PWM: 5, 6. Provide 8-bit PWM output with the analogWrite() function.
SPI: on the ICSP header. These pins support SPI communication using the SPI
library. Note that the SPI pins are not connected to any of the digital I/O pins as they
are on the Uno, They are only available on the ICSP connector. The SPI pins are
also connected to the AR9331 gpio pins, where it has been implemented in software
the SPI interface. This means that the ATMega32u4 and the AR9331 can also
communicate using the SPI protocol.
LED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH
value, the LED is on, when the pin is LOW, it's off. There are several other status
LEDs on the Industrial 101, indicating power (PWR), WLAN connection, WAN
connection,TX and RX.
Analog Inputs: A0 - A3 and A7 (on digital pins 6). The Industrial 101 has 4 analog
inputs, labeled A0 through A3, all of which can also be used as digital i/o; and A7 is
on digital i/o pin 6. Each analog input provide 10 bits of resolution (i.e. 1024 different
values). By default the analog inputs measure from ground to 5 volts, though is it
possible to change the upper end of their range using the AREF pin and the
analogReference() function.
AREF. Reference voltage for the analog inputs. Used with analogReference().
There are 4 reset buttons with different functions on the board:
101 RST: reset the AR9331 microprocessor. Resetting the AR9331 will cause the
reboot of the linux system. All the data stored in RAM will be lost and all the
programs that are running will be terminated.
32U4 RST: reset the ATmega32U4 microcontroller. Typically used to add a reset
button to shields which block the one on the board.
USER1: connected to GP20 MIPS side and used to reset Wlan.This button has a double feature.
Primarly serves to restore the WiFi to the factory configuration. The factory configuration consist to
put the WiFi of the Industrial 101 in access point mode (AP) and assign to it the default IP address
that is 192.168.240.1, in this condition you can connect with your computer to the a WiFi network
that appear with the SSID name "Arduino-Ind-101-XXXXXXXXXXXX", where the twelve 'X' are the
MAC address of your Industrial 101. Once connected you can reach the web panel of the Industrial
101 with a browser at the 192.168.240.1 or "http://arduino.local" address. Note that restoring the
WiFi configuration will cause the reboot of the linux environment. To restore your WiFi configuration
you have to press and hold the WLAN RST button for more 5 seconds but less 10 second. When you
press the button the WLAN blue LED will start to blink and will keep still blinking when you release
the button after 5 seconds indicating that the WiFi restore procedure has been recorded. The second
function of the USER1 button is to restore the linux image to the default factory image. To restore
the linux environment you must press the button for 30 seconds. Note that restoring the factory
image make you lose all the files saved and softwares installed on the on-board flash memory
connected to the AR9331.
USER2: connected GP23 MIPS side and available to the user.
