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garygid
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ELM327-type OBD Bluetooth devices for Android Apps

Mon May 13, 2013 8:38 am

Discuss the various OBD Bluetooth devices, like the ELM327-type,
which can be used with Turbo3's LEAF Battery Android app.

Sources, prices, realibility, techniques and ease of pairing,

They tend to be available as Genuine (expensive) and various
"clone" types that are typically firmware implementations of
the original ELM327 functions.

The "clones" are available in 4 sizes of packages, mini, short,
stubby, and long. The relative body lengths are approximately
1x, 2x, 3x, and 4x, respectively.
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, sold in 2015
2010 Prius, 2014 silver Tesla S
Nissan EVSE, mod to 240/120v 16A
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

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garygid
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Posts: 12415
Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

Re: ELM327-type OBD Bluetooth devices for Android Apps

Mon May 13, 2013 8:38 am

Links to sources:
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, sold in 2015
2010 Prius, 2014 silver Tesla S
Nissan EVSE, mod to 240/120v 16A
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

User avatar
garygid
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Posts: 12415
Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
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Re: ELM327-type OBD Bluetooth devices for Android Apps

Mon May 13, 2013 8:39 am

Pairing... the most frequent problem area.

The next most frequent is that the device paired Ok,
but the connection between the app and the device
is frequently lost, and re-connection is difficult.

1. With the app closed, use the Android system Settings, and tap Bluetooth
to enter the BT management, ready to turn Bluetooth On.

2. "Start" the car and let it get Ready to drive. Turn Bluetooth On in your phone.

3. Then, quickly plug the ELM327 device into the car's OBD connector.
Assuming no BT devices have been discovered or paired, the phone searches
for discoverable BT devices. Otherwise, ask the phone to search.

4. When the phone discovers a new (new MAC address) ELM327-type Bluetooth
device (often called OBDII), it appears on a list, as not yet paired.
Quickly tap the item on the list, enter the pairing code (most often 1234, rarely 0000,
and very rarely 6789), and attempt to pair with the ELM327 device.
If successful, the listing will show paired, but not connected.
If not successful, try to enter the pairing code again.

5. If the second try fails, unplug the ELM327 device dongle and start step 3 again.
Sometimes the pairing must be done within the first few (maybe 30) seconds
after the dongle is plugged in.

6. Successfully paired, you can turn your phone's Bluetooth Off, since
the LEAF Battery app will turn it On when needed.
You can now run the LEAF Battery app and you should see live data
in just a few seconds.

---------
Notes: If you have trouble, try to get with another LEAF Battery app user,
and see their system working on their car, try their system on your car,
try your phone with their ELM327 device, and finally try your ELM327 device again.

The most often problem is a stubborn ELM327-type clone device, even an
"identical" one from the same supplier. Sometimes you will get different
circuitry inside the device, or different firmware, in devices from the same vendor.

Clone firmware 1.5 is to be preferred, I think.
Genuine ELM327 devices have 1.4b as their latest version, I think.
Last edited by garygid on Wed May 15, 2013 8:08 am, edited 2 times in total.
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, sold in 2015
2010 Prius, 2014 silver Tesla S
Nissan EVSE, mod to 240/120v 16A
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

User avatar
garygid
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Posts: 12415
Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

Re: ELM327-type OBD Bluetooth devices for Android Apps

Sat May 18, 2013 6:20 am

The 4 common sizes of the ELM327-type clone:
(I will insert pictures soon.)

1. Mini

2. Short

3. Medium (or Stubby)

4. Long
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, sold in 2015
2010 Prius, 2014 silver Tesla S
Nissan EVSE, mod to 240/120v 16A
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

User avatar
garygid
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Posts: 12415
Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

Re: ELM327-type OBD Bluetooth devices for Android Apps

Sat May 18, 2013 6:32 am

Opening the Medium (Stubby) and Long devices is
quite easy:

1. Cut 4 holes in the label, one over each screw head.
A sharp, pointed eXacto type blade (in the proper handle)
usually works quite well.
(pictures coming soon)

2. With a medium Philips screwdriver, unscrew all 4 screws,
and lift the cover straight up off the body and connector.

3. Inside, there is usually a 1x8? connector plugged into
the board, with wires going to the solder-side of the pins
of the OBD connector.

4. The 1x8? connector is usually easy to disconnect
from the board. Notice or mark its orientation so that
you can get it plugged back in correctly.

5. The OBD connector lifts out easily, and then all the
pins (and the wires to them) are easily accessed.
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, sold in 2015
2010 Prius, 2014 silver Tesla S
Nissan EVSE, mod to 240/120v 16A
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

LEAFfan
Posts: 4826
Joined: Fri Apr 23, 2010 6:08 pm
Delivery Date: 08 Jun 2011
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Re: ELM327-type OBD Bluetooth devices for Android Apps

Sat May 18, 2013 11:19 am

Gary, could you please put your link from your previous post (or repost) on how to install a DPDT sliding switch? Thanks!
2013 LEAF SV Del. 2/28/13
2013 LEAF World Record for Most Miles Driven On One Charge-188 miles/8.8 m/kW h
4.8 kW DC PV ($ .91/W fully installed)/ Dec., 2010

User avatar
garygid
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Re: ELM327-type OBD Bluetooth devices for Android Apps

Sat May 18, 2013 1:15 pm

First comes the hard part.

With a 2 pole double throw switch, possibly a slide switch because it typically
has a much lower profile inside the case, try to figure where to mount it
so that it does not block the Bluetooth antenna, and is clear of the inside circuitry.
Also, it should be located where you can operate it while the device is plugged in.

No, I do not yet have a good suggestion for this part.

---------
Each side of the double throw switch has pin 1, a common (pin 2) , and pin 3.
Call the two sides of the switch A and B.

The wire going to pin 14 should be disconnected from pin 14 and connected to A2.
The wire going to pin 6 should be disconnected from pin 6 and connected to B2.

Connect A1 to pin 14, and then connect A3 to pin 12.
Connect B1 to pin 6, and then connect B3 to pin 13.

Check your work, mount the switch, re-assemble, and check your work
again before re-installing the cover on the ELM327-type device.

--------
If you had a 3-position (sometimes called On-Off-On) , 3-pole switch,
ou could wire the Off position to turn the power off, so you could have
EV-CAN, Off, and CAR-CAN.
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, sold in 2015
2010 Prius, 2014 silver Tesla S
Nissan EVSE, mod to 240/120v 16A
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

Stoaty
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Re: ELM327-type OBD Bluetooth devices for Android Apps

Sun May 19, 2013 10:54 am

I would like to get some feedback about whether this statement in the Wiki (under Precautions) is still the best description:

"There is conflicting information about whether leaving the ELM327 scanner plugged in draws enough current to run down the 12 volt battery. There are a couple of reports of batteries going down to 8 volts when the scanner was plugged in overnight. However, one of the reporters did more testing and concluded that the problem was related to having the ELM327 plugged in and having the phone on with the Leaf Battery Application running and communicating with the scanner. When he exited the Leaf Battery Application, he found no significant decrease in voltage for the 12 volt battery (the OBD port does not run off the traction battery)."

I have left me ELM327 plugged in for a couple of days (phone was not connected with scanner, Leaf battery app was not running) without problems. Is there a consensus that the ELM327 can be left plugged in as long as it isn't communicating with the phone? Suggestions for revising this portion of the Wiki?
2011 Leaf with 62,000 miles given to Nephew
2013 Tesla Model S85 with 251 miles rated range at full charge
Leaf Spy Manual
Battery Aging Model Spreadsheet

thimel
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Joined: Fri Apr 23, 2010 6:10 pm
Delivery Date: 11 Jun 2011
Location: SF bay area

Re: ELM327-type OBD Bluetooth devices for Android Apps

Sun May 19, 2013 11:00 am

I've left my ELM327 clone plugged in continuously for weeks without any problem. I do drive and charge my car every day though.
I intend to unplug it if I leave the car for multiple days.

LEAFfan
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Joined: Fri Apr 23, 2010 6:08 pm
Delivery Date: 08 Jun 2011
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Location: Phoenix Area

Re: ELM327-type OBD Bluetooth devices for Android Apps

Sun May 19, 2013 12:00 pm

Over a week now plugged in with no change in battery voltage. However, I drive it almost every day so I'm not sure about long term without driving it at least every other day. I plan on installing a sliding switch and switching the always on wire.
2013 LEAF SV Del. 2/28/13
2013 LEAF World Record for Most Miles Driven On One Charge-188 miles/8.8 m/kW h
4.8 kW DC PV ($ .91/W fully installed)/ Dec., 2010

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