Hi all. Recently for a stratospheric balloon project we use the time transmission to communicate and receive telemetry. Now I was wondering if it is possible to transmit video In very low resolution to the ground station via esp cam with lora? Or do you know other methods to be able to see streaming video at those distances?
You are only, ever, transmitting DATA, BYTES, you can determine yourself if it is possible or not. Compute the number of bytes per second that would be necessary to send the image data to your receiver. Can your system handle that number of bytes per second?
There is software to transmit individual images via LoRa from an ESP32CAM.
But that software is designed to transmit images or files error free, so it there is an error checking overhead that slows down the image transfer times. For pure streaming then that would be faster but parts of the image (or video) could be missing.
The software works on UHF SX127X, SX126X in LoRa mode and 2.4Ghz SX1280 in both LoRa and FLRC mode, and although 2.4Ghz LoRa\FLRC does not have the range\distance of UHF LoRa its a good deal faster.
https://stuartsprojects.github.io/2021/11/12/StuartCAM-LoRa-Remote-Camera-Image-Transfer.html
https://stuartsprojects.github.io/2021/11/21/StuartCAM-ESP32CAM-Picture-Transfers-with-LoRa.html
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I have been working on some additions to the image\file transfer software mentioned above. When the ESP32CAM TX Arduino wants to send an image it notifies the receiver which then responds with the LoRa settings to use for the transfer. These settings can be configured on the receiver with a PC and serial terminal or Android phone. Adjusting the LoRa settings for the transfer allows for fast settings for local use and slow settings for long distance use.
What would be good is if a Slow Scan TV setup could be used, whereby the lost or error packets would not result in no valid images. In this way potentially anyone could receive the images (with bits missing maybe) rather than the single receiver approach in the software mentioned above.
The UKHAS guys do use SSTV to send images via LoRa, the TX is a Raspberry Pi and multiple receivers report packets received to an Internet server which compiles the final image.
An Arduino to Arduino SSTV setup, over LoRa would be real good, but not seen one yet.
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