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125 lines
4.3 KiB
Markdown
125 lines
4.3 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/I2C_ASDX/blob/master/LICENSE)
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[](https://github.com/RobTillaart/I2C_ASDX/releases)
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# I2C_ASDX
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Arduino library for I2C ASDX pressure sensor
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## Description
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The ASDX sensor of Honeywell exist in many variations.
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Check the datasheet of your type for all the details.
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The I2C_ASDX library can read the sensor and give the pressure in millibar, bar or PSI or many other units. See below.
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The interface:
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#### Constructor
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- **I2C_ASDX(uint8_taddress, uint8_t psi, TwoWire \*wire = &Wire)** Constructor, I2C address and maximum pressure. Optional the wire interface can be defined.
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- **bool begin(uint8_t sda, uint8_t scl)** I2C parameters for ESP32 a.o. Returns true if address can be found on I2C bus.
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- **bool begin()** for UNO and other boards supporting Wire. Returns true if address can be found on I2C bus.
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- **void reset()** resets internal variables, including pressure.
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- **bool isConnected()** tests if address can be found on I2C bus.
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- **bool available()** wrapper around isConnected. Obsolete in the future.
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#### Read
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Before any call to **getPressure()** one need to call **read()** unless one wants the last value read.
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- **int read()** actually reads the sensor, checks for errors, calculates the pressure and set the lastRead timestamp. Returns **I2C_ASDX_OK** or an error code.
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#### Units
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- **int getPressure()** returns pressure (integer format) in milliBar, will return 0 after reset() and no read done.
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- **float getMilliBar()** returns pressure in milliBar.
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- **float getBar()** returns pressure in bar.
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- **float getPSI()** returns pressure in PSI = Pounds per Square Inch.
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- **float getATM()** returns pressure in Atmosphere.
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- **float getDynes()** returns pressure in Dynes.
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- **float getInchHg()** returns pressure in inches mercury.
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- **float getInchH2O()** returns pressure in inches water.
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- **float getPascal()** returns pressure in Pascal. Note this is the SI unit.
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- **float getTORR()** returns pressure in TORR.
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- **float getCmHg()** returns pressure in centimetre mercury.
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- **float getCmH2O()** returns pressure in centimetre water.
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- **float getMSW()** returns pressure in Meters of Sea Water. (under water pressure unit).
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#### State
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- **uint16_t errorCount()** total counter for the number of errors occurred.
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- **uint32_t lastRead()** time in milliseconds of last successful read of the sensor.
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- **int state()** last known state of read, also returned by **read()**
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| state | meaning |
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|:------------------------|:-------------------|
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| I2C_ASDX_OK | no error |
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| I2C_ASDX_INIT | begin() not called |
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| I2C_ASDX_READ_ERROR | I2C error |
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| I2C_ASDX_C000_ERROR | sensor error |
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| I2C_ASDX_CONNECT_ERROR | I2C error |
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## Testing
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The library is tested with only 3 different sensors, all of the PG type.
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Code is prepared but not tested for 15, 5 and 1 PSI too.
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```
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ID UNIT TYPE DESCRIPTION
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output is proportional to difference
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PG PSI Gage * between applied pressure and atmospheric pressure
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MG mBar Gage * idem
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BG Bar Gage * idem
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KG KiloPascal Gage * idem
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D Differential * between pressure applied to each of the ports.
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A Absolute * between applied pressure and built-in reference to vacuum.
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ADDRESS PRESSURE RANGE TYPE P A T V
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0x58 100 psi 0..6895 mBar SSCDANN 100PG 5 A 5
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0x38 60 psi 0..4137 mbar SSCDANN 060PG 3 A 5
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0x28 30 psi 0..2068 mbar SSCDANN 030PG 2 A 5
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P = pressure range
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A = I2C address indicator
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T = accuracy range
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V = voltage (3 volt also supported, not tested)
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```
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That said it is expected that the library is modifiable to support many
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more as long as they have the following raw read values.
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```
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1638 = 0 PSI
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14746 = max PSI
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```
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## Testing
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TESTED TYPES - type A 10% - 90% only
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## Future
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#### Must
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- find a good reference for conversion formula constants.
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-
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## Operation
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See examples
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