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IR-LOCK simply does not work, hard to get support - please help

I installed IR-LOCK on 3DR Solo running openSolo + ArduCopter 4.0.3
The I2C is connected to the bus the battery is using and the bus is OK, checked and re-checked for continuity.
I followed this guide:

The IC_LOCK’s LED is dimly RED (which responds to MarkOne by increasing intensity )and I have tried all three PLND_BUS options. logs are here:

I do not know how/when data is supposed to be logged. (in a specific mode, or always, like any other sensor.)
All “test-flights” are done indoors, no props, over a “MarkOne Beacon V3.0”

Do you have a rangefinder installed?

No, no rangefinder.
I also connected an logic analyzer to the I2C of PIXY-IR,and I can observe BMS and other traffic, but I see no attempts to communicate with 0x54 (I2C address of PIXY-IR, according to source code in Ardupilot)
Also, this is regardless of PLND_BUS selection.

I have also enabled the “precision loiter” by RC6_OPTION=39 (and I’ve made RC6 go from 1000…2000) - tested by graphing that RC channel.

Rangefinder is mandatory. It is written on the very first line of documentation.


@Corrado_Steri is correct. The rangefinder is required.

This is stated in the first section of the IR-LOCK tutorial, as well as the first line of the AC Wiki. Always read the docs first :wink:

so… the device is not being polled unless a rangefinder is present? - this is a huge facepalm, I stopped at “this does not work”

@Andre-K, the IR lock basically outputs the general 2-D “direction” of the landing target. The device itself does not need a rangefinder to work… but to get the approximate 3D location of the landing target, we’d need a range finder. Inside the code, we can probably use the barometer alt as well for this, but then the landing will not be precise. If you do not want to use a range finder, the only option at the moment is to use LANDING_TARGET mavlink message, with the DISTANCE field filled in.

So, I updated the log directory with three new logs.
All using a rangefiner. - and PLND_BUS -1 ,1 and 2 setting (with reboot inbetween)
Yes, the rangefinder is noisy when motors are on, I’ll add some shielding to help that - but this is not the issue right now, the main issue is that the PIXY_IR does not provide any data.

I might have been thrown off by a logging issue in 4.0.3 ?

but if I upgrade, it seems recent versions have another bug, that is corrected here:

What would be a known good, well working ArduCopter version for LOCK-IR ?

The Precision Landing feature has worked in ArduCopter for many years now (and versions).

Your comm status still shows a PL.Heal of 0, so you have a connection or parameter/setup issue.

Send screenshots of your sensor parameters (click ‘gear’ icon in Pixymon). That will not verify the wiring, but I can check the sensor params.

We have had irlock working since 3 years ago on every released firmware. Maybe they made it better lately but has been working fine on 3 years old firmwares for us. So i think you have it misconfigured or misconnected somehow.

Please see attached screenshots of configuration. (49.3 KB)
The one setting I am not sure about, is PLND_BUS (So I am testing both 1,and two)
I also tried current release candidate Copter 4.1.0-rc2 - no joy.

As for connection:
The SF11C lidar is connected using I2C to the SDA/SCL pads of the IDC connecotor of teh PIXY-IR board.
SF11 Works, and I also see I2C traffic from the Solo battery and other devices on those pins.
SCL/SDA is verified to not be swapped, but if they were, the whole I2C bus would be down.

@Andre-K Based on your screenshots, you still haven’t followed all of the tutorial steps.

Please see ‘restore default parameter values’ in Step[1] of tutorial pictured below.

The docs/tutorial is your friend :wink:

(also, if you are still having comm issues after following the IR-LOCK tutorial, I would recommend not also putting the rangefinder on the I2C bus)


Hi @ThomasSFL,
I remember with my experiments, I had followed the “restore default parameter values” step.
The data out port was still = 0 (which seems to be the case for @Andre-K"
Setting it to 1 immediately fixed the problem. We should document this,
“Users facing problem with IRLOCK connection should check if the data out port is = 1”

@rishabsingh3003 If you have the correct firmware installed (from IR-LOCK tutorial), then ‘restore default parameter values’ will definitely change the data out port. You can test and verify this with the correct sensor firmware.

If you do not have the correct firmware installed, then it will not change the data out port. (or it may even change it to ‘0’, if it was manually set to ‘1’)


@ThomasSFL We certainly did the “restore default parameter values” Also, If I remember correctly, doing so made the video much darker.

Will set the “data out port = 1” tomorrow.

As @rishabsingh3003 - says, please do not get to eager on the “RTFM” approach :slight_smile: and try to investigate that possible bug.

Does the rest of the values look good?

@Andre-K If you install the correct sensor firmware (from the tutorial), and then click ‘restore default parameter values’, it will definitely change the data out to I2C. The order of instructions in the tutorial is important.

After you complete this process, let me know what happens. Send screenshots of the sensor params again.

As we know, the documentation is a frustrating mess.
Dear @ThomasSFL
if you enter:
you see “2.0” in the URL… and “latest” in upper right corner-
then you scroll down to " Sensor Firmware & Software"
…and the URL is no longer mentioning 2.0
but then I get to see two links that lead to “
clicking on those, brings me un-intuitively to
…feels like I have navigated away from the 2.0 which I was asked to use…

now I see PC software and Firmware for Markone 1.0.1 - NOT IR-Lock.
Screenshot from 2021-09-16 19-25-59

and the text says “Use the dropdown menu at the top-right to ensure that you are using the latest version of this documentation. (v2.0)” - which seems to be long gone.

This is probably fine for you, as you know exactly what you need, for for a new customer, this is confusing, expensive(in terms of hours) and very annoying.

Can we please cut to the case, and provide me with a link to the correct firmware for PIXY-IR, (if the one we’ve used is wrong)

This is the file-link we used - found on the webpage after hopping thru hoops.:

@Andre-K Other users follow the tutorial just fine.

Just slow down and read each sentence one-by-one. If you need clarification on a particular instruction, feel free to ask.

@ThomasSFL Can I have clarification of the exact place/URL to the firmware for the IR_LOCK ? - the one that apparently is somehow different and set the communication parameter correctly?

By any chance; the place that contain the software, has a title saying “IR-Lock Firmware” - not a link, and then MarkOne_1.0.1.hex firmware…
We have MarkOne 3.0
Is that Markone_1.0.1.hex firmware for some/older MarkOne, or is it oddly named IR_LOCK firmware that hints that it is looking for use with MarkOne ?
This is ambiguous at best, but this is the other possible source of firmware I see.

Screenshot from 2021-09-17 08-36-30

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