Simple Weather Station with NodeMCU, Arduino and ThingSpeak

SWS (Simple Weather Station)

A Simple Weather Station controlled by a NodeMCU dev board writen in Arduino which reports data through ThingSpeak.

About the ESP8266

Wikipedia:

The ESP8266 is a low-cost Wi-Fi chip with full TCP/IP stack and MCU (microcontroller unit) capability produced by Shanghai-based Chinese manufacturer, Espressif Systems.

Click here to access the full article

Main features

• Humidity and temperature measurement via DHT11.

• Atmospheric pressure and temperature via BMP180.

• Luminosity measurement with an LDR.

• Multi access point (can manage more than one SSID / password).

• OTA upload (upload new code from the Arduino IDE On The Air, just by using the wifi connection).

• Upload sensor readings to ThingSpeak.

Bill of materials

• 1 x NodeMCU V3 dev board (esp8266): ~2,65 USD.

• 1 x DHT11 sensor: ~1,00 USD.

• 1 x BMP180 sensor: ~1,70 USD.

• 2 x 10K resistors: ~0,10 USD.

Total cost: 5,45 USD.

Schematics

Since the design is really simple, you can actually mount it directly over a perfoard since there is no real need for a custom made PCB.

Parameters to be updated on the .ino file

Replace "XXXXXXX" with your API key:

const char * myWriteAPIKey = "XXXXXXX";

Add one of those statements for each SSID you want to be able to connect:

wifiMulti.addAP("SSID", "PASSWORD");

What to expect once your data has been uploaded to ThingSpeak

Link to the public ThingSpeak channel: https://thingspeak.com/channels/352849