How do you plan to actuate the door? If a switch, the switch shown is a standard switch that charges the cap when the 555 is off. If you use a low-leakage capacitor (like a ceramic cap), it takes no power, Small modification to a DPDT switch will prevent all drain on a battery (after the tiny current to charge the cap) and no other losses through the transistor base.

Or do you need a hands-free way to turn this on from a simple spst switch?

 

This works. Make sure to use a regular diode on the left 555's output as shown.

The amount of time the first one is on can determine how long the second one stays at the lowest frequency. Current values are set for about 1 second. The 1.25Hz signal from the right 555 will start right after power is applied.

 

This works. Make sure to use a regular diode on the left 555's output as shown.

The amount of time the first one is on can determine how long the second one stays at the lowest frequency. Current values are set for about 1 second. The 1.25Hz signal from the right 555 will start right after power is applied.

View attachment 262045

Are you an electrical engineer?
Just wondering how you are quick to figure this out. It’s so cool. I’d like to get to that stage
This all works perfectly. The door is triggered but a DB momentary push button with paralleled holding contacts. Dpst limit switches kill the timing circuits.

 

This works. Make sure to use a regular diode on the left 555's output as shown.

The amount of time the first one is on can determine how long the second one stays at the lowest frequency. Current values are set for about 1 second. The 1.25Hz signal from the right 555 will start right after power is applied.

View attachment 262045

Circuit

 

Circuit

Here is a ladder logic for the control

 

The 555 chips are missing their power supply...

 

The 555 chips are missing their power supply...

View attachment 262056

That is intentional the line that the VCC of both chips are tied on next to those diodes that are energized once the push button is triggered and the holding contacts are enabled

 

The 555 chips are missing their power supply...

View attachment 262056

 

Now I see it. Let me take a look.

 

Please click the buttons and relays to add a name (function) for each button and relay - then repost.

 

The switch it pressed. Turns on relays and timing. Door moves changing limit switch state. Touches second limit switch and kills circuit. Press the same button and it goes in reverse turning on timing circuit and motor. Once back to the closed position the limit turns off the circuit again

 

I didn't go though the latch logic with the switches. The left 555 was getting triggered by the fact that a one-shot triggers on power-up. I'm guessing it is not triggering for some reason. Try adding a 100nF to 1uF cap as shown below.

Also, increase the bandwidth setting of your simulator to 10kHz (under general settings (gear symbol)) to make sure short pulses are caught by the simulator. I think default is 256Hz.

 

I didn't go though the latch logic with the switches. The left 555 was getting triggered by the fact that a one-shot triggers on power-up. I'm guessing it is not triggering for some reason. Try adding a 100nF to 1uF cap as shown below.

Also, increase the bandwidth setting of your simulator to 10kHz (under general settings (gear symbol)) to make sure short pulses are caught by the simulator. I think default is 256Hz.

View attachment 262070

Everything seems to work just fine and I switched it to 10 killerherts it still works

 

Everything seems to work just fine and I switched it to 10 killerherts it still works

So, the capacitor fixed it? Or are there more issues?

 

So, the capacitor fixed it? Or are there more issues?

The capacitor wasn’t even needed at work before that.