Board Recovery; Connector Pinouts; J1 Lcd Connector; J3 Wake Up Signals/External Relay Commands - Arduino AKX00034 Product Reference Manual

4.6 Board Recovery

All Arduino® boards have a built-in bootloader which allows flashing the board via USB. In case a sketch locks up
the processor and the board is not reachable anymore via USB it is possible to enter bootloader mode by double-
tapping the reset button right after power up.

5 Connector Pinouts

5.1 J1 LCD Connector

Pin Function
1 PWM
2 Power On
3 +5V LCD
4 LCD RS
5 Contrast
6 LCD RW
7 LED+
8 LCD EN
10 LCD D4
12 LCD D5
14 LCD D6
16 LCD D7
9,11,13,15 GND

5.2 J3 Wake up signals/External Relay Commands

Pin Function
1,3,5,7,9 V BAT
2,4,6,8,10,12 Input
13 Output
14 Output
17 Bidir
18 Bidir
15,16 GND
16 / 25
Type Description
Power Backlight LED Cathode (PWM control)
Digital Button input
Power LCD power supply
Digital LCD RS signal
Analog LCD Contrast control
Digital LCD Read/Write signal
Power Backlight LED Anode
Digital LCD Enable signal
Digital LCD D4 signal
Digital LCD D5 signal
Digital LCD D6 signal
Digital LCD D7 signal
Power Ground
Type Description
Power Gated voltage battery for wake up signal reference
Digital Edge sensitive wake up signals
Digital External solid state relay clock signal 1
Digital External solid state relay clock signal 2
Digital External solid state relay data signal 1
Digital External solid state relay data signal 2
Power Ground
Arduino® Edge Control
Arduino® Edge Control
Modified: 17/12/2021