SparkFun
SparkFun Block for Intel Edison - ADC
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The Intel® Edison is an ultra-small computing platform that will change the way you look at embedded electronics. Each Edison is packed with a huge amount...
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The Intel® Edison is an ultra-small computing platform that will change the way you look at embedded electronics. Each Edison is packed with a huge amount of tech goodies into a tiny package while still providing the same robust strength of your go-to single board computer. Powered by the Intel Atom™ SoC dual-core CPU and including an integrated WiFi, Bluetooth LE, and 70-pin connector to attach a veritable slew of shield-like “Blocks” which can be stacked on top of each other. It’s no wonder how this little guy is lowering the barrier of entry on the world of electronics!
This Block adds ADC functionality to the Edison’s I2C bus. The ADS1015 ADC from TI provides a single 12-bit delta-sigma convertor with an analog multiplexer. It can be configured as a four-channel single-ended device or as a two-channel differential device.
The ADC Block has jumpers to allow selection of the I2C slave address among four different options, allowing up to four of these cards to be stacked under one Edison. The sampling rate is not sufficient for audio capture, at 2.2kHz, but it should be adequate for most control applications. This version also has a 3.3V output (now with less noise on the line) to use as a voltage reference and a solder jumper to select between I2C1 and I2C6.
If you are looking to add a little more stability to your Intel Edison stack, check out this Hardware Pack. It will provide you with increased mechanical strength for stacking Blocks on your Edison!
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- multiplexer
- A multiplexer is a chip or board that lets one controller switch between several devices that would otherwise conflict on the same bus. It matters here because multiple modules with the same I2C address cannot normally share one I2C bus without extra hardware.
- Shield
- An add-on board that plugs into a main controller board to give it extra features such as sensing, motor control or communication. Knowing a product supports shields helps you judge whether it can connect neatly into an existing maker-board setup.
- solder jumper
- A solder jumper is a small pair or group of pads on a circuit board that can be bridged or cut with solder to change a hardware setting. It matters because changing modes may require careful soldering rather than just changing software.
- voltage reference
- A stable voltage the ADC compares inputs against when converting them to numbers. A more stable reference helps produce more consistent measurements, especially in precision sensing and instrumentation.
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