: si7021 ¶

SI7021 temperature and humidity sensor

Methods

: obj = si7021(arObj) ¶

: obj = si7021(arObj, propertyname, propertyvalue ....) ¶

Constructor to create si7021 sensor

Inputs

arObj - the arduino parent object

propertyname, propertyvalue - optional property name, value pairs. Current known properties are: Current properties are:

I2Caddress

I2C address of the si7021 (default 0x40)

Bus

I2C bus (default 0)

Outputs

obj - created SI7020 object

Example

a = arduino()
sensor = si7021(a)

: [C, timestamp] = readTemperature(obj) ¶

Read the temperature

Inputs

obj - the si7021 object

Outputs

C - read temperature in deg C.

timestamp - timestamp when read

Example

a = arduino()
s = si7021(a)
# get temp
temp = s.readTemperature()

See also: si7021.

: [relH, timestamp] = readHumidity(obj) ¶

Read the relative humidity

Inputs

obj - the si7021 object

Outputs

relH - relative humidity as a percentage (0 - 100.0)

timestamp - timestamp when read

: [readings, overrun] = read(obj) ¶

: [H, C, timestamp, overrun] = read(obj) ¶

Read the sensor data

Inputs

obj - the si2071 sensor object

Outputs

H - humidity reading from sensor.

C - temperature reading from sensor.

timestamp - timestamp when read

overrun - overrun flag.

readings - table structure with fields for Timestamp, Temperature and Humidity.

: relH = info(dsObj) ¶

Read the sensor info

Inputs

dsObj - the si7021 object

Outputs

inf - structure containing the sensor information.

Structure fields are:

Version

Chip firmware version

SensorDd

sensor id value

Type

String for detected chip type

: flush(obj) ¶

Flush sensor data

Inputs

obj - the sensor object

Outputs

None

: release(obj) ¶

Release the resources of the sensor

Inputs

obj - the sensor object

Outputs

None

Package: arduino