AGP30, issues with CO2 VOC sensor

[Winfield Hill]

Has anyone here used the Sensirion AGP30,
a tiny I2C sensor for CO2 and VOC gases?
It takes about 60mA to heat a hot plate,
and it needs at least 15 seconds to start
reading data. But ours is experiencing
shutoffs after 1.8 seconds when we run it
from a Feather, but not if we run it from
a Raspberry Pi. Both controllers feed the
PCB with 3.3 volts, where its regulated
down to 1.8 volts with an TPS71718. We
communicate with the IC fine in both cases,
and get the readings, but they're wrong if
the hot-plate won't stay on for 15-seconds.


--
Thanks,
- Win

 

[Winfield Hill]

Winfield Hill wrote...

Has anyone here used the Sensirion AGP30,
a tiny I2C sensor for CO2 and VOC gases?
It takes about 60mA to heat a hot plate,
and it needs at least 15 seconds to start
reading data. But ours is experiencing
shutoffs after 1.8 seconds when we run it
from a Feather, but not if we run it from
a Raspberry Pi. Both controllers feed the
PCB with 3.3 volts, where its regulated
down to 1.8 volts with an TPS71718. We
communicate with the IC fine in both cases,
and get the readings, but they're wrong if
the hot-plate won't stay on for 15-seconds.

OK, nevermind, we figured it out, the sensor
was OK. We've been flashing a bright LED
every 5 seconds, as a heartbeat, visible in
sunlight, and this was resetting the sensor.


--
Thanks,
- Win

 

[Klaus Kragelund]

Also, note that you need a baseline calibration in clean air, or it cannot detect “dirty” air

Cheers

Klaus