Datasheet

Serial Protocol
All communication is at 9600 baud 8N1. Commands are a single letter with no
terminating character or line feed required. Any extraneous command characters
are ignored by the board. Some commands are followed by a response from the
board within a few milliseconds. The responses are variable length and terminated
with a \n character.
Command Response
t t=23.45\n returns the temperature in degrees C as a float
c c=400\n returns the eCOS level in ppm as an int
b no response turn the buzzer on
q no response turn the buzzer off
a no response auto-mode. Use the LED display to automatically
show the current eCO2 level
m no response manual-mode. Turn off the auto mode, prior to
setting the LED display level manually
0-6 no response turn on the LED for the level indicated (0 no LEDs,
1 lowest LED, 6 highest LED). Note onlt 1 LED
can be lit at a time.
? undocumented Returns self test data, for use during
manufacturing. We reserve the right to change
this from batch to batch. Use at your own risk.
See also the Python API here: https://github.com/monkmakes/pi_aq
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