Collaborizm NodeMCU Temperature Sensor Gadget

Highlights

• Made for NodeMCU (ESP8266)
• Configures WiFi authentication using a provisional configuration portal using EasyNTP library.
• Updates a DS1307 RTC by fetching Internet Time from Network Time Protocol
• Measures temperature using an LM35
• Displays time and temperature on a 16x2 I2C Lcd
• Serial debug output at 9600 baud

Pin Connections

See breadboard prototype image.

• NodeMCU V3 - Chinese clone
  • D2 = I2C SDA
  • D1 = I2C SCL
  • A0 = Analog input
  • VV = USB voltage output (+5V)
  • G = Common GND
• DS1307 (I2C)
  • Vcc = +5V
  • Gnd = Common GND
  • SDA = NodeMCU D2
  • SCL = NodeMCU D1
• 16x2 Lcd with I2C "Backpack"
  • Vcc = +5V
  • GND = Common GND
  • SDA = NodeMCU D2
  • SCL = NodeMCU D1
• LM35 Temperature Sensor
  • Vs = +3.3V
  • Vout = NodeMCU A0
  • GND = Common GND