I want more digital outputs!

Arduino offers quite a few digital outputs, but sometimes you want even more… When a keypad and LCD are connected, it doesn’t remain much free outputs. Today I found out a simple solution for that – EZ Expander shield. The shield utilises two shift registers, 74HC595 to ‘multiply’ digital outputs. Of course, the additional outputs […]

Hall effect sensor

Hall effect sensor is a sensor utilizing the Hall effect to measure magnetic field. Briefly speaking, it’s about diference in voltage charges within a conductor placed in magnetic field. CS3144E available in Nettigo store is a Hall effect sensor in TO-92UA package. It consists of voltage regulator, Hall voltage generator, differential amplifier and Schmitt trigger. […]

Processing – interface on steroids

Everyone who become interested, will, rather sooner than later, stumble on the name Processing. Processing is the software on which Arduino IDE is based. But, it isn’t the only common thing. At first – what is the Processing? It’s a programming language (under an open source license) with IDE environment created for the people involved […]

SelFly – from the space by glider

SelFly is an interesting (IMO) project of an autonomic (with autopilot) glider which will, elevated to a high altitude (about 30 km) with a weather balloon return home on its own. Good base for further experiments. All the more I was glad it’s Polish, domestic production :) . I hope the entire project will succeed. […]

Galvanic isolation: optocouplers

For sure, you have heard the term galvanic isolation many times. In brief, it’s about separating the source of signal from the microcontroler in order to prevent it from unwanted and dangerous voltage spikes, while allowing to read the signal. Such a separation is provided by optocouplers. The optocoupler contains in common package both infrared […]

I2C in a slightly different way

In Arduino IDE there is Wire library available, supporting I2C protocol (you can read about it on Arduino pages, in irreplaceable Playground section). Todd Kurt wrote on his blog that he will make the code of a new library for I2C – SoftI2CMaster accesible through various projects related to BlinkM. How it differs from Wire? […]

Arduino Bluetooth on Ubuntu

Arduino Bluetooth – Arduino without USB port, with Bluetooth module instead. Ideal solution if wireless communication with Arduino is needed. At first – some differences to an ordinary Arduino Duemilanove. Arduino BT is based on ATmega168, so we have a little less memory at disposal. There is no USB port, so we have to power […]