Connectivity; Functionality - Digilent Basys MX3 Reference Manual

Basys MX3™ Board Reference Manual
The output of the microphone module is an analog signal A_MIC, connected to an analog input pin of PIC32. This
analog pin must be sampled using the PIC32's ADC functionality to get a digital value. The PIC32 provides 10-bit
data ADC sampling. Read more on the PIC32's ADC functionality in the Analog-To-Digital Converter (ADC) section of
the PIC32 documentation.
The microphone on the Basys MX3 also features adjustable gain that is controlled using a thumbwheel
potentiometer labeled MIC VOLUME. This dial directly controls the gain of the A_MIC signal going into the PIC32.

18.1 Connectivity

Table 18.1 below shows the details about the A_MIC signal connecting the microphone module to the PIC32.
Name
A_MIC
The A_MIC pin will be used as analog input pin:

The corresponding TRIS bit must be set to 1:
TRISBbits.TRISB4 = 1;

The corresponding ANSEL bit should be set to 1:
ANSELBbits.ANSB4 = 1;

18.2 Functionality

The microphone usage is described through library functions in the MIC and ADC libraries of the Basys MX3 library
pack. Implementation features include:
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Figure 18.2. Microphone frequency response.
PIC32 pin
AN4/C1INB/RB4
Table 18.1. Microphone connectivity.
SPA2410LR5H-B pin
OUT
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