Security: How can I ensure that another tag cannot "hijack" the platform?
Because it's for indoor use, there's no encryption done for security.
How can I implement TDoA (Time Difference of Arrival)? How is time synchronization handled?
This has algorithms within the module to implement TDOA as well as handle time synchronization.
Is it possible to use 4 anchors (with one tag only) with your ready-made solution? (I assume there should be master and slave settings)
At the moment we only have the 3 anchors and one label scenario, 3 anchors are enough to set up the coordinate system. 4 anchors are possible but you need to set it up in the code.
Can I set up 4 anchors on a 1000x400mm platform with the tag positioned outside of this platform? What accuracy can I expect? I need to understand how to navigate the platform?
It is possible to place the label outside the platform, but the range you have set is too small, our minimum error will be around 100mm, it is recommended to use it for a wider range, we have set a standard of 50m range.
Code uploaded black screen, burned firmware also black screen (hardware is 3.0)?
Refer to the burning tutorial (https://forum.elecrow.com/discussion/comment/1757#Comment_1757) to re-burn the program, if re-burning the firmware is also useless, you can contact customer service to reissue the product.
Can it be used with GY-271 and MAX6675K?
It is also possible that I2C sensors can be used with pins 37 and 38 to simulate I2C signals.https://www.arduino.cc/reference/en/libraries/softi2c/，
But SPI doesn't work, not enough pins.
Can it be used for pi4?
The official Raspberry Pi 5 adapter has a protocol, except for the Raspberry Pi 5 with a protocol, all other models do not have a protocol, so other Raspberry Pi models will not have power output when connected to the official Raspberry Pi 5 adapter. Including the adapter we provide to power the Raspberry Pi 5 is the same.
How to use UART?
The 4.3, 5, and 7 inches use a 16-bit parallel transfer method using the normal GPIO port. For detailed information, you can refer to this lesson:
：https://www.youtube.com/watch?v=xZ9ULrg2EXw
What's the typical current draw of this display in milliamps?
600ma 5V
How does touch work?
The function of touch function is provided by lovyanGFX library, the code we provided inside is just to match the used IO port with the touch driver interface provided by the library, the code about the touch function can be found in the library author's Github:
https://github.com/lovyan03/LovyanGFX/blob/master/src/lgfx/v1/touch/Touch_GT911.cpp