esp8266_alarm_display

esp8266 arduino sketch to disable home assistant alarm using an RFID token and passcodes.

This little tool consists of an arduino sketch to flash onto your nodemcu and a python server component that listens to MQTT requests and responds if the UID is recognized and the alarm should be disabled.

I use it on a nodemcu combined with a MPC23017 GPIO expansion board to add the additional pins for my 4x3 matrix keypad and a MFRC522 RFID tag reader.

The authentication part is done using an mqtt listener server written in python that looks up the UID of the RFID token and the passcode in it's yaml settings configuration.

At the moment the alarmcode and the uid are send in plaintext to an MQTT topic. For me this is not safe enough for a "security" system, so I plan to add some psk encryption or use mqtt tls to prevent the uid and passcode to be send in plain text over the WIFI soon, but I'm still searching for some lightweight encryption libraries that run smoothly on the nodemcu.

Setup

Connect OLED

OLED Pin	ESP8266 Pin
GND	GND
VDO	3v3
SCK	D1
SDA	D2

Connect MPC23017 GPIO Expander

MPC23017 Pin	ESP8266 Pin
GND	GND
VCC	3v3
SCL	D1
SDA	D2

Connect MFRC522

RFID Pin	ESP8266 Pin
SDA	D4
SCK	D5
MOSI	D7
MISO	D6
RQ	N/C
GND	GND
RST	D3
3V3	3v3

Connect Keypad

MPC23017 Pin	keypad Pin
PA1	1
PA2	2
PA3	3
PA4	4
PA5	5
PA6	6
PA7	7

TODO

• Use PSK encryption to send the uid to the server and back to the nodemcu