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Jun 12, 2019
Jul 21, 2019
Jul 21, 2019

Another_Weather_Station

Just having some fun with Arduino to build a small portable weather station.

Sensor Type Price (USD)
HTU21D Temperature & Humidity 1.44
BMP280 Barometric Pressure (and Temperature, not used) 0.83
VEML6075 UV index 3.93
PMS7003 PM 1.0, 2.5 and 10.0 (ug/m3) 13.00
CCS811 CO & TVOC (Total Volatile Organic Compounds) 8.70
SSD1306 OLED Screen 128X32 1.86

MQ131 has also been tested unsuccessfully, its sensitivity is too low for standard NO2 levels in the atmosphere.

As the code uses a lot of memory, more exactly the SSD1306 OLED in 128x64 via malloc call, buffers of the 2 following libraries have been reduced:

  • Wire.h BUFFER_LENGTH reduced from 32 to 8 bytes
  • twi.h: TWI_BUFFER_LENGTH reduced from 32 to 8 bytes

Circuit Picture

OLED Picture

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Another Arduino based Weather Station with tons of sensors!

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