model of our Mini Camera Mount, which includes a longer base section designed to hold your Raspberry Pi Zero! Raspberry Pi, Camera, cables and tripod not included!We designed this mount to create an affordable, tripod-compatible solution to help you monitor "things" with your Pi Zero...
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ESP32 Chat Application (Part 5)

ESP32 Chat Application (Part 5) | Raspberry Pi | Scoop.it
In part of of this series of tutorials, we will add the client connected and client disconnected events to our ESP32 chat application...
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A Raspberry Pi makes Apple CarPlay possible on a Tesla –

A Raspberry Pi makes Apple CarPlay possible on a Tesla – | Raspberry Pi | Scoop.it
Apple has been slowly entering the automotive field for the past few years. It first started with CarPlay, an iOS-based infotainment system that is available on some car models.It then released Ca…...
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Portable studio makes and plays music on 3

Portable studio makes and plays music on 3 | Raspberry Pi | Scoop.it
This Raspberry Pi-powered portable studio rig has everything you need to create complete tracks and also play them live.
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The 2021 Arduino Open Source Report is out

The 2021 Arduino Open Source Report is out | Raspberry Pi | Scoop.it
We're excited to announce that the Arduino Open Source Report for 2021 is now available to download.
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Analyzing The Pros and Cons of Python Web Development

Analyzing The Pros and Cons of Python Web Development | Raspberry Pi | Scoop.it
Python is one of the emerging technologies to have come in recent times. This blog exhibit the Pros and Cons of Python Web Development in a subtle manner.
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The Festival Of Urgent Reinventions: How Will You Change The World? - Make:

The Festival Of Urgent Reinventions: How Will You Change The World? - Make: | Raspberry Pi | Scoop.it
How will you change the world?The Festival Of Urgent Reinventions is a free 2-day event on February 3rd & 4th, 2022 to question and reimagine how we...
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Adafruit Learning System

Adafruit Learning System | Raspberry Pi | Scoop.it
Search Search Search using the text box in the upper right, or check out our new guides... Adafruit ESP32-S2 TFT Feather 3 Beginner Adafruit QT Py ESP32-S2 6 Beginner Adafruit ESP32-S2 Feather 10 Beginner Adafruit FunHouse 27 Beginner Cooperative Multitasking in CircuitPython with asyncio 26 Advanced CircuitPython on Raspberry Pi (Bare Metal / No OS) 2 Intermediate Your browser does not support the video tag. This links to the guide Four Channel Audio Passive Stereo Mixer. Four Channel Audio Passive Stereo Mixer Beginner MagTag James Webb Telescope Status 1 Beginner Capturing Camera Images with CircuitPython 6 Beginner PyPortal WFH Busy Sounds Simulator 2 Beginner Navi10 MacroPad with KB2040 and KMK CircuitPython... 1 Beginner Introducing Adafruit Feather RP2040 44 Beginner QT Py Snap Fit Case 3 Beginner Quickstart: Adafruit IO WipperSnapper 23 Beginner Your browser does not support the video tag. This links to the guide Adafruit Hallowing M4. Adafruit Hallowing M4 13 Beginner PyLeap EyeLights LED Glasses Rainbows for Circuit... Beginner PyLeap Blink Animation 1 Beginner AdaBox 020 24 Beginner Decorative Pointy Elf Ear Bud Holders 2 Beginner LED Sculpture Lamp 3 Beginner Your browser does not support the video tag. This links to the guide Adafruit NeoSlider. Adafruit NeoSlider 4 Beginner Adafruit KB2040 6 Beginner DIY Trinkey No-Soldering USB Air Quality Monitor 3 Beginner BLE Sniffer with nRF52840 2 Intermediate 1 2 3 4 Next Last 78 tutorials in group
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Matrix-Inspired Digital Rain Project Packs a 127-Frame Animated GIF Onto a Raspberry Pi Pico's Flash

Matrix-Inspired Digital Rain Project Packs a 127-Frame Animated GIF Onto a Raspberry Pi Pico's Flash | Raspberry Pi | Scoop.it
Designed for complete authenticity, this Matrix-style animated gadget squeezes a 135x240 127-frame animated GIF into just 2MB.
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ESP8266 for absolute beginner - Arduino alternative 2022 - IT & Software

ESP8266 for absolute beginner - Arduino alternative 2022 - IT & Software | Raspberry Pi | Scoop.it
ESP8266 for absolute beginner - Arduino alternative 2022 in Hardware, IT & Software...
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How to Seamlessly Switch to Linux from Windows | Tux Machines

How to Seamlessly Switch to Linux from Windows | Tux Machines | Raspberry Pi | Scoop.it
A few days ago, I decided to tinker with an old Acer Aspire laptop in an attempt to make it useful again. It was running a previous version of Xubuntu, a lightweight Linux distribution, but nobody wantsed to use it because it was too damn slow. I could just imagine how it fares with Windows on it. I remember the time before I got my hands on those Linux installation diskettes, when I get frustrated with the way Windows crashes my desktop PC, and it was not a pleasant experience. This Acer Aspire, whilst it does not crash, it is too damn slow. Heck, my Raspberry Pi 4 is even faster! (Maybe because it is running Intel chips! Haha) Anyway, I decided to get an internal SSD drive to replace this uber-slow HDD. A 480GB Kingston SSD to replace a 500GB HDD is not much of a trade-off considering that it is not intended to be the main workstation (we have Macs for those). All it took was opening the bottom cover and replacing the HDD (I found out that there is still an empty memory slot, so that is the next upgrade, I guess). Next step was to decide which Linux distribution to install. I have read good reviews of Pop!_OS, Elementary OS and Zorin OS, and, of course, Ubuntu is still on my short list. Heck, I even thought of using the PC desktop version of Raspberry Pi OS! So I did download the installers for these distributions, with the exception of Elementary OS, which was taking too long to download, even on my 300Mbps connection!
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Databot 2.0 Multi-Sensor STEM Kit with App & Arduino Support -

Databot 2.0 Multi-Sensor STEM Kit with App & Arduino Support - | Raspberry Pi | Scoop.it
Meet the Databot 2.0: an app connected STEM kit that introduces students to science and coding concepts.It comes with 17 different sensors, including UV,...
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[100%OFF] The Art of Doing: Electronics for Everyone

[100%OFF] The Art of Doing: Electronics for Everyone | Raspberry Pi | Scoop.it
Udemy Coupon Code For The Art of Doing: Electronics for Everyone, Find Out Other Highest rated and Bestselling Hardware Courses with Discount Coupon Codes.
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Sezme: a Memory Game for the Arduino

Sezme: a Memory Game for the Arduino | Raspberry Pi | Scoop.it
  I have just started using the Arduino and I thought I would try my hand at a little project of my own. Sezme is a game for the Arduino Uno that tests your memory. It is easy to build as I have only used LEDs, resistors, switches and a Piezo.
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Raspberry Pi Picoを使った自作テンキーキット「Shotgun チェリーパイ」が入荷(Impress Watch)

Raspberry Pi Picoを使った自作テンキーキット「Shotgun チェリーパイ」が入荷(Impress Watch) | Raspberry Pi | Scoop.it
 Raspberry Pi Picoで組み立てるテンキーキット「Shotgun チェリーパイ」が遊舎工房に入荷した。Raspberry Pi Picoやキースイッチ・キャップなどは別売り。店頭価格は...
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Best ZigBee temperature sensors

Best ZigBee temperature sensors | Raspberry Pi | Scoop.it
What's the best ZigBee temperature sensor money can buy?Let's test all of them and find out...
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Raspberry pi for beginners

The Raspberry Pi is a pretty cool little computer - however unlike normal personal computers it does not come preloaded with an operating system (OS).This mea…...
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NEW GUIDE: PyPortal WFH Busy Sounds Simulator #AdafruitLearningSystem #CircuitPython #PyPortal #WFH « Adafruit Industries – Makers, hackers, artists, designers and engineers!

NEW GUIDE: PyPortal WFH Busy Sounds Simulator #AdafruitLearningSystem #CircuitPython #PyPortal #WFH « Adafruit Industries – Makers, hackers, artists, designers and engineers! | Raspberry Pi | Scoop.it
A new guide in the Adafruit Learning System: PyPortal WFH Busy Sounds Simulator by Tim C. Use an Adafruit PyPortal to play various notification sounds on a loop.Folks will think you are mighty bus…...
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Face Tracking Ping Pong Launcher With Arduino And Rpi

Face Tracking Ping Pong Launcher With Arduino And Rpi | Raspberry Pi | Scoop.it
Protect your desk with this ping pong ball launcher that detects and aims at an intruder&#39;s face before firing a barrage of ping pong balls at them.
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Raspberry Pi E-Ink display HAT from £12

Raspberry Pi E-Ink display HAT from £12 | Raspberry Pi | Scoop.it
Raspberry Pi enthusiasts searching for a low-power E-Ink display for their next project should check out the Raspberry Pi HAT E-Ink display...
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