AoA-Device

An embedded systems project to tackle the real-world problem of the high computational power requirement of AoA (Angle of Arrival) devices using the TM123GH6PM microcontroller under low power and low cost.

Hardware Components

Components	Qty
TM123GH6PM Tiva Board	1
LM2902 Op-amp	1
CMC-9745-44P Mic	4
2.2kΩ resistor	4
1kΩ resistor	4
10kΩ resistor	4
100kΩ resistor	4
0.1μF capacitor	2
1μF capacitor	4
10μF capacitor	1

Circuit Diagram

Each microphone utilizes this circuit

Peripherals Used

Peripherals used
ADC0 (Sequence Sampler)
ADC1 (Digital Comparator)
Timers
NVIC
DMA
UART

Software Features

Using UART, these commands can be given as input to the microcontroller.

• reset: This command sends a request to the M4F board to reset the hardware. The reset request is performed via NVIC_APINT_SYSRESREQ
• average: Displays an average value of each microphone in DAC units.
• level: Sets the threshold detection range for the digital comparator.
• aoa: Displays the most current value of the Angle of Arrival of an event.
• aoa always: Displays the Angle of Arrival every time an event is detected.
• tdoa: Displays the Time Difference of Arrival information of the mics for an event.