Adafruit_BMP085_Unified library example used with Digistump Digix.
BMP085 is consistently off on readings; for example, BMP085 readings 29.33 in. Hg. and 998.39 mb compared to local NWS office readings of 30.33 and 1028.20 mb. Differences are 1.00 in. Hg. and 34.81 mb.
Digix = 84 MHz Clock Speed
32-bit ARM Processor (AT91SAM3X8E)
Arduino compatiable
Same sensor on the Arduino Mega 2560 are much closer --only off a few hundredths; so I believe the sensor is not defective.
Any recommendations?
BMP085 Readings off; used with Digistump Digix
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- tech500
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- Franklin97355
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Re: BMP085 Readings off; used with Digistump Digix
I'd check your code to make sure you are doing the math correctly. Check the raw output to see if it is close between the two processors.Any recommendations?
- tech500
- Posts: 199
- Joined: Wed Dec 04, 2013 3:53 pm
Re: BMP085 Readings off; used with Digistump Digix
Math looks correct; readings are close to expected conversion results. Conversion math verified on the Internet; only reference I have currently.
I am wondering if the library needs to tweaked for the Digistump Digix processor speed.
Also, I2C bus from BMP085 Sensor is going to level-shifter, then Digix.
Has anyone used the Adafruit_BMP085_Unified library with the Digistump Digix? Were the Barometric Pressure readings close to NWS readings?
William
I am wondering if the library needs to tweaked for the Digistump Digix processor speed.
Also, I2C bus from BMP085 Sensor is going to level-shifter, then Digix.
Has anyone used the Adafruit_BMP085_Unified library with the Digistump Digix? Were the Barometric Pressure readings close to NWS readings?
William
Please be positive and constructive with your questions and comments.