DIY Digital Clock + Temperature

Today, there is nothing to program again - let us content ourselves with a PCB for soldering the components. Please calculate with about 3 hours of time, until the alarm clock can also be set correctly and taken with 5V in service.

What Do You Get

When ordering this kit from the Far East you will receive both the PCB and the necessary components, as well as a transparent case with a few screws for fixation.

The components are complete except for a 3V (CR1220) button cell battery. Also a short USB cable for the necessary 5V power supply is included. The 3V voltage temporarily stores the setting.

The round sticker additionally signals the expected display color: here you can see a white dot on the bag. There are many more display colors available: pay attention to this when ordering.

PCB

The designations of the PCB are clearly readable and lead to a rapid allocation of the components. Only with the Capacitors I checked the printed numbers with the help of a magnifying glass again: the slightly larger 104 is only 1x to solder, of the 22 are 2 necessary.

Do not ask me why the identifiers P1 and P3 are necessary: the structure works without these two components.

Nice Presentation

With the simple trick over a darkened slide over the 4 individual 7-segment displays over it, the presentation is very clear and without interruption.

Material

In addition to an optional cup of coffee, you'll need a small cross-head screwdriver for the Case's screws, a soldering station, solder and a pair of scissors / knife to shorten the film.

Case

If the test works after soldering, the film can be rubbed off the case, which requires a lot of patience. Also dealing with the 6 parts of the mating and the insertion of the small screws takes time. Unscrew the nut before putting more pieces together. This gives the case a little more grip.

Further Assistance

Provided by the photographed instructions in English.

And the link to the Far East with further pictures with details and ideas for a colorful folding case.

If you've soldered the IC sockets "wrong" around (I mean the notch - half the oval on one side) this is not bad, but make sure that the IC itself with the rounded point in the right direction into the socket is put into it. The socket is just an adapter, the logic comes from the IC.

I wish you success!