A while ago I received a couple of I/O port expander modules that use the I 2 C protocol. Using that Chinese module, you can use only the SDA and SCL pins of your Arduino, or any microcontroller ...

in my implementation steering wheel buttons use a gravity 433mhz transmitter and receiver pair for inputs, but you can easily accomplish the same with normal wired buttons ...

This IO expander plugs into an Arduino Uno to add more controllable pins. It can be used for instance to interact with TTL circuits. One configuration can be 24 bits output and 8 bit bi-directional.

Are you tired of trade-offs due to the lack of I/O ports while developing your designs with the preferred platform? Do you want more to handle your multitude of signals and actuators? This breakout ...

More and more microcontroller boards are equipped with Arduino-compatible pinheaders (for example, see the ARM Cortex Board from Infineon http://www.ehitex.de ...

Need to quickly toggle or read some logic signals without the hassle of writing a quick program? [Thor_x86], aka [Eric], built an Arduino sketch that does just that — and he threw in the ability to ...

Catalyst Semiconductor has added a 16-bit device to its family of I/O bus expander ICs. The CAT9555 comprises two 8-bit ports (16 I/O pins), which power up as inputs and can be configured as an input ...