Good luck clock Arduino
Good Luck Clock
Many consider the number «13» on the clock a bad sign. This project implements a table clock that will never upset its owner. During the day, instead of «13» hours, they will show «01». Instead of 13 minutes, it will be «14». In general, the watch will become absolutely harmless for those who believe in mystical powers. A watch is not just a device for measuring time. It is a symbol of freedom, independence and individuality. And it is these qualities inherent in the watch that will be displayed in this project.
Interesting features:
- large display;
- changing the brightness depending on the illumination;
- automatic demonstration of the date when the user approaches the clock;
- «sleep» mode;
- auto-correction of the clock to improve accuracy;
- minimum of controls.
Components
The project uses components:
- Arduino Nano — 1 pc;
- Light sensor KY018 — 1 pc;
- Presence sensor AM312 — 1 pc;
- Two 10kOhm resistors;
- DS1307 Real-time clock;
- LED matrix MAX7219 — 1 pc;
- Encoder — 1 pc;
- Power connector — 1 pc;
- Transparent sticker on the hole for the light sensor — 1 pc;
- Cables 5 pieces with a plug for connection to the board, of which:
- 2 pcs. x for 5 contacts;
- 2 x 3;
- 1 x 2
- Housing for the device 158 x 90 x 60 mm;
- Adapter for power supply of the device 5V, 2A;
- A board for assembling all components (alternatively, a universal board).
A printed circuit board specifically for this project
You can print the board on the EasyEDA website, the cost with delivery is about $ 30 (10 pcs). The Gerber file for ordering the board can be downloaded below.
All components:
Device diagram:
Device Assembly:
1. Holes must be made in the housing for the LED matrix, encoder, presence sensor, light sensor and plug to power the device from the adapter.
2. Solder the cables to the encoder, presence sensor, light sensor, power plug and LED matrix.
3. Solder an Arduino microcontroller, a real-time clock, two resistors and five contact groups to the board to connect the peripherals.
Generic circuit boards can also be used to connect all components.
In this case, there are too many connections made of wires, in which it is easy to get confused, as in the picture below. The reliability of connections during the installation of components is significantly reduced.
4.Attach the board to the case and attach all sensors to it. We attach the sensors to the housing.
The hole for the light sensor is covered with a transparent plastic sticker. The adapter connection input is glued on the back side.
5.The board is glued to the case on strips of foam.
Everything is ready. It remains to fill in the sketch and close the lid.
Device management program (sketch)
Click the archive link with a text file containing a program for controlling the device.
if ((time.Hours == 13) & (time.minutes == 13)) {
time.gettime("d-m-Y, H:i:s, D");
h = time.hours;
m = time.minutes + 1;
}
else if ((time.Hours == 13) & (time.minutes != 13)) {
time.gettime("d-m-Y, H:i:s, D");
h = time.hours;
m = time.minutes;
}
Let's consider in detail the individual blocks of the Arduino clock management program.
- Displays the current time on the display.
- A running string with the readings of the current date when approaching the clock.
- Setting the date and time. One of the necessary functions of the Arduino clock is the ability for the user to set the date and time. We organize the control of this function by means of an encoder.
- Automatic change of the brightness of the clock display depending on the illumination. The watch can automatically change the brightness of the display depending on the current lighting conditions, so that the user always sees a clear picture in bright ambient light, and in low light the display does not blind the eyes.
- Switching the clock to sleep mode.
- Determination of the day of the week.
- Automatic adjustment of the accuracy of the clock.
You can use a more presentable device case, an encoder handle, and decorate the case with stickers.
