Arduino Temperature Sensor

This project is a temperature sensor that can visually alert the user when the temperature gets outside of a specific range.

Disclaimer

I am fairly new to Arduino and C++ programming (although I am a programmer), so the code here is liable not to be best practice (or even good), but I'm learning as I go, so it should get better.

Schematic

PDF of schematic

Parts List

• 1 x Arduino Nano Every [A1]
• 1 x GND-5021BS [U1]
• 1 x 61 x WS2812 RGB LED Ring Lamp [NOT CURRENTLY SHOWN]
• 1 x SPST Momentary switch [SW2]
• 1 x 10K Variable resistor with switch [SW1] [RV1]
• 8 x 470R resistors [R1 - R8]
• 1 x 10K NTC Thermistor bead [TH1]
• 1 x 10K resistor [R9]

Operation

• [SW1] is used to switch the device on or off
• [RV1] is used to control the brightness of the LED ring
• [TH1] is used to provide the current temperature and is used with [R9] to work like a variable resistor
• [R1 - R8] are used as current-limiting resistors to protect the seven segment displays
• [U1] is a dual seven segment display but only uses 10 pins as it has digit selector pins and is used to display the current temperature for 3 seconds when [SW2] is pressed
• [A1] is the heart of the system and drives everything else
• [NOT CURRENTLY SHOWN] The LED ring is used underneath a diffuser to light up under certain configurations
  • White LEDs are always on to provide a night light function
  • Blue LEDs flash when the temperature is below 14°C to indicate it is very cold
  • Blue LEDs on permanently when temperature is between 14°C and 16°C to indicate it is cold
  • Red LEDs on permanently when temperature is between 20°C and 22°C to indicate it is hot
  • Red LEDs flash when the temperature is above 22°C to indicate it is very hot