I am now doing a project which using PIC16F877A to create an ultrasonic range finder.
When I receive signal from receiver, i need a device to trigger "active low" to send the signal to PIC immediately.
Is there any suggestion of device for example transistor, relay or any thing that is fast enough with minimum delay?
Post a schematic of the 'receiver' if you can. It's unclear whether 'receiver' means the ultrasonic transducer itself or the signal processing circuit which responds to the transducer output.