LED SEGMENT DISPLAYS is encapsulated by a plurality of light-emitting diodes together, and the lead has been completed in the internal connection, and it is only necessary to lead each stroke, common electrode. The digital tube is actually composed of seven luminous tubes, and the decimal point is 8. These segments are represented by letters A, B, C, D, E, F, G, and DP.
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1, LED digital tube display digital thermometer, accurate temperature measurement, buzzer upper and lower limit alarm
System Overview:
The digital thermometer designed in this system is the DS18B20 digital temperature sensor temperature measurement. DS18B20 is directly output to digital signals. Compared with the conventional thermometer, it has a convenient reading, has a wide temperature measurement, accurate temperature measurement, and upper limit alarm function. Its output temperature is displayed by LED digital tube, mainly used to relatively accurate temperatures.
The design controller uses 51 single-chip AT89S52, AT89S52 single-chip applied in industrial control, measurement, instrumentation, is also relatively wide. The temperature measurement sensor uses DS18B20, and DS18B20 is a high-precision digital temperature sensor for a web, due to its unique advantage of a single-bus, can easily set the sensor network, and make multi-point temperature measurement circuitry Be simple, reliable. The display is to achieve a temperature display with a 4-bit co-cathode LED digital tube. The advantage of the LED digital tube is that the display number is relatively large, and it is convenient. The buzzer is used to achieve alarm function when measuring the temperature exceeds the set upper and lower limits.
Scenario: https://www.cirmall.com/circuit/7989
2, control panel (two 3-digit tube, two buttons, 5 ~ 7 LEDs, two 5V voltage power potentiometers, one can be an external potentiometer)
Control panel (two 3-digit digital tube, two buttons, 5 ~ 7 LEDs, two 5V voltage power potentiometers, one can be used, drive IC, using our home appliance manufacturers) (microwave washing machine "and other types The panel likes to use) the day microbiological tube drive chip TM1642) can be displayed on a variety of microcontrolles such as STM8 STM32 51 AVR PIC. I have just written the driving of STM32, and the other single-chip drive is driven back. , Finished product contact QQ858860583.
Scenario: https://www.cirmall.com/circuit/3295
3,5 inch yang digital tube drive stable drive N digital tube (industrial grade) 485 communication design plan
A total of 5-inch digital tube cascading drive (anti-reverse, anti-surge)
1. Each digital tube is powered by a separate BUCK step-down circuit, stable and reliable. Each digital tube is 200mA, and the input voltage is used for 19V to 30V.
2, 74HCT595 + ULN2803 Drive Digital Tube, can be unlimited
3, STM32F030F4P6 master chip, 48M frequency can be online debugging
4, reserved 5 input and output IO, 1 serial port meets the vast majority of functional requirements
5, hardware design AT24C02 EPPROM meets small data repeated reading requirements
6, the components are on the board, which is convenient for SMT processing.
Scenario: https://www.cirmall.com/circuit/15891
4, four digits countdown
Countdown module instructions:
[From left to right, it is: a function key [start / pause / plus 1]; b set key; C selection key [digital management bit setting]; D method key (positive / countdown); E-return key]
Press the setting button, the digital tube bit is flashing the cursor, the function key setting time can be added 1, the selection button can switch the digital pipe bit, the setting key exit setting time, the function key is started down, the relay will start at the same time, then press it. The function key is paused, with the mode key to select the positive or countdown, press the function key to continue until the time arrives, the relay stops working, the sound and light alarm prompt!
Turn on the power switch, press the function key directly, the relay will start at the same time, reach 100 minutes (or 100 hours), the digital tube returns to the display 00:00, the relay stops working, the sound and light alarm prompt!
The LED lamp is the relay working status indicator. The LED represents the relay startup, extinguished the representative relay shutdown, LED1 is the indicator of the buzzer alarm!
As long as the digital tube is not in the set time state, it can be cleared with the E-return key. The digital tube will be displayed 00:00 (this time is not a reset to the main chip, just clear the status)!
You can also use a sentence to explain: Press the function key, the module starts working, the timing is time, the module stops working.
Scenario: https://www.cirmall.com/circuit/11483
5, digital pipe weight scale (can be known for large weight)
Digital pipe weight scale, high precision, can be known for large weight.
Video Demo: http://v.youku.com/v_show/id_xmtqyntgwmju2ma==.html? From = Y1.7-2
Electronic call button definition description
Use four buttons input, the keyboard corresponding name is as follows:
[1] For the reset button, the reset of the microcontroller, press the single-chip to reboot
[2] for calibration plus button
[3] for calibration reduction buttons
[4] button for clear button
Scenario: https://www.cirmall.com/circuit/12029
6. Digital tube industrial serial screen based on TM1638
Due to the narrow temperature range of the liquid crystal screen, we make a driving chip-based TM1638 digital tube industrial serial screen.
The specific parameters and advantages of digital tube industrial serial display are as follows:
Model: TY-SM-II 14512
Power supply: 5V power supply
Type: Digital Tube Industrial Serial Pout
Drive chip: TM1638
Work range: -40 ~ 80 ° C
Three advantages:
1, adapt to environmental
2, do not need MCU for a long time to refresh the screen, reduce the workload of MCU
3, occupying less IO resources, only six new
Attachment content includes: schematic and PCB, open with AD software
Scenario: https://www.cirmall.com/circuit/1275
7,51 single-chip ADC0832 digital tube display voltmeter (0-5V)
Based on 51 single-chip ADC0832 digital tube display voltmeter (0-5V) work design, simulation file, and source code. Pro test! ! !
Scenario: https://www.cirmall.com/circuit/3143
8, single-chip 8-bit digital tube multi-function calculator (DIY015)
--------------------------- Function brief -------------------- -------------
This work mainly completes the four-positive and negative four calculations, and can perform and add and reduce operation, with overflow indication, which can be deleted on the previous and empty input.
--------------------------- Hardware composition --------------------- ----------------
1.51 single-chip microcomputer
2.Lled indicator and a set of peripherals
3. Two 4-digit digital tube
4.6x4 keyboard
5. Power connector
---------------------------Function Description--------------------- ----------------
1. Display operational data via 8-bit digital tube
2. There are 24 buttons in total, arrangements
C | 7 | 8 | 9 | * | / |
± | 4 | 5 | 6 | - | MRC |
% | 1 | 2 | 3 | + | M- |
← | 0 | | = | | M + |
3. Digital tube can display data of -9999999 ~ 9999999
4. You can carry out four computational / affixed operations / and adding
5. Don't press C after operation, you can directly carry out the next set of operations.
6. Use the LED light to display overflow indication, the range is smaller than the -9999999 greater than 9999999, the digital tube is displayed by the overflow
7. You can implement the function of deleting the last bit, press directly to ← buttons
8. You can implement data clearing and re-supply function, press C button
9. The positive and negative data can be flipped directly, and press the ± button or in the input before entering the data.
---------------------------Instructions--------------------- ----------------
1. Power-on test: Enter the USB power cord to charge the charging treasure, charge the head, the USB port can be applied, press the power switch to work
2.2 quartes of the quarter: Press the first number of data, then press the second number after the + - * /%, the second number is input, and the result can be obtained, can be pressed during the process. ← Button Delete the top number, can press ± input positive and negative symbols
3. Return to: If you find that the input error is not pressed, you can press C to start a new calculation from the new input.
4. Addition and decrease: When the data is calculated, press M + / M-input second number to make
Scenario: https://www.cirmall.com/circuit/9088
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Source: Circuit City
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