How to Connect a DS3231 to NodeMCU V3

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To connect a DS3231 RTC module to an ESP8266-based NodeMCU V3 development board, we use the I2C interface. The default I2C interface pins of NodeMCU V3 board are the pins D1 (SCL) and D2 (SDA).

You may consult the article NodeMCU V3 Pinout and Configuration to verify the pin layout of a NodeMCU V3 development board.

Image showing connection of ds3231 to a nodemcu v3 development board
DS3231 RTC Module Connected to NodeMCU V3 ESP8266 Board
Zoomed view of the connection between ds3231 rtc module to a nodemcu v3 development board
DS3231 RTC Module Connected to NodeMCU V3 ESP8266 Board (Zoom View)

Programming with Arduino IDE

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References on How to Connect a DS3231 to NodeMCU V3

NodeMCU on Wikipedia
Maxim DS3231 RTC

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