Need fast cheap laser rangefinder for your Arduino project? You can use a laser tape measure for this!
Project tutorial by iliasam
In my Arduino code char '\n' is used as a start event, so it is useless to write "if (rx_byte == 'A')".
It is needed to rewrite all Arduino code to get maximum speed. The best way is to use UART interrupts:
KEY 4 is calibration button. I have updated photo at the github: https://github.com/iliasam/Laser_tape_reverse_engineering/raw/master/PCB_photos/module_701A/PCB_top.jpg
The project had been written with IAR 7.50 IDE.
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