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1750Hz tone generator using 74HC4060

Posted on by mixos

Dilshan Jayakody published a new mini circuit. He writes:

The 1750Hz tone bursts are often used to trigger repeaters. There are several methods to build 1750Hz tone generators which including TC5082 divider, using MCUs, etc.
In this post, I present another 1750Hz tone generator which I built using 74HC4060 high-speed 14-stage binary ripple counter and 7.168MHz crystal. In this design, 74HC4060 is used to drive the crystal and divide its output by 4096. By using 7.168MHz crystal, this circuit produces 1750.0Hz square wave output with a 50% duty cycle.

1750Hz tone generator using 74HC4060 – [Link]

Tektronix 3 Series MDO and 4 Series MSO Oscilloscopes

Posted on by mixos

Two oscilloscopes launched by Tektronix on June 4 are now in stock at Farnell. After intensive research amongst users Tektronix developed the new 3 Series MDO and 4 Series MSO. The oscilloscopes are built upon the user experience introduced in the 5 and 6 series MSOs.

They both feature a highly intuitive touchscreen user interface incorporating the touch interactions familiar from phones and tablets, the largest and highest resolution display in their class and modern industrial design.

Typical applications including embedded design and IoT, Power design, Education, Manufacturing Test and Troubleshooting and Service Installation and Maintenance.

The 3 Series MDO is intended to be a compact, versatile test instrument that can sit on the desk of every engineer, taking up just six inches of depth on the bench whilst delivering an intuitive user interface and similar set of knobs and buttons to other models.

The instrument features an 11.6in. display with 1920 x 1080 HD resolution capacitive touch display, bandwidth ranging from 100MHz to 1GHz and an option to add spectrum analyser hardware at 1GHz or 3GHz; arbitrary function generator, digital channels and Serial Bus Decode, Triggering and Search.

It also offers a DVM/frequency counter added at no cost following product registration and it is future proofed with fully upgradable bandwidths and options.

The 4 Series MSO has been built to meet a diverse range of application requirements alongside enhanced user experience.

Features include a 13.3in. (1920 x 1080 HD resolution) capacitive touch display which has a stacked display mode automatically adding and removing additional horizontal waveform ‘slices’ (additional graticules) as waveforms are created and removed, reducing tradeoffs between accuracy and visibility.

Bandwidths range from 200MHz to 1.5GHz. Vertical resolution is enabled through 12-bit ADCs providing 16 times the vertical resolution of traditional 8-bit ADCs, enabling users to capture the signals of interest while minimising the effects of unwanted noise.

The instrument offers six input channels avoiding the introduction of a second scope for complex applications such as embedded systems or power supply design and includes FlexChannel technology enabling any input channel to be converted from an analog to eight digital channels simply by connecting a logic probe.

An eight-digit trigger frequency counter is added at no cost following product registration

Bandwidth and options are all field upgradeable.

The Tektronix 3 Series MDO and 4 Series MSO are available from Farnell in EMEA, Newark in North America and element14 in APAC for €3,570 – €4,260

For more models of the NEW 3 Series MDO and 4 Series MSO check on www.tek.com

A catalog of 125 Linux hacker boards from linuxgizmos.com

Posted on by mixos

linuxgizmos.com 2019 spring edition catalog of hacker-friendly SBCs under $200 that run Linux or Android offers updated descriptions, specs, and pricing for 125 SBCs and is published yesterday. The fellow website sets two big questions for 2019: Is it time for AI, and what about those tariffs?

This is the latest catalog of 125 community-backed Linux and Android SBCs compiled from linuxgizmos.com. They have compiled the essential prices, features, and comparisons to help you vote based on various aspects. They have updated the blurbs and the comparison spreadsheet with new pricing and in some cases, feature changes, and added descriptions of new boards.

Catalog listing

The selection criteria are the same as last year, with a limit of 15 boards per vendor. (We’ve combined some of the similar Orange Pi and NanoPi boards to fit under this limit.) There is also a similar, loosely defined requirement to check off most of our open source boxes ranging from community resources to strong open source software support to open schematics and open licensing.

14,000ppi MicroLED display is world’s densest, only 0.48mm across

Posted on by mixos

Mojo Vision, a Californian startup dedicated to the development of pervasive, yet unobtrusive augmented reality solutions which it calls “Invisible Computing”, has unveiled a tiny MicroLED display, only 0.48mm in diameter, boasting a record 14K PPI pixel density. via www.eenewseurope.com

Smaller than a grain of rice, the prototype display delivers a pixel density 300 times greater than current smartphone displays and draws about a tenth of the power required by today’s LCD displays while being 5 to 10 times brighter than OLEDs for viewing outdoors.

According Mojo Vision, with a world record pixel pitch of 1.8µm and a pixel density over 14,000ppi, the monochrome display technology is the company’s first important step in succeeding in its mission to deliver “Invisible Computing”, enabling people to receive and share information that is immediate and relevant without distracting them from the world in front of them.

“Creating screens with smaller pixels will deliver a nearly invisible low-power display without the distraction of today’s mobile devices. This prototype demonstrates the capability MicroLEDs have to create more seamless AR experiences”, said Mojo Vision’s VP of Displays, Paul S. Martinat in a statement.

Although one could argue that making the hardware unobstructive or nearly invisible won’t stop the displayed content from distracting the wearer from having meaningful social interactions. Unresponsive wearers will just look plain absent-minded rather than locked into their smartphone (at least the smartphone gives a “do not disturb” cue).

Mojo Vision – www.mojo.vision

Oscilloscope Differential Probe USB Power Supply

Posted on by mixos

By Dr. Martin Oppermann (Germany) & www.elektormagazine.com

In his article published in the July & August 2016 issue, Elektor author Alfred Rosenkränzer presented a wonderfully simple differential probe for oscilloscopes, based around the AD8479 precision differential amplifier. I built one of them immediately and found it particularly suitable for measurements in the audio range, for example. But one small detail was not covered in this article: the power supply used for the probe (or for several of them). Practically all modern oscilloscopes have a USB port on the front panel for data output. Since the power consumption of a probe is very low, it makes sense to use this socket to power the probe. Figure 1 shows the schematic of the circuit I decided upon.

Oscilloscope Differential Probe USB Power Supply – [Link]

The Raspberry Pi Tutorial – A Beginner’s Guide from thepihut.com

Posted on by mixos

The Raspberry Pi has a number of ports which you will use to control the Raspberry Pi, and it can use to control other devices. Your Raspberry Pi will have the following ports:

  • USB – USB ports are used to connect a wide variety of components, most commonly a mouse and keyboard.
  • HDMI – The HDMI port outputs video and audio to your monitor.
  • Audio – The audio jack allows you to connect standard headphones and speakers.
  • Micro USB – The Micro USB port is only for power, do not connect anything else to this port. Always connect the power after you have already connected everything else.
  • GPIO – The GPIO ports allow the Raspberry Pi to control and take input from any electronic component.
  • SD card slot – The Raspberry Pi uses SD cards the same way a full-size computer uses a hard drive. The SD card provides the Raspberry Pi with internal memory, and stores the hard drive.

What you will need to get started

In addition to the micro-USB provided to power the Raspberry Pi, you are going to need a keyboard and mouse to control it, and a screen so you can see what you are doing.

You will also need an SD card, we will have provided one with Raspbian already loaded onto it.

… continue reading

Zero Multi-Power Supply is Battery supported

Posted on by mixos

This is a breadboard friendly power supply with multiple input options. It can be powered from a USB port or from attached AAA batteries. It also supports Lithium battery input, Single cell(3.7V) and Dual Cell (7.4V,Max:9V) all supported. Output is 2 way adjustable (2-Way Adjustable 1-5V output) or Way Wide range & Adjustable (Vin-14V) output*. The project is currently live on kickstarter and has 19 days to go.

i.MX8M Mini based module features Gryfalcon neural accelerator

Posted on by mixos

The i.MX8M Mini SOM – Building Block with Embedded Artificial Intelligence Capabilities

i.MX8M Mini SOMs offer a compact System-on-Module platform with robust processing power and artificial intelligence acceleration using Gyrfalcon’s Lightspeeur® 2803S Neural Accelerator – designed for next generation Edge AI applications using the standard TensorFlow, Caffe and PyTorch model development frameworks.

SolidRun’s i.MX8M Mini SOMs harness NXP’s Arm Cortex A53 single/dual/quad core 1.8Ghz (with single Cortex M4 general purpose processor), i.MX8M Mini SoC built with advanced 14LPC FinFET process technology. This cutting-edge building block is tailor made for a wide range of IoT and industrial applications, featuring up to 4GB LPDDR4, 2 x USB 2.0, powerful network connectivity options including Bluetooth and optional WiFi, PCIe 2.0 and robust multimedia features including 20 audio channels (32bits), MIPI-DSI, and 1080p encoder and decoder.

i.MX 8M Mini SOM with HummingBoard Pulse

Numbers referenced below are for Gyrfalcon 2803S chip.

  • High performance : 24 TOPs/Watt
  • Up to 16.8 TOPs @ 300MHz
  • Low Power: 16.8 TOPs @ 700mW
  • Support for: ResNet, MobilNet and ShiftNet
  • Supported standard AI frameworks such as TensorFlow, Caffe, PyTorch including pre-trained AI models

i.MX8M Mini Advantages

Processing Power

The i.MX8M Mini SOM based on NXP’s robust i.MX8M Mini Arm Cortex A53 processor offers a range of features tailor made for embedded Artificial Intelligence and IoT. With AI Acceleration and a range of connectivity features – SOM i.MX8M Mini is perfect for Edge AI, IoT and next generation artificial intelligence applications.

AI Acceleration

i.MX8M Mini SOM is ready to fuel the next generation of Artificial Intelligence applications – harnessing a powerful deep learning CNN AI acceleration microprocessor. The 9 x 9mm accelerator, based on Matrix Processing Engine architecture, offers multi-dimensional processing for extremely high speeds at very low power (24 TOPs/Watt).

Tiny & Scalable

At only 47 x 30mm i.MX8M Mini SOM is a complete powerhouse with a tiny footprint, making it the perfect building block for embedded applications of all sizes. With SolidRun’s design approach of mix-and-match, you can pick up the right SOM configuration for each development stage and offer a range of deployment options.

The i.MX 8M Mini SOM is “coming soon” starting at $56. More information may be found on SolidRun’s i.MX 8M Mini SOM product page.

PocketScreen is a Palm Sized Arduino-Compatible Multi-Purpose Device

Posted on by Tope Oluyemi

Arduino lovers looking for a tiny development board and Arduino compatible multitool, may look no further, because a new tiny board is being developed. Engineers at Zepsch based in Ludwigsburg Germany, have developed the PocketScreen, a small form Arduino compatible multi purpose device.

PocketScreen springs from a Kickstarter funding campaign. Last year, Zepsch ran a crowdfunding campaign for PocketStar, a keychain sized retro gaming device built off of the Arduino platform. The PocketScreen’s most pronounced feature is the combination of microcontroller, color OLED screen, micro SD card reader, hotkey buttons, RGB status light, and charging module. The system footprint is half of the previous PocketStar, with only the vibration motor and three buttons absent.

The photos on the campaign page shows all of the components that the PocketScreen can replace, and a breadboard full of wires and pieces that can be replaced by the ‘star’ unit. The chip has a slim 22 x 25 x 5 millimeter footprint, about the size of a 50 cent coin piece when the board is folded behind the screen. The core of the system is the ATSAMD21G18A microcontroller, capable of displaying graphics at more than 30 frames per second. The product page has a demonstration video that shows a unit plugged into microUSB for receiving power, and then loading and playing a video when the microSD card is inserted and a button is pressed. Available also are analog and five digital pins which enables extra functions to the PocketScreen. The campaign page provides suggestions for end uses, like keychains and pocket watches.

The PocketScreen is noteworthy of not just its small design, but also how many features it has. The group maintains an active online community, and a library of pre-programmed files on its website. The device offers enough power to display 3D graphics and videos on the screen at over 30fps. The campaign for the PocketScreen is already successful and ends on June 18, 2019, with shipping expected to start sometime around August 2019. If it reaches the €20,000 ($22,370 USD) stretch goal, a wireless ESP8266EX WiFi chip will be included, paving the way for more possibilities for the PocketScreen.

For full specifications and a complete list of all available pledge options, stretch goals and possible applications, visit Kickstarter project.

ANAVI Gas Detector – An ESP8266-powered air quality monitor

Posted on by mixos

ANAVI Gas Detector is an ESP8266-powered, open source, Wi-Fi dev board for monitoring air quality and detecting dangerous gases.

ANAVI Gas Detector is an ESP8266-powered, open source, Wi-Fi dev board for monitoring air quality and detecting dangerous gases. It supports popular analog MQ gas sensor modules such as MQ-135, MQ-2, MQ-3, etc. Furthermore, it comes with slots for mini OLED display and up to three additional I2C sensor modules. All these features make ANAVI Gas Detector appropriate for developers, makers, students and open source enthusiasts interested in home automation.

ANAVI Gas Detector is fully compliant with Arduino IDE, PlatformIO, the popular open source home automation software, Home Assistant via the lightweight messaging protocol MQTT and ThingSpeak, the open IoT platform with MATLAB analytics. With ANAVI Gas Detector it is easy for developers to focus on the software by easily building and flashing their own versions of the source code. Tech savvy users can easily integrate ANAVI Gas Detector in their existing open source home automation platforms.

ANAVI Gas Detector is an entirely open source project that combines open source hardware with free and open source software. KiCAD and OpenSCAD were used to design ANAVI Gas Detector. Source code and schematics are available at GitHub. All units will be manufactured in Plovdiv, Bulgaria. Getting started with ANAVI Gas Detector is easy. No soldering is required. Comprehensive user’s manual with exact steps for using ANAVI Gas Detector will be provided.

Features

  • Tensilica L106 32-bit processor (ESP8266)
  • Wi-Fi 802.11 b/g/n
  • Dedicated slot for MQ gas sensor modules (MQ-135, MQ-2, MQ-3, etc.)
  • 4 I2C slots for mini OLED display and sensor modules for temperature, humidity, light and barometric pressure
  • UART pins for flashing custom firmware and debugging
  • Dimensions: 75 mm x 40 mm

The project is going to be live soon on Crowdsupply.com

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