GY-63_MS5611/libraries/I2C_ASDX/README.md
2021-06-07 11:49:28 +02:00

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