Making the Electronics for CDM324 – 24GHz Doppler Motion Sensor

limpkin @ tries out the CDM324 / IPM165 Doppler effect sensor and proposes an amplification circuit to get the readings out of the sensor. He writes:

You may recall the article I wrote a couple of years ago about a nearly identical Doppler sensor, the HB100.
While the HB100 is using a 10.525GHz frequency, this new module uses 24.125GHz! This has the main advantage of being compatible with European regulations (ETSI #300 400) and having good penetration in dry materials. Moreover, as the main frequency is higher the patch antennas are smaller, hence the tiny 25x25x6mm module.

Making the Electronics for CDM324 – 24GHz Doppler Motion Sensor – [Link]

Arduino MKRFOX1200

MKRFOX1200 is a powerful board that combines the functionality of the Zero and SigFox connectivity. It is the ideal solution for makers wanting to design IoT projects with minimal previous experience in networking having a low power device.

Arduino MKRFOX1200 has been designed to offer a practical and cost effective solution for makers seeking to add SigFox connectivity to their projects with minimal previous experience in networking.

Arduino MKRFOX1200 – [Link]

10 or 12-bit DAC from the ATtiny85

David Johnson-Davies @ writes:

This article describes how to get up to two 10 or 12-bit digital-to-analogue outputs from an 8-bit Timer/Counter, such as in the ATtiny85. To test the routine I built a circuit which allows you to vary the brightness of two LEDs with two potentiometers:

10 or 12-bit DAC from the ATtiny85 – [Link]

Arduino analogue thermometer

@ writes:

With so many projects being made with the Arduino, we’ve seen a fair share of thermometer projects that try to do something different. This version, by, does so by adopting an older look.

Arduino analogue thermometer – [Link]

NanoPi NEO kit lets you build your own network-attached storage system for about $30

@ writes:

The NanoPi Neo is a tiny computer with a quad-core ARM Cortex-A7 processor, Ethernet and USB ports, and support for a number of accessories.

Measuring just 1.6″ x 1.6″ it’s smaller than most Raspberry Pi computers, and with a starting price of $7 it’s also an awfully affordable computer capable of running Ubuntu Linux.

NanoPi NEO kit lets you build your own network-attached storage system for about $30 – [Link]

MAX17055 – a 7μA operating current fuel gauge

by Graham Prophet @

Maxim Integrated has posted details of a battery charge monitor IC for which it claims the lowest quiescent current available, at 7µA. The 1-cell Fuel Gauge with Maxim’s ModelGauge m5 EZ algorithm can eliminate battery characterization issues.

MAX17055 – a 7μA operating current fuel gauge – [Link]

3D Gaming With Raspberry Pi & ExaGear

ExaGear is a virtual machine that implements virtual x86 Linux container on ARM and allows you to run Intel x86 applications directly on ARM. With this software by Eltechs you can run Intel x86 application on your ARM-based Mini PC simultaneously with common native applications.  It is like QEMU but 5 times faster! You can even run Windows applications on your ARM Mini PC if you install Wine.

ExaGear is user friendly software with transparent operation so you don’t notice a difference between running x86 applications on x86-based or ARM-based platform. Use your favorite applications on ARM-based devices and overcome platform compatibility.

In 2014 ExaGear Desktop was launched to allow running PC games on ARM-based devices (Raspberry Pi, Odroid etc.). ExaGear Desktop is an emulator too but dramatically differs from other emulators with its performance. ExaGear Desktop provides very low slowdown – 1.3 times instead of 50-100 times for other kind of emulators! It enabled to run such games as Arcanum, Disciples II, Fallout , Might And Magic VI,Pharaoh and Cleopatra, Stronghold Crusader, Sid Meier’s Alpha Centauri, Caesar 3 and many others on Raspberry Pi! You can learn how to set up these games from this article

However, there was one important issue. ExaGear Desktop didn’t support hardware graphics acceleration. That mean that games which actively use 3D were terrible laggy.

But amazing things happened!  A new version of ExaGear Desktop – ExaGear Desktop 2.0 is fully supporting 3D graphics acceleration on Raspberry Pi 2 and Raspberry Pi 3!

Check this video that run Counter Strike and Diablo II on Raspberry Pi:

More games are going to be added gradually and you can also suggest on the team your favorites. The team solved this problem after the OpenGL library was adapted into Raspberry Pi architecture, so they could develop some OpenGL calls to the hardware in order to solve the problem of 3D graphics.

This option is only available at Raspberry Pi since it is the only development board that uses OpenGL. You can learn more about this new era of gaming from this article and get ExaGear from here.


One wire controls LCD module

Rex Niven @ has a design idea on how to drive a character LCD using only one wire.

This hardware interface Design Idea reduces the connection to just one wire, allowing a basic microcontroller with limited I/O to drive a large display, either directly, through a standard interface, or even an opto-isolator.

One wire controls LCD module – [Link]

3-axis accelerometer performs wake-up in consumer designs

Kionix (Ithaca, New York), part of the Rohm Group, has added the KXTJ3 3-axis low-cost accelerometer that offers the performance of a more expensive accelerometer in a 2 x 2 x 0.9 mm form factor. By Graham Prophet @

The company presents the device as a high performance and reliable accelerometer in a package that is sized and priced to be embedded in anything and everything, from toys, wearables, remote controls to the SmartHome and IoT.

3-axis accelerometer performs wake-up in consumer designs – [Link]

Arrow’s New FPGA-Based IoT Maker Board

Arrow Electronics has introduced a new FPGA IoT Maker Board designed for end-to-end application development and optimised for cost. The Arrow MAX1000 board can be installed directly into a custom application or integrated on to a completely separate board.

It has been created for start-ups, universities or established equipment manufacturers who want a flexible, low cost FPGA platform for development, and the distributor can also supply customised variants.

At the heart of the maker board is a compact (11x11mm) Intel MAX10 FPGA with 8000 logic elements. This single chip includes integrated flash memory, a 1Msps 12bit ADC for analogue signals and a 3.3V power supply. Other features include embedded SRAM, DSP blocks, instant-on within milliseconds, and the ability to implement Intel’s NIOS II soft core embedded processor to perform microcontroller tasks. The board is equipped with an integrated Arrow USB-Blaster that enables the FPGA to be programmed directly from a PC and debugged using the free of charge Intel Quartus Prime Lite software.

The MAX1000’s power can be supplied as 5V from the USB port or via a separate pin. An Enpirion DC/DC converter with integrated coil then generates the 3.3V supply used on board. A MEMS oscillator provides the clock supply for the FPGA and the USB bridge. The low power, 3-axis acceleration sensor – also based on MEMS technology, can be used for position and motion detection, which are often required in IoT applications. External SDRAM can be used for storage of application data or as memory for the NIOS II processor.

Visit Arrow Electronics at

Source: eeDesign Europe