This weekend marked the 49th anniversary of the legendary Intel 4004 microprocessor, and to celebrate [Erturk Kocalar] combined the old and new in this intriguing Retroshield 4004 / Busicom 141-PF calculator project. We have reported on his Arduino shield project before, which lets you connect a variety of old microprocessors to an Arduino so you can experiment with these […]
CELEBRATING THE 4004’S 0X31ST ANNIVERSARY Continue Reading
To get started with Arduino, you’ll need some basics. In this tutorial, we’ll go beyond a little blinky light and teach you about: Variables Input and Output pins Sensors and reading data Mapping results Functions In another tutorial, I’ll cover classes and why we might use them. But, we might still make a little light
Vdd brownouts are among the most common antipodes of microcontroller design – they are especially annoying, as their presence is not easy to detect. Diodes Incorporated provides a new family of easy-to-use supply voltage monitor ICs. From a principal point of view, the parts are not difficult to understand. Simply connect them to VCC and
Diodes Incorporated’s APX803S-31SA-7 helping you with Voltage Trips Continue Reading
This Arduino based digital clock is synchronized by the 60Hz power line. It has a simple and inexpensive common anode 4 digit 7 segment display which shows hours and minutes. It uses a cross over detector to detect when the incoming 60Hz sine wave crosses the zero voltage point and derives a 60 Hz square
Arduino Digital Clock Synchronized by the 60Hz Power Line Continue Reading
In the very early days of the PC revolution the only way to have a computer was to build one, sometimes from a kit but often from scratch. For the young, impoverished hobbyist, leafing through the pages of Popular Electronics was difficult, knowing that the revolution was passing you by. And just like that, the days of
RIDING THE NOSTALGIA TRAIN WITH A 6502 FROM THE GROUND UP Continue Reading
Introduction Sometimes, it is necessary to add a temperature indicator into your projects. Therefore, in this tutorial you will learn how to hack your analog Voltmeter and convert into an analog Thermometer using Arduino and a DS18B20 temperature sensor. DS18B20 Module In the first place, the Maxim DS18B20 digital thermometer provides 9-bit to 12-bit Celsius
Arduino Analog Thermometer With DS18b20 Module Continue Reading
The 74181 ALU (arithmetic/logic unit) chip powered many of the minicomputers of the 1970s: it provided fast 4-bit arithmetic and logic functions, and could be combined to handle larger words, making it a key part of many CPUs. But if you look at the chip more closely, there are a few mysteries. It implements addition,
Inside the vintage 74181 ALU chip Continue Reading
A computer’s arithmetic-logic unit (ALU) is the heart of the processor, performing arithmetic and logic operations on data. If you’ve studied digital logic, you’ve probably learned how to combine simple binary adder circuits to build an ALU. However, the 8008’s ALU uses clever logic circuits that can perform multiple operations efficiently. And unlike most 1970’s
Reverse-engineering the ALU of 8008 microprocessor Continue Reading
What’s inside a TTL chip? To find out, I opened up a 74181 ALU chip, took high-resolution die photos, and reverse-engineered the chip.1 Inside I found several types of gates, implemented with interesting circuitry and unusual transistors. The 74181 was a popular chip in the 1970s used to perform calculations in the arithmetic-logic unit (ALU)
Inside the 74181 ALU chip: die photos and reverse engineering Continue Reading
The DueProLogic makes programmable logic easy with an all inclusive development platform. It includes an Altera Cyclone IV FPGA, on board programming, four megabit configuration flash, and an SD connector for add on memory. You can create your HDL code, program it into the flash and interact with the hardware via a Windows PC. This
DueProLogic – USB-CPLD Development System Continue Reading
