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RobTillaart / ACD10

Arduino library for the ACD10 CO2 sensor
MIT License
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initial version #3

Closed RobTillaart closed 1 year ago

RobTillaart commented 1 year ago

remarks can be made here

fuzonmedia commented 1 year ago

Does the CO2 match the testcode you got from aosong?

17:10:00.136 -> CO2：1894PPM 17:10:02.221 -> CO2：1897PPM 17:10:04.308 -> CO2：1901PPM 17:10:06.374 -> CO2：1904PPM 17:10:08.486 -> CO2：1907PPM 17:10:10.561 -> CO2：1910PPM

RobTillaart commented 1 year ago

What happens if you breath towards the sensor? Does it peak? And slowly falls back?

fuzonmedia commented 1 year ago

17:11:22.785 -> 1805 12048 17:11:24.868 -> 1801 12048 17:11:26.982 -> 1798 12045 17:11:29.058 -> 1795 12047 17:11:31.168 -> 1792 12051 17:11:33.262 -> 1789 12053 17:11:35.335 -> 1786 12050 17:11:37.430 -> 1783 12054 17:11:39.537 -> 1780 12054 17:11:41.616 -> 1777 12056 17:11:43.729 -> 1774 12059 17:11:45.786 -> 1771 12058 17:11:47.913 -> 1769 12056 17:11:49.992 -> 1767 12054 17:11:52.101 -> 1763 12056 17:11:54.172 -> 1761 12057 17:11:56.251 -> 1759 12063 17:11:58.366 -> 1757 12059 17:12:00.451 -> 1756 12061 17:12:02.546 -> 1755 12061 17:12:04.698 -> 1754 12063 17:12:13.129 -> CO2：1751PPM 17:12:15.218 -> CO2：1750PPM 17:12:17.286 -> CO2：1749PPM 17:12:19.382 -> CO2：1749PPM 17:12:21.479 -> CO2：1748PPM 17:12:23.561 -> CO2：1747PPM 17:12:25.619 -> CO2：1747PPM 17:12:27.716 -> CO2：1747PPM 17:12:29.795 -> CO2：1746PPM 17:12:31.879 -> CO2：1746PPM 17:12:33.968 -> CO2：1746PPM 17:12:36.063 -> CO2：1745PPM 17:12:38.139 -> CO2：1745PPM 17:12:40.234 -> CO2：1745PPM 17:12:42.375 -> CO2：1745PPM 17:12:44.378 -> CO2：1744PPM

First few from this code last few from ASAIR

RobTillaart commented 1 year ago

Ok that confirms the Concentration CO2 is working.

What is the current temperature in the room?

fuzonmedia commented 1 year ago

Ok that confirms the Concentration CO2 is working.

What is the current temperature in the room?

~27 C

RobTillaart commented 1 year ago

So we have a bit pattern value ~12000 that should represent 27. Assuming it is the outside temperature and that the raw bit pattern has scale Celsius.

Dividing by 512 gives a temp in the right order of magnitude.

RobTillaart commented 1 year ago

Dividing 12000 by 27 gives a factor 444 which is a non expected number (powers of two are).

RobTillaart commented 1 year ago

It could be that the bit pattern 12000 also include status bits so not all bits are temperature. The datasheet does not tell (or I missed it).

RobTillaart commented 1 year ago

As I don't have appropriate documentation the temperature mapping will remain unsolved. If you can provide a table with 10 or more raw measurements at (substantial) different real temperatures (e.g. measured with a DS18B20) the mapping from raw to real can possibly resolved. The derived formula / mapping should be confirmed with at least two other ACD10 sensors.

In short getTemperature() will return raw temperature and we cannot convert it to Celsius (or F or K)

RobTillaart commented 1 year ago

As there are no questions anymore I close this issue.