Arduino Nano

Datasheet:
Arduino Nano ATmega328 Microcontroller User Manual

Features: 16MHz Clock Frequency
Digital, Analog, PWM, UART, I2C, and SPI Capabilities
32kB Flash Memory
2kB Internal SRAM
1kB EEPROM
Ideal for Constrained Spaces

Connection:
Mini-B USB to USB Type-A

Interfacing:
Arduino IDE

Dimensions (with headers):
43.2mm x 18mm x 18.5mm

Use-Case:
Controls and processes data for all three ultrasonic sensors.