4DISCOVERY-50W datasheet(14/43 Pages) 4DSYSTEMS

14 / 43 page

Wall Mountable Display Solution

4Discovery-50

Page 14 of 43

www.4dsystems.com.au

When using an external antenna, there is a slot cut-

out to the top-right of the PORT2 RJ45 on the back of

the 4Discovery. This slot enables a u.FL cable to exit

next to the RJ45 port, for connection to an external

cable. A suitable cable would be a u.FL to SMA cable

(not included), and enables many common external

antennas to be connected easily, with various

mounting options and signal strengths. These types

of cables are available online from many outlets and

come in a range of lengths.

The 4Discovery comes preloaded with 4D written

firmware in the ESP32, allowing the Diablo16

processor easy direct access to the functions of the

ESP32 without having to learn longhand AT

commands.

The ESP32 can be reprogrammed by the user by

utilising a header found under the back cover. An

external programmer is required, or the ESP32 can be

updated OTA (Over The Air). Please discuss with our

Support Team if you require this functionality.

Additionally, the Diablo processor and its uSD

content can be programmed/updated OTA via the

ESP32 WiFi, provided the application written into the

Diablo contains the appropriate functionality to ready

itself for OTA Updates. Please discuss with our

Support Team if you require information about this

functionality.

For full information on the ESP32 PICO D4, please

refer to the Espressif website and documentation.

The ESP32 is connected to a UART on the Diablo16

processor. These are GPIO PA5 and PA6 of Diablo16.

Please refer to the schematic diagram for more

detail.

7.6. Proximity Sensor

The 4Discovery is fitted with a forward-facing

Proximity Sensor, which is located under the glass of

the top edge of the display.

The proximity sensor used is a Vishay VCNL4200, and

communicates with the Diablo16 processor over an

I2C bus. Example code is available.

The proximity sensor is useful for power saving, and

display saving features, and can trigger the module to

wake from sleep or turn the display on if turned off.

It can also be used to detect various ambient levels,

so the backlight can be adjusted accordingly.

The Proximity Sensor uses the following GPIO on the

Diablo16 processor

PA7 - Prox INT (I2C) – Proximity Sensor I2C

PA8 - Prox SDA (I2C) – Proximity Sensor I2C

PA9 - Prox SCL (I2C) – Proximity Sensor I2C

The proximity has many registers which can be

adjusted to suit the environment the 4Discovery is

mounted in, and these can be programmatically

changed in the User application.

For more information on the Proximity Sensor, please

refer to the Vishay website and documentation.

A sample application is available in Workshop4,

outlining the code required to operate the proximity

sensor.

7.7. SPI Flash Memory (Optional)

By default, the 4Discovery does not come with SPI

Flash Memory loaded, however it is an option which

can be ordered direct from 4D Systems. Please

contact our Sales Team.

SPI Flash memory allows some multimedia (images,

animations, text, etc) to be loaded without the need

for a microSD card. This solution can be beneficial for

Users who do not wish to have installations

dependant on a microSD card, or wish to use the card

for other purposes.

SPI Flash memory also allows Users to store

Applications, to allow programs to be changed during

run time. The flash memory can also be updated

during runtime, either from the application itself

(such as variable storage) or from the microSD card

(such as a program update) or even via WiFi, if a

suitable application is written for OTA type updates.

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