I'm working on a circuit to replace a wired remote control unit with an RF remote. The existing remote is nothing more than 3 push buttons that connect a 5V supply voltage to ground via a 470 ohm resistor (remote connected via some RJ-11 connectors and a phone cord. The buttons are UP count, Down Count, and Reset.
I'm having some trouble interfacing the RF remote circuitry with the wired remote interface. My plan is to use 3 SSR's in place of the existing push button switches. The RF remote works great, and lights up test LED's just as I would expect when push buttons on the transmitter are pushed. My next step was to replace the LED's with the SSRs. I chose the SHARP PR22MA11NTZF to do the job. I connected pin 2 to ground, and 1 to my output. Then I hooked up pin 6 and 4 to my continuity tester and hit the buttons on my transmitter. Everything looked like it was going smoothly. The SSR was behaving just like the switch. When I held the buttons down, I got a solid buzz, when i hit them fast, i got short blips. Then I replaced the continuity tester with the wires I wanted to short (+5V from the circuit i am driving, and Gnd (via a 470 ohm resistor).
Here is where my problem was noticable. I push the button one time, it latches the SSR, causes the circuit to count as expected, but then never unlatches, so even after i release the button my circuit keeps counting. I'm assuming I have either chosen the wrong SSR, or need different circuitry somewhere as it behaves as if the current flowing through the SSR after the initial button press is holding the switch on, when I want it to turn off when the drive logic turns off.
Any ideas? If someone could point me in the right direction for a more appropriate SSR, or SSR circuitry that would be great. Thank you in advance for any assistance you can provide.