What can I expect I if connect several TTL outputs together?
Pull up's on all outputs and diodes cathode to output anode to common "Controlled" input, put a 4K7 pull up there too.@ Mike an OC output is open... until it's activated or it's inverted and low until activated when it becomes 'open'.Bob
Runaway Pancake gave you the right answer: run one resistor from the rail to the output bus; and then run 1 diode / module from the bus to the module's output pin. The output is low if any of the module outputs a low.
This eBay sensor has active high output.
QuoteThis eBay sensor has active high output.In that event, run each output, through a diode, to a common resistor to ground and take your signal from that resistor.The output is high if any of the output is high.