MSP430 & HC-SR04 Ultrasonic Sensor

In this instructable, we'll see how to operate the HC-SR04 Ultrasonic Distance Sensor with the MSP430G2553 micrcontroller (MSP430G2ET Launchpad).

Supplies

MSP430 Launchpad, HC-SR04 Ultrasonic Sensor, One 220 Ohm, one 470 Ohm resistor. Breadboard, jumper cables, code composer studio.

Step 1: Circuit Setup

For our code to run properly, we'll do the connections as seen in the picture:

Sensor Vcc --> 5V on the MSP430 Launchpad

Sensor Ground --> GND on the MSP430 Launchpad

Sensor Trigger --> P1.6 on the MSP430 Launchpad

Sensor Echo --> P2.1 on the MSP430 Launchpad (over the voltage divider circuit seen in the picture)

The voltage divider is necessary to reduce the 5V voltage level coming from the Echo pin of the sensor to 3.3 V levels for the launchpad.

Step 2: C Code (Code Composer Studio)

For getting the distance from the sensor and showing them on the terminal window, you can use the code provided in the link below:

https://github.com/selimg76/microcontroller/blob/m...

Make sure that you choose the correct COM port your Launchpad is connected to from the Device Manager and set your baud rate to 19200 in the terminal you're using (either external : i.e. Putty or the built in terminal of the CCS)

The Video link provided includes a detailed explanation of the timers in MSP430 as well, so if you're interested, don't miss those sections to understand timers and how PWM and capturing is done with the module.

(If you want to see other MSP430 related Tutorials and Examples, you can take a look at this video playlist of mine.)

If you like the content please subscribe to my YouTube channel for similar tutorials and projects.

https://www.youtube.com/c/drselim

Thank you for your time and see you in another instructable.