LED display is widely used due to its advantages of convenient use and low price. Its display interface can be divided into static display and dynamic display according to the driving method. Although the static display has high brightness and no flicker, it has the disadvantages of large power consumption, high I/O port and high cost. In the case of tight I/O ports, dynamic display is often used. Currently, there are many dedicated dynamic display interface chips available on the market. However, these chips are generally more expensive and are not suitable for use in inexpensive systems. Some dedicated chips (such as the MC14489) use hardware decoding, which displays a limited amount of information, which is difficult to meet various requirements and affects its application. Here, a low-cost, good-effect LED dynamic display circuit is introduced. Through software decoding and serial display mode, a large number of I/O lines are saved, which can display not only numbers but also most English letters.
1 Hardware description and working principle
The main hardware includes: single chip PIC12C508, two shift registers 74HC595, eight LED digital tubes, eight current limiting resistors of about 220 Ω.
1.1 Introduction to PIC12C508
PIC12C508 is a CMOS microcontroller developed by MICROCHIP with low price, low power consumption, high performance, 8-bit, full static and so on. It uses a RISC structure and has a wide range of applications, especially for portable electronic products.
The PIC12C508 pin diagram (see Figure 1) is described as follows:
GP0: bidirectional input/output port/serial programming data terminal;
GP1: bidirectional input/output port/serial programming clock terminal;
GP2: bidirectional I/O port;
GP3: input port;
GP4: bidirectional I/O port;
GP5: Bidirectional I/O port.
1.2 Introduction of 74HC595
The 74HC595 has an 8-bit shift register, a memory and a three-state output. The shift register is a serial input, 8-bit parallel (or serial) output. The shift register and memory are the input of the clock and data on the rising edge of SR-CLK and are shifted: Q0→Q1→Q2→...→Q7, and enter the storage register on the rising edge of RCLK. When E is low, the data of the storage register is output to the bus. The 74HC595 pin diagram (see Figure 2) functions as follows:
Q0~Q7: parallel data output terminal;
Q7': cascading output;
SRCLK: the clock input of the shift register;
RCLK: the clock pulse input terminal of the storage register;
SER: serial data input;
E: The output is active (low level);
SRCLR: Master reset (low level).
Fingerprint Lock Motor introduction:
Basic security work, lock body responsible for the security door lock body responsible for opening and closing lock, the lock body Lock Motor is of crucial importance.
Functions: it is widely used in various intelligent locks, such as Shared bicycle lock, fingerprint lock, glass lock, safe lock, hotel lock, family lock, inductive smart lock, etc
Features:Fingerprint Lock Motoris based on micro precision reducer development, small intelligent micro precision reducer can do 10 mm in diameter, is widely used in safe, locks, smart locks, sensor intelligent lock;
This kind of motor has the characteristics of low noise, low energy consumption, small volume, light quality, high precision, large torque and durability
Method of use: the best stable in horizontal plane, installed on the Fingerprint Lock Motoroutput shaft parts, cannot use a hammer to knock, knock prone to press into the dc Fingerprint Lock Motor drive, may cause damage to internal components, and cannot be used in the case of blocked.
Operating temperature range:
lock motor should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at ordinary room temperature catalog specifications re based on use at ordinary room temperature (approximately20~25℃.
If a lock motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.
Storage temperature range:
Fingerprint Lock Motor should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.
Service life:
The longevity of Fingerprint Lock Motor is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.
â—Use with a load that exceeds the rated torque
â—Frequent starting
â—Momentary reversals of turning direction
â—Impact loads
â—Long-term continuous operation
â—Forced turning using the output shaft
â—Use in which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a voltage that is nonstandard as regards the rated voltage
â—Use outside the prescribed temperature or relative-humidity range,or in a special environment.
â—Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.
when it come to volume production,we're a major player as well .each month,we rurn out 600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you
Looking forward to your inquiry. Welcome to our factory.
Fingerprint Lock Motor,Motor For Fingerprint Lock,Gear Motor For Fingerprint Lock,Dc Motor For Fingerprint Lock
Shenzhen Shunchang Motor Co., LTD. , https://www.scgearmotor.com