RC Servo Driver 0-5V


0 – 5V Servo Controller project will control a hobby type servo motor connected to it via a preset or external DC source.  This kit will be ideal add on in animatronics and motion control application.

This is a simple but a useful circuit to control a single servo motor.  Its an ideal add on to a RC Hobbyist tool kit. The DC input to this circuit should be 5 to 6 VDC.  DC signal is given to this board at connector marked CN1 (+V and GND).   You can also feed in a variable DC signal source at the other two pins on this connector to control the servo.  To use this signal source you need to place the Jumper link at J1 in the E position.  Alternatively, you can also control the servo motor by preset PR1 mounted on the PCB.  For this you need to place the Jumper link in the I position at J1.A Servo motor is connected at connector marked CN2 on the PCB.  This connector has all the pins clearly marked for connection to the servo.LED D1 is a power on indicator ,  Diode D2 provides a reverse polarity protection for the Microcontroller.


  • Microcontroller based design for greater flexibility and ease of control
  • Single Servo control via clearly marked berg connector
  • Clearly marked jumper to select signal source to control the Servo
  • Onboard preset for ready to control option for this kit
  • Power-on LED indicator
  • Diode protection for reverse polarity connection of DC supply to the PCB
  • Four mounting holes 3.2 mm each
  • PCB dimensions 45 mm x 32 mm

RC Servo Driver 0-5V – [Link]

500mA, 140V Boost/SEPIC/Flyback/Inverting DC/DC Converter with IQ= 6uA



Linear Technology Corporation announces the LT8331, a current mode step-up DC/DC converter with an internal 500mA, 140V switch. It operates from an input voltage range of 4.5V to 100V, making it suitable for use with a wide range of input sources found in industrial, transportation and avionic applications. The LT8331 can be configured as either a boost, SEPIC, flyback or inverting converter. Its switching frequency is programmable from 100kHz to 500kHz, enabling designers to minimize external component sizes. Burst Mode® operation reduces quiescent current to only 6µA while keeping output ripple below 20mVP-P. The combination of a high voltage MSOP-16E package and tiny externals ensures a very compact footprint while minimizing solution cost.

500mA, 140V Boost/SEPIC/Flyback/Inverting  DC/DC Converter with IQ= 6uA – [Link]


Pulse Generator 555


Pulse Generator project will generate a frequency in up to 180 KHz which can form a good test gear project.  This project is based on the classic 555 timer IC.


  • Input : 5-12 VDC Max @ 40 mA
  • Provides Square Waves
  • Range : Jumper selectable and preset tunable range of 1 Hz to 180 KHz
  • Power-On LED indicator
  • Berg connector for easy connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 47 mm x 40 mm

Pulse Generator 555 – [Link]

FUN but REAL: Nanotechnologies already in SOS electronic…


You certainly all know that you cannot trust Wikipedia completely. In our case, it’s not about the lack of credibility but more about incompleteness. It is generally respected that there are more things that belong in the area of nanotechnologies – when something needs to be done from scratch, iPod Nano or Nano-SIM card holder.

With these, there is undoubted trend towards reduction (we heard about Pico-SIMs / but that is more of a pikotechnologies that are not object of our interest as of now).
In conventional applications, size of a SIM is not critical. But in portable devices, every nanometer saved is good. That’s why we offer new Nano-SIM card holders. All are universal – they accept red, green, acorns or bells nano-SIM cards. In higher society hearts, diamonds, clubs and spades are used – these also can be crammed in the holders.

FUN but REAL: Nanotechnologies already in SOS electronic… – [Link]

Arduino Watch Sport


by Alexis Ospitia @ instructables.com:

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 @ dev.emcelettronica.com 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


pulsetronics.blogspot.com.ng 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]