# Hardware Iterations

This is a continually updating post of our various hardware iterations. You can track the changes and see how our product progresses from breadboard to manufacturing at scale.

###### _`Updated on November 4, 2012`_

We just received our second prototype, substituting the breadboard prototype with our own PCB.

We decided to keep using the same Microchip ADK kit and only design the analog board with a flat connector. Separating the analog and digital circuits will enable us to iterate faster – for example, if we want to switch to a different microcontroller.

###### _`Updated on July 4, 2012`_

The first version of our hardware is up and running.

By this we mean that we are able to connect our board to an Android phone through USB (using the [Microchip ADK Starter’s kit](https://www.microchip.com/Developmenttools/ProductDetails/DM240415)) and sample at 40,000 samples per second, including real-time signal analysis and classification. Our goal is to reach ultrasound frequencies (~ 120 Ksps).

We are using the PIC24F microcontroller that comes with the kit and added a Texas Instruments ADC ( [Analog Digital Converter](https://en.wikipedia.org/wiki/Analog-to-digital_converter)) that should be able to reach 500 ksps. Our current bottleneck is in sampling and transmitting the data to Android. It’s a combination of the microcontroller’s abilities and the fact that Android phones only support USB full-speed.

Next up is to increase the sampling rate by tweaking the firmware and validating the analog circuits – data integrity above all.

- [See How It Works](/content/get-a-demo/index.html)