Update README.md

Author: Arduino-Projects

README.md

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 # Fullduino - My Homemade Custom Arduino Board
-A custom made Arduino board with a fully self-designed and soldered PCB. Has a lot of additional on board sensors and outputs that the normal arduino does not have, including an Accelerometer, a Gyroscope, a potentiometer, a photoresistor, an OLED display, a microphone, a buzzer, 4 LEDs, and two General Purpose Buttons. All the necessary sketching, wiring, and soldering for each of these components was done by myself.
+A custom made Arduino board with a fully self-designed and soldered PCB. Has a lot of additional on board sensors and outputs that the normal arduino does not have, including an Accelerometer, a Gyroscope, a potentiometer, a photoresistor, an OLED display, an ultrasonic sensor, a microphone, a buzzer, 4 LEDs, and two General Purpose Buttons. All the necessary sketching, wiring, and soldering for each of these components was done by myself.
 
 # Purpose
 I wasn't a big fan of the original Arduino board, with its limited ground pins and stricly female pins and almost no onboard sensors/outputs, so I decided to learn how to make my own PCB and make my own Arduino!