search

brendan-w / python-OBD

OBD-II serial module for reading engine data
GNU General Public License v2.0
1.02k stars 360 forks source link

Cannot load commands: No connection to car #179

Closed Hanlon2222 closed 4 years ago

Hanlon2222 commented 4 years ago

I am doing a project for school that involves reading data from an ELM327 using a raspberry pi. I have never coded python before and have very limited knowledge of raspberry pi computers. I am using a raspberry pi 4B 4GB and the ELM327 device i am using runs on ELM327 v1.5.

Here is the code i am using: `import obd, time

Show Ports

ports=obd.scan_serial() print (ports)

Debugging

obd.logger.setLevel(obd.logging.DEBUG)

Setting Connection

connection=obd.OBD(baudrate=38400,fast=False,timeout=10,check_voltage=True)

Checking Connection

from obd import OBDStatus connection.status()==OBDStatus.CAR_CONNECTED

Checking For Data

while True: for i in commands_list: cmd1=obd.commands.RPM response1=connection.query(cmd1) print(response1.value)

    cmd2=obd.commands.PIDS_A
    response2=connection.query(cmd2)
    print(response2.value)

    cmd3=obd.commands.COOLANT_TEMP
    response3=connection.query(cmd3)
    print(response3.value)
    time.sleep(0.5)

`

Here is what the program returns:

['/dev/rfcomm0'] [obd.obd] ======================= python-OBD (v0.7.1) ======================= [obd.obd] Using scan_serial to select port [obd.obd] Available ports: ['/dev/rfcomm0'] [obd.obd] Attempting to use port: /dev/rfcomm0 [obd.elm327] Initializing ELM327: PORT=/dev/rfcomm0 BAUD=38400 PROTOCOL=6 [obd.elm327] write: 'ATZ\r' [obd.elm327] wait: 1 seconds [obd.elm327] read: b'ATZ\r\r\rELM327 v1.5\r\r>' [obd.elm327] write: 'ATE0\r' [obd.elm327] read: b'ATE0\rOK\r\r>' [obd.elm327] write: 'ATH1\r' [obd.elm327] read: b'OK\r\r>' [obd.elm327] write: 'ATL0\r' [obd.elm327] read: b'OK\r\r>' [obd.elm327] write: 'AT RV\r' [obd.elm327] read: b'14.5V\r\r>' [obd.elm327] %s is not a valid protocol. Please use "1" through "A" [obd.elm327] Adapter connected, but the ignition is off [obd.obd] Cannot load commands: No connection to car [obd.obd] =================================================================== Traceback (most recent call last): File "Test.py", line 32, in for i in commands_list: NameError: name 'commands_list' is not defined pi@raspberrypi:~/Project $ python Test.py ['/dev/rfcomm0'] [obd.obd] ======================= python-OBD (v0.7.1) ======================= [obd.obd] Using scan_serial to select port [obd.obd] Available ports: ['/dev/rfcomm0'] [obd.obd] Attempting to use port: /dev/rfcomm0 [obd.elm327] Initializing ELM327: PORT=/dev/rfcomm0 BAUD=38400 PROTOCOL=auto [obd.elm327] write: 'ATZ\r' [obd.elm327] wait: 1 seconds [obd.elm327] read: b'\r\rELM327 v1.5\r\r>' [obd.elm327] write: 'ATE0\r' [obd.elm327] read: b'ATE0\rOK\r\r>' [obd.elm327] write: 'ATH1\r' [obd.elm327] read: b'OK' [obd.elm327] write: 'ATL0\r' [obd.elm327] read: b'\r\r>' [obd.elm327] closing port [obd.elm327] write: 'ATZ\r' [obd.elm327] ATL0 did not return 'OK' [obd.obd] Closing connection [obd.obd] Cannot load commands: No connection to car [obd.obd] =================================================================== Traceback (most recent call last): File "Test.py", line 32, in for i in commands_list: NameError: name 'commands_list' is not defined pi@raspberrypi:~/Project $ python Test.py /dev/rfcomm0 ['/dev/rfcomm0'] [obd.obd] ======================= python-OBD (v0.7.1) ======================= [obd.obd] Using scan_serial to select port [obd.obd] Available ports: ['/dev/rfcomm0'] [obd.obd] Attempting to use port: /dev/rfcomm0 [obd.elm327] Initializing ELM327: PORT=/dev/rfcomm0 BAUD=38400 PROTOCOL=auto [obd.elm327] write: 'ATZ\r' [obd.elm327] wait: 1 seconds [obd.elm327] read: b'\r\rELM327 v1.5\r\r>' [obd.elm327] write: 'ATE0\r' [obd.elm327] read: b'ATE0\rOK\r\r>' [obd.elm327] write: 'ATH1\r' [obd.elm327] read: b'OK\r\r>' [obd.elm327] write: 'ATL0\r' [obd.elm327] read: b'OK\r\r' [obd.elm327] write: 'AT RV\r' [obd.elm327] read: b'>' [obd.elm327] closing port [obd.elm327] write: 'ATZ\r' [obd.elm327] No answer from 'AT RV' [obd.obd] Closing connection [obd.obd] Cannot load commands: No connection to car [obd.obd] =================================================================== Traceback (most recent call last): File "Test.py", line 32, in for i in commands_list: NameError: name 'commands_list' is not defined pi@raspberrypi:~/Project $ python3 Test.py /dev/rfcomm0 ['/dev/rfcomm0'] [obd.obd] ======================= python-OBD (v0.7.1) ======================= [obd.obd] Using scan_serial to select port [obd.obd] Available ports: ['/dev/rfcomm0'] [obd.obd] Attempting to use port: /dev/rfcomm0 [obd.elm327] Initializing ELM327: PORT=/dev/rfcomm0 BAUD=38400 PROTOCOL=auto [obd.elm327] write: b'ATZ\r' [obd.elm327] wait: 1 seconds [obd.elm327] read: b'\r\rELM327 v1.5\r\r>' [obd.elm327] write: b'ATE0\r' [obd.elm327] read: b'ATE0\rOK\r\r>' [obd.elm327] write: b'ATH1\r' [obd.elm327] read: b'OK\r\r>' [obd.elm327] write: b'ATL0\r' [obd.elm327] read: b'OK\r\r>' [obd.elm327] write: b'AT RV\r' [obd.elm327] read: b'14.5V\r\r>' [obd.elm327] write: b'ATSP0\r' [obd.elm327] read: b'OK\r' [obd.elm327] write: b'0100\r' [obd.elm327] read: b'\r>' [obd.elm327] write: b'ATDPN\r' [obd.elm327] read: b'SEARCHING...\r7E8 06 41 00 BE 3D A8 13 \r\r>' [obd.elm327] Failed to retrieve current protocol [obd.elm327] Adapter connected, but the ignition is off [obd.obd] Cannot load commands: No connection to car [obd.obd] =================================================================== Traceback (most recent call last): File "Test.py", line 32, in for i in commands_list: NameError: name 'commands_list' is not defined pi@raspberrypi:~/Project $ python Test.py Traceback (most recent call last): File "Test.py", line 10, in connection=obd.OBD(sys.argv[1]) IndexError: list index out of range pi@raspberrypi:~/Project $ python Test.py [obd.obd] ======================= python-OBD (v0.7.1) ======================= [obd.obd] Explicit port defined [obd.elm327] Initializing ELM327: PORT=Test.py BAUD=auto PROTOCOL=auto [obd.elm327] Could not configure port: (25, 'Inappropriate ioctl for device') [obd.obd] Closing connection [obd.obd] Cannot load commands: No connection to car [obd.obd] =================================================================== Not Connected [obd.obd] Query failed, no connection available None ['/dev/rfcomm0'] [obd.obd] ======================= python-OBD (v0.7.1) ======================= [obd.obd] Using scan_serial to select port [obd.obd] Available ports: ['/dev/rfcomm0'] [obd.obd] Attempting to use port: /dev/rfcomm0 [obd.elm327] Initializing ELM327: PORT=/dev/rfcomm0 BAUD=38400 PROTOCOL=auto [obd.elm327] write: 'ATZ\r' [obd.elm327] wait: 1 seconds [obd.elm327] read: b'\r\rELM327 v1.5\r\r>' [obd.elm327] write: 'ATE0\r' [obd.elm327] read: b'ATE0\rOK\r\r>' [obd.elm327] write: 'ATH1\r' [obd.elm327] read: b'OK\r\r>' [obd.elm327] write: 'ATL0\r' [obd.elm327] read: b'OK\r\r>' [obd.elm327] write: 'AT RV\r' [obd.elm327] read: b'14.4V\r\r>' [obd.elm327] write: 'ATSP0\r' [obd.elm327] read: b'OK\r\r' [obd.elm327] write: '0100\r' [obd.elm327] read: b'>' [obd.elm327] write: 'ATDPN\r' [obd.elm327] read: b'SEARCHING...\r7E8 06 41 00 BE 3D A8 13 \r\r>' [obd.elm327] Failed to retrieve current protocol [obd.elm327] Adapter connected, but the ignition is off [obd.obd] Cannot load commands: No connection to car [obd.obd] =================================================================== Traceback (most recent call last): File "Test.py", line 32, in for i in commands_list: NameError: name 'commands_list' is not defined

Hanlon2222 commented 4 years ago

I was able to solve this problem by unpairing and repairing my ELM327 device using bluetoothctl in terminal.