Burglar alarm expansion unit with RS485 and RFM69/95.Designed by OpenHomeSecurity in Czechia
It is burglar alarm expansion unit with 8 balanced and 1 unbalanced (tamper) ports. Each port is able to connect to any commercial PIR, microwave sensor or reed switch. It's primarily made as expansi…Read More…
It is burglar alarm expansion unit with 8 balanced and 1 unbalanced (tamper) ports. Each port is able to connect to any commercial PIR, microwave sensor or reed switch. It's primarily made as expansion unit to OHS gateway, for which the example sketches are on GitHub. But it can work as standalone alarm unit, or it can be made to report the sensors states to any other base station via wired RS485 or radio RFM69/95. It's basically an Arduino compatible board with ATmega 328P running at 16MHz@3.3V.
Communication options are:
Programmable via standard FTDI programmer. RS485 version is programmable only via ISP(6-pin, using USBasp, another Arduino, or other programmer) as hardware serial is connected to RS485 chip, use upload via programmer in Arduino IDE.
Example sketches on GitHub are prefixed with OHS_2-extesion, then board revision 1_0, and board option like RS485_Siren. For example: OHS_2-extesion_1_0_RFM69_Siren
Balanced sensors can be attached using following scheme. As can be seen from below PIR sensor example, at least 3 wires are needed for operation. The board provides 12V and GND for the sensor operation, and after the resistor cascade, input is brought back to the expansion board. Standard wired 2k2 1/4w resistors for the balanced cascades are included. Unbalanced sensors, like reed switches or any passive sensor, can be connected directly without resistor cascade using just 2 wires. That is connected to GND, and any of the board input terminal. However balanced connection are more secure, and provide tamper detection to the wiring and sensor itself.
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