JKJoy
Member level 1
Hello,
I am designing a circuit to detect telephone ring, to output a flashing light with 2flash/second as long as the other end goes ON-hook. So the flash works for 4-6 seconds in the ring interval(gap between each ring) also, since I dont know if there is next ring coming. I use PIC microcontroller for delay and control. It works fine.
But I feel it awkward to flash 4-6 seconds, even after the other end is gone off-hook.
So my question is, if there any signal change in the phone line which I can detect to stop flashing the very moment the other end phone goes ON-Hook, during ring silence time.
Thanks.
I am designing a circuit to detect telephone ring, to output a flashing light with 2flash/second as long as the other end goes ON-hook. So the flash works for 4-6 seconds in the ring interval(gap between each ring) also, since I dont know if there is next ring coming. I use PIC microcontroller for delay and control. It works fine.
But I feel it awkward to flash 4-6 seconds, even after the other end is gone off-hook.
So my question is, if there any signal change in the phone line which I can detect to stop flashing the very moment the other end phone goes ON-Hook, during ring silence time.
Thanks.