Assembly diagram for a designer watch from China. Radio designer "electronic clock". Characteristics of electronic watches

I wonder if soldering parts onto a finished printed circuit board is considered amateur radio? Let's think so)) At least for beginners and dummies who proudly look at the recently assembled one, lying in a place of honor in the room and wondering if they will try something microcontroller, to the delight of their parents - to the envy of their friends! For such cases, the “Electronic clock with alarm clock and seconds countdown” constructor, which is sold on Aliexpress for a couple of hundred rubles, is perfect. Well, they interested me, because I plan to take them as a gift for my son’s 4th birthday. Let him delve into radio business from an early age))

The device is an electronic watch with alarm, stopwatch, countdown and counter functions. The AT89C2051 microcontroller is used at the heart of the design, which has greatly reduced the number of parts. In addition to the microcircuit, there is a quartz, a buzzer, 7 dynamic indication transistors and a bunch of binding resistors. There is no need to program anything - the controller is supplied already firmware.

Characteristics of electronic watches

Model: YL-6 C51
Digit capacity: six LED digits
Operating voltage: 7-12V
Current consumption: 10-20 mA
Board size: 92 x 50 mm
Accuracy less than 1 second per 24 hours
Features: Alarm, stopwatch, countdown and counter.

Pay attention to the high accuracy of the move - at home it is not easy to calibrate a crystal oscillator to such a value. This watch has almost 500 customer reviews (90% excellent), which says a lot! Here are a few photos of the finished watch from those who bought it and successfully launched it:

We will not provide a link to the page, this set is sold by several sellers, so choose for yourself using a request like C51 Digital Electronic Clock Suite DIY Kits Six 6 Bits Electronic Parts and Components Electronic Production. The approximate price is $3.6, and it will help you find the most profitable option

Greetings to all readers website!
In this article, I want to talk about such a thing as an electronic designer.

I want to say right away that those who think it’s cheaper to buy ready-made ones don’t have to read any further! This article is for those who are at least a little interested or interested in radio electronics. And also for those who decided to join this hobby.

I became interested in radio electronics while still a schoolboy. I assembled a detector radio and other primitive circuits. And then my father and I bought a Soviet electronic construction set Start 7176 “Electronic watch”.

I assembled them, but they didn’t work, either I messed something up, or some part turned out to not be working, but they never worked. It was insulting and annoying. But nevertheless, even this experience was very useful, and working with the designer was very educational.

And now, many years later, I came across the reviews (,) and decided to buy one for myself, choosing the green ones with the body.
I ordered it on the website. The parcel took 21 days, delivery is free, but without track. I received it at my post office, everything was as usual, without incident.

This item comes in the form of a small package.

Let's open it up and see what's inside.

Set contents
- Fee
- Seven-segment digital indicators with a dot - 4 pcs.
- Microcircuits - 2 pcs.
- Loose powder (resistors, capacitors, transistors, quartz, other elements)
- Power cable
- Body parts
- Instructions

The included instructions are in Chinese. This is enough for assembly (the circuit design language is the same for everyone), but there were problems with setup.

Build process
We will need:
- soldering iron;
- solder;
- side cutters;
- knife.

It is customary to start the assembly with passive elements (resistors, capacitors, buttons, etc.).
The set includes two types of resistors (510 and 4.7K), they are color coded. You can also use an ohmmeter. But in reality everything turned out to be much simpler, they were signed.

I placed the resistors according to the diagram so that they would not fall out and bend the contacts on the reverse side. Then I cut off the excess with side cutters and soldered everything in one fell swoop.

This photo shows the prepared resistor contacts and one row has already been soldered.

Soldered the buttons

Sockets for microcircuits, do not forget to check the correct position using the key (notch at one end of the socket).

Then capacitors, a diode, a tweeter and a connector for flashing the microcontroller. Here the soldering of the diode requires control, since it doesn’t care which side it is on!

It came down to transistors, quartz, a power connector and a battery socket. We check that the transistors are installed correctly, this is also important! Fortunately, this is all marked both on the diagram and on the board itself.

Everything, all the elements on this side are in place, all that remains is to solder in the digital segments. We put them in their places, don’t forget to turn one point up! And it also disappeared in one go.

That's it, the watch is assembled, drum roll, the moment of truth has come...
Connect to the power source... Hurray! It's working!

All that remains is to assemble the body. There are no instructions for this matter, we collect it using the selection method.

The clock is assembled and configured.
A couple of photos of the interior.

Setup instructions

Purpose of buttons and indicators
- the first two indicators are hours
- two second minute indicators
- two dots between them - counting seconds
- dot after minutes - alarm indicator (on/off)
- top button - Increment, increases the value
- bottom button - Functions, setting watch functions

Initial reset and testing
- turn on the clock
- press and hold the Increment button
- press and release the Function button
After this, the time on the clock will be set to 7:59 and after a few seconds it will change to 8:00, and the alarm will go off. To stop sound signal alarm, briefly press the Increment button.

Settings
The clock is set using the Functions button. Pressing it switches the watch to one of the setting modes in the following sequence:
- time setting, clock
- time setting, minutes
- setting alarm clock, clock
- alarm setting, minutes
- turn on/off the alarm clock
- setting the period of hourly signals, start in hours
- setting the period of hourly signals, end in hours
- turn on/off clock signals
- return to operating mode

In each mode, you can use the Increment button to change the set value. One short press adds one to the current value. In modes where you want to enable or disable the function, it turns it on or off, respectively.

Impressions from the designer
I really liked the set! It's a pleasure to collect. Pleased with the quality printed circuit board, very high quality made. All parts fit perfectly, no peeling was required. The clock started working immediately and has been ticking for several days. They shine very brightly, I placed them in the corridor.

Unfortunately, I ordered it literally a couple of days before its appearance. IN new version added a thermometer and brightness adjustment depending on the lighting.

In any case, as I said at the very beginning, this constructor is for those who want to make electronic device with your own hands. As they say, anyone can buy a ready-made device in a store, but assembling a gadget with your own hands is a completely different matter. In addition, this is a great gift for a teenager who is interested in electronics. I recommend!

PS: My wife really liked the watch. She said order another one, white with brightness adjustment, we’ll put it in the room.

I'm planning to buy +38 Add to favorites I liked the review +26 +50

I was going to make myself a small table clock. There are already enough clocks in the house, but in the dark you need to turn on the light, etc., to find out the time. This means we needed a clock with an LED indicator with bright, large numbers. On the Aliexpress website I found one that was suitable in terms of parameters and price (72 rubles). It consists of a finished printed circuit board and radio components that need to be soldered according to the diagram.

The clock supply voltage is 3-6 V, current consumption is 40 mA. Thus, they can be powered either from USB or from a rechargeable battery mobile phone, charger cell phone or from any suitable power source.

This article describes how to make and set up an LED clock with an alarm clock with your own hands.

Watch the entire manufacturing process in the video:

List of tools and materials
- set C51 ();
- screwdriver;
- scissors;
- soldering iron;
- cambric;
- rechargeable battery from a cell phone;
- connecting wires;
- box with a transparent lid;
- black cardboard from the packaging;
- cell phone charger.

Step one. Wiring out the clock circuit board.
The main element of the watch is the AT89C2051-24PC chip from ATMEL. It is installed on an adapter block soldered to the printed circuit board. The size of the printed circuit board itself is 52x42 mm, the size of the LED screen is 52x20 mm.

Wiring the elements is simple - the printed circuit board clearly shows the installation locations of the parts and their symbols. In the process of assembling the watch, the “” device that I described earlier was very useful.

My order of soldering the elements was as follows: first we solder resistors, capacitors and other components of the circuit except the controller and LED indicator. Finally, we solder the chip and the watch screen.

Step two. Assembly of LED clocks.
After soldering, you need to check the printed circuit board (if there is any accidental contact of solder on adjacent contact tracks). The board sizes are small, and this can happen.

If everything is fine, we supply power through the terminal block. My watch went straight away. The numbers on the screen lit up brightly, two dots in the middle blinked (seconds indication). All that remains is to come up with a case for the watch. I found a plastic packaging box with a transparent lid (from some souvenirs). I drilled a hole on the side and installed a connector for the “jack” of the charger. Inside the box there will be a battery from an old cell phone. I cut out a blank from black cardboard to the size of the transparent lid and installed it inside. In the cardboard we cut out a window the size of the LED indicator and two holes for the pushers of the clock setting buttons. We put extension tubes from the refill of a ballpoint pen on the buttons. We cut out a piece of polystyrene foam to fix the battery and printed circuit board, install it inside the box and close it with a lid. I sealed the sides of the lid with a piece of transparent tape. The entire structure is ready.

Step three. Setting the clock.
All that remains is to set the clock. This is done with the buttons S1, S2. A long press of the S1 button leads to the settings menu, it consists of nine submenus - A, B, C, D, E, F, G, H, I. The type of settings is selected with the S1 button, and the values themselves with the S2 button.

Types of clock settings.
A-hours\ B-minutes\ C-signal of each hour\ D-first alarm clock On\Of\ E-first alarm clock, hours\ F-first alarm clock, minutes\ G-second alarm clock, On\Of\ H-second alarm clock, hours\I-second alarm, minutes

If the power fails, the clock settings are not saved; this can be eliminated using a 3V battery and a pair of diodes.

Well, let's begin!
The board is made neatly. All element designations are readable.

There are no difficulties in assembly. Even a beginner who knows what a soldering iron is and how to hold it can handle it.
For those who don't know what kind of soldering iron they need. This one won't do.

The assembly process must begin with small elements.
Soldering resistors:

Then quartz and capacitors:

Oops! Well, I'm cross-eyed. Did you notice? We must remember to correct it.

Transistors:

Sockets for microcircuits, battery holder, buttons, power socket and “beep”:

We partially assemble the body:

And we try on the board. To know at what height to solder the temperature sensor so that it does not stick out. I tried it on. Soldered in. There is a light sensor nearby.

Now we solder the indicators.
Don't forget to turn the third indicator point up. And rinse the board from flux before installing them.

We insert a battery that will prevent the settings from being lost in the event of a power loss and will save the current time. Connect the power supply using the supplied cord. There is no power supply included. And thank God. There are already about ten of them lying around the house.
Hooray! Works!

We shove everything into the body and delight ourselves and those around us.

Case size: 10x4.5x3 cm.

Settings are made using two buttons. How to do this is written in the instructions, and I think it’s not very interesting to readers.
The clock shows the time, respectively, every 30 seconds. ambient temperature for 3 seconds. There is no calendar. Apparently missing from the firmware. But there are two alarm clocks.
The glow of the indicator segments depends on the lighting. It has two modes - bright and dim.

The family liked the watch.

Household member

Conclusion:
Can be taken by those who know how to solder.
That's basically it.
All the best and success.

P.S.
For lovers of precision.
Over the past week, the clock has fallen behind by 9 seconds.

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