# Alarm system

## Problemformulering

We want to make an alarm system.
The system must be able to control locks, react to motion sensors, sound an alarm, flash a LED and be unlocked with a key card and a simple web interface for locking and unlocking.

## Løsningmodel

## Udfordringer

## Devices

- [card-reader](#card-reader)
- [display](#display)
- [door-sensor](#door-sensor)
- [motion-sensor](#motion-sensor)

### Card reader

The card reader consists of an ESP8266 Wemos D1 Mini board and a PN-5180-NFC reader.
When a card is read the device sends a MQTT message to the broker.
The controller runnning on the Pi subscribes on the event and unlocks the door and if the alarm is armed disarms it.

The NFC reader reads the serial number of the NFC card or tag and transmits it, the controller checks the serial against a list of known serial numbers.

#### Source code

The source code can be found at https://git.bpfilip.dk/HFJ/alarm-card-reader

#### Hardware connections

| ESP8266 | PN-5180-NFC |
| ------- | ----------- |
| 3.3v    | 3.3v        |
| 5v      | 5v          |
| D1      | RST         |
| D2      | NSS         |
| D7      | MOSI        |
| D6      | MISO        |
| D5      | SCK         |
| D0      | BUSY        |
| GND     | GND         |

### Display

The display module consists 

#### Source code

The source code can be found at https://git.bpfilip.dk/HFJ/alarm-card-reader

#### Hardware connections

| ESP8266 | 16x2 LCD Display |
| ------- | ---------------- |
| 3.3v    | 3.3v             |
| GND     | GND              |