Exhibition admission count counter, counterter
Keywords: Exhibition Admission Count Counter
The number of admission to the field is a counting circuit that is transmitted and received by infrared. The maximum distance of its transmitting and reception can reach 8 meters, and can perform accurate counting in indoor natural light, no need to focus on light. The counter can be used in the statistics of the number of urban exhibition people.
1. Infrared transmit circuit
The transmit circuit is shown in Figure 1, powered by a + 9V battery. 555 Time of the base circuit and the peripheral components R1, R2, RP, C1-C3 constitute a multi-resmicker whose oscillation frequency is 38 kHz (adjusted by RP).
555 38kHz square wave output from the foot. By the current limit resistor R3, the two infrared transmitting tubes IR1 and IR2 are directly driven, and the infrared beam IR is transmitted to the infrared receiving end.
2. Infrared reception and counter circuit
The circuit of Figure 2 consists of an infrared receiving module (TSOPL738), electronic switch V, photocoupler IC3, and ordinary 8-bit calculator, wherein the two plates of the calculator or the like and the photocoupler IC3 4, 5 foot Connected. Circuit power is powered by AC (primary), transformer T buck, D1-D4, C4 rectifier filtering, and regulator IC2 output + 5V voltage supply circuit operation.
After the power switch S2 of the circuit, the power switch S2 is turned on, and the calculator is set, the method is as follows: Open the calculator (power-on), press the "+" button after the number "1" key, at this time, the calculator display The number of "1" appears is in standby.
When the infrared rays are transmitted and received, when the circuit standby (static), the circuitry has always transmitted infrared rays, and the receiving module TSOP 1738 of FIG. 2 is in the receiving state of the infrared ray, so the 3 foot of TSOP 1738 outputs "0" level, at this time V is in The cutoff is turned off, the photocoupleer 4, 5 is in the open state, and the calculator does not work. If the infrared rays transmitted by Figure 1 are interrupted once, then the 3 foot output of the module is received high, the photocoupler IC3 is excited, the output pipe is conducted, 4, 5 foot short, the result calculator is displayed 1 That is, the display is counted once.
If the infrared rays transmitted by Figure 1 are closed again, the above process is repeated, the calculator is displayed as 2 ..., forming a conditional accumulated count function.
3. Installation and use
Figure 1, Figure 2 circuits are mounted by two printing plates, and after the circuit is installed, the 3-foot square wave signal with the measured frequency should be used to calibrate (38 kHz). It is guaranteed that the infrared line is reliable and effective reception distance. Figure 2 The circuit can work normally as long as the installation is correct.
The circuit boards of Figures 1 and 2 are respectively mounted on both sides of the door on the door, respectively, and the infrared emission diode directs the infrared receiving module. Turn on the power, preset the calculator according to the above method, at which point at the entrance to the exhibition, the number of people entering the exhibition can be subjected to automatic statistics.
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