At present, many remote control switch products on the market have single functions, are large in size, and have poor working reliability, making it difficult to meet a variety of usage requirements. The multifunctional wireless remote control switch circuit introduced in this article is simple, small in size, and stable in operation. It can realize forward and reverse rotation of the wireless remote control motor and multi-way switching functions. With a little modification, it can realize a variety of function combinations. It has strong practicality.
A wireless remote control switch is a wireless remote control and a device used to remotely control equipment. The birth of wireless remote control has a history of more than 100 years. It is impossible to know who invented the first wireless remote control. , but the earliest wireless remote control was developed by Nikola Tesla in the United States in 1898.
In our lives, there are two common wireless remote control connection methods. One is the infrared remote control mode, and the other is the radio remote control mode. The infrared remote control mode is the common TV remote control and air conditioner remote control in our homes. Today, we are mainly talking about another type, “radio remote control”.
Radio remote control mode:
Commonly used frequencies for radio remote controls are 315mHz or 433mHz. Wireless remote controls use the open frequency band stipulated by the state. In this frequency band, if the transmitting power is less than 10mW and the coverage range is less than 100m or does not exceed the scope of the unit, it does not need to go through ” Used freely with the approval of the Radio Regulatory Commission.
my country’s open frequency band is 315mHz, while European and American countries stipulate it is 433mHz, so products exported to the above countries should use 433mHz remote controls; there are three types of coding methods commonly used for radio remote control, namely fixed code, learning code and rolling code. Learning code and rolling code are upgraded products of fixed code. Rolling code remote control is currently the most secure. Currently, rolling coding method is used in situations with high confidentiality requirements.
The advantage of radio remote control is that the remote control distance is long, the low-power one can reach 100 meters, and the high-power one can reach 3000 meters, which greatly improves the convenience and safety of operation, and is not interfered by objects, saving costs and improving efficiency. The disadvantage is that because it is in an open frequency band, it is easily affected by surrounding electronic equipment.
Wireless remote control switch:
The wireless remote control switches we commonly use now are based on radio remote control mode and based on WIFI or 4G transmission. The 4G wireless remote control switch developed by Zongheng Intelligent Control can realize remote control of equipment switches in a real sense. It can remotely control switches such as fans and water pumps through mobile phone applets. It also supports local logic operations and can pre-set thresholds. When the threshold is exceeded, the switch is automatically implemented.
Widely used in home appliances, industrial control equipment, agricultural irrigation and other fields.
The smart switch designed in this article can control the closing and opening of the switch according to the time required. And it can work safely and stably to solve some common problems of traditional mechanical power switches. If manual operation is required, it is safe under high pressure. Poor sex. Unable to meet the requirements of specific occasions. Make it an intelligent and adjustable switch. It is convenient for use in daily production, life and experiments: the designed power switch also has a clock display function. In normal operation, it can display the year, month, day, week, hour, minute and second. In short, this smart switch has the characteristics of simple circuit, easy operation and comprehensive functions.Keywords: network IO controller