Infrared photoresistor: mainly lead sulfide, lead telluride, lead selenide. Indium antimonide and other photoresistors are widely used in missile guidance, astronomical detection, non-contact measurement, human disease detection, infrared spectrum, infrared communication and other national defense, scientific research and industrial and agricultural production. Visible light photoresistor: including selenium, cadmium sulfide, cadmium selenide, cadmium telluride, gallium arsenide, silicon, germanium, zinc sulfide photoresistor, etc.
Visible light photoresistor is mainly used in various photoelectric control systems, such as photoelectric automatic opening and closing, beacon light, street lamp, photoelectric counter, smoke alarm, photoelectricTracking system and other aspects. Phototransistor sensors are widely used in various detection technologies. In addition to detecting light intensity and illuminance, it is also used to detect other non-electric quantities that can be converted into changes in light quantity, such as part diameter, surface roughness, strain, displacement, vibration, speed, acceleration, etc.
Add a Schmidt trigger after it, Schmidt trigger can use NE555, or use an op-amp connection. I can tell you that the RC filter must not work, no matter before, after, in the middle of the filter I have tried, can not count properly, because the final input counter clock edge is not good.
It is necessary to adjust the amplification of the triple tube, and the counter is the incoming signal is the current signal or the voltage signal? If it is a current signal, the photoresistor signal is converted into a current signal, with a three-tube, emitter output. If it is a voltage signal TTL level or CMOS level, you'd better use an analog comparator, use an integrated op amp, it's very simple. The rest, if you don't understand, you should go back to school.
1, register: register is a memory device, can temporarily store data or instructions. Registers are usually used to store temporary variables, addresses, flags and other information that the CPU needs to use when processing data. Its working principle is achieved by electronic flip-flops, when the data is input, the register stores the data inside, and the stored data can be read when needed. In a computer system, the number and bit width of registers often affect the running speed of the system.
2, summary: registers, counters, decoders and multiplex data selectors are all numbersThe basic components of word logic circuits, they have a wide range of applications in computer, communications and consumer electronics. These components are usually implemented through integrated circuit chips, and the 74 series is a common digital logic integrated circuit. In the actual project, the appropriate chip model can be selected according to the needs, and various complex functions and performance can be realized.
3, multichannel data selector is a digital circuit, it can select a specified signal output from multiple input signals. It has a number of data input ports and an output port, through a multi-bit selector to select the signal, output the selected signal. Multichannel data>
1, LS161 is a hexadecimal counter, for the base 60 (0-59) because it is not a prime number, it can have four methods. Serial connection, parallel connection, global set and global set to zero. Now introduce one of the most practical and simple methods, the whole number method. 59=16*3 11, so two 74LS161 chips are required. A synchronous sexagesimal counter designed with two 74LS160 chips can be used in the same wayStep cascade, asynchronous zeroclear implementation.
2, LS161 is a hexadecimal counter, for the base 60 (0-59) because it is not a prime number, it can have four methods. Serial connection, parallel connection, global set and global set to zero. Now introduce one of the most practical and simple methods, the whole number method. 59=16*3 11, so two 74LS161 chips are required.
3, can use a 74LS161 chip and the appropriate logic gate circuit to form a 60 base counter. 74LS161 is a 4-bit synchronous binary counter that can be convenientlyAchieve a count from 0 to 15. In order to achieve the base 60 count, we need to cascade the two 74LS161 and add the appropriate logic circuit. First, set the first piece 74LS161 (called counter A) to a mode 10 counter.
4, for the base 60 (0-59) because it is not prime, there can be four methods. Serial connection, parallel connection, global set and global set to zero. Now introduce one of the most practical and simple methods, the whole number method. 59=16*3 11, so two 74LS161 chips are required. Design one with two 74LS160 chipsStep six decimal counters can be implemented by synchronous cascading and asynchronous zeroclearing. The ones digit count is in decimal form.
1, dual input terminal four and non-gate integrated circuit chip. 74LS00N is a dual-input four-and-non-gate integrated circuit chip, which is often used in the design of digital logic circuits. It contains two independent 2-input and non-gates, which can realize logical functions, such as signal transformation, logical operation, timing control, etc. Using low power Schottky logic technology, with the originalThe 74LS series operates at the same speed but with lower power consumption. 2, in practical applications, 74153 chip can be used in digital logic circuit data routing, function generation and other functions, its dual multiplexer characteristics make it in the processing of two independent selection signals have a high degree of flexibility and efficiency.
3, LS73AP is an integrated circuit chip, belongs to the 74 series logic chip, usually used in the digital logic circuit flip-flop and latch. It can be used in sequential circuits, counters, state machines and other applications.
4. LS161 counterThe chip is widely used in various digital logic circuits, such as timing generator, pulse counter, frequency divider and so on. By combining with other logic gates or microprocessors, more complex control logic and timing requirements can be realized. In general, 74LS161 as a feature rich counter chip, with its flexible configuration and stable performance, plays an important role in digital circuit design.