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Presumably every amateur radio operator, or even just a layman, has seen the electronic LED heart project. They usually come in 2 types:
1) The simplest ones are made based on the type of multivibrator on the 555 series of transistors or timers. They are not expensive and the results are frankly mediocre 🙂 but they are suitable for beginners to build.
2) The software is more complicated to make on the microcontroller. Of course, in this version, the total project cost is higher, but so are the opportunities. You can program all kinds of beautiful effects, not just switching one set of LEDs to another and back like the first option.
However, the first and second options are usually developed as gifts for lovers or loved ones on Valentine’s Day, February 14th. Of course, in most cases, this kind of gift will be included in a short period of time directly during the holiday itself and after the holiday itself.some time. This is what I had in mind, if we made a heart watch in the form of a screen print and put another heart in it, but this time smaller on a white LED. Say – Done! The work produced is up to you to judge.
Such electronic items are not only very suitable as Valentine’s Day gifts, but are also very useful in daily life. The device displays the current time and temperature in sequence. Well, how can there be no animation of the heart? For example, it can light up smoothly and turn off gradually every second, but this is just one of the options. You can make it shine continuously. You can Select another option below.
The animation of the LED heart will always remind your significant other and give a pleasant emotion anywhere, whether at home or in the office.
PCBdesign Process I develop the printed circuit board as usual in the Altium Designer 15 program, and I’m perfectly content with that. It turned out that the PCB was 2 layers and there were no issues. Dimensions 90 x 85mm. It is not difficult to solder. The radio components are relatively large, such as SMD 0805, the LED is 5mm large, and the integrated circuits are all soldered. There is no BGA or the like here. I ordered the printed circuit board from PCBWay.
By the way, the socket for the battery is soldered from the PC motherboard, which only slightly distorts the end result. There was no way to spend more money on AliExpress, but letting the conclusion stick was a perfunctory idea that didn’t look good from the front, so I did it.
– Shows the future time. – Temperature display. – Temperature measurement range: -55…+125 grams. S. – Measurement accuracy: ±0.5 grams. S. In the range -10…+85 g. S. – Displayed degree of reunion: 0.1 g. S. – Displays alternative forms of information. Customizable. – Nighttime RW Escorts form. Customizable. – Reduces the brightness of the display in night mode at a set time, with the possibility to completely disable the display and heart. – 7 levels of display brightness in day mode. – Effects on the heart are divided into 2 groups. They are being configured. Group 1 – Consequences displayed per second. Group 2 – Consequences shown within a Rwandans Escort time distance of 1…60 minutes – Menu. Control of the 4th button. “Menu”, “Up”, “Down”, “Enter”. – Leave the Rwanda Sugar Daddy setting inin non-volatile EEPROM memory. – Possibility to reset to default settings. Short video:
Hardware and software description The clock is generated by an 8-bit STM8S103F3P6 microcontroller in a TSSOP-20 enclosure. A 7-segment 4-digit display with common cathode displays information. The display is controlled by a proprietary microchip from the company TitRwandans Escortan Microelectronics TM1628. It communicates with the microcontroller via a hardware SPI interface. Data is sent from the PC6 port, clock pulses are sent from PC5, and strobe pulses are sent from PC4. All the work of inputting data to the display is Rwandans Escort taken care of by the chip, which means you don’t need to use interrupts to provide static instructions . Only when needed, Rwanda Sugar Daddy we send data to the LED driver and perform other operations.
The DS3231 chip in the SOP-16 enclosure serves as a real-time clock (RTC). The chip has a “magic” input called SQW that produces a positive polarity pulse every second.
This MC has a PC3 (TLI) port-Top Level Interrupt (the highest priority for handling interruptions). SQW electronic signals are stopped on this port. In other words, when the RTC pulse comes, it says STM8 Hey, brother? Throw everything away, a second has passed :), let’s quickly jump into the interrupt handler and set the flag! In this aborted handler, a special flag is set to 1, which I call Flag1Sec. In the main loop of the program, this flag is checked and when it is 1, the data is read from the RTC. required, it will appear on the display and the flag will be reset to 0 instantly. After that, the microcontroller will continue to check in the interrupt handler whether the flag is set after 1 second, and the whole process will be repeated infinitely, that is, when the clock is turned on. Why complicate the job? IMHO, just everything you need.
The heart is done on 14 and white Rwanda Sugar color 5mm slightly matte LEDs 🙂 I made it in the last Obtained from a mission, they were borrowed from the unwanted back panel of an old computer. They show hard drive movement naturally there on a regular basis. I suggest you applyMatte, too bright can be dazzling – but that’s not true :)), the brightness is generally adjusted from 1…100%. So it’s a retreat. We continue.
They control 2-aRwanda Sugar Daddy Shift 8-bit serial register 74HC595 LED, everything These all rely on the same hardware SPI tasks. The hardware PWM on timer 2 assists the heart with a brightness control electronic signal, channel 3, whose input to port PA3 is pin 10 of the microcontroller. N-channel field effect transistor VT1 – LED key on FDN337N.
The MC is clocked by the built-in HSI generator at 16 MHz, and the program delay is implemented on the TIM4 timer without application interruption. The program was written in C language using ST Visual Develop v4 development environment 3.12 and Cosmic compiler. As much as possible I try to write directly into the register without using any libraries.
The data is displayed on the display in an alternating manner. For example, 10 seconds. Shows the time, then 3Rwandans Sugardaddy seconds. Temperature is fine, all over again. It’s only up to you to decide how long to display it. It is configured in a special simple menuRwanda Sugar Daddy where you can also enable/disable cardiac effects , and configure other options.
The temperature sensor is connected to the PD2 port. As a temperature sensor, the famous folk digital DS18B20 is used, which works on the 1WIRE bus. For the reliability of the reading, it must be placed inside the watch case. When testing, I soldered it to the board right away and oh my god :)) I noticed that the longer the clock was running, the greater the average temperature increase of 1-2 degrees Celsius. For the PCB, the Rwandans Sugardaddy wires from it are soldered to the contact pads on the back of the board. I Rwandans Sugardaddy did not make any connectionsIf you want, you can put any connector on the watch’s own case and solder it to the board, in principle no problem.
The 4 buttons are mainly used to adjust the options in the menu. You need to choose their height according to your body size to look good. You can buy buttons of different heights, such as on AliExpress, which is not a problem now.
Schottky diode VD1 acts as reverse polarity protection.
All structures are powered by a solid +5V supply with a load current of up to 500mA (depending on the brightness set by Rwanda Sugar Daddy) . The programmer connects to the contact pads on the back of the board to populate the firmware via the SWRW EscortsIM interface, all contacts are signed, which There will be no problem where the wires are welded.
The main point worth mentioning is the minimum brightness of the display at night. The reality is that the brightness at night is forced to be at the RW Escorts minimum limit and cannot be Rwandans Escort Not enough to cut it, but it seems like it demands more 🙂
So I propose to anyone who will repeat this project. Considering the option of using a tint film to lightly tint your display, I can’t say that you need to try different options. Again, everything is purely RW Escorts personal and you need to choose/test. However, this all has to do with when the display is dimly lit, and if you choose the option in the menu to turn off the display completely, you don’t need to worry about it.
Unfortunately the menu description here doesn’t quite fit, but that’s not a problem, you can get familiar with it by visiting my website or instagram.
The article is in Russian, so please use Google Translate.
Download the app: Attention! Be careful to connect the programming lines, if you make a mistake, the device may malfunction! You need to use the STVP-ST Visual Programmer program to download the firmware. After downloading the firmware, immediately enter the “OPTION BYTE” tab. You need to configure the AFR3 configuration as the replacement function and select Port C3 Alternate Function = TLI from the drop-down list. This is very important, nothing works without this option! Once selected, click on the white arrow icon for the top chip and upload it to the microcontroller. Disconnect the programmerConnection with the circuit board. Once you download the Romantic Clock Thermometer software, you can apply the default settings.
ledpcb printed circuit board
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