saliya ruchiranga: 2019

Wednesday, November 6, 2019

Atmega 8 FM Radio

This is the second FM Receiver i have made using MCU. last time i have used a arduino nano board to build this.this time i have decided to use a Atmega8 MCU and a external 16Mhz crystal instead of a arduino board.and i have ued a 16x2 LCD display + a external eeprom to save the stations.FM receiver module is the same as before its the TEA5767.eeprom and TEA5767 communicate via I2C.
i have utilized the rotary encoder to tune the stations, this time the rotary encoder don't use interrupts.

how ever i have used the arduino IDE to develop the code.it seems the arduino IDE is more convenient to use when come to development of new prototypes.

in action : https://www.youtube.com/watch?v=0shpN72BOTs

java swing face recognition

I have made a face detecting app using java swing and open-cv.web-cam support also added so live face detecting supports.you can select the cam source as well.

git repo : https://github.com/stark9000/opencv-java-face-recognition

this might need little tweaking to get it to pro level, this is basic testing app only.
source code is provided so you can dev it to your expectations.

java opencv Number Recognition

This is java and open-cv integrated number recognition system.i have added web-cam support to the project.

and i have included test image file for testing purposes. how ever if the web-cam not present project won't run.you can tweak this to work without web-cam.

github repo : https://github.com/stark9000/opencv-java-optical-number-recognition

Java Swing Browser

java Swing Browser

Recently i have to build a java swing embedded browser for some purpose.i came across the jcef - java chromium embedded browser.i have success fully integrated this to java swing application.

here you can see the video of " in action " of this browser :

https://www.youtube.com/watch?v=VR55LPYZfJo

here is the github repo : https://github.com/stark9000/javaSwingChromium

Happy coding :)

Wednesday, September 11, 2019

Arduino quiz contestant lockout system

i had to design and build a quiz contestant lockout system, so i have chosen to go with the Arduino platform.this unit is only capable of handling two contestants.and its a wired one as well.

in action : https://www.youtube.com/watch?v=dKK8XCV4Xio

lately i have updated the firmware to support desktop application coded with java swing.
this only tested with prototype hardware.

update in action : https://www.youtube.com/watch?v=0IqQbEGjjn8

DIY RGB Mood Lamp With Arduino And Neo-Pixels

i have made a mood lamp in the past using pic microchip, this time i have chosen Arduino and neo pixel ws2812b chip strips.structure that contain the assembly is similar to last one. one major change in this is the tube, its poly-carbonate tube.

in action : https://www.youtube.com/watch?v=hn1kaLV-WAI

DIY Simple Variac

I wanted to make a power guard system for a mains voltage operated equipment. power guard increases efficiency and acts as an insurance against power fluctuation that could damage electrical appliances and electronic devices.in our country its possible to receive high voltages above 220v in mains supply line. some times it goes below the 200v so the equipment plunged in to wall sockets get damaged. as a solution of course there's lot of products available in the market to purchase but i wanted to make a DIY one. to do this you have to have a variac transformer for get low and high voltages between 100v and 300v. variac is a expensive unit. so i thought of a way, get a transformer winded 220v to 400v AC then add a 220v ac dimmer to the transformer's input side.this way i can control the out put of the transformer.

ac out put of the transformer :

i have also added a dc out put channel to get dc volts :

output of the transformer with a load connected :

this project has come to an end with success.it took me long time to think of this simple way to accomplished what i wanted.

in action : https://www.youtube.com/watch?v=ns2auirpFP8

Sunday, June 30, 2019

attiny 13 - 85 Extention Board

I have recently desinged and ordered some pcb's from jlc pcb, pcb is for extending attiny13-85 chips out put pins using shiftregisters. after i have recived them i have assembeled them and carried out a test run.things turn out to be great and they worked as expected. beleow are some pictures of the test.in this test i have used attiny85 and arduino code to test run it.

youtube : 1 https://www.youtube.com/watch?v=ImjNgb4RH8o

youtube : 2 https://www.youtube.com/watch?v=dELStZ2RSrc&t=23s

UPS Trnsfomer Based Power Supply

I needed a powerfull power supply that can power few stuff parallelly at the same time, instead of buying one i decided to buil a one. with the previous working experience i knew a ups transfomer is suitable for this kind of thing.so i have teared up a old ups and got a transfomer.then i hand drawn the PCB for smoothing (rectifiying) circuit.i have used 2x 2200uf caps and "MOSPEC" diode for rectifiying the power comes out from the transfomer.after that i have packed it inside of a plastic box for safty and easy handling. Power comes out from this power supply can handle up to 4A without problem.

youtube: https://www.youtube.com/watch?v=e3jG2of5YcI