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Beginning Arduino ov7670 Camera Development?
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The RasPi is being suggested frequently because there are lots of existing resources that detail exactly exactly what you are wanting to do without trying to hack a consumer digital camera's interface and storage. You can use the RasPi examples as a guideline to use other less expensive SBC with power management to accomplish your goal (e.g. use the $15 Orange Pi). Using a minimal OS without all of the bloatware of a GUI reduces power consumption dramatically and some SBC do have power management features.
You can also use an Arduino or NodeMCU to interface with a RasPi Cam, an OV7670 or OV5640 camera module to do exactly what you want. A very well written book on using the Arduino and OV7670 camera module is Beginning Arduino ov7670 Camera Development
Why do you think the RasPi is limited to two sensors?
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