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Bite indicator

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I still have no idea what you're talking about. Try a better description.

Mike.
 
I am talking about an alarm that sounds when jou have a bite on your fishing rod. The alarm will go off as well as a led will flash.
 
The circuit is fairly simple. What are you going to use to trigger it? What kind of sensor is there on the fishing line or rod?

also, what is your sklil set? Can you assemble a small circuit on perf-board, or are you looking for pre-assembled modules to wire together?

ak
 
So we've gone from flashing LEDs to an audio alarm. Describe exactly what it does.

Mike.
P.S. we're not fishermen.
 
Will the switch open when there is a bite, or close when there is a bite?

BTW, the name of this site is not "20 Questions". Please provide all of the information we need to suggest a solution.

ak
 
You want an alarm to sound breifly) when the switch is triggered and an led to continue to flash until cancelled?
 
I wii use a small wheel with magnet on wheel. The magnet triggers the alarm when rotating past the reed switch. If the wheel stops rotating the led must still flash for a few seconds.
 
That changes things. The reel can stop with the magnet near or away from the switch, so what you want is an AC-coupled missing-pulse detector (retriggerable monostable multivibrator), gating an oscillator, driving an LED and beeper.

A fun part for something like this is a flashing LED, an LED with a flasher circuit built in. One of these in series with a piezo beeper gets you both light and sound with very few parts. All that is needed is the monostable, which can be two small MOSFETS if you want to eschew integrated circuits.

ak
 
First pass at a fish bite alarm. The alarms sound whenever the reel moves, and stop approx. 4 seconds after the reel stops moving.

C1 differentiates the switch signal so the alarm will shut off no matter if the switch is open or closed when the reel stops moving.

D1-R3-C2 and the input to U1C form the retriggerable monostable.

R4-C3-U1C form a 3 Hz oscillator.

U1D inverts the logic polarity so that when the oscillator is disabled, the alarms are off.

Q1 drives the visual and audible alarms.

U1A is not used, but its inputs must be tied to a valid state.

ak
Fish-Bite-Alarm-1-c.gif
 
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