Category Archives: Elektronika

Elektronika, Linux

Raspberry Pi Zero: the $5 computer

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Of all the things we do at Raspberry Pi, driving down the cost of computer hardware remains one of the most important. Even in the developed world, a programmable computer is a luxury item for a lot of people, and every extra dollar that we ask someone to spend decreases the chance that they’ll choose to get involved.

The original Raspberry Pi Model B and its successors put a programmable computer within reach of anyone with $20-35 to spend. Since 2012, millions of people have used a Raspberry Pi to get their first experience of programming, but we still meet people for whom cost remains a barrier to entry. At the start of this year, we began work on an even cheaper Raspberry Pi to help these people take the plunge.

Four fathers!?!??

Today, I’m pleased to be able to announce the immediate availability of Raspberry Pi Zero, made in Wales and priced at just $5. Zero is a full-fledged member of the Raspberry Pi family, featuring:

  • A Broadcom BCM2835 application processor
    • 1GHz ARM11 core (40% faster than Raspberry Pi 1)
  • 512MB of LPDDR2 SDRAM
  • A micro-SD card slot
  • A mini-HDMI socket for 1080p60 video output
  • Micro-USB sockets for data and power
  • An unpopulated 40-pin GPIO header
    • Identical pinout to Model A+/B+/2B
  • An unpopulated composite video header
  • Our smallest ever form factor, at 65mm x 30mm x 5mm

Raspberry Pi Zero runs Raspbian and all your favourite applications, including Scratch, Minecraft and Sonic Pi. It is available today in the UK from our friends at The Pi Hut and Pimoroni, and in the US from Adafruit and in-store at your local branch of Micro Center. We’ve built several tens of thousands of units so far, and are building more, but we expect demand to outstrip supply for the next little while.

One more thing: because the only thing better than a $5 computer is a free computer, we are giving away a free Raspberry Pi Zero on the front of each copy of the December issue of The MagPi, which arrives in UK stores today. Russell, Rob and the team have been killing themselves putting this together, and we’re very pleased with how it’s turned out. The issue is jam-packed with everything you need to know about Zero, including a heap of project ideas, and an interview with Mike Stimson, who designed the board.

MagPi #40 in all its glory

If you’re looking for cables to go with your free Zero, head over to the newly revamped Swag Store, where we’re offering a bundle comprising a mini-HDMI and a micro-USB adapter for just £4, or alternatively subscribe and we’ll send you them for free.

cablebundle

Happy hacking!​

Sumber: https://www.raspberrypi.org/blog/raspberry-pi-zero/

Arduino, Elektronika

Arduino and 7 segment LED display decoder

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In this instructable i will explain how to connect 7 segment display, decoder and arduino. It´s pretty easy. At first we have to learn something about decoder. I´m using BCD to 7 segment decoder. My is D147D, this is old chip, but the newer are similar. Documentation about one of them you can find here . Description of D147D you can see on picture two. There are four pins for sending BCD code to the decoder (ABCD). Table of BCD code you can see on third picture. But there is small problem. I thing, that pins are inside of chip connected to VCC source. If you want set logic zero on input, you must connect this input to the ground. Continue reading Arduino and 7 segment LED display decoder →

Elektronika

Using the 74xx47 BCD to Seven-segment display

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The 74xx47 chip is used to drive 7 segment display. You must use the 74xx47 with a common anode 7-segment display (e.g. Kingbright part number SA03). The input to the 74xx47 is a binary number DCBA where D is 8s, C is 4s, B is 2s and A is 1s. The inputs DCBA often come from a binary counter.

The display is only sensible if the binary number is between DCBA=0000 (0) and DCBA=1001 (9); this is called Binary Coded Decimal or BCD for short. If the number is larger than 9 you get a strange output on the display. Try this out by moving your mouse over the truth table. Continue reading Using the 74xx47 BCD to Seven-segment display →

Elektronika

The AVR Microcontroller Digital I/O Ports

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Introduction to AVR Digital Input/Output

Atmel AVR 8-bits microcontrollers provide pins to take in/output information form/to the outside world in the form of logic values. These pins are usually organised in groups of eight (8) and referred to as a port. The AVR use the alphabet to name these port, example PortA, PortB, etc. The figure below shows the pins of an AVR 8-bit microcontroller which has four (4) digital I/O ports: PortA, PortB, PortC and PortD. The pins of PortA are: PA0 – PA7. 

Continue reading The AVR Microcontroller Digital I/O Ports →

Elektronika

100 LED 10 band Audio Spectrum atmega32 MSGEQ7 with peak hold and fall down

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 MSGEQ7 and atmega32  based  Audio Spectrum.
10 level height and 10 band width.
peak hold and fall down display style

Step 1: Components list

      components list
————————————-
1, atmega32 – 1
2, MSGEQ7 Audio spectrum ic -1
3, veroboard – 1
4, RED  Bar graph  LED  -10
5, 20 pin ic base –   10
6, BC557 -10
7,Resistors – 330Ω  -10
–  8.2KΩ  -1
–  200kΩ  -1
– 22k Ω    -2
– 10k Ω    -1
8, ULN2803     ic    – 2
9, 7805   5V regulator ic -1
10, crystal – 16Mhz -1
11,Capacitors-   22pf-3,  0.01uF -1, 0.1uF  – 2
12, single-strand wire Continue reading 100 LED 10 band Audio Spectrum atmega32 MSGEQ7 with peak hold and fall down →
Elektronika

Convert an ATX Power Supply Into a Regular DC Power Supply

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A DC power supply can be hard to find and expensive. With features that are more or less hit or miss for what you need.

In this Instructable, I will show you how to convert a computer power supply into a regular DC power supply with 12, 5 and 3.3 volt outputs. For about $10!

Why use a computer (ATX) power supply? Well, they’re available everywhere, and they can output tremendous amounts of power in a small form factor. They have overload protection built right in, and even a 500W model can be reasonably priced with high efficiency. The voltage rails are incredibly stable. Giving nice, clean DC current even at high loads.

Plus, it’s likely that many of you simply have an extra one lying around doing nothing. Might as well get the most value for your investment. Continue reading Convert an ATX Power Supply Into a Regular DC Power Supply →