With this shield with the DS18B20 sensor the D1-Mini can be expanded to include a measurement option for temperature. • I2C interface • Supply voltage: 3.3 - 5 V • Temperature measurement range: -55 - 125°C • Temperature accuracy: ± 0.5°C at -10 - + 85°C Pin assignment • 5 V: 5-V power supply • D2: One Wire Bus • GND: Earth Note Delivery includes 6 pin headers (2 x 8 pin male - male, male - female, male long pin - female)