STEM Resources

Mood Ring for TI-84 Plus CE OS 5.3

Mood Ring for TI-84 Plus CE OS 5.3

Author: Texas Instruments Inc.

Topic:  Computer Science, STEM

Bring science and coding together (no coding experience necessary) while developing a mood ring! The science of color mixing is explored while determining the right body temperature thresholds.

Make a Mood Ring
This project is a fun way to begin your STEM and coding journey 


Students create a system to control the color of an LED based on the temperature of their finger.

Science of Color


Feedback and Control systems

Temperature sensor input

Color LED output

Coding Concepts:


  Conditional Statements



Learn to do the project yourself

Step 1: Get a practice kit from the TI STEM Team.

Go to  Click on the  Get Started Now button. Then fill out the form to begin the conversation with the TI STEM Team.

Step 2: Do the following:

A. 10 Minutes of Code with the TI-Innovator Unit 1.

These are step-by-step instructions that will give you a foundation for creating, running and editing TI-Basic programs with the TI-Innovator Hub.

Follow this link. Click on Unit 1 and then click step by step to go through the skill builders. (Note: Units 2 and 3 are also useful)

B. Digital Mood Ring Project

We have found this to be a great first project for doing feedback and control systems.

The topic is fun and the set-up is not intimidating. You will cover foundational concepts for programming and for feedback and control systems.

After doing this project both adults and students say that the more advanced projects no longer look so overwhelming.

Make sure to download and follow the “By Challenges” Teacher document and example programs on this page.

Also, we highly recommend a set of YouTube videos that we created based on workshops with teachers preparing to lead summer camps. Follow this link.

C. You are ready to move on to more advanced projects. See the latest project list at


Contact with questions or comments about the project.


Publisher specific license