Hi folks, I'm new here. I took electronics in High School and College, but have been working largely outside of design for 25 years. That said, I'm really rusty. Like 1986 rusty.
Here's my project: I want to control a momentary switch with a toggle switch. I am basically replacing a DPDT switch with a SPST wireless relay and the relay will latch on the push of the remote button, and unlatch on pushing it again. I want to make it work the same way with a toggle switch. I was thinking a flip flop that issues a pulse every time the state of the input changes and is wired in place of the pushbutton on the wireless remote. The pushbutton pulls the ckt to gnd.
Operation:
Relay starts out unlatched when power is applied to ckt (Normal condition).
flip toggle switch to "ON" and circuit pulls a line to GND for a few mS then goes high/float.
Nothing happens so long as the toggle is left "on".
When toggle switch is flipped "off" the circuit pulls the same line to GND again for a few mS, then goes high/float.
On the other end of the wireless system, the relay turns on and off as if the switch is hardwired to the coil.
Yes, I could just push a momentary button to toggle the thing on and off, but I want to use the other pole on the toggle to light up an "enable" LED. (This is for a remote rocket launch pad) and I could put a latch ckt to toggle the LED on and off, but the main thing is to still have the toggle switch work like a toggle switch.
That way, if the switch is up (on) the pad is armed and the LED on the console is On, and if it is down (off) the pad is safe and the LED on the console is off. It needs to be idiot proof for users who don't understand anything other than on off switches.
I'm digging through my old notes, and my usual pile of Forrest Mimms books, but cannot find exactly what I'm looking for. I was thinking some sort of one-shot, but they all seem to work on the single input pulse only. Perhaps some sort of RS flip flop...
I would just use toggles in place of the momentary buttons, but if you hold one down, the others are disabled/locked out. You cannot energize multiple relays (there are 4 on this unit) at the same time. Kinda put a kink in my original design.
Any suggestions?