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I2C High-Precision Pressure Sensor 
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Joined: Tue Aug 11, 2009 11:49 pm
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Location: Tasmania, the Land Down Under, the Land Downunder!
Post I2C High-Precision Pressure Sensor
While I was sourcing some I2C Chips I came across this I2C High-Precision Pressure Sensor - HP03D

High accuracy, low-cost pressure sensor, ideal for use with weather stations, altimeters and pressure measurement. The unit is fully digital with a 16-Bit ADC on board, with 15-Bit accuracy together with a measurement accuracy of 0.5hpa. Easy to interface to any microcontroller with a standard I²C interface. The unit requires only 3V and full installation instructions are available in the datasheet attached below.

Features
• Pressure Range 300-1100hpa
• 16 Bit ADC
• I²C Serial Interface
• Accurate to 0.5hpa
• Supply Voltage: 2.2 - 3.6V


It's available from Futurlec, http://www.futurlec.com for $9.90.


Attachments:
File comment: HP03 I2C Pressure Sensor Datasheet
HP03 I2C Pressure Sensor.pdf [249.41 KiB]
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Tue Aug 18, 2009 8:54 am
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Location: Rotterdam, The Netherlands
Post Re: I2C High-Precision Pressure Sensor
Hiya Sparra,

Looks great. I am working together with Brian Davis to make an NXT sensor with the SCP1000 pressure/temp sensor. It's a lot more expensive than the one you suggested, though. Here's a copy and paste from the product page.

Quote:
VTI's SCP1000-D01/D11 digital absolute pressure sensors are intended for barometric pressure measurement and altimeter applications for 30kPa...120kPa and -20°C...70°C measuring ranges. The pressure and temperature output data is calibrated and compensated internally and the communication between the SCP1000 and its host micro-controller is realized using SPI or I2C interfaces.

SCP1000 is comprised of a VTI's 3D MEMS capacitive sensing element, a dedicated low power CMOS interface ASIC with on-chip calibration memory, 4 preset measuring modes and a LCP (Liquid Crystal Plastic) MID (Molded Interconnect Device) housing. The component is a surface mountable device incorporating a circular vertical wall for easy waterproof sealing.

Four user selectable measuring modes combine 17-bit resolution (8cm of air column) with 2Hz data read or low power consumption (about 10µA @ 1Hz), or alternatively 15-bit resolution (20cm of air column) with high speed data read (9Hz) or ultra low power consumption. For example, at Low Power mode, the SCP1000 has an overall resolution of 3 Pa and a power consumption of 3.5µA.

Features
  • 30 kPa - 120 kPa measuring range
  • Single +2.4 … 3.3 V supply
  • Four built-in measuring modes plus power down mode
  • Fully calibrated and compensated component
  • On-chip temperature measurement
  • Standard digital output: SPI or I2C
  • Small package size with I-seal gasket option, diameter 6.1 mm, height 1.7 mm
  • Proof pressure 2.0 MPa
  • Pb-free solderable component & RoHS-compatible


We're using the I2C break-outs that you can get from Digikey for about $60 us. We're also using the Sparkfun logic level converter to make sure we're not going to kill our sensors with 4.8V when they can only handle up to about 3.3V.

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Tue Aug 18, 2009 9:12 am
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