# Updating ESC firmware but no build.sh file

Source: https://forum.modalai.com/topic/4604/updating-esc-firmware-but-no-build-sh-file
Category: VOXL SDK and Software (https://forum.modalai.com/category/47/voxl-sdk-and-software)
Tags: voxl-sdk
Posted: 2025-07-17 14:10:28 UTC by JackHammer
Replies: 12 · Views: 1536

## JackHammer · 2025-07-17 14:10:28 UTC

The make_package.sh file in https://gitlab.com/voxl-public/voxl-sdk/utilities/voxl-esc/-/tree/master?ref_type=heads claims that build.sh needs to be run first but this script doesnt appear to be included? Can someone point me to where that would be? I am new to building debian packages so I may just be missing something simple.

## Reply by Alex Kushleyev (ModalAI staff) · 2025-07-17 14:32:03 UTC

@JackHammer , the instruction do not specify that `build.sh` is needed for this project.

![64a3bac0-4686-4020-9e72-7ca6e9ec54c6-image.png](https://forum.modalai.com/assets/uploads/files/1752762698865-64a3bac0-4686-4020-9e72-7ca6e9ec54c6-image.png)

## Reply by JackHammer · 2025-07-17 14:41:59 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev In the first few lines of the make_package.sh, it states that you must run build.sh first to build the binaries.

![5d2cfd2b-3e46-44e1-90bf-dd502f7c801c-image.png](https://forum.modalai.com/assets/uploads/files/1752763315410-5d2cfd2b-3e46-44e1-90bf-dd502f7c801c-image.png)

## Reply by Alex Kushleyev (ModalAI staff) · 2025-07-17 14:43:27 UTC (in reply to JackHammer)

@JackHammer , I see. thanks for clarifying. This is a copy / paste error. In this project, you don't need to build anything.

Alex

## Reply by JackHammer · 2025-07-17 14:46:12 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev Okay cool, thanks for letting me know. The instructions from that readme file state you dont need the voxl-cross image, but then the following instructions appear to use it. Do these instructions change at all when I am running through wsl? I am getting some error and I just want to be sure to cover my bases

## Reply by Alex Kushleyev (ModalAI staff) · 2025-07-17 14:53:11 UTC (in reply to JackHammer)

@JackHammer , it should just work out of the box:

```
voxl-esc$ ./make_package.sh 
Package Name:  voxl-esc
version Number:  1.5.4
[sudo] password for *******:
starting building Debian Package
dpkg-deb: building package 'voxl-esc' in 'voxl-esc_1.5.4_arm64.deb'.
DONE
```

 Note that `sudo` inside the script is not required, but it is there for historical reasons..

Alex

## Reply by JackHammer · 2025-07-17 14:56:50 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev Gotcha, it appears to start up an then right after the starting building line I get:

dpkg-deb: error: maintainer script 'postinst' has bad permissions 744 (must be >=0555 and <=0775)

## Reply by JackHammer · 2025-07-17 15:42:03 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev Got it working out of a docker container. I did have another question though. Do I need to remove anything off the voxl board (old voxl-esc package) before pushing this one over ssh?

## Reply by Alex Kushleyev (ModalAI staff) · 2025-07-17 16:02:34 UTC (in reply to JackHammer)

@JackHammer 

That error is weird, since 555 <= 744 <= 755. I think there is some issue with the leading 0 in the perms... Have not seen that before.

You should not have to remove the old `voxl-esc` package, all the files in the package will be overwritten.

I am assuming you are just making a custom version of the package? If not, you can always get the latest package from : http://voxl-packages.modalai.com/dists/qrb5165/dev/binary-arm64/

Alex

## Reply by JackHammer · 2025-07-17 17:45:00 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev No actually I was just trying to rebuild the latest version as support for the recent ESC I recieved was added just 2 months ago, and until I build and moved the package, I was unable to see it. Didnt realize that it was just online for me to download, thank you for that link.

The reason I got a new esc is because one of my coworkers crashed the drone and now the motors skip when we try to run voxl-esc spin . 3 of the motors are "iffy" and will skip a few times and sometimes spin normally while one of the motors just works fine. We received the new ESC, installed it, updated the voxl-esc package, and the odd behavior persists. We havent updated the parameters yet. 

We are wondering how do we get the correct parameters for our motor setup into the options for the drone? We can see 6 different options and none match our 2203 1500KV motors. They are black and there is an option that says black-motors but that feels incorrect?

Please advise.

## Reply by Alex Kushleyev (ModalAI staff) · 2025-07-17 17:50:05 UTC (in reply to JackHammer)

@JackHammer , can you please tell me which drone you have an post a picture of the motor just in case? I can point you to the correct parameters for your motor.

Alex

## Reply by JackHammer · 2025-07-17 18:06:12 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev We are running the starling 2 max drone with the 2203.5 KV1500 motors. The body is black with a gold/brass colored rim around the top edge of the rotor. I am not sure that I am able to take and post photos from inside the work place.

## Reply by Alex Kushleyev (ModalAI staff) · 2025-07-17 18:09:50 UTC (in reply to JackHammer)

@JackHammer no problem.

This should be the esc param file for the Starling 2 Max motor : https://gitlab.com/voxl-public/voxl-sdk/utilities/voxl-esc/-/blob/dev/voxl-esc-params/D0012_Starling_MAX/esc_params_m0129_f2203_5_1500kv_7x3.7x3.xml

The param file should also be present in `/usr/share/modalai/voxl-esc-params`

Do you know how to update the esc parameters?

```
systemctl stop voxl-px4
cd /usr/share/modalai/voxl-esc-tools
./voxl-esc-updload-params.py -p <full path to params file>
```

After updating the params, you can run a "power ramp test", as shown here : https://gitlab.com/voxl-public/voxl-sdk/utilities/voxl-esc/-/blob/dev/voxl-esc-tools/doc/low_kv_motor_tuning.md?ref_type=heads#power-ramp-test . Use id=255 to spin all motors (and you can limit power to 80%)
```
./voxl-esc-spin.py --id 255 --power 80 --ramp-time 3.0 --timeout 3.5 --enable-plot 1 --cmd-rate 250
```
Since you can't display the plot on voxl2, a plot will be saved as html, which you get download from voxl2 and view in a browser.

You can do it without propellers (for safety). If all the motors are working properly, the four rpms will be very close to the same as the power ramps  (within 100-200 rpm). Otherwise, you may have a bad motor that was damaged during the crash.

https://www.modalai.com/products/starling-2-max-replacement-parts?variant=49704826896688

Alex