10
ODROID C1 USER MANUAL
Ethernet RJ-45 jack
The standard RJ45 Ethernet port for LAN connection supports
10/100/1000 Mbps speed. The green LED Flashes when there is 100
Mbps connectivity, and the yellow LED Flashes when there is 1000
Mbps connectivity.
Infrared (IR) receiver
This is a remote control receiver module that can accept stan-
dard 37.9Khz carrier frequency based wireless data in NEC format.
MicroUSB OTG port
You can use the standard microUSB connector with Linux gad-
get drivers on your host PC, which means that the resources in the
ODROID-C1 can be shared with other PCs. You can also add a mi-
croUSB to HOST connector if you need an additional USB host port.
This port can also be used for power input with the modification de-
scribed earlier in this chapter.
General Purpose Input and Output (GPIO) ports
These 40pin GPIO port can be used as GPIO/I2C/SPI/UART/
ADC for electronics and robotics. The 40 GPIO pins on an ODROID-C1
are a great way to interface with physical devices like buttons and
LEDs using a lightweight Linux controller.
If you’re a C/C++ or Python developer, there’s a useful library
called WiringPi that handles interfacing with the pins. We’ve already
ported the WiringPi v2 library to ODROID-C1, as described in Chapter
4. Note that all of the GPIO ports are 3.3Volt, and the ADC inputs are
limited to 1.8Volt.
Serial console port
Connecting to a PC gives access to the Linux console. You can
monitor the boot process, or to log in to the C1 to perform root main-
tenance. Note that this serial UART uses a 3.3 volt interface, and it is
recommended to use the USB-UART module kit available from Hard-
kernel. A Molex 5268-04a (2.5mm pitch) is mounted on the PCB, and
its mate is Molex 50-37-5043 Wire-to-Board Crimp Housing.
RTC (Real Time Clock) backup battery connector
If you want to add a RTC functions for logging or keeping time
when offline, just connect a Lithium coin backup battery (CR2032 or
equivalent). All of the RTC circuits are included on the ODROID-C1 by
default. It connects with a Molex 53398-0271 1.25mm pitch Header,
Surface Mount, Vertical type (Mate with Molex 51021-0200).
Chapter 1
