What is it?

The analog extension adds 8 analog to digital converters based on the MCP3008 chip.

The extension offers first direct access to the 8 ADCs.

For the ADC A6 and A7 a mode with a 1k pull down resistor is available. This mean you can directly plug an light sensor for example. See the 2 2 pins female header.

For the ADC A0 and A1, 2 3 pins female header wired as follow VCC, ANALOG-PORT, GND allow to plug directly component that require VCC, ANALOG-PORT and GND like the temperature sensor TMP36 or a motion sensor. See the 2 3 pins female header.

To talk to the MCP3008 chip an SPI bus is setup using - GPIO 0 - Clock - GPIO 1 Mosi - GPIO 2 Miso - GPIO 3 Select

The Nusbio's GPIO 4,5,6,7 are available, and the SPI bus can be used to connect other SPI devices.

Tutorial: http://madeintheusb.net/TutorialAnalogConverter

Video: https://www.youtube.com/watch?v=442pCBk6Q34

Why did you make it?

ADC (Analog to digital converter) are now available out of the box with Nusbio. But are needed to communicate with analog device light or temperature sensor.

What makes it special?

The ADC (Analog to digital converter) programmable directly from .NET.