Simple alarm from a mobile phone

If you have an old mobile phone with buttons lying around at home, then do not rush to throw it away.
In this article I will describe how you can make a mobile alarm from an old push-button mobile phone.

Where to start making?

First we need to configure the phone itself. In the phone settings, turn off all kinds of sounds and lights.
We turn off the auto-lock of the phone and put a speed dial number on button 2.

To assemble our mechanism, we will need ordinary things that are found in every home.
Materials:
1. Nail - it should be slightly longer than the phone itself, about 1.5 cm.
2. Mounting dowel - into which the nail fits without play but easily.
3. Squeeze spring - approximately 1.5 cm long.
4. Rubber band - To hold down the speed dial button.
5. Clothespin - we will use it to make a nail lifter.
6. And of course the mobile phone itself.

Alarm assembly instructions

1. First of all, cut the dowel into three parts.
The first part is to cut off the cap from the dowel about 1 cm long.
The second part - cut off part of the dowel about 2-2.5 cm long.
Third part - cut off part of the dowel about 0.5 cm long.

2.We clean the nail from irregularities and nicks with a regular needle file so that it can easily slide inside the cut out parts of the dowel.

3. Glue the parts of the dowel to the phone; for convenience, we use the same nail to glue them in one direction.
For convenience, I also used hot-melt glue as it quickly glues and dries, but you can use other suitable glue.

Glue the smallest part onto the button.
We glue the largest part at the top of the phone above the screen, use a nail to guide both parts and glue them along the same axis.

4. We put a dowel cap on the nail, and then a release spring, lubricate it with a drop of mechanical oil and insert the nail into the glued parts of the dowel on the phone. Thus, we have a primitive button that will play the main role of an alarm.

5. Cut off the tip of the clothespin and wipe the lifting path in the middle with a file or nail.

6. Glue this lift at the very bottom of the phone under the “0” button so that the tip of the nail barely touches the lift and is directed towards the lifting path.
7. We wrap a rubber band around the phone and a nail 4-5 turns opposite the “2” button so that it (the “2” button) is constantly pressed.

That's all, now when we press the primitive button of our mechanism, button “2” leaves the pressed state and nothing happens, but when we release the button of our primitive mechanism, button “2” will again be in the pressed state, thereby dialing the number