Tagged Questions
2
votes
3answers
128 views
how to create a square wave with large duration and high duty cycle
For a "plant waterer circuit" I would like to add a safety feature that prevents watering for over ~3 minutes, and delays the next watering from occurring for ~12 hours.
Currently the circuit is ...
5
votes
3answers
476 views
0-10 second on-time with a potentiometer
I would like to make a simple circuit, where the a potentiometer controls a 0 - 10 second on-time.
If the potentiometer is set to min, the on time should be 0 seconds. If the potentiometer is maxed ...
2
votes
2answers
95 views
Delay then off for tone signal
I have a simple circuit using a 555 timer as an oscillator to output a 12v tone to an intercom system. I'd like to make a delay circuit that will turn off the output of my circuit after a delay.
...
2
votes
1answer
207 views
Power Off Delay circuit
I'm looking for a timer that starts when power is removed.
Here is the use case:
The head light on dirt bike my turns off with the engine.
This good when it's parked.
This is very bad when doing ...
-1
votes
2answers
1k views
Creating 1 hour delay with 89C51 micro controller
I am writing an Assembly Program function for 89C51 which can create one hour delay. I can't use any other micro controller as only 89c51/52 is available locally. So I am stuck here because even when ...
4
votes
4answers
790 views
Maximum attainable delay with Micro controller
I am designing a microcontroller based delay circuit to implement delays of 2 hours, 1 hour, 45 minutes, and 30 minutes. The circuit will automatically turn on off a relay after this time period has ...
3
votes
4answers
341 views
Delayed power supply startup
I would like to make a circuit that turns on a power supply to a microcontroller after holding down a button for a period of time (say 2 seconds). To make matters slightly more complicated, if ...
