Smart Bluetooth Circuit Design Atlas - Circuit Diagram Reading Every Day (61)

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

TOP1 Smart Bluetooth Barrier Car System Circuit

Nowadays, with the rapid development of science and technology, the application of small intelligent systems at home and abroad is more and more extensive, and there are more and more types. This design is a design-related subject identified in conjunction with relevant research projects. The smart car designed should be capable of remote control. The intelligent car control system adopts a STC89C51 single-chip microcomputer as the main control chip of the control system. The hardware includes the following modules: drive motor module, single-chip control module, bluetooth module and power module. This design adopts STC89C51 single-chip microcomputer as the core control part of the smart car, and realizes the intelligent control of the car through the query mode. The trolley consists of a main control panel, a power supply system and a body. The main control system consists of the main control CPU circuit and DC motor drive circuit. The DC motor drive adopts PWM modulation technology, which can flexibly and conveniently control the vehicle speed and travel direction.

Circuit principle: This system uses the single-chip STC89C51 single-chip microcomputer as the main control module of the system. We use the android mobile phone to control the Bluetooth slave on the vehicle. The signal recognized by the sensor is analyzed and judged by the single-chip microcomputer, and the control of the DC motor is controlled. To achieve direction change. The schematic diagram of the car is shown in the figure below. The motor controls the direction and speed of rotation through the L293F chip. Among them, SPEED1 and SPEED2 control the speed of two motors through PWM regulation, IN1 and IN2 control the direction of rotation of the left motor, and IN3 and IN4 control the direction of rotation of the right motor. By controlling these six ports, the trolley can travel according to a predetermined trajectory.

The car body structure is good, completely independent design, the car adopts two-layer structure, and the components of different modules are separated, and the debugging process and the modification process are relatively simple. This design adopts STC89C51 single-chip microcomputer as the control core to realize the intelligent control of the car. The control system not only has strong practical value in the smart car, but also has strong practical value in automotive applications and intelligent robots, especially in the field of robot research. Therefore, this design is related to reality and has important practical significance.

Smartphone Bluetooth controlled car system circuit

The hardware design of the whole system can be divided into four modules: power supply circuit, single-chip microcomputer minimum system, motor drive module, and Bluetooth module. The power circuit supplies power to the entire system, including the microcontroller AT89C52, motor drive, Bluetooth module, and other peripheral circuits. The power circuit is divided into two parts: (1) connecting the external power supply to the motor; (2) using 4 dry batteries as the power supply to supply power to the system to ensure the normal operation of the MCU, the motor drive, and the Bluetooth module. When the power circuit supplies power to the system, the green indicator lights up, but the current power supply is normal. The minimum system part of the MCU is the intelligent control part of the whole system and the core part of the whole system. The motor drive module L298 needs to connect two voltages from the outside, one for the motor and the other for the L298 chip.

Single chip AT89C52 system circuit

AT89S52 microcontroller integrates 256-byte program running space, 8K bytes of Flash memory space, and supports up to 64K external storage expansion. The clock frequency can be set between 0 and 33M depending on the operating speed and power consumption requirements. On-chip resources have 4 I/O control ports, 3 timers, 8 interrupts, software set low power mode, watchdog and power down protection. It can operate normally over a wide voltage range of 4V to 5.5V. The ever-evolving semiconductor process also reduces the power consumption of the microcontroller. At the same time, the MCU supports computer parallel port downloading, and a simple digital chip can be used as a download line. According to the requirements of different occasions, this MCU provides a variety of packages. This design uses the dual-in-line DIP-40 package according to the specific situation that the minimum system sometimes needs to replace the MCU.

L298N type driver circuit

The L298 is more commonly the L298N in a 15-pin MulTIwatt package, which also contains a 4-channel logic driver circuit. It is convenient to drive two DC motors or one two-phase stepper motor. L298N chip can drive two two-phase motors, or drive a four-phase motor, the output voltage can be up to 50V, and the output voltage can be adjusted directly through the power supply; the signal can be directly provided by the IO port of the single-chip microcomputer; and the circuit is simple and used. Convenience. The L298N accepts the standard TTL logic level signal VSS, which can be connected to 4.5 to 7 V. The 4-pin VS is connected to the power supply voltage, and the VS voltage range VIH is +2.5 to 46 V. The output current is up to 2.5 A and can drive inductive loads. The emitters of the 1 and 15 foot tubes are separately led out to access the current sampling resistor to form a current sensing signal. L298 can drive 2 motors, OUT1, OUT2 and OUT3, OUT4 can be connected to the motor separately. We chose to drive one motor in this experimental device. The 5, 7, 10, and 12 pins are connected to the input control level to control the forward and reverse rotation of the motor. EnA, EnB is connected to the control enabler, and the control motor is stopped. L298N is a product of SGS Company. It contains 4 channels of logic drive circuit. It is a special drive for two-phase and four-phase motors, which contains two H-bridges. The high-voltage, high-current, dual-bridge driver accepts standard TTL logic-level signals and can drive motors below 4V and 2V.

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