# Hardware layout #

The [STMicroelectronics 
32F769IDISCOVERY](https://www.st.com/en/evaluation-tools/32f769idiscovery.html) 
is a board which is ideal for the Tardis project, as it offers plenty of 
connectivity options and does not require soldering, making it an 
excellent target to develop on for blind people. Here is the hardware 
layout of this board. To follow along properly, please make sure the 
board is on a flat surface, with the ethernet connector facing toward 
you, and the LCD facing up.

## Front edge ##

* Ethernet connector.
* 5v external power source connector (see below).

## Left edge ##

* ST-Link programmer micro USB connector.
* USB OTG connector.

## Back edge ##
* 2x RCA connectors:
	* RCA RX.
	* RCA TX.

## Right edge ##

* 3.5mm jack line out connector.
* 3.5mm jack line in connector.
* Micro SD card slot.

## Top side ##

* 2x tactile buttons.
	* Reset button near the ethernet connector.
	* User button near the RCA connectors.
* LCD touchscreen panel.
* WiFi module connector (ESP8266) near the user button.
* 4x MEMS microphones left of the LCD panel.

## Under side ##

* Arduino compatible connector
* Jumpers to select power source:
	* 5v USB charger.
	* 5v power over ethernet (PoE).
	* 5v external power.
	* USB OTG.
	* ST-Link (default).

## How to use the external power ##

Caution: documenting this connector for completeness sake, but we 
would highly advise against using it, as it appears to be no standard 
barrel jack connector. Rather it is a special connector designed to take 
in wires that resemble breadboard wires, which lock into place thanks to 
a lock-in made for this express purpose.

Let's reiterate that doing this with standard breadboard wires is most 
probably not a good idea.

This connector is using male pins, so if you wish to use wires, make 
sure to pick male to female wires.

With the ethernet connector still facing toward you, the pins of this 
connector are as followed, from **left to right**:

* Ground.
* 5v power.

## WiFi module ##

If you wish to use WiFi on any project, you could use the 
[WRL-17146 WiFi module](https://www.sparkfun.com/products/17146) from 
SparkFun.