Class: IoT::HTU21D

Inherits:
HumitureSensor show all
Defined in:
lib/iot/htu21d.rb

Overview

HTU21D - relative humidity and temperature digital senspr

Constant Summary collapse

I2C_ADDR =

inspired by github.com/leon-anavi/rpi-examples/HTU21D

0x40
CMD_TRIG_TEMP_HM = 
0xE3
CMD_TRIG_HUMID_HM = 
0xE5
CMD_TRIG_TEMP_NHM = 
0xF3
CMD_TRIG_HUMID_NHM = 
0xF5
CMD_WRITE_USER_REG = 
0xE6
CMD_READ_USER_REG = 
0xE7
CMD_RESET = 
0xFE

Instance Method Summary collapse

Methods inherited from HumitureSensor

#humidity, #to_s

Methods inherited from TemperatureSensor

#celsius, #fahrenheit, #kelvin, #reaumur, #temperature, #to_s

Methods inherited from DigitalReceptor

one_wire_file

Methods inherited from Receptor

#model_name, #read

Constructor Details

#initialize(device_address = I2C_ADDR, bus_number = 1) ⇒ HTU21D

Returns a new instance of HTU21D.



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# File 'lib/iot/htu21d.rb', line 16

def initialize(device_address=I2C_ADDR, bus_number=1)
  @sensor_name = 'HTU21D'
  @device_address = device_address

  @buffer_size = 3
  @device = ::I2C.create("/dev/i2c-#{bus_number}")
  @device.write(I2C_ADDR, CMD_RESET)
  @temperature, @humidity = read_data
end

Instance Method Details

#name ⇒ Object 



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# File 'lib/iot/htu21d.rb', line 34

def name
  @sensor_name
end

#read_data ⇒ Object

Read values by ‘DhtSensor.read’ from ‘dht-sensor-ffi’



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# File 'lib/iot/htu21d.rb', line 28

def read_data
  @temperature = t
  @humidity = h
  [@temperature, @humidity]
end