Hi folks,
If any body has successfully used 74HCT4040, frequency delimiter? I have a trouble how to read frequency in arduino.
regards,
73!! 4X6HP
delimiter
Do you mean pre-scaler?
See here:
The Arduino's internal Timer1 can do the same thing but has 16-bits output.
LarryD:
delimiter
Do you mean pre-scaler?
I mean HF frequency counter. To measure frequency between TRX and PA. I have 74HCT4040 and some PCB what operate HCT4040. On osciloscope i see the right "picture".
I mean HF frequency counter
How high a frequency?
Nicks examples will measure 5Mhz (the first one) 200khz (the second one).
Adding a 4040 would allow higher capability.
I've used a SN74LV8154 to do frequency counting before,
it has two 16 bit counters than can be daisy-chained together to
make a 32-bit counter, clocks upto 40MHz and has 8-bit wide
tri-state output bus which can be read while the unit is counting
without error as it latches the full counter values before outputing
any on the outputs. I coupled it to a shift-register (74HC299) to
read it in with fewer pins.
The SN74LV8154 is available both as DIP and SMT.
The problem with trying to read from a ripple counter is that
the outputs are moving targets, and there is skew so you can't
even read them simultaneously without risk of error - you are
limited to a divide-by-2-to-the-N functionality.