GPS Tracker for Alzheimer’s Patients


by LoganP2 @

The GPS tracking device is composed of a microcontroller, GPS module, cell module, and batteries all housed in a 3D printed case. The microcontroller is programmed to communicate with both the cell module and GPS module. When the GPS module is not within a user-specified boundary, the device will send a text message alert. We made a device that can track people suffering from Alzheimer’s and Dementia could greatly benefit the quality of life of both that person suffering and the caretaker.

GPS Tracker for Alzheimer’s Patients – [Link]

Arduino Fuel Injector Tester

Jeremy Lang wanted to test some fuel injectors for a car he is restoring so he build a tester based on Arduino Pro Mini. Watch the video above to see the tester working and you can find the design files and code on Dropbox.

Arduino Fuel Injector Tester – [Link]

Euroclamp CEM – DIN rail enclosures for every PCB


Series of enclosures CEMxx in versions for horizontal and vertical PCB placing offers wide possibilities of usage.

17,5 mm/ 22,5mm but also 35mm – in these width is available well-proven series of DIN-rail enclosures Euroclamp CEM17, CEM22 and CEM35, which was introduced to you in our article Gain more space on the DIN rail with housings Euroclamp CEM22.
Enclosures are delivered “complete”, i.e. including a Din rail holder and the top cover. The only, what´s necessary to buy (depending on a target application) are connectors (terminal blocks) labeled as ML25x, i.e. ML252, ML253 and ML254 or PV02 pin headers (PV03, PV04) dedicated for SH02 plug-in connectors (SH03, SH04).

Novelties in our offer are terminal blocks ML253-5-D-LI and ML253-5-S-LI suitable for CEM35 enclosures. From recent types of the ML253 series they differ only in somewhat longer pins (to be soldered into a PCB), what enables them to “lay” directly on a PCB (no need to make a cut-out for a connector).
Enclosureshave a UL 94 V-0 flammability and they are of a grey color RAL7035, other colors upon request. Upon request also imprinting and housings modification are available. Detailed information will provide you datasheets at particular types. Comprehensive overview of Euroclamp connectors and enclosures will provide you the Euroclamp short-form catalogue.

Euroclamp CEM – DIN rail enclosures for every PCB – [Link]

LED DC Voltage Indicator



This design is a type of indicator that is used in voltage reading. It operates as an indicator rather than a meter that drives LED for voltage indication. Voltage thresholds are 1.5, 3, 4.5 and 6V. Above each incremental threshold an additional LED turns on.

LED DC Voltage Indicator – [Link]


Starting with ATTiny13



As any beginner electronics hobbyist I have recently came to conclusion that using Arduino (or even Mega328) for small projects is neither cost-effective or educational (I’ll explain why later).

Another reason for writing this article is that I came across few ATTiny13A-SSU chips @ less than $0.90 each, which is even lower the official retail price, so I just had to buy 5 of them, although I didn’t know at the time whattahellamigointodowithit what is it really capable of.

Starting with ATTiny13 – [Link]

Getting more I/O pins on ATTiny with Shift Registers


by silentbogo @

If you previously worked(or currently working) with small 8-bit microcontrollers, like ATTiny or PIC12, you’ve probably encountered a fundamental problem of not having enough GPIO pins for your needs or project requirements.

Upgrading to a larger MCU is only one of the options, but as usual there is an alternative. In this article I will explain how to use shift registers in some common situations in order to expand the I/O capacity of your microcontroller. As an example I will use an ATTiny13A and a 74HC595 shift register.

Getting more I/O pins on ATTiny with Shift Registers – [Link]

Low cost DC millivolt source


Dilshan Jayakody has published a new project, a DC millivolt source:

DC millivolt sources are often used for thermocouple simulations, DMM, ADC and analog circuit calibrations and fault findings, etc. Most of the DC millivolt circuits are based on expensive (and sometimes hard to find) operation amplifier like OP7, LT1077, etc. In this article we introduce low cost DC millivolt source based on commonly available LM308 precision operational amplifier, ICL8069 low voltage reference and 78L05 voltage regulator ICs. This millivolt source is design to obtain 200mV – 700mV DC output with 100Ω impedance. At the time of writing we spend Rs.800.00 (LKR) to complete this project.

Low cost DC millivolt source – [Link]

Touchscreen Internet Radio using Raspberry


Make this super easy and cool looking 2.8″ touchscreen Internet Radio that can be controlled with PC, Smartphone and basically every machine that has got a browser and an internet connection..

Touchscreen Internet Radio using Raspberry – [Link]

The Advantages (and Drawbacks) of DC-to-DC Voltage Converters with Integrated Inductors


by Steven Keeping:

Such is the popularity of DC-to-DC voltage converters (“switching regulators”)––due to their high efficiency across wide input- and output-voltage ranges––that chip makers have focused a lot of research dollars on squeezing the essential components of the devices into modules. These modules typically include pulse-width-modulation (PWM) controllers and switching elements in a single, compact package, easing the design work for the engineer.

However, until recently, it has proven difficult to include the energy-storage device (the inductor) inside the package. This has dictated that the engineer must specify, source, and design-in the inductor as a peripheral component, adding complexity and consuming board space. Now, a new generation of high-frequency switching regulators has enabled the use of smaller inductors enabling the devices to be housed inside the component vendor’s package.

The Advantages (and Drawbacks) of DC-to-DC Voltage Converters with Integrated Inductors – [Link]

The Miniaturization of GPS Systems



Positioning is an increasingly important part of an embedded design as more and more devices become mobile. Adding this capability into equipment that has to be smaller, lighter and have longer battery life is a major challenge. At the same time there are the challenges of implementing an effective wireless design with high performance and low power, while meeting the requirements of the project timeline and the certification authorities.

These challenges are being addressed by a new generation of wireless modules that are using the latest miniaturization technologies to make use of the various global positioning systems (GPS) around the world, with the footprint of GPS modules falling dramatically over the last few years.

The Miniaturization of GPS Systems – [Link]