Mood Ring Thermometer¶
The SHT40 sensor paired with a low-cost round GC9A01 "smartwatch" display that changes color with the temperature.
Source book: Learning MicroPython
Kit page: https://dmccreary.github.io/learning-micropython/kits/sht40-temp-display/
Printable one-pager: sht40-temp-display-one-pager.html
Features¶
- Wire a sensor and a round color screen to a Raspberry Pi Pico.
- Test each part on its own before you put them together.
- Explain what a pixel is and how x and y numbers find a spot on the screen.
- Change a temperature from Celsius to Fahrenheit.
- Read a short program and explain how it picks a color.
- Change a setting and predict what the display will show.
Benefits¶
- Free, open lessons: the Learning MicroPython textbook has the kit page, wiring, and MicroPython code.
- Classroom friendly: built on a solderless breadboard or no-solder connectors.
- Wireless-ready: the Pico W option adds Wi-Fi for time sync and web projects.
- Instant feedback: students see their code's results on lights or a display.
- Real-world data: students read sensors and turn measurements into decisions.
- Budget: about $9 (sum of the listed parts: Pico $4, SHT40 $1.65, GC9A01 display $3.19).
Parts¶
- Raspberry Pi Pico ($4) — Microcontroller
- GC9A01 Round TFT ($3.19) — Display
- Momentary Push Buttons — Input button / switch
- SHT40 — Sensor
- 830-Point Breadboard ($1.10) — Breadboard
- Micro-USB Data Cable ($2.50) — Power and programming cable