Application
applicationIntroduction of door magnetic sensor
Door magnetic sensor is a kind of safety alarm device, which is composed of wireless transmitter and permanent magnet. It is used to detect whether doors, windows, drawers, etc. are illegally opened or moved.
Door magnetic sensor principle
There is an electromagnetic switch inside the door magnetic sensor wireless part, which is usually a dry reed pipe or Hall element. When the door is closed and the permanent magnet is close to the electromagnetic switch, the wireless door magnetic sensor is in the working waiting state, when the permanent magnet leaves the electromagnetic switch for a certain distance, the wireless door magnetic sensor immediately transmits a high-frequency radio signal containing address code and its own identification code (that is, data code). After receiving the signal, the host machine processes the signal.
Function introduction
Door opening alarm、Anti disassembly alarm、Press the key to open the door、Low pressure alarm
Programme indicators
The effective distance of 433.92mhz is 100 meters, and 315MHz is 80 meters
12V or 3V battery power supply, and the standby current of the whole machine is not greater than 10uA
Some customers need to be certified
Application chip
HS2303-PT、HS2245PT、HS2246PT
HS2303-PT Application description
The chip has many pins, which can meet all the existing needs of customers, door magnetic switch, anti disassembly key, ordinary key, low voltage detection, and this scheme can pass CE and FCC certification.
HS2245PT Application description
This scheme has simple circuit and few external components ， with a built-in 2.4V low-voltage detection (accuracy ± 0.1V). It can support one way of anti disassembly keys and one way of ordinary keys, and the functions can be customized. CE and FCC certification are not supported.
This scheme is the same as HS2245pt, with two more general I/O
