Class: OBD::Command

Inherits:
Object
  • Object
show all
Defined in:
lib/obd/command.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Command

Returns a new instance of Command.



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# File 'lib/obd/command.rb', line 4

def initialize

end

Class Method Details

.format_result(command, result) ⇒ Object 



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# File 'lib/obd/command.rb', line 8

def self.format_result command, result
  if is_command?(command) && result != "NO DATA"
    pids[command.to_sym].call h(result), h(result).to_i(16)
  else
    result
  end
end

.h(response) ⇒ Object 



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# File 'lib/obd/command.rb', line 74

def self.h response
  response[4..-1]
end

.is_command?(command) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/obd/command.rb', line 24

def self.is_command? command
  pids.keys.include? command.to_sym
end

.pid ⇒ Object 



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# File 'lib/obd/command.rb', line 28

def self.pid
  {
    "atrv" => [:battery_voltage, lambda {|x| x.to_s}],
    "0100" => [:pids_supported_1]
  }
end

.pids ⇒ Object 



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# File 'lib/obd/command.rb', line 35

def self.pids
  {
    pids_supported_1:                      lambda {|x,d| d.to_s(2).split('').each_with_index.map{|b,i| pids.keys[i] if b == '1'}},
    monitor_status_since_clear:            lambda {|x| x},
    freeze_dtc:                            lambda {|x| x},
    fuel_system_status:                    lambda {|x| x},
    calculated_engine_load:                lambda {|x,d| "%0.2f" % (d * 100.0 / 255.0) + '%'},
    engine_coolent_temperature:            lambda {|x,d| "%0.2f" % (d * 1.8 - 104) + '*F'},
    short_term_fuel_trim_bank_1:           lambda {|x,d| "%0.2f" % (d * 0.78125 - 100) + '%'},
    long_term_fuel_trim_bank_1:            lambda {|x,d| "%0.2f" % (d * 0.78125 - 100) + '%'},
    short_term_fuel_trim_bank_2:           lambda {|x,d| "%0.2f" % (d * 0.78125 - 100) + '%'},
    long_term_fuel_trim_bank_2:            lambda {|x,d| "%0.2f" % (d * 0.78125 - 100) + '%'},
    fuel_pressure:                         lambda {|x,d| "%0.2f" % (d * 3 * 0.145) + 'psi'},
    intake_manifold_absolute_pressure:     lambda {|x,d| "%0.2f" % (d * 0.145) + 'psi'},
    engine_rpm:                            lambda {|x,d| "%0.2f" % (d / 4.0) + 'rpm'},
    vehicle_speed:                         lambda {|x,d| "%0.2f" % (d * 0.621371192) + 'mph'},
    timing_advance:                        lambda {|x,d| "%0.2f" % (d / 2.0 - 64) + '*'},
    intake_air_temperature:                lambda {|x,d| "%0.2f" % (d * 1.8 - 104) + '*F'},
    maf_air_flow_rate:                     lambda {|x,d| "%0.2f" % (d / 100.0) + 'grams/sec'},
    throttle_position:                     lambda {|x,d| "%0.2f" % (d * 100 / 255.0) + '%'},
    commanded_secondary_air_status:        lambda {|x| x}, # bit encoded
    oxygen_sensors_present:                lambda {|x| x}, # [A0..A3] == Bank 1,Sensors 1-4.[A4..A7]
    bank_1_sensor_1_oxygen_sensor_voltage: lambda {|x| x},
    bank_1_sensor_2_oxygen_sensor_voltage: lambda {|x| x},
    bank_1_sensor_3_oxygen_sensor_voltage: lambda {|x| x},
    bank_1_sensor_4_oxygen_sensor_voltage: lambda {|x| x},
    bank_2_sensor_1_oxygen_sensor_voltage: lambda {|x| x},
    bank_2_sensor_2_oxygen_sensor_voltage: lambda {|x| x},
    bank_2_sensor_3_oxygen_sensor_voltage: lambda {|x| x},
    bank_2_sensor_4_oxygen_sensor_voltage: lambda {|x| x},
    obd_standards_vehicle_conforms_to:     lambda {|x| x}, # bit encoded
    oxygen_sensors_present_2:              lambda {|x| x}, # complicated...
    aux_input_status:                      lambda {|x| (x == 1).inspect}, # Power Take Off (PTO) status is active?
    run_time_since_engine_start:           lambda {|x,d| d}, # seconds
    pids_supported_2:                      lambda {|x,d| d.to_s(2).split('').each_with_index.map{|b,i| pids.keys[i+33] if b == '1'}}, # bit encoded
    distance_traveled_with_mil_on:         lambda {|x,d| d.to_s + 'km'}
  }
end

.to_hex(command) ⇒ Object 



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# File 'lib/obd/command.rb', line 16

def self.to_hex command
  if is_command? command
    "01%02x" % pids.keys.index(command.to_sym)
  else
    command
  end
end