Mood Ring for TI-84 Plus CE (OS 5.3 and above)

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.

Author: Texas Instruments Inc.

Topic:  Computer Science  STEM


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



Digital Mood Ring Project Downloads

Teacher Document   PDF  link  Word doc  link

Student Document   PDF  link  Word doc  link

TI-84 Plus CE .8XP Programs in Zip File  link


Teacher Background Resources (optional)  PDF  link  Powerpoint ppt  link


Compound Inequalities Worksheet (optional)  PDF link  Word doc  link

Compound Inequalities Example Solution (optional)  PDF  link



Learn to do the project

Download Learn to do the project PDF link

View step-by-step Youtube videos link

Important Programming Concepts and Calculator Skills in the Digital Mood Ring Project link


Set up your equipment

Update your TI-84 Plus CE, TI SmartView CE emulator software and TI-Innovator sketch link

Download a tutorial on using the TI Connect CE software for program editing and transferring files to and from your calculator  PDF link  

Download a step-by-step guide to updating your TI-Innovator Hub   PDF link  


Own project equipment

Here is information for budget requests and grant proposals.

Download a PDF listing the equipment needs for each TI-Innovator Hub Project  link

See a list of TI Instructional Product Dealers and request a quote  link



See other projects at

Contact with questions or comments about the project.

Publisher specific license