Sensors

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Airboxlab SA edited this page Jul 28, 2015 · 1 revision

These are the sensors used in Airboxlab v2

Air quality sensors

VOC (volatile organic compounds) using iAQengine on the sensor board
PM (particulate matter) using GP2Y1010au0f (GP2Y for short)
CO2 using MQ-135 via an ATtiny on the sensor board
TMP (temperature) using CC2D23
HUM (humidity) using CC2D23

VOC, CO2, TMP and HUM are read via I2C, PM is directly driven and read from the MCU.

Other sensors

orientation using MMA8453Q
charging finished using the DONE output from CN3065
VBAT using ADC1 of the MCU
VRAW using ADC0 of the MCU

The orientation is read via I2C, the others are direct inputs on the MCU.

PM sensor use

VCC is measured to be precisely 5.0V.

Orientation

Besides the normal read mode, we have access to the interrupts pins of the accelerometer.

INT1 is connected to PB4 (PCINT4).
INT2 is connected to PC6, which does not have interrupt capabilities, but it can be used by polling to get movement info that is not time-critical.