4 ms·
you can do so, and properly calibrate it, and cross check it with some "known good" sensor you lend yourself from a friend and make sure you get the heat sensit
by dathinab 4y ago
you can do so, and properly calibrate it, and cross check it with some "known good" sensor you lend yourself from a friend and make sure you get the heat sensitivity of sensor and stuff like that right etc.
most people can't, or more precise they probably can put something together but can't make sure it works correctly under any situation (in operation range)
what you pay for is that someone makes sure it works properly
else you can get sensors with similar or same hardware on amazon too, it's just that their correct reliability is not guaranteed at all and just checking if the values outside seem right is by far not enough to verify that (because it e.g. might behave right on low but not high CO2 levels or not on high/low humidity, etc.)
- Youden 4y agoYou generally don't have to go to all that effort unless you want extreme accuracy. For "Good enough", you buy the sensor, follow the application notes and instructions from the manufacturer, calibrate it in fresh outdoor air and you're good to go.
- dathinab 4y agothe problem is it's often not good enough I have seen tests with sensing devices which seemingly where good outside but then e.g. scaled wrongly being way of at higher CO2 levels (either way higher or way lower).
- Youden 4y agoI haven't seen that and I've deployed nearly 100 sensors. Perhaps you've left the auto calibration on? That's usually a recipe for disaster (and one that can be avoided by reading the datasheet).
- wkat4242 4y agoThese sensors all auto calibrate, you just have to expose them to outside air once a week. This includes all the sensors integrated in these off the shelf products like the author is using, which could explain the extremely high readings.