LilyPad Temperature Sensor

Give your wearable projects the ability to feel the heat (or cold)! The LilyPad Temperature Sensor is a sewable breakout board featuring a built-in MCP9700 thermistor that lets you easily detect temperature changes in your environment or track body heat when pressed against the wearer. Instead of complicated digital communication, this sensor outputs an analogue voltage that scales linearly with temperature (0.5V at 0°C, shifting 10mV per °C). Just read the voltage flowing through the signal tab using an analogue pin on your LilyPad Arduino, and you can easily convert the data into usable Celsius or Fahrenheit readings.

The LilyPad Temperature Sensor is capable of sensing a wide range of temperatures from -40°C all the way up to 125°C with an accuracy of ±2°C.

Sewable E-Textile Design

LilyPad is a wearable e-textile technology developed by Leah Buechley and cooperatively designed by Leah and SparkFun. To ensure these components integrate seamlessly into your wardrobe (no pun intended), LilyPad relies on some specific hardware choices:

• Sewable Tabs: The LilyPad Temperature Sensor features three large conductive connection pads that let you stitch it directly into fabric with conductive thread.
• Low-Profile Build: Measuring just 20mm in outer diameter on a thin 0.8mm PCB, this board lays perfectly flat against your garments.
• Washable Hardware: Built to withstand real-world use, your finished clothing can be washed without damaging the electronics.

Adding this analogue sensor to your e-textile toolkit gives you a straightforward way to program clothing that reacts directly to ambient weather, body heat, or physical touch.

• Schematic
• Eagle Files
• Hookup Guide
• Datasheet (MCP9700T-E/TT)
• Learn More About LilyPad
• E-Sewing Basics
• Tutorials:
  • Getting Started with LilyPad
  • Planning a Wearable Electronics Project
  • Insulation Techniques for e-Textiles
• GitHub Hardware Repo