Front Panel

{{@273#bkmrk-tiger-city-imx-embed}}

View of the front panel

Components of the front panel

• {{@135#bkmrk-dip-switch}}
• {{@135#bkmrk-signal-leds}}
• {{@135#bkmrk-oled-display}}
• {{@135#bkmrk-%C2%A0}}
• {{@135#bkmrk-reset-button}}

DIP switches

The device has DIP switches on the front panel which enable the control of various key functions such as:

• booting mode choice
• microUSB signal choice
• choosing Linux console or RS232 signal
• user-written code

DIP switches placement on the front panel

Switch options

Switch No.	Positions	Description
1	OFF - eMMC boot ON - USB boot	Boot select - switching between booting device
2	OFF - SOM USB ON - UART4 (Linux console)	USB select - microUSB signal choice
3	OFF - UART1<=>RS232_1 ON - UART4<=>RS232_1	RS232 - SOM UART RS232 select
4	OFF - UART3<=>RS232_2 ON - UART3<=>ESP32	RS232 - SOM UART RS232/ESP32 select
5	Unassigned	Currently not used
6-8	OFF/ON	User options

Connections diagram

{{@136#bkmrk-expander-d}}

User-defined DIP switch options are connected to the expander D which is connected to the CPU via the I2C3 interface.

{{@133#bkmrk-usb1}}

The USB MUX select 1 and the USB MUX select 2 signals are connected to the multiplexer A associated with USB1.

Signal LEDs

The device is equipped with 8 LEDs. 2 of these LEDs are placed on the mainboard, while the other 6 are on the front panel of the HMI board.

LEDs location

LEDs connections

Description	User-space name	Flags
Power LED	gpiochip6 9	"LED_5V"
CPU LED	gpiochip8gpiochip0 83	"LED_MAINBOARD"
User LED 1 G	gpiochip7gpiochip6 10	"LED3_GREEN"
User LED 1 R	gpiochip7gpiochip6 5	"LED3_RED"
User LED 1 B	gpiochip7gpiochip6 12	"LED3_BLUE"
User LED 2 G	gpiochip7gpiochip6 13	"LED4_GREEN"
User LED 2 R	gpiochip7gpiochip6 11	"LED4_RED"
User LED 2 B	gpiochip7gpiochip6 15	"LED4_BLUE"

LEDs connection diagram

{{@166#bkmrk-esp32-microcontrolle}}

ESP LED is connected directly to the ESP32 microcontroller.

{{@133#bkmrk-%C2%A0-4}}

GSM LED is connected directly to the GSM modem.

{{@133#bkmrk-%C2%A0-3}}

ETH activity LED and ETH link LED are connected directly to the ETHERNET physical layer.

{{@136#bkmrk-expander-d}}

Power LED, User LED 1 and User LED2 are connected to the expander D which is connected to the CPU via the I2C3 interface.

OLED display

The device is equipped with a 0.87” black and white display with a resolution of 128x32 px.

OLED display placement

OLED device

Part number: SCE087002-V01

OLED connections table

OLED pin	Description	User-space name
RES#	RESET	X
SCL	I2C3 clock	X
SDA	I2C3 data	X
VCC	OLED ON/OFF	gpiochip7gpiochip6 1414, "OLED_EN"

OLED connections diagram

{{@136#bkmrk-expander-d}}

The OLED display is connected to Expander D which is connected to the CPU via the I2C3 interface.

{{@134#bkmrk-i2c4}}

The OLED display is directly connected to the CPU via the I2C3 interface.

Joystick

The device is equipped with a joystick for controlling its functions.

Placement

Device

Part number: INT-1500D

Connections table

Joystick signal	Expander D pin	User-space name	Flags
Right	20	gpiochip7gpiochip6 3	"JOY_RIGHT"
Up	18	gpiochip7gpiochip6 1	"JOY_UP"
Left	17	gpiochip7gpiochip6 0	"JOY_LEFT"
Down	19	gpiochip7gpiochip6 2	"JOY_DOWN"
Push	21	gpiochip7gpiochip6 4	"JOY_PUSH"

Connection diagram

{{@136#bkmrk-expander-d}}

Joystick is connected to the Expander D which is connected to the CPU via the I2C3 interface.

Reset button

The device has a reset button on the front panel.

Reset button location

Connections diagram

{{@166#bkmrk-watchdog-%2B-reset}}

The reset button is connected directly to the reset circuit.