ELM365 データシートの表示（PDF） - Elm Electronics

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ELM365

Security System Controller

Elm Electronics 

ELM365

Example Application

Figure 1 shows the ELM365 as the controller in a

typical home security system.

Series connected magnetic switches monitor door

positions, and connect to the delayed loop input. Several

window switches are connected in series to the instant

loop input, and panic switches are provided in the

bedrooms to cause an alarm when pressed.

Four LEDs are included in the circuit to show power

on (circuit armed), alarm, and loop status. In addition to

status, these LEDs also provide loop current for switch

wetting, and assist with the input pullup function.

Although not essential, it is recommended that the LEDs

be installed.

+5V

Panic

Switches

2.2KΩ

The series resistors on pins 4, 6, and 7 have been

included in this design for protection from electrostatic

discharge, or induced currents. Although the circuit will

function correctly without them, they are recommended

for the added protection that they afford.

The circuit supports two outputs, and both have

been included with this design. The pulsed output

drives an alarm buzzer, while the constant output can

drive yard lights, etc. Both outputs use a conventional

transistor circuit to energize a 12V relay coil.

Power for the circuit is from an AC supplied 12V

DC source, with only temporary backup provided by a

9V battery. Both inputs are diode coupled, passed

through the key switch, and reduced by the 78L05

regulator to 5V for the logic.

+12V

Instant

Loop

+5V

2.2KΩ

+5V

Alarm

300Ω

300Ω

5

4

6

3

1.0KΩ

+5V

7

2

8

1

1N4001

2.2KΩ

2N3904

Constant

Output

+12V

Delayed

Loop

Normal

12V Supply

300Ω

Power

1.0KΩ

300Ω

Key Switch

(Arm/Disarm)

78L05

0.1µF

1N4001

2.2KΩ

+5V

0.1µF

2N3904

Pulsed

Output

Optional 9V

Backup Supply

Figure 1. Home Security System

ELM365DSB

Elm Electronics – Circuits for the Hobbyist

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