I created a simple LED circuit with a Reed switch to show when my garage door is open. I used a simple LED (2VF), with a 680 ohm resistor. My power supply is 12v. This works well with the switch (switch is normally open when door is shut). Garage door goes up, magnet leaves the reed switch and the circuit is activated. Light goes on.
I would like to add to this simple circuit. I want to add a small beep that goes off every 15-30 seconds, relatively soft, and lasts for about 0.5 sec to 1.0 seconds in duration. I have piezo speaker (5v) and some capacitors, resistors, and a 555 chip. I cannot quite find a circuit that does what I want.
If I can make it so that the LED is constantly on when activated then I would prefer that, but if it is simpler to have it flash then that is ok too.
So can anyone help me with the schematic for the additional timed beep? Also can I soften the speaker with resistors or something else?
Thanks.
Jeff
I would like to add to this simple circuit. I want to add a small beep that goes off every 15-30 seconds, relatively soft, and lasts for about 0.5 sec to 1.0 seconds in duration. I have piezo speaker (5v) and some capacitors, resistors, and a 555 chip. I cannot quite find a circuit that does what I want.
If I can make it so that the LED is constantly on when activated then I would prefer that, but if it is simpler to have it flash then that is ok too.
So can anyone help me with the schematic for the additional timed beep? Also can I soften the speaker with resistors or something else?
Thanks.
Jeff