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obd_sensors.py
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#!/usr/bin/env python
###########################################################################
# obd_sensors.py
#
# Copyright 2004 Donour Sizemore (donour@uchicago.edu)
# Copyright 2009 Secons Ltd. (www.obdtester.com)
#
# This file is part of pyOBD.
#
# pyOBD is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# pyOBD is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with pyOBD; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
###########################################################################
def hex_to_int(str):
i = eval("0x" + str, {}, {})
return i
def maf(code):
code = hex_to_int(code)
return code * 0.00132276
def throttle_pos(code):
code = hex_to_int(code)
return code * 100.0 / 255.0
def intake_m_pres(code): # in kPa
code = hex_to_int(code)
return code / 0.14504
def rpm(code):
code = hex_to_int(code)
return code / 4
def speed(code):
code = hex_to_int(code)
return code / 1.609
def percent_scale(code):
code = hex_to_int(code)
return code * 100.0 / 255.0
def timing_advance(code):
code = hex_to_int(code)
return (code - 128) / 2.0
def sec_to_min(code):
code = hex_to_int(code)
return code / 60
def temp(code):
code = hex_to_int(code)
return code - 40
def cpass(code):
#fixme
return code
def fuel_trim_percent(code):
code = hex_to_int(code)
return (code - 128.0) * 100.0 / 128
def dtc_decrypt(code):
#first byte is byte after PID and without spaces
num = hex_to_int(code[:2]) #A byte
res = []
if num & 0x80: # is mil light on
mil = 1
else:
mil = 0
# bit 0-6 are the number of dtc's.
num = num & 0x7f
res.append(num)
res.append(mil)
numB = hex_to_int(code[2:4]) #B byte
for i in range(0,3):
res.append(((numB>>i)&0x01)+((numB>>(3+i))&0x02))
numC = hex_to_int(code[4:6]) #C byte
numD = hex_to_int(code[6:8]) #D byte
for i in range(0,7):
res.append(((numC>>i)&0x01)+(((numD>>i)&0x01)<<1))
res.append(((numD>>7)&0x01)) #EGR SystemC7 bit of different
return res
def hex_to_bitstring(str):
bitstring = ""
for i in str:
# silly type safety, we don't want to eval random stuff
if type(i) == type(''):
v = eval("0x%s" % i)
if v & 8 :
bitstring += '1'
else:
bitstring += '0'
if v & 4:
bitstring += '1'
else:
bitstring += '0'
if v & 2:
bitstring += '1'
else:
bitstring += '0'
if v & 1:
bitstring += '1'
else:
bitstring += '0'
return bitstring
class Sensor:
def __init__(self,sensorName, sensorcommand, sensorValueFunction, u):
self.name = sensorName
self.cmd = sensorcommand
self.value= sensorValueFunction
self.unit = u
SENSORS = [
Sensor(" Supported PIDs", "0100", hex_to_bitstring ,"" ),
Sensor("Status Since DTC Cleared", "0101", dtc_decrypt ,"" ),
Sensor("DTC Causing Freeze Frame", "0102", cpass ,"" ),
Sensor(" Fuel System Status", "0103", cpass ,"" ),
Sensor(" Calculated Load Value", "0104", percent_scale ,"" ),
Sensor(" Coolant Temperature", "0105", temp ,"C" ),
Sensor(" Short Term Fuel Trim", "0106", fuel_trim_percent ,"%" ),
Sensor(" Long Term Fuel Trim", "0107", fuel_trim_percent ,"%" ),
Sensor(" Short Term Fuel Trim", "0108", fuel_trim_percent ,"%" ),
Sensor(" Long Term Fuel Trim", "0109", fuel_trim_percent ,"%" ),
Sensor(" Fuel Rail Pressure", "010A", cpass ,"" ),
Sensor("Intake Manifold Pressure", "010B", intake_m_pres ,"psi" ),
Sensor(" Engine RPM", "010C", rpm ,"" ),
Sensor(" Vehicle Speed", "010D", speed ,"MPH" ),
Sensor(" Timing Advance", "010E", timing_advance ,"degrees"),
Sensor(" Intake Air Temp", "010F", temp ,"C" ),
Sensor(" Air Flow Rate (MAF)", "0110", maf ,"lb/min" ),
Sensor(" Throttle Position", "0111", throttle_pos ,"%" ),
Sensor(" Secondary Air Status", "0112", cpass ,"" ),
Sensor(" Location of O2 sensors", "0113", cpass ,"" ),
Sensor(" O2 Sensor: 1 - 1", "0114", fuel_trim_percent ,"%" ),
Sensor(" O2 Sensor: 1 - 2", "0115", fuel_trim_percent ,"%" ),
Sensor(" O2 Sensor: 1 - 3", "0116", fuel_trim_percent ,"%" ),
Sensor(" O2 Sensor: 1 - 4", "0117", fuel_trim_percent ,"%" ),
Sensor(" O2 Sensor: 2 - 1", "0118", fuel_trim_percent ,"%" ),
Sensor(" O2 Sensor: 2 - 2", "0119", fuel_trim_percent ,"%" ),
Sensor(" O2 Sensor: 2 - 3", "011A", fuel_trim_percent ,"%" ),
Sensor(" O2 Sensor: 2 - 4", "011B", fuel_trim_percent ,"%" ),
Sensor(" OBD Designation", "011C", cpass ,"" ),
Sensor(" Location of O2 sensors", "011D", cpass ,"" ),
Sensor(" Aux input status", "011E", cpass ,"" ),
Sensor(" Time Since Engine Start", "011F", sec_to_min ,"min" ),
Sensor(" Engine Run with MIL on", "014E", sec_to_min ,"min" ),
]
#___________________________________________________________
def test():
for i in SENSORS:
print i.name, i.value("F")
if __name__ == "__main__":
test()