ESP8266 NodeMCU Sensors API

Basic example how to output sensor readings as a JSON API using an ESP8266 NodeMCU module and some sensors.

Hardware

Everything on the picture below was bought on ebay for about $10 in total.

Sensors

• BME280 (temperature, pressure, humidity)
• TMP102 (temperature; but more accurate than the BME280)
• TSL2561 (illuminance; full spectrum, ir spectrum & visible spectrum)

Output

When browsing to the IP of the module you will see a similar output as below.

{
  "illuminance": {
    "visible": 905.0,
    "full": 1255.0,
    "ir": 347.0
  },
  "temperature": 24.51,
  "humidity": 37.49,
  "pressure": 1027.82
}