The attachment is a test program written using ch55xduino. After the hex is burned, the upper and lower case key lights will flash wildly.
The plate thickness is 0.8, and the shape has been verified
Please recommend a wireless chip that can be put in. I have recommended nrf24l01 before, but it seems that the peripheral circuit cannot be put in. I have a7106 and esp8285 chips on hand = = but I can’t draw RF circuits.
The bootloader still uses this
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