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3.7
TRIMPOTS
LPC2148 development board has two trimpots connected to AD0.1 and AD0.2 on the
LPC2148 microcontroller. The jumper positions are as shown in the above figure.
Jumper AN1 represents trimpot AN1 and AN2 represents trimpot AN2. The trimpot
voltage range lies between 0-3.3V.
3.8
UART1/XBEE/BLUETOOTH/WIFI
Fig.3.1
The LPC2148 development board has a provision for interfacing XBee / Bluetooth /
WiFi wireless modules. The wireless modules use UART for the communication with
microcontroller. The UART1 on LPC2148 microcontroller can be used for this purpose.
The jumper positions for the desired operation are shown in above figures. If jumper
positions are as per fig.3.1 then UART1 is selected for Xbee wireless communication. If
jumper positions are as per fig.3.2 then UART1 is selected for RS-232 serial
communication.
3.9
SPI INTERFACE
The LPC2148 microcontroller features 2 SPI interfaces i.e. SPI0 and SPI1. On LPC2148
development board SPI0 is used for interfacing SD/MMC card. The SPI expansion
NEX Robotics Pvt. Ltd.
www.nex-robotics.com
LPC2148 DEVELOPMENT BOARD
Fig.3.2
47
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