Class: I2cWithClockChip

Inherits:
ArduinoSketch show all
Defined in:
lib/examples/i2c_with_clock_chip.rb

Instance Attribute Summary

Attributes inherited from ArduinoSketch

#pins

Instance Method Summary collapse

Methods inherited from ArduinoSketch

#add, add_to_setup, #array, #assembler, #comment_box, #compose_setup, #define, #delay, #digitalWrite, #formatted_print, #initialize, #input_pin, #input_pins, output_pin, #output_pin, post_process_ruby_to_c_methods, pre_process, #serial_begin

Methods included from ExternalVariableProcessing

#c_type, #check_variable_type, #post_process_arrays, #post_process_vars, #pre_process_vars, #process_external_vars, #translate_variables

Constructor Details

This class inherits a constructor from ArduinoSketch

Instance Method Details

#clear_bottom_line ⇒ Object 



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# File 'lib/examples/i2c_with_clock_chip.rb', line 119

def clear_bottom_line
    myLCD.setxy 0,3
    myLCD.print "?l"
end

#loop ⇒ Object 



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# File 'lib/examples/i2c_with_clock_chip.rb', line 39

def loop
  until myTemp.reset do   # reset bus, verify its clear and high
    clear_bottom_line
    myLCD.print " <1Wire Buss Error>"
    delay 2000
  end
	
		myTemp.skip                 # "listen up - everybody!"
		myTemp.write 0x44, 1        # temperature sensors, strta conversion

		myLCD.setxy 6,0             # while they do that, lets print date/time
   myLCD.print rtc.get(5, 1)
   	myLCD.print "/"
   myLCD.print rtc.get(4, 0)
   	myLCD.print "/"
   myLCD.print rtc.get(6, 0)
   	myLCD.setxy 6,1
   	printlz rtc.get(2, 0)
   	myLCD.print ":"
   printlz rtc.get(1, 0)
   	myLCD.print ":"
   printlz rtc.get(0, 0)

		delay 800                   # conversion takes about 750 msecs

		until myTemp.reset do       # reset bus, verify its clear and high
		  clear_bottom_line
		  myLCD.print " <1Wire Buss Error>"
		  delay 2000
		end
 		myTemp.skip                 # listen up!
		myTemp.write 0xBE, 1        # send me your data conversions

    @lo_byte = myTemp.read      # get irst byte
    @hi_byte = myTemp.read      # get second byte
    
    # -------------------------------------------------------------
    clear_bottom_line       # this code is debug - not necessary
    myLCD.setxy 4,3         # raw hex display of temp value
    myLCD.print "raw = 0x"
    print_hexbyte @hi_byte  # prints 2 digit hex w/lead 0
    print_hexbyte @lo_byte
    # -------------------------------------------------------------

    7.times { @device_crc = myTemp.read } # get next 6 bytes, drop them on floor
                                          # next byte the ninth byte is the CRC
    
                            # DS18B20 brings data temperature back as 12 bits
                            # in degrees centigrade with 4 bits fractional, that is 
                            # each bit s 1/16 of a degreeC
                            
    @t_reading  =   build_int @hi_byte, @lo_byte
    @sign_bit   =   bit_and @t_reading, 0x8000
    @t_reading  =   twos_comp @t_reading   if @sign_bit  # negative

    @tc_100 = (6 * @t_reading) + (@t_reading / 4)   #multiply by (100 * 0.0625) or 6.25

    myLCD.setxy 2,2
    if @sign_bit
        myLCD.print "-"
    else
        myLCD.print " "
    end
    myLCD.print(@tc_100 / 100)             # separate off the whole 
    myLCD.print "."
    printlz(@tc_100 % 100)                  # and fractional portions
    myLCD.print " degrees C"

end

#print_hexbyte(w) ⇒ Object 



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# File 'lib/examples/i2c_with_clock_chip.rb', line 114

def	print_hexbyte(w)
			myLCD.print "0" if w < 0x10
			myLCD.print w, 0x10
end

#printlz(w) ⇒ Object 



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# File 'lib/examples/i2c_with_clock_chip.rb', line 109

def	printlz(w)
			myLCD.print "0" if w < 10
			myLCD.print w
end