Convert Your Old iPhone Into A Clock

If you have an old iPhone, you can turn it into a clock by installing a JAVA clock app.

If the original battery is no longer functional, you can install a 4S battery and find a case to hold it. The inner dimensions of the case should be slightly wider than the phone, so you might need to shave off a little bit with a blade to fit the phone snugly inside. This way, you won’t need to look for a stand for support.

One of the phone's original speaker holes can be used to connect an external battery, while the other can be used for an external USB power source. Since the external battery doesn't last long, you'll generally want to use USB power instead.

The actual speaker is located at the earpiece position. To make the sound louder, use the external speaker; for lower sound, use the earpiece. This is a cost-effective method.

A hole was drilled in the back of the case to run a USB cable through.

To save power, adjust the phone's brightness to the lowest setting and turn on airplane mode. At night, it won’t appear too dim. In terms of power consumption, you can measure it yourself if you have the tools.

If you need a clock app, you can search for "Full Screen Clock BigClock v1.22". If you have an Android phone, it will be easier to find the app.

Since I don't want to keep charging the device, I'm using a charger for power. The battery doesn’t hold a charge well, and this phone requires a soldered battery to power on. From a practical perspective, it's best to use a long-term external power supply, similar to how you’d use a microcontroller for a clock.