You could use RS232 in a half duplex arrangement. Receivers and transmitters at each end all share the line. The line sits at logic ‘1’.
To prevent collisions, the house could send a ‘0’ polling pulse to the tracker once every second. If the tracker had data to send it would be sent its ‘0’...
If your LED is switched on by taking the 555 o/p high, then you can keep the LED on by taking the 'trig' pin low.
If LED on when o/p is low then take 'thresh' pin low.
How about chopping your analogue waveform at a frequency that can handle its highest frequency component.
Then AC couple the resulting sqare wave with a capacitor to your logic circuitry and DC restore to your logic return.
Have you thought of using a microcontroller? If you arrange for its internal timer to increment successive registers, you can get a clock with a resolution of better than a millisecond and five registers will give you over 24hours. It will show relative or elapsed time - not true time.
This...
You mentioned your counter was not starting at zero, which prompted my reply - I assumed you were using a decade or binary counter.
But when I look at your first posting I see you mention 74LS76. It was not readily apparent to me (because I only use 4000 series CMOS) that the chip is a J K flip...
Use a light sensor circuit to give a pulse every time the strobe lights. Use that pulse to hold off triggering of a monostable (a pulse omission detector), or bias off an astable oscillator.
When the strobe fails, the monostable will fire or the oscillator will run.
melone,
You seem to be going to great lengths to prove that a scope is the best tool to use. Yet you don't know just what buzzly needs to measure - or why. Info that buzzly has not submitted is:
What range of frequencies? What accuracy? Is waveform important? Is it a one-off measurement, or...
melone,
You seem to be going to great lengths to prove that a scope is the best tool to use. Yet you don't know just what buzzly needs to measure - or why. Info that buzzly has not submitted is:
What range of frequencies? Is waveform important? Is it a one-off measurement, or for continuous...
One way would be to monitor your sensor with a frequency-sensitive device (eg. a 555 wired as a monostable triggered on succesive pulses). When this device sensed 1800Hz or higher, it would switch in a 1800Hz oscillator in place of the sensor output.
