Arduino Watch Sport


by Alexis Ospitia @

In today’s technology, especially electronics have come a long way, to the point that today can make projects a few years ago were very complicated to implement, thanks to these technological advances are now able to design and implement our houses projects.

and through this article I come to show you my new project, which consists of a wristwatch, so I called Arduino Watch Sport.

Arduino Watch Sport  – [Link]


Serial Port Communication in Excel (VBA)


Maurizio @ discuss how we can do serial communication in Excel environment. He writes:

The purpose of this article is to demonstrate how you can perform serial port communication in the VBA (Visual Basic Applications – script editor included in any typical Microsoft Excel distribution) but without using the MSComm control or any other third party add-on or ActiveX.

Serial Port Communication in Excel (VBA) – [Link]

PC Thermometer Using D-sub Connector

One of the element in medical is the temperature, it prevents the buildup of humidity in the operating room, prevents the doctor and nurse from sweating while operating and refrigeration of medicines. In medical applications, reliability of the components is critical. The TE Connectivity D-sub connector has been accepted by the electronic industries for their rugged design and ease of application.

The circuit is a simple PC thermometer using the 5747840-6, a male D-sub connector of TE connectivity as a way of communication to the computer. The LM2936Z is a 5V regulator that provides input voltage to U1 and U2. The DS1621 (U1) is a digital thermometer and thermostat sensor, which indicates temperature for the device. The other DS1621 (U2) is optional for outside temperature monitor or a second reference source to be monitored. Software is used in the PC so that the temperature can be monitored in the PC’s screen.

The PC thermometer is applicable in situations where the room’s temperature is being monitored at a distance like in the operating room, blood bank, and other hospital applications.

PC Thermometer Using D-sub Connector – [Link]


WebRadio player 2 (ARM 32-bit Cortex-M0)


Vassilis Serasidis build a simple Webradio player based on ARM 32-Bit Cortex-M0. He writes:

On 31 August 2015 I got the new WIZnet platform board, the WIZwiki-W7500 that is based on a Cortex-M0 cpu at 48MHz with 128 kBytes of flash memory and 48 kBytes of RAM shared with the hardwired TCP/IP core. The RAM amount used by the TCP/IP core can be upto 32 kBytes leaving the rest 16 kBytes to the user (32 + 16 = 48 kBytes of RAM). The W7500 is a 3.3V device but according to the WIZnet the board’s I/O pins are 5V tolerate. Moreover, the board has the same pinout with the Arduino UNO. Combining this board with a VS1053 mp3 decoder board you can build a very nice Icecast Internet streams player (WebRadio player) that can plays internet audio streams upto 320 kbits/second (320 kbps). Of course the limited RAM on W7500 receiver side (16 kBytes) is not enough to cover big data delays between your internet connection gateway (your ADSL router) and the Icecast server.

WebRadio player 2 (ARM 32-bit Cortex-M0) – [Link]

ESP8266-based touchscreen clock and light controller with WiFi

Spiros Papadimitriou build a nice clock based on ESP8266 Wifi and 2.4″ LCD module. He writes:

This was a week-long hack, to build a simple touchscreen clock, with the following features:

Graphical UI with touch (no buttons)
Clock synchronization over NTP
Ability to control WiFi-connected LED lamps
Web-based configuration UI

This project was partly inspired by the Chumby (remember that?) and by our old X10 light controller (remember those!?). Current iteration’s cost is probably comparable to a used Chumby (which also has a lot more features), but it’s more fun this way. :) However, the cost could be taken down to ~$10.

ESP8266-based touchscreen clock and light controller with WiFi – [Link]

Build Your Own PICKit 2 Programmer

7316084 has build a nice version of PICKIT Programmer:

This is my PICkit 2 clone design. Its based on a simplified version of the Microchip PICkit 2 schematic and only supports 5v parts. It works with all the Microchip software including MPLAB, MPLABX,the PICkit 2 GUI Programming software and the PICkit 2 command line software.

It can be used with the PICkit 2 GUI Terminal Software and the PICkit 2 GUI Logic Analyzer. Best of all its an all leaded design that you can build in about an hour if you have of the parts.

Because this design is simplified and uses a fixed voltage reference, the programmer voltage cannot be controlled by the PICkit 2 software settings to lower the voltage. It also cannot do the “Vpp First” mode which in rare cases you may need to re-program a PIC that has a very fast internal oscillator and internal MCLR enabled.

Build Your Own PICKit 2 Programmer – [Link]

Arduino Project: MP3 player using Arduino and DFPlayer mini MP3 player module

Building an MP3 player with Arduino is extremely easy. We use the DFPlayer mini in order to build a simple MP3 player. The MP3 player has 3 buttons, in order to Play/Pause, to load the next song and one in order to load the previous song. In this video we are using an Arduino Uno, but you can use any Arduino board you like.

Arduino Project: MP3 player using Arduino and DFPlayer mini MP3 player module – [Link]


Understanding silicon circuits: inside the ubiquitous 741 op amp


Ken Shirriff’s blog looks inside the famous 741 OPMAP and discuss how it’s made and how it’s working:

The 741 op amp is one of the most famous and popular ICs[1] with hundreds of millions sold since its invention in 1968 by famous IC designer Dave Fullagar. In this article, I look at the silicon die for the 741, discuss how it works, and explain how circuits are built from silicon.

Understanding silicon circuits: inside the ubiquitous 741 op amp – [Link]


Elektor DDS Function Generator


this is a DDS Funtion Generator by Theodorou Gerasimos:

DDS chips are readily available, greatly simplifying the design of the analog part of a wide-range function- or signal generator. All you need to do (they say!) is choose one, add some suitable output circuitry, pick a microcontroller, provide a user interface and start programming. To which we reply: sweet dreams, here is the real story: power to the AD9834!

Elektor DDS Function Generator – [Link]


19″ system of enclosures will provide you unexpected space


With plug-in enclosures from Fischer Elektronik, it´s easy to solve placing your device into a 19“ „rack“.

What enclosure to use for your electronic device and how to sort them when there are several ones on one place? That´s the question reaching almost to beginnings of electronics. No wonder, that since those times a lot of solutions were developed, which were so good, that they´re actual even nowadays. One of such examples is also a known modular 19“ system (482,6 mm wide), where various electronic devices are placed into a carrying rack.
This system is highly modular and at a fixed width it enables to use various height of devices. That´s why in a 19“ system can often be found thin (slim) devices only few centimeters high, but also giants with a height of several tens of centimeters.

Company Fischer Elektronik as a well known producer of device enclosures, heatsinks and connectors, produces a wide range of enclosures suitable for the 19“ system, where you certainly can find a type suitable for your application. A good example is the VESA series. VESA is a universal series of robust enclosures with removable top plate (cover). It´s available in width of 1U to 6U, what represents 43,8 – 264 mm.

Available are three various depths – 260, 300 and 360 mm. The enclosure consists of easy-to-assemble aluminium profiles. Guiding slots inside enable easy installation of PCBs and also available are various accessories and modifications like hands, lock and panels with ventilation openings. Into the enclosure, it´s possible to place a mounting plate (MPH) into the enclosure, which creates as if a double deck and also TS CE mounting rail. Drawings and detailed information about this enclosure can be found on page N8 in the Fischer enlosures catalogue.

19″ system of enclosures will provide you unexpected space – [Link]