User Manual

RN131/171 EVALUATION KIT
USER’S GUIDE
 2013 Microchip Technology Inc. DS50002183A-page 29
Chapter 3. Application Design Concerns
3.1 INTRODUCTION
This section provides the design concerns related to powering the evaluation board,
sensor interface settings, Ad hoc mode and restoring factory settings.
3.1.1 Powering the Module
The RN131/RN171 Evaluation Board is powered using the USB cable or through the
battery pack, which holds two AAA batteries. However, RN131 Evaluation Board can
also be powered using air-wiring.
3.1.2 Sensor Interfaces
The input voltage on the sensor inputs must not exceed 1.2V. The Analog-to-Digital
Converter (ADC) saturates at 400 mV. It is recommended to use the sensor power out-
put to drive any analog devices that are attached to the sensor pins.
3.1.3 GPIO9 Functions
The AP push button is connected to GPIO9. Depending on the state of GPIO9, the module
enters into three different modes: AP mode, Factory reset and WPS mode.
3.1.3.1 AP MODE
To put the module into AP mode, GPIO9 must be high when the module powers up or
wakes from a sleep state. Press the AP mode button to drive GPIO9 high, and then
press the RESET button to reset the module. The module is in default AP mode, which
creates a default access point network with the default parameters as listed in
Tabl e 3-1 .
TABLE 3-1: DEFAULT AP MODE SETTINGS
Note: The RN171 module can also be powered through the USB cable while a
battery pack is installed.
Note: Sensor pins 2 and 3 have a resistor network in front of sensors 4 and 5,
respectively. Hence, these pins can be driven with up to 3.3V DC.
Note: This default mode overwrites any software settings.
Setting AP Mode Default
SSID WiFlyAP-XX, where XX is the last two bytes of the module’s MAC
address
Channel 1
DHCP Server Enabled
IP Address 1.2.3.4
Netmask 255.255.255.0
Gateway 1.2.3.4