The Growtronix system supports many WiFi/IP Cameras. It also supports Pan/Tilt functionality. These cameras will not connect directly to a Growtronix network. Instead they will connect to your WiFi or router network and the Growtronix software will communicate with the cameras through.
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Most IP/WiFi Cameras can be used. We use Foscam brand cameras in our development. They have decent image quality and aren't very expensive. However, there are literally thousands of cameras that could be used.
Here are some cameras that are known to work easily with Growtronix:
There is a good website that lists all the camera manufacturers and once select displays all the camera models that are available. It lists the output types that are available. Generally as long as the camera model lists "JPEG" in the type column it can be used in the Growtronix software.