CN108734920A - It is a kind of based on 2.4G communication it is wireless close to warning system - Google Patents

Abstract

The invention discloses a wireless proximity alarm system based on 2.4G communication, which includes a receiving end and a sending end, the receiving end is fixed on the welding equipment, and the sending end is carried by the employee; the sending end circuit is composed of a button battery and a general-purpose MCU , RC circuit and 2.4G wireless communication chip; the receiver circuit part is composed of adapter interface, indicator light, buzzer, general-purpose MCU and 2.4G wireless communication chip. Compared with the prior art, the present invention has the following advantages: firstly, the arrangement is flexible, only the receiving end needs to be supplied with power, and no other wiring is required. The second is that it does not occupy the site and will not restrict the scope of activities of the operator. The third is that the warning lights and buzzers can actively prompt people approaching, which is more intuitive and obvious.

Description

A wireless proximity warning system based on 2.4G communication

technical field

The present invention relates to an alarm system, in particular to a wireless proximity alarm system based on 2.4G communication.

Background technique

Intense arc light and different degrees of sputtering will be generated during the existing pipeline bottom welding process. In order to prevent damage to nearby personnel, a telescopic isolation belt is set around the welding machine. According to the actual environment, the isolation zone can be formed into a closed circle, which can effectively prevent non-operating personnel from approaching. The shortcoming of this measure is: 1. Occupy the place, limit the range of activities of the operator. The isolation belt includes the base and the telescopic belt part, which will occupy a large area, and the operator can only enter and exit from the entrance and exit of the isolation belt. The flexibility of walking is very poor, and it will also cause great restrictions on the loading and unloading process. . 2. The layout process is troublesome and the flexibility is poor. When arranging, it is necessary to measure the position to be arranged on the spot according to the welding safety distance, and it can only be arranged in a polygonal shape, which has poor flexibility.

Contents of the invention

The present invention aims to solve the above disadvantages, and provides a wireless proximity warning system based on 2.4G communication.

The above object of the present invention is achieved by the following technical solutions: a wireless approach alarm system based on 2.4G communication, including a receiving end and a sending end, the receiving end is fixed on the welding equipment, and the sending end is carried by the employee;

Proximity detection of the present invention is based on 2.4G wireless communication, as shown in Figure 2, described sending end circuit is made up of button battery, general-purpose MCU, resistance-capacitance circuit and 2.4G wireless communication chip;

The MCU and the 2.4G wireless communication chip are connected through the SPI interface, the power supply of the sending end is provided by a CR2032 button battery, and the power supply is supplied to the 2.4G wireless communication chip after passing through the resistance-capacitance circuit;

The main functions of the MCU include the drive of the 2.4G chip, the analysis of sending and receiving information, and the timing wake-up. The 2.4G chip is mainly responsible for the wireless sending and receiving of information. In order to ensure as long as possible battery life, the system adopts an ultra-low power consumption design, and the MCU adopts a timer wake-up mode, which wakes up every 1S and wakes up the 2.4G chip. After sending the specified information, both the MCU and the 2.4G chip enter the power-down mode immediately , The system operating current is as low as 3.6 microamps in power-down mode.

Due to the limited output capacity of the button battery, when the peak current exceeds 15 mA, the voltage of the button battery will drop rapidly, causing the power to be exhausted quickly. In order to reduce the peak current when sending information, an RC resistance-capacitance circuit is added in front of the power supply pin of the 2.4G chip. Through actual test verification, the peak current can be reduced by about half, and the voltage will not drop rapidly.

As shown in Figure 3, the receiving end circuit part is composed of an adapter interface, an indicator light, a buzzer, a general-purpose MCU and a 2.4G wireless communication chip. The receiving end uses a 3.3V DC adapter to supply power through the adapter interface, and the MCU and 2.4G The wireless communication chip is connected through the SPI interface, and the indicator light and buzzer are driven by the GPIO port of the MCU.

The main functions of the MCU include the driving of the 2.4 chip, the analysis of sending and receiving information, and the driving of warning lights and buzzers. When the receiving end is working, it is in the receiving monitoring mode. Once it receives a signal from the sending end, it will immediately light up the warning light and turn on the buzzer. After receiving no signal from the sending end, it will turn off the warning light and buzzer after a certain delay.

Compared with the prior art, the present invention has the following advantages: firstly, the arrangement is flexible, only the receiving end needs to be supplied with power, and no other wiring is required. The second is that it does not occupy the site and will not restrict the scope of activities of the operator. The third is that the warning lights and buzzers can actively prompt people approaching, which is more intuitive and obvious.

Description of drawings

Fig. 1 is the on-site arrangement working diagram of using the alarm of the present invention.

Fig. 2 is a circuit composition diagram of the sending end in the present invention.

Fig. 3 is a circuit composition diagram of the receiving end in the present invention.

Detailed ways

Below in conjunction with embodiment the present invention is further described in detail.

As shown in Figure 1, a wireless proximity alarm system based on 2.4G communication includes a receiving end and a sending end. The receiving end is fixed on the welding equipment, and the sending end is carried by the employee;

When the sending end is within the set distance range of the receiving end, the warning light of the receiving end will light up and an alarm will sound. One receiving end can correspond to multiple sending ends. When any sending end approaches, an alarm will be triggered. When all sending ends are far away and exceed the set range, the receiving end will stop the alarm after a certain delay. As shown in Figure 1, the big circle is the set distance range. At this time, the transmitters 3 and 4 are within the circle, and the warning light and alarm sound at the receiver will be triggered.

Proximity detection of the present invention is based on 2.4G wireless communication, as shown in Figure 2, described sending end circuit is made up of button battery, general-purpose MCU, resistance-capacitance circuit and 2.4G wireless communication chip;

The MCU and the 2.4G wireless communication chip are connected through the SPI interface, the power supply of the sending end is provided by a CR2032 button battery, and the power supply is supplied to the 2.4G wireless communication chip after passing through the resistance-capacitance circuit;

The main functions of the MCU include the drive of the 2.4G chip, the analysis of sending and receiving information, and the timing wake-up. The 2.4G chip is mainly responsible for the wireless sending and receiving of information. In order to ensure as long as possible battery life, the system adopts an ultra-low power consumption design. The MCU adopts a timer wake-up mode, which wakes up every 1S and wakes up the 2.4G chip. After sending the specified information, both the MCU and the 2.4G chip enter the power-down mode immediately. , The system operating current is as low as 3.6 microamps in power-down mode.

Due to the limited output capacity of the button battery, when the peak current exceeds 15 mA, the voltage of the button battery will drop rapidly, causing the power to be exhausted quickly. In order to reduce the peak current when sending information, an RC resistance-capacitance circuit is added in front of the power supply pin of the 2.4G chip. Through actual test verification, the peak current can be reduced by about half, and the voltage will not drop rapidly.

As shown in Figure 3, the receiving end circuit part is composed of an adapter interface, an indicator light, a buzzer, a general-purpose MCU and a 2.4G wireless communication chip. The receiving end uses a 3.3V DC adapter to supply power through the adapter interface, and the MCU and 2.4G The wireless communication chip is connected through the SPI interface, and the indicator light and buzzer are driven by the GPIO port of the MCU.

The main functions of the MCU include the driving of the 2.4 chip, the analysis of sending and receiving information, and the driving of warning lights and buzzers. When the receiving end is working, it is in the receiving monitoring mode. Once it receives a signal from the sending end, it will immediately light up the warning light and turn on the buzzer. After receiving no signal from the sending end, it will turn off the warning light and buzzer after a certain delay.

The working principle of the present invention is: when the sending end is within the set distance range of the receiving end, the warning light of the receiving end will light up and an alarm will sound. One receiving end can correspond to multiple sending ends. When any sending end approaches, an alarm will be triggered. When all sending ends are far away and exceed the set range, the receiving end will stop the alarm after a certain delay. As shown in Figure 1, the big circle is the set distance range. At this time, the transmitters 3 and 4 are within the circle, and the warning light and alarm sound at the receiver will be triggered.

The above is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the content of the embodiments, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (1)

1. a kind of based on the wireless close to warning system, including receiving terminal and transmitting terminal of 2.4G communications, it is characterised in that：It is described to connect Receiving end is fixed on welding equipment, and transmitting terminal is carried by employee；

The transmission terminal circuit is made of button cell, universal MCU, resistance-capacitance circuit and 2.4G wireless communication chips；

MCU with the 2.4G wireless communication chips are connected by SPI interface, and the power supply of transmitting terminal is by a CR2032 button cell It provides, power supply gives 2.4G wireless communication chips to power again after resistance-capacitance circuit；

The receiving terminal circuit part is by adaptor interface, indicator light, buzzer, universal MCU and 2.4G wireless communication chips Composition, receiving terminal are powered using 3.3V DC adapters via adaptor interface, MCU and 2.4G wireless communication chips pass through SPI Interface connects, and indicator light and buzzer are driven by the GPIO mouths of MCU.