Hello Berylius,

Thank you for working on the OM-D interface! I have had so many issues with my Stellarmate OS lately that I was about to give up on it. I found out my Pi B+ I bought in December was defective which added to my frustrations. After replacing the board and reloading the Stelarmate OS I am now having more success with testing. Tonight I was able to get bulb mode working with my OM-D E-M5. I was also able to get this working after downloading just the Stellarmate updates, so the bulb mode fix seems to be in place in the regular updates. Anyway if you have luck with the Pentax interface, then I will be beyond ecstatic!



berylius wrote: Hi,

If you want to try it, it has been merged into the official repository ( github.com/gphoto/libgphoto2/pull/394 )


Thank you for getting this completed. What is the package name to update the libghoto2 ? I tried the following> "sudo apt-get install libghpoto2" but I think the package name must be different on Stellarmate.


knro wrote: Hello Derek,

This is what the "Shutter Release Port" is for in the GPhoto driver. Just find out what port the serial shutter release port is using and put that in. Is it /dev/ttyUSB0 or 1 or something else? what does <strong>dmesg</strong> say when you insert the cable?

Hello Jasem,

I think I am mis-understanding the serial part function after researching the issue in other astro software platforms. It seems the serial port release also requires a camera to be connected and detected. I am trying to use very basic functionality for EKOS. I do not want Ekos to control my camera or even connect to my camera.

I want to use Ekos in the following manner:
1. Connect to guide camera for autoguiding
2. Contect to a serial port which will control the camera like an intervalometer. The camera is only connected by the remote shutter port. No USB connection from the camera to the Stellarmate.
3. Telescope Connection.
4. SkySafari relay

I'm not sure if it is possible after my experimenting. I really just want my StelarMate to run like an MGEN2 would. The MGEN2 will guide and dither because it has a remote shutter release port. It is very simple.

I get a message indicating the serial port is connected to ttyUSB0. I've attached a screen capture.

I also tried connecting a Nikon point and shoot to see if it would work with serial port. The camera connects and Ekos fires the camera, but does not trigger the serial port even though i configured it. I have a feeling the serial port option may only work with certain Canon or Nikon DSLRs.

Clear Skies!


Hello Jasem,

Does Ekos support the serial shutter if a camera in not connected via USB? I just want to simplify things by using Ekos to Guide, Dither, and Trigger the shutter release with a USB serial cable. I thought from the description for Gphoto2 it would do this, but after some tinkering I see it does not which is why it is not detecting my serial release. My Olympus only has 1 USB port which can either be used for a computer connection or a remote shutter release, so I cannot do both at the same time.

Is there a way to add a stand alone serial shutter control to Ekos without having a camera connected?


knro wrote: The error message is that the camera is not getting detected to begin with. Try to install GPhoto2 and test the capture.
sudo apt-get -y install gphoto2

gphoto2 --debug --debug-logfile=gphoto.txt --summary

Does it detect it?

It comes up :

*** Error: No Camera found. ***

I do not have a camera connected, only a USB serial port with the opto-isolated serial to shutter release. I have attached the diagram of what I built. My Stellarmate Pi is detecting the USB port from what I can see. I ran ls /dev and I see the follwing:

Bus 001 Device 008: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
Bus 001 Device 007: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC

My USB comm port has 2 separate ports and they both populate the list. Is there something in Gphoto2 I need to enable so it looks for the USB serial as a camera?


berylius wrote: Hi,

It's working so far. The only thing is you have to take the shots in "Native" format, in "Fits" it's not working the driver is crashing during the "subframing" process (I suppose).
I'll make a Pull Request on the libgphoto2.


Awesome, thank you so much for working on this! I prefer to use the native format, so the FITS conversion is not a big deal to me.

Is there a way I can try this out? Would I just update libgphoto2? Are there any special items I need to know to test this?


Derek S Dailey replied to the topic 'GPS NMEA Bluetooth' in the forum. 1 year ago

This helped me out with a BT GPS that I have! Thank you!


I plan on making the opto-isolated circuit on this website when I get this working: www.beskeen.com/projects/dslr_serial/dslr_serial.shtml

Does Ekos need to see the circuit in order to detect the Comm port?



I am trying to setup a serial shutter release in Ekos using GPhoto (DSLR Cameras). When I try to connect to the serial cable I get the following error (attached picture):
Cannot Open Camera: Power OK?

In the info for GPhoto (DSLR Cameras) it show the following:

If your camera uses an external shutter release cable, make sure to indicate the port of the shutter release USB cable (usually /dev/ttyUSB0) in the Main Control tab of the GPhoto driver before connecting to the camera.

Additionaly, users may employ DSUSB/DSUSB2 from Shoestring Astronomy in order to control the shutter. Before you connect, the port field must be set to DSUSB.

I verified my Pi is seeing my USB Comm port and it is listed as /dev/ttyUSB0 when I have the terminal list devices.

Does anyone know what I could be doing wrong? I have not added the circuitry for the shutter release yet to the Comm port as I would like to verify GPHOTO sees the Comm port first.


Thank you for looking into this, Benjamin!