Hoppy's Sensors

  • Channel ID: 291915
  • Author: hoppyhop
  • Access: Public
Some sensor data measured with BME280 and DS18B20 and sent once a minute using ESP8266
  bme280, esp8266, ds18b20
MATLAB Analysis MATLAB Visualization

Field 4 Chart
Field 2 Chart
Field 3 Chart
External Temperatures
Field 8 Chart
Calculate Dew point and water content
Internal Temperatures
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hoppyhop almost 7 years ago
I had an ESP8266 for some reason or another. It cost about the same as a beer.
I bought a BME280 to fiddle about with, perhaps to make an altimeter with "one day". Connected it to the ESP8266 and discovered how easy it was to program using various libraries found on the internet.

Then one thing lead to another and I bought two waterproof DS18B20 sensors and poked one out of the window. The code needed to make this work added about 5 lines to the source.
The temperature over-read in the sun, so I wrapped the end in aluminium foil.

That left me with a spare sensor. So I stuck that inside a plant propagator. Because I could.

Then I realised that the ESP8266 had an analogue input pin. So I found a solar cell I've been carefully hoarding for 25 years or so, just in case, and connected it to the analogue input. That added another line or two to the source code. The graph scale for that is quite arbitrary. More light, more volts. Of course the solar cell voltage is exponentially related to the light intensity. And absolute temperature. And I have no idea what the impedance of the ESP8266 is. But that doesn't matter, it's another graph.

Many graphs - such fun - much data! Wow!

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