![]() ![]() In relation to the base unit of => (pascals), 1 Psi (psi) is equal to 6894.7572932 pascals, while 1 Megapascals (MPa) = 1000000 pascals. How to convert Psi to Megapascals (psi to MPa)?ġ x 0.0068947572932 MPa = 0.0068947572932 Megapascals.Īlways check the results rounding errors may occur. I suspect this is a little low as my (admittedly hacked together) weather station says its ~1016.1 hPA which is about 14.7 PSI.The base unit for pressure is pascals (Non-SI Unit) Some mapping and rounding and viola, 14 PSI sitting in the open. ![]() Shifting the expected range ( to a max of 2.7649 V which should read at ~3431 (using the other post that has now disappeared from my tabs - there’s 1241 ‘steps’ per volt). I got it to go as low as I could and decided to call that zero PSI (~155 analog read) which is roughly 0.1239 V. With it spitting out raw values, I pulled on the plunger - which could have damaged the sensor, but there’s odds it’d have gotten scrapped anyway. Anyway, the tip of it without a needle fits almost perfectly into the end of the sensor without going in too far. I have another that has a “needle” that I use to put lithium grease in awkward or small places. The company I work at has these crazy huge plungers - as in they look like you’re about to shoot up a gorilla sized (I’m sure they come in larger sizes). Huzzah! Had to make some assumptions, but I think I have something usable (of course, I’ll have to re-do some of this when I switch sensors, but I know how to get there now (mostly)). Semi-mostly-unrelated, I don’t think the DS18B20 likes being used next to the alternator on my jeep… but thats another topic… I’m certain I’m missing something obvious and its driving me nuts - this is a hard topic to search for too, so if the exact answer is already posted somewhere, pleeease send me there By my calculations (that are a mess), I end up somewhere between 80psi and 100psi (quite the headache I would imagine…) I’ve tried 2 of these sensor with the same rating, and one at rest gives me 1868 ish and the other 1955 ish. I tried using some mapping functions to help me out but the results either didn’t make sense or something is not physically working. Range from 0-174 PSI ~3277 (starting at 409, maxing at 3686)Īssuming my “0 PSI” is at 0.5 v (for 5v) then that should mean ~0.33v maxing out at 2.97v This seems a little high, but I could be wrong. Its currently reading ~1955 on my analog input. Worth noting that last I checked, the atmospheric pressure should be ~14.78 PSI. ![]() I’ve got a voltage divider to get me into the 3.3v readable range. Sensor is a “5 V” 0.5v to 4.5v pressure transducer capable of measuring 0-174 PSI. I found a number of posts that I feel got me very close but I’m missing something key and I’m not sure what.įor simplicity, lets say this sensor is awesome and does what it’s touted to do (yeah right, but lets start there). I feel like this belongs in the general category, but I couldn’t post to it.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |