Hello guys!
Iam looking for a sensor datasheet to calibrate the temperature readings.
This is a Bosch 4bar Tmap sensor part number:0281006059
This is an automotive sensor and i would like to measure pressure and temperature with this sensor using arduino with an lcd.
I have got the pressure mathematical equation,and its working(doesnt tested with realtime pressure yet)
And now i would like to make it work with the temperature side too
Its a 4 wire sensor if i measure ohms at number 1 and 2 i got ohm reading if i touch the sensor ohm readings are change.
1:gnd
2:temp out
3:+5V
4:pressure out
Any1 can help me with this,or how can i start to work with this sensor?
Are you afraid to hook up the temperature out wire instead of the pressure out wire? To me that would be an easy test.
Paul
Hello!
I dont understad this can you explain?
Ricsi168:
Hello!
I dont understad this can you explain?
You said the pressure is working properly, so why not connect the temperature lead up as if it was the pressure lead.
Paul
Because the pressure out pin shows voltage and the temp out pin shows resistance
the temp out pin shows resistance
Then the temperature sensor may be a thermistor. Google "arduino thermistor".
Any1 can help me with this,or how can i start to work with this sensor?
Yes, if you post a link to the data sheet.
Yes thats what i need too i cant find a datasheet.....yes its a thermistor i think.
I did a voltage divider circuit,and put a code on it serial monitor shows temperature and volts BUT
the temp readings are way off and when the you touch the sensor temperature goes down not up
i dont know how can i caluculate or calibrate the sensor readings
Not a complete cross-post, but the OP should have mentioned his other thread on the same topic.
http://forum.arduino.cc/index.php?topic=552036.0
Ricsi168:
Yes thats what i need too i cant find a datasheet.
Did you salvage this from something or did you buy it?
i would buy i i can....i bought this combined sensor i would like to make it work!
How is the sensor wired? A schematic with part values and power supplies would help . What is the resistance at room temperature? Can you put it in ice water and measure the resistance. If we have some numbers to work with, maybe we can help.
Ricsi168:
i would buy i i can....i bought this combined sensor i would like to make it work!
So you bought it? Why would you buy something that doesn't have a datasheet for a DIY project? That's just poor planning on your part. Should have checked that out before you dropped your money.
Sensor wiring is
1:gnd
2:temp out
3:+5V
4:pressure out
REsistance ~ measured with multimeter with sensor in water and heating with candle:
23-2740
24-2630
25-2530
26-2450
27-2360
28-2280
29-2210
30-2140
31-2060
32-1990
33-1940
34-1880
35-1810
36-1770
37-1710
38-1670
39-1610
40-1580
41-1530
42-1490
43-1450
44-1400
45-1370
46-1330
47-1300
48-1260
49-1220
50-1190
51-1170
52-1140
53-1120
54-1090
55-1060
56-1040
57-1020
58-1000
59-980
60-960
61-940
62-910
63-900
64-880
65-860
66-840
67-820
68-810
69-800
70-790ohm
That doesn't look like a linear relationship. That's going to make things hard.
This reading where did with multimeter 10-20 ohm maybe off but i measured 2 times
started to heat the sensor from 23°C to 70°C and measured the resistance,than measured from 70 to 23 again i got the same readings few of them are off like 10-20ohm maybe so this readings are stabile lets say
Ricsi168:
This reading where did with multimeter 10-20 ohm maybe off but i measured 2 times
started to heat the sensor from 23°C to 70°C and measured the resistance,than measured from 70 to 23 again i got the same readings few of them are off like 10-20ohm maybe so this readings are stabile lets say
Stabile, but not linear. A 1 degree change in temp doesn't always make the same amount of change in resistance. That means it isn't just a quick calibration. You gotta work out that relationship mathematically now. Again, this would be given in a datasheet. And again, it speaks to not buying things that don't have datasheets unless you want to possibly end up with an expensive piece of useless junk.
Plot all those values in a spreadsheet program and see if you can find a curve to fit them.
Yes i know i did a mistake but now i got this sensor i want to work with i know its goin to hard but maybe there is a solution
can you help me with this spreadsheet?
Ricsi168:
can you help me with this spreadsheet?
After you gave it a whopping 4 minutes of effort? You try first. If that math is over your head then maybe the best bet is just to spend a couple bucks and get a usable sensor. Chalk this up as a lesson to check datasheets in the future.
i found this website when i put my numbers its really close that i measured but i dont understand the mathematical side maybe this is the solution can you check?
http://www.giangrandi.ch/electronics/ntc/ntc.shtml#ntc_param