APR7
Police in every vehicle
If you get off at high speed pursuits involving a flashing police vehicle behind you, this one is for you. Or should I say: if you get in trouble very often for speeding...
Michael from Project Lab has built this smart device that mimics police car pulling you over whenever you are speeding. It features: EM-406a GPS receiver, ATmega328 microcontroller with Arduino bootloader and some red&blue LEDs. There are also two white LEDs which represent headlights of a police car for even more realistic feel. When everything is put together, a predefined "zones" with speed limits are compared every second with the actual speed of the vehicle. When the actual speed is over the limit a police lights engage to alert you to slow down. If the lights don't turn off after you slow down - you better stop because you are probably getting pulled over by the real police.
Source: Project Lab
MAR31
Xarias - Embedded car computer
Xarias is embedded board computer for your car, just like the one we have seen a few days ago. It doesn't utilize OBD-II interface but instead it connects directly to all sensors that are being monitored.
It is based on ATmega32 microcontroller and here are some specs: speed, fuel consumption, engine RPM calculating, external and internal temperatures, opened doors information, automatic AC control and journey statistics gathering such as journey time, distance, average speed and fuel consumption. All info is displayed on graphical LCD with KS0108 driver. Screen selection and device setup is achieved by 4x3 keypad.
Microcontroller code is written in C (gcc) and is available for download on project page.
Source: Roman Pszonczenko
MAR11
Moving site to another server - again
Notice to all of our visitors!
Elektronika.ba website is once again moving to another server so you might not be able to access the page for next 3-4 days!
Sorry for the inconvenience!
MAR9
On-board computer for VW Golf Mk2
If you are like me – driving an older car without a fancy board computer showing outside/inside temperatures and other trip info, don't be sad, because now you can build one yourself.
You might say that this one is a bit more techy than those in newer cars because besides showing the standard: time and date, indoor and outdoor temperature, trip time, engine speed (rpm); you get more: cooling water (coolant) temperature, oil temperature, board voltage (V), battery charging current (A) and fuel quantity (in liters). Sensors used in this application are: DS1305 A/D converter, 3x DS18B20 1-wire temperature sensors, DS1305 RTC from Maxim-IC and ACS752-100 100A current sensor from Allegro (just like in this project). Data is processed with ATmega8 and displayed on 1x16 LCD display with backlight.
Source: Erik_G2RP
MAR2
Phone line recorder project published
How many times have you wished that you have recorder your recent telephone conversation? I have, many many times...
So I finally decided to make this happen by using PC and a piece of hardware (powered from USB) to record audio from phone line to MP3 format. I wanted this thing to work automatically, to start recording when any of phones in house is picked-up (line occupied) and stop recording when all phones are hung-up (line free).
FEB26
LED Wave Display
This is a LED Wave Display. When you want to stand out from the crowd, just stick your hand out and wave away. Custom message will be displayed right above your head.
On the other side, this is nothing else but a simple POV system. A few LEDs and a microcontroller together usually do the trick pretty well. In this circuit we also have a simple accelerometer switch, but it is nothing to worry - it is a simple mechanical switch constructed with a little weight mounted on a brass (looks like it) sheet.
I really wonder why no GSM phone manufacturer ever mounted this on the back of a phone for easy cab hailing. Now that's a cool idea for a project!
Source: Csaba Bleuer via HackedGadgets
FEB23
Halogen Bike Light
When choosing a bike light we often go for cheaper LED lighting. Cheap is usually not better, but also expensive doesn't necessarily mean better.
This is an example of how cheap and good it can get when doing it yourself. Requirements: Halogen light bulb for 6V, Atmel ATtiny45, LiPo/LiIon battery pack and a few other electronic components. Because most battery packs provide more than 6V when fully charged which is the maximum for this halogen bulb, ATtiny45 acts as a smart power regulator and keeps voltage of maximum 6V on the bulb.
Let's face it, you simply can't ride a bike at night without a headlamp and this is very cool solution to that problem.
Source: MnM Ringwald
FEB16
Source codes for my PIC projects published
After a little bit of thinking I have decided to go public with source codes for my two projects: Phone Call Alert and SMS Box.
Phone Call Alert (PIC16F84A) is a module that uses PSTN (fixed phone line) to remotely report an alarm condition. SMS Box (PIC16F877A) is a bit more complex and it is used to interface cheap Siemens GSM phones to a microcontroller for sending and receiving SMS messages (and more). I am publishing the source of SMS Box because I don't have any more time to work on it and it needs some improvements (actually just one): to replace my implemented "4-wire bus" with standard SPI bus. Sources are written in MPASM assembly and if someone changes the bus to SPI please let me know!
