Author Options:

beep-beep-beep-beep Answered

Hello all... I am new to this website and I am wondering if any of you can help me out. A buddy of mine is trying to replicate this little gadget that he had purchased some time ago. Since that time, the creator of this little device, has passed away. Therefore, my buddy is unable to purchase anymore of the device. So, I am trying to see how difficult it would be to build it from scratch. It seems to be fairly simple as it only has one function. The device is small enough to fit in a pocket and has a button on the exterior side. When the button is pressed, the device emits a series of short beeps four times. There is about a one second pause between each set of beeps. The beeps sound similar to that of a digital watch alarm or when you leave your car door open with the key in the ignition. Here is the pattern of the beeps... 1. beep-beep-beep-beep - 1 sec. pause 2. beep-beep-beep-beep - 1 sec. pause 3. beep-beep-beep-beep - 1 sec. pause 4. beep-beep-beep-beep I have attached a few images of the device and I am hoping anybody with knowledge, experience, or ideas of an alternate way of replicating this device and it's function will reply ASAP... The beeping will need to be loud enough for other people to hear it when the button is pushed inside a pocket. Thanks in advance for any help or ideas...


There is a device instructable that is somewhat similar to this on the MAKE site from MAKE mag. I am in the process of working out a few part acquisitions at the moment, but it is merely a 555 timer, a matched pair of transistors (NPN small signal, common), and a few resisters and capacitors. It emits an annoying sound for a few seconds, and then shuts of for a few minutes. Depending on the resistor / capacitor configuration, the times can be varied. As has already been asked, what is written on the IC (black square with 8 pins) at the bottom of the last picture? Is it a 555?

. A quick search for the schematic didn't work. :( . If you can identify the IC (the black rectangle with 8 legs below the minus sign for the battery), someone here can probably reverse-engineer it for you. It's probably a timer (eg, the 555 Kiteman mentioned).

There are some projects that might help (Click this link).

A 555 timer chip may be persuaded to do the job, but I guessing that your best bet is to look into something programmable, like a Picaxe or Arduino, simply because you have very specific requirements regarding the pattern of beeps.

(Oh, and welcome to the site, by the way)