WeMos D1 Mini Pro DS18B20 Shield Guide

Quick answer

The WeMos D1 Mini Pro DS18B20 Temperature Sensor Shield lets you add accurate, one-wire temperature sensing to your IoT projects with minimal wiring. This guide walks you through setup, code, and common mistakes.

Setup steps

1. Attach the shield to your WeMos D1 Mini Pro: Align the shield's pins with the D1 Mini Pro's GPIO headers and press firmly until seated. The shield should fit snugly without forcing. Check that the shield is fully seated; a partial connection can cause intermittent sensor readings.
2. Connect the DS18B20 sensor to the shield: The shield has a 3-pin connector for the sensor. Plug the sensor's data, VCC, and GND pins into the corresponding terminals. The shield typically uses a 4P4C connector; match the sensor's pinout. DS18B20 sensors often come with Dupont connectors; ensure the pins align correctly before crimping.
3. Install the required library in the Arduino IDE: Open the Arduino IDE, go to Tools > Manage Libraries, search for 'OneWire' and 'DallasTemperature', and install both. These libraries handle the one-wire communication protocol. Using the wrong library version can cause compile errors; stick to the latest stable releases.
4. Upload a basic temperature-reading sketch: Use the example sketch from the DallasTemperature library. It initializes the one-wire bus and reads the temperature in Celsius. Set the serial monitor baud rate to 115200 to see the output. If you see -127°C, the sensor is not detected. Check the wiring and library version.
5. Interpret the serial output: The sketch prints the temperature every second. Verify that the readings are consistent and close to a known reference (e.g., room temperature). If readings fluctuate wildly, the sensor may be too close to a heat source or the shield's connection is loose. For accurate readings, allow the sensor to stabilize for a few minutes after power-on.

Product facts

• WeMos D1 Mini Pro DS18B20 Temperature Sensor Shield: WeMos D1 Mini Pro DS18B20 Temperature Sensor Shield It provides a plug-and-play interface for the DS18B20 sensor, so you can focus on code and data logging rather than wiring.