NHD-FT81x-SHIELD User Guide
Rev 1.0
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www.newhavendisplay.com
(3) Reset Button
S1 is a reset button for the Arduino, not for the display. This allows access to the Arduino’s reset button which is covered
up when a shield in placed on top of the Arduino for a number of the Arduino models.
(4) Micro-SD Slot
The micro-SD socket CN1 on the NHD-FT81x-SHIELD enables the Arduino to access files for use with the FT81x Graphics
Controller, along with being a storage media for general storage used by the Arduino. The Arduino communicates to both
the Display and micro-SD card over SPI, and some of the communication from the display may request the Arduino for
information which is stored on a file on the card. The Arduino will then access the information on the micro-SD card and
send the information to the Display. The micro-SD card chip select signal is available on the Arduino’s Digital pin 5, while
the card detection signal is available on the Arduino’s Digital pin 3.
(5) Audio Connector
The audio connector JP6 is used for connecting an external 8 Ohm 1 Watt speaker.
SP+ Audio sve from the onboard amplifier.
SP- Audio speaker -ve from the onboard amplifier.
(6) Audio Amplifier Power Select
This jumper provides the option to select the power supply voltage for the onboard power amplifier.
SJ9 (5V) Audio Amplifier Power Select 5 Volts. (Solder connection fitted by default).
SJ10 (3.3V) Audio Amplifier Power Select 3.3 Volts.
(7) Audio Amplifier Mute/Enable Select
This jumper provides the option to Enable or Mute the onboard amplifier.
SJ7 (Enable) Audio Amplifier Enable (Solder connection fitted by default).
SJ8 (Mute) Audio Amplifier Mute.
The onboard amplifier circuit can also be muted by the AUDIO_SHDN# signal connected to GPIO2 on the TFT-LCD
Controller board.
