User Manual

4.c. Pushbuttons
The expansion PCB has designated connection points for three pushbuttons: a push-on/push-off
power button connected in parallel with the power button on the 3pi base, a general-purpose
pushbutton connected to mbed pin P21 on one side and ground on the other, and a general-purpose
pushbutton that is not connected to anything except a set of prototyping pins on each side. This last
button can be connected to an arbitrary mbed or Wixel I/O line to create a second user-interface
pushbutton.
General-purpose pushbutton on the m3pi
expansion PCB.
A ground pad is conveniently placed next to the pads connected to the right side of this general-
purpose pushbutton, which makes it easy to connect one side of the button to ground.
4.d. General-Purpose Voltage Dividers and MOSFET Circuits
Pololu m3pi User’s Guide © 2001–2017 Pololu Corporation
4. The Expansion Board in Detail Page 31 of 39