User Manual

m3pi serial and reset connections to the 3pi robot base.
Note: You should not use these jumpers if your m3pi robot has a socketed mbed.
The m3pi expansion PCB also connects mbed pins P27 and P28 to the serial TX and RX pins,
respectively, of the Wixel and XBee sockets, and it connects mbed pin P26 to the Wixel and XBee
socket reset lines (driving P26 low resets the wireless devices). This means that the mbed NXP
LPC1768 [https://www.pololu.com/product/2150] can use one UART to send and receive wireless data
while using a second UART to control the 3pi base. (The mbed NXP LPC11U24 [https://www.pololu.com/
product/2154] only has one UART and cannot interface with a wireless module while controlling the 3pi.)
Pololu m3pi User’s Guide © 2001–2017 Pololu Corporation
4. The Expansion Board in Detail Page 26 of 39