Test of data transmission using laser torch (coded data transmission)

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Schematic diagram of laser torch:

Test circuit for data transmission using laser torch (encoding data transmission):

The circuit is composed of encoder VD5026 and laser torch. A1~A11 are address lines, whose logic state can be 1, 0 or suspended. Different combinations of address lines can get different pulse strings at the output D0 to modulate the emission of laser torch, that is, tens of thousands of different coded data can be transmitted through laser.

Encoding receiving circuit:

This reception is composed of the amplification and shaping circuit composed of photoelectric device and operational amplifier LM358, which sends the received signal to the input DI of VD5028 for decoding (the status of A1~A11 of VD5028 must be consistent with that of VD5026). When the decoding is correct, the low level is output at the VT end to trigger the following control execution circuit to make a sound.