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DAC+ connects to the 40-pin GPIO header of Raspberry Pi 1 Model B+
which we've found is the best all-around gauge
768 KHz crystal for clock generation & RTC
Full size HDMI
You can use all of the connectors on the edges of the Pi: HDMI
SGP30 Air Quality Sensor Breakout 5A DAC+ connects to the 40-pinMeasure indoor air qualitytotal volatile organic compounds (TVOC) and equivalent CO2 (eCO2)with this digital sensor for Raspberry Pi and Arduino. The SGP30 sensor measures two different types of gases: volatile organic compounds (like hydrocarbons) and equivalent carbon dioxide (H2 level is used as a proxy for this). The sensor does some nifty real time baseline compensation to give you the most accurate readings, with just a 10 15% margin of error
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