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Showing results for tags 'pressure'.
I finished up my first Energia project, a template library for the Bosch BMP085 temperature and pressure sensor. It uses I2C and supports temperature in Celsius and pressure in Pascal. https://github.com/astuder/BMP085-template-library-Energia I connected the GY-80 breakout commonly found on eBay, but it should also work with most other BMP085 breakouts, like the ones from Adafruit or Sparkfun. Note that I had to patch Energia to make 1-byte read work on MSP430G2553 with Rev1.5 LaunchPad. I also had to remove the LED2 jumper, probably due to too weak I2C pull-up. Update: Tested on La
Decided to start a project based discussion regarding the BP I posted http://forum.43oh.com/topic/4301-manifold-absolute-pressure-sensing/ so as to not clutter that up. For those that haven't visited that, here's a re-cap: MCU samples an MPX4250A absolute pressure sensor, takes the reading and looks up a value from a table, and sends that to a DAC for output. It's actually two DACs though so there are possibly two values to read and send. There's an SPI eeprom for storing the values and the DAC's are set over SPI as well. There will be software that interfaces to it, at least for
I have to mention RobG and cubeberg have helped with this. THANKS!!!! What it is, is one pressure sensor affecting two, 16 bit DAC output channels. What it will do (hopefully ;-)) is read an (automotive) industry standard MAP (manifold absolute pressure) sensor- in this case an MPX4250A 20-250 kPa (kilo Pascal) / 2.9-36.3 PSI sensor (~100 kPa / 14.7 PSI is ambient pressure at sea level), and appear as up to two potentially different sensors. Possible uses could include: replacing obsolete MAP sensors with more readily available ones because of different output range / scaling; fooli