Hi,
I used to control Holograms from DSee Lab from an arduino, through the sync input jack (hologram in slave mode). This is quite simple: it's a rs485 serial communication. The protocol is the same than the one for their adapter to control their hologram from a PC and is available on their website. You just have to change the header according the hologram model: for exemple, it's 0xBB for DSee-65x2 holograms.
I just got a new model, the DS-50x and I've been surprised: they changed the serial communication type!! It's not rs485 anymore.
Analysing with an osciloscope, I've been able to understand the data. It's still the same protocol but the header is 0xB9. But the physical layer is totally different and I have no idea about what it is...
Is there anybody knowing such serial communication protocol?
Here are the specs I reverse engineered by having a look to the sync output (hologram in master mode) on the oscilloscope.
-First strange thing, it looks like the output is an open collector type: without receiver connected, you can't see anything on the output.
-with a rs485 receiver connected, I can see the communication on the oscilloscope, with the probe connected on the rs485 side. Here is a screenshot of one message:
The message must be 0xB9 0x01 0x01 0x00. I'm quite sure about this.
So a bit 1 is full period but with double the lenght of a bit 0
-On the sync input jack (TRS style): 0v between sleeve and tip, 5v between sleeve and ring!!!