Short-range wireless transmission has the advantages of strong anti-interference performance, high reliability, good security, limited geographical conditions, flexible installation, etc., and has broad application prospects in many fields. Low power consumption and miniaturization are actual needs of users for current wireless communication products, especially portable products, and short-range wireless communication has gradually attracted widespread attention. Common short-range wireless communication includes 802.11-based wireless LAN WLAN, Bluetooth (BlueTooth), HomeRF and European HiperLAN (high-performance wireless LAN), but its hardware design, interface, communication protocol and software stack are complex, requiring special development. The system has high development cost, long cycle and high final product cost. Therefore, these technologies are not widely used in embedded systems. Ordinary RF products do not have these problems, and short-range wireless data transmission technology is mature, simple in function and convenient to carry, making it widely used in embedded short-range wireless products.
The clock circuit and reset circuit of the single-chip microcomputer : In the design of the single-chip clock circuit, the crystal frequency is selected to be 11.059 2 MHz, the communication speed between the PC and the single-chip microcomputer is 9600 b/s, and the corresponding capacitor is connected with the clock pin of the single-chip microcomputer to form a clock loop. . In the reset circuit design, the reset circuit is formed by using a reset pin and a corresponding capacitor and resistor. The principle circuit of the MCU and PTR2000 interface is shown in the figure.
MCU and PTR2000 interface circuit: AT89C52 MCU mainly completes data acquisition and processing, sends data to PTR2000 module, and receives data transmitted by PC through PTR2000. The PTR2000 module connected to the MCU mainly modulates the data to be transmitted of the MCU into a RF signal, and then sends it to the PTR2000 module of the PC, and simultaneously receives the RF signal transmitted by the PTR2000 module of the PC, and modulates the TTL signal that can be recognized by the MCU to the TTL signal. Single chip microcomputer. The RXD and TXD pins of the MCU are connected to the DO and DI pins of the PTR2000 respectively to realize serial data transmission. The TXEN, CS, and PWR pins of the PTR2000 module work mode and the P2 of the MCU I/O control port are determined respectively. 0~P2.2 are connected. When PTR2000 is working, its working mode is controlled in real time by the running control program in the single chip microcomputer.
The interface circuit design first requires level shifting. The serial port of the PC supports the RS-232 standard, while the PTR2000 module supports the TTL level. The MAX232 device is selected for level conversion between the two. The interface circuit is shown in Figure 3. The PTR2000 module performs serial input and output, and the pins DI and DO are connected to the serial port of the PC through the level shifting device; the low power control pin of the PTR2000. PWR is connected to the high level VCC, that is, the PTR2000 is fixed in the normal working state; the channel selection pin CS is connected to the GND low level, that is, the fixed communication channel 1 is used, and the fixed operation is at 433.92 MHz; the RTS signal of the PC serial port controls the TXEN pin. To determine when the PTR2000 module is in receive and transmit state. The transmission rate of the PC and serial port is set to 9 600 b/s, which is consistent with the microcontroller.
ZGAR electronic cigarette uses high-tech R&D, food grade disposable pod device and high-quality raw material. All package designs are Original IP. Our designer team is from Hong Kong. We have very high requirements for product quality, flavors taste and packaging design. The E-liquid is imported, materials are food grade, and assembly plant is medical-grade dust-free workshops.
From production to packaging, the whole system of tracking, efficient and orderly process, achieving daily efficient output. We pay attention to the details of each process control. The first class dust-free production workshop has passed the GMP food and drug production standard certification, ensuring quality and safety. We choose the products with a traceability system, which can not only effectively track and trace all kinds of data, but also ensure good product quality.
We offer best price, high quality Vape Device, E-Cigarette Vape Pen, Disposable Device Vape,Vape Pen Atomizer, Electronic cigarette to all over the world.
Much Better Vaping Experience!
E-Cigarette Vape Pen,Disposable Device Vape,Vape Pen Atomizer,Latest Disposable E-Cigarette OEM vape pen,OEM electronic cigarette
Shenzhen WeiKa Technology Co.,Ltd. , https://www.oemvape-pen.com