Circuit analysis and production of two-dimensional lantern controller

This lantern controller can control five channels of lanterns to light up row by row. Then it goes out line by line. If a certain number of colored lights are connected in combination. You can create a scene with color changes on a flat surface. This is a much richer and more colorful flow than usually controlling the flow of color on a line. This controller uses digital integrated blocks. There are few peripheral components and the circuit structure is simple. As long as the components are intact and the installation is correct. No need to debug after installation to achieve success in one fell swoop. This article uses the two-dimensional lantern control signal flow as a clue to analyze the basic working process of the relevant digital integrated circuits, and introduces the production process of the two-dimensional lantern controller according to the electronic assembly process requirements. I hope this article will inspire students from electronic technical schools and electronics enthusiasts to understand and become familiar with the application of digital circuits. The circuit working principle of the two-dimensional lantern controller circuit is shown in Figure 1, which mainly consists of the NOT gate lCl (CD4069), counting and timing distribution circuit IC2 (CD4017), analog electronic switch IC3 (CD4066) and D trigger IC4 (CD40174), etc. composition. The logical functions and pins of CD4069 are shown in Figure 2a, in which the NOT gates F1 and F2, external resistors R2, R3, and capacitor C4 form a multivibrator, which generates a pulse square wave of about 3Hz. Supply CD4017 as counting pulse and CD40174 as shift pulse. R3 and C4 are oscillation timing components. Adjusting these two components can change the frequency of the oscillation signal, thereby controlling the flow speed of the lantern colors. to present various visual effects. In addition, the NOT gate 3 of CD4069 is also used as an inverter for the reset signal of CD40174. CD4069 is a CMOS digital integrated circuit. It is a high input impedance device. It is easily affected by external interference, causing logic confusion or induced static electricity and breakdown of the gate of the field effect transistor. Although protection circuits are provided at the internal input terminals of the device, they are limited in absorbing transient energy. Excessively large transient signals and excessive electrostatic voltage will render the protection circuit ineffective. Therefore, the input terminals ⑨, ⑩, and ⑩ of the unused NOT gates F4, F5, and F6 in CD4069 are connected to the Vss ground terminal for protection. The pulse train sent from the output terminal ④ of the CD4069 multivibrator. All the way is directly sent to the counting pulse input terminal ⑩ pin of CD4017. CD401 7 is a decimal counting and timing distributor. Used to generate control signals for CD4066 analog switch switching. Its pin functions are shown in Figure 2b. Cr is the reset terminal. When the Cr terminal inputs a high level, the counter is set to zero. The CD4017 has an auto-start feature when the circuit enters an inactive state. Under the action of counting pulses. It takes at most two clock cycles to return to the normal cycle. Therefore, the CD4017 of this controller is not equipped with a power-on reset circuit. Co is the carry output terminal. When the count reaches 10 clock pulses, a positive pulse is output. CD4017 has two counting input terminals, CL and EN. The CL terminal is the pulse rising edge trigger terminal. If the counting pulse is input from the CL terminal, the EN terminal should be connected to low level; the EN terminal is the pulse falling edge trigger terminal. If the counting pulse is input from the EN terminal. Then the CL terminal should be connected to high level. Otherwise, counting pulse input is prohibited. The counting pulses taken from CD4069 are input from its CL terminal ⑩ pin. Therefore, pin ⑩ of the EN terminal is grounded. Y0~Y9 are the ten output terminals of the counter. The pulse square wave sent from the output end is connected into two control signals through the isolation diodes VD3~VDl2, and added to the analog switch CD4066. when the first counting pulse arrives. The internal circuit of CD4017 flips, and pin ③Y0 is at high level. Add it to pin CD4066⑩ via diode VD5. CD4066 is a bidirectional analog switch, and its pin functions are shown in Figure 2c. It contains four independent analog switches A, B, C, and D. This controller uses two switches, B and D. Each switch has an input terminal and an output terminal, which can be used interchangeably. The input pin ⑩ of switch B is connected to the power supply and connected to a high level; the output pin ⑧ of switch D is connected to ground; because the two switches are connected in series. The output terminal pin ⑩ of the B switch is connected to the input terminal ⑨ pin of the D switch, which serves as the switching point between high and low levels. in addition. Pins ⑥ and ⑥ of CD4066 are the strobe terminals of switches B and D respectively. When a high level is input, the switch is closed; when a low level is input, the switch is open. Switch B is under the action of high level input from pin ⑩ of its strobe terminal. Connect pin ⑩ and pin ⑩, and pin ⑩ becomes high level. at the same time. The remaining output terminals Y1~Y9 of CD4017 are all low level, so the strobe terminal of switch D of CD4066 is also low level. Switch D is turned off, which does not affect the level state of pin ⑩. The high-level signal output by C04066 pin ⑩ is directly sent to the serial input pin ③ of the D flip-flop CD40174. CD40174 contains 6 D-type flip-flops inside. As shown in Figure 2d. This controller connects 5 of them into a five-bit shift register with serial input and parallel output. Among them, D6 is the highest flip-flop. D2 is the lowest flip-flop (D1 is not used), arranged in order. Each flip-flop has its own input and output. The output terminal Q of the higher-digit flip-flop is connected to the input terminal D of the lower-digit flip-flop. Only the input terminal CD401 74③ of the highest flip-flop D6 receives the pulse signal. CD401 74 ②④ feet, ⑤⑥ feet, ⑦⑨ feet, ⑩⑩ feet, and ⑩⑩ feet are the connection points for the input and output ends of each adjacent flip-flop respectively, serving as the parallel output end of the five-bit register. The reset terminals of each flip-flop are connected together to serve as the total clear terminal of the register. Low level reset is valid before register operation. The work start reset signal should jump to high level. And keep it up while working. The reset signal is provided by capacitor C