If you do not like the opto in the circuit, then you have to get a 5 V tollerant Venus Fly Trap plant (very rare, very expensive, better to use the opto for level conversion....)
If you do not like the opto in the circuit, then you have to get a 5 V tollerant Venus Fly Trap plant (very rare, very expensive, better to use the opto for level conversion....)