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# www.billy.gr

Electronics, Scuba, Ham Radio, Hardware, Software in no specific order...

## Sitemaps

- [XML Sitemap](https://www.billy.gr/sitemap.xml): Contains all public & indexable URLs for this website.

## Pages

- [Hello world!](https://www.billy.gr/) - Welcome to billy.gr Use the menus to navigate. Hardware On the hardware page you can find some designs (based on micro controllers 8051 - 8052 - AVR), programmers and smart cards. The projects are moving under the Projects , it's one in it is own page, the original page remains for reference. Software Software that
- [About](https://www.billy.gr/about/) - My name is Bill Nikolopoulos. Currently i am working as SE in a .com. You can find my complete bio on linkedin http://gr.linkedin.com/in/billnikolopoulos I am a register linux user with ID 68023. I spend most of my time using Linux for the following tasks: Bash (Shell Programming). LAMP (Linux, Apache, Mysql, PHP or Perl). Web
- [Arduino APRS Tracker](https://www.billy.gr/arduino-aprs-tracker/) - An APRS tracker is easy to build these days. I had decided to build one for portable use (plan is to be used on hiking, but also in my car) powered from Lithium Ion battery and with all components running on 3.3V. Transmit of APRS messages is done through a UV-5R. The tracker is powered
- [65% keyboard](https://www.billy.gr/65-keyboard/) - This is WIP or better my changelog for my DIY keyboard I was really inspired from the 65% keyboards out there, mainly the DIY versions/hardwired/3D printed ones I am a little picky...So these would be my specs for my own keyboard: USB-C (i don't care about Wifi/Bluetooth at this stage), fallback micro USBISO layout. This
- [QRP Watt Meter](https://www.billy.gr/qrp-watt-meter/) - A small QRP Watt Meter based on kitsandparts SWR bridge Kit: https://kitsandparts.com/bridge1.5.php Meter is a 500μA MS-52 60m x 60mm Case is 3D printed https://www.thingiverse.com/thing:4801005 I used the 120x80x45 variant, and a have created a difference face that fits a 60mm panel meter https://www.thingiverse.com/thing:5136830 Add a switch for FWD/REV and two BNC and of we
- [Home Network](https://www.billy.gr/home-network/) - I spend a lot of time working at home. To be honest this is the first i do after i finish my work at my company. It used to be a Cisco powered Home network wise (ages ago)...:))) I have setup a home network and i am always trying to improve it in order to
- [ESP8266 KISS](https://www.billy.gr/esp8266-kiss/) - I have used a couple of ESP8266 boards in the past mainly NodeMCU, D1 Mini and Adafruit Feather. In the long run and for some projects a wanted something simpler (not smaller), and iron out the mess with the different pinouts/functions per pin etc (my personal view of course) So here we go: The board
- [APRS tracker with DRA818V](https://www.billy.gr/aprs-tracker-with-dra818v/) - I am in the process of finishing the design a APRS tracker with a DRA818V since my previous Arduino APRS Tracker has a dependency of an external radio... Features list (still open) Cheap with a target price of 50 euro Powered from Lithium-ion battery 18650 or from a Lithium polymer battery. Built-in charger USB/RS232 or
- [GPS disciplined oscillator](https://www.billy.gr/gps-disciplined-oscillator/) - I needed a frequency reference for my projects (gpsdo style) at 10 MHz Fast forward: There are two designs (and i have build them both) that work out of the box and are stable enough for my measurements This one is FLL based https://www.instructables.com/id/GPSDO-YT-10-Mhz-Lcd-2x16-With-LED/ This one is PLL based https://www.eevblog.com/forum/projects/lars-diy-gpsdo-with-arduino-and-1ns-resolution-tic/ Pros and cons The FLL
- [Projects](https://www.billy.gr/projects/) - Projects page AVR based (completed) AVR Programmer an AVR910 clone AVR USB Programmer an USPasp clone AVR Clock/Timer an AVR based clock/timer (primary use my UV exposure box) ESP8266 ESP8266 KISS my own ESP8266 board HAM Radio Antenna analyzer a simple Antenna Analyzer Arduino APRS Tracker Running projects (TODO) AVR Based LED Dice AVR Stepper driver
- [MCS-52 Basic](https://www.billy.gr/mcs-basic-52/) - MCS BASIC-52 (also known as MCS-51 aka 8051/8052 basic) Intel MCS-51 (aka 8051) was developed by Intel in 1980. Somewhere around 1985 one of Intel engineers created a BASIC interpreter for this processor and the fun just started. One of my boards with the absolute minimum configuration... Atmel 89C52 (8052 clone) burned with the MCS-51
- [Raspberry Pi Weather Station](https://www.billy.gr/raspberry-pi-weather-station/) - Raspberry Pi Weather Station This is a Raspberry Pi Weather Station that collects data from a 433 MHz Temperature and Humidity sensor (Bresser THERMO/HYGRO RC TRANSMITTER), uuploads them on emoncms, Update: 30 September 2017. data.sparkfun.com goes bye bye on 31 Dec 2017. I am updated the code to use a different platform The 433 MHz
- [KN-Q7A](https://www.billy.gr/kn-q7a/) - Santa came early for me :) A KN-Q7A, building the kit as we speak. Finished KN-Q7A. Changelog A. Crystal Socket I have selected the 7.080 MHz - 7.100 MHz version of the kit. The supplied crystal is a 15.570 MHz. In order to cover the 7.110 MHz - 7.130 MHz (till i add a DDS
- [Frequency counter](https://www.billy.gr/frequency-counter/) - I must admin that i never had a frequency counter in my bench. Never understood why... My KN-Q7A doesn't have any frequency counter at all so i decided to build a small one for measuring the IF and LO frequencies and provide an indication of where exactly i am transmitting (till i add a DDS
- [Antenna Analyzer](https://www.billy.gr/antenna-analyzer/) - An Antenna Analyzer is a nice tool for the shack, although not used constantly it's the easiest way to test an antenna. This is my fork/clone of the famous Antenna Analyzer from K6BEZ. I must admit that they are many different designs in the internet most of them based on the work of K6BEZ, resulting
- [AVR USB Programmer](https://www.billy.gr/avr-usb-programmer/) - Due to fact the serial ports in many new computers are beeing removed + i hate to use a USB2Serial cable, it was about time to move to USB.. USBasp is a USB in-circuit programmer for Atmel AVR controllers. It simply consists of an ATMega48/ATMega88/ ATMega8 and a couple of passive components. The programmer uses
- [AVR Programmer](https://www.billy.gr/avr-programmer/) - A low cost AVR Programmer based on AVR910. History Somewhere back in time (i think it was 1997) Atmel started the family of AVR processors, small RISC based, easy to program and cheap. The first evaluation board i used was the A96021000C (AT89/90 series flash micro controller kit). To be honest i bought it because
- [AVR Dot Matrix Led](https://www.billy.gr/avr-dot-matrix-led/) - Playing with Dot matrix leds (5x7) the easy way Some theory first A 5x7 dot matrix led is what the name calls: a dot led in a 5x7 matrix :) The pinout is the following: Source: Kingbright In order to light the led you need to provide an active high(+Volts) to his ROW (RX) and
- [Arduino Bootloader](https://www.billy.gr/arduino-bootloader/) - Arduino among others has a really nice feature... The bootloader. Once you burn it on the chip you can upload your code without the need of an external programmer. I have started using it for my AVR projects but i came across on some issues so i compiled a COMPLETE list of what you need
- [AVR Clock](https://www.billy.gr/avr-clock/) - The project started as a timer for my PCB exposure box. However since it almost look like a clock when i was designing it i added some clock features and the AVR Clock + Timer + (maybe i will add a temperature sensor was born). It is split in two or if you add the
- [Ham Radio](https://www.billy.gr/ham-radio/) - Licensed Radio Amateur in Greece (DXCC Zone: 236 ITU Zone:28) My Call Sign is: SV1QFV QSL via Bureau (i am collecting QSL cards) or direct mail I do upload all my logs to loTW (Logbook of the World) and clublog Equipment ICOM IC-718 HyEndFed 3 band 10/20/40m Antenna in a vertical setup in my balcony
- [Software](https://www.billy.gr/software/) - Software Some software i have written in my little free time. You can find software in separated categories of Windows, Linux (Unix) Unix Software Make encrypted passwords This is a perl program that allows you to create encrypted passwords to use in a htaccess file and it is released under GPL License. If you have
- [Digital Modes Interface](https://www.billy.gr/digital-modes-interface/) - I wanted an interface to try the digital modes (PSK31,RTTY,JT65, SSTV,WSPR etc) without investing a huge amount of money for a commercial one. I came across to the work of the work of g4ilo SK (http://www.g4ilo.com/usblink.html) and decided to build one. All credits goes to him. Bill of Materials 1xUSB sound card (bought mine on
- [WSPR](https://www.billy.gr/wspr/) - I recently tried using the WSPR (http://physics.princeton.edu/pulsar/k1jt/wspr.html) to gather some reports for tests. So unless the reported power is completely wrong (and not 5) i heard VK5SIX from Australia to Greece. That's 14278 Km !!!
- [divx howto](https://www.billy.gr/divx-howto/) - My DivX HOWTO (in 10 simple steps) I decided to make my own divx movies and i realized that i must have a couple of masters and a Phd to do so :)) So i desided to write my own howto. What you will need: DivX Codec (use 5.2.1) MP3 Codec DVD2AVI vfapi-converter VirtualDub DVD
- [Hardware](https://www.billy.gr/hardware/) - Visit the projects page Dallas DS2250/DS5000 Evaluation Kit Dallas Evaluation Kit Version 2.0. This kit is a MUST for everybody you wants to start working with the 8051 microcontroller. Specifications 8051 core at 11.0592 MHz (16 MHz max.) 32KB of NVRAM 32 I/O lines LCD Connector with contrast abjust 2xRS232 Interface. One connected to the