10) Battery Low LED
The battery low LED indicates when the batteries need changing. The LED blinks
occasionally as the voltage level nears the end of its capacity, lights solidly with 5-10
minutes runtime left. Timing will vary depending on the battery type and current
demands. The battery low LED may flash briefly when power is first connected, this is
normal and can be ignored.
The battery low signal is also available at one of the so you could monitor for this
condition and reduce current demands for the last stages of battle, or send a message
over WiFi to the robot operator.
11) Reset Button
The reset button at the bottom-right corner of the PCB holds the Propeller FLiP
microcontroller in reset whilst pressed. When multiple robots are about to battle, it can
be convenient for both teams to hold the reset buttons, and release them when it’s
time to start the robots! This button resets the Propeller microcontroller without
affecting power to the rest of the board. The Propeller microcontroller can also be reset
using the small RESET button located under the top edge of the FLiP module.
12) Power Switch with LEDs
The power switch in position 0 disconnects the input power supply from the entire
SumoBot WX board AND holds the Propeller FLiP in reset if it has an external power
source connected to its USB port. Position 1 enables everything except power to the
servo ports. Position 2 also enables power to the servo ports.
Two green power LEDs indicate when the switch is in Position 1 (1 on) or 2 (both on).
13) Anchor Holes
There are seven unplated anchor holes around the PCB, useful for mounting additional
hardware or securing servo and sensor cables with cable ties.
14) MEMSIC MX2125 Header
The MX2125 designated pads are located under the FLiP module socket, and accept the
MEMSIC 2125 Dual-axis Accelerometer (#28017).
Propeller I/O pins P21 and P22 connect to the MX2125 socket via 240-ohm series
resistors. These connections could be used as general purpose I/O’s instead of the
accelerometer function.
Copyright © Parallax Inc.
SumoBot WX Board (#32132)
v1.1 8/17/2020 Page 5 of 9