Arduino Fan/MQTT message broker

Fun small project for making a fan spin using a local MQTT message broker mosquitto.

Set Up

• Mosquitto installed using brew
• Source fan.sh script
• Create a secrets.h file in the same directory as the fan.ino script with the following format:

#define SECRET_SSID "<WIFI SSID>"
#define SECRET_PASSWORD "<WIFI password>"
#define SECRET_MQTT_BROKER "<IP address of network>"
#define SECRET_MQTT_PORT <MQTT port>

Start fan topic

Run MQTT_START

Sub to fan topic

Run MQTT_SUB fan/topic

Pub to fan topic

Run MQTT_SUB fan/topic <message>

Accepted pub messages

Message	Outcome	Outcome
0 $\leq$ x $\leq$ 255	Sets fan duty cycle to x	MQTT_SUB fan/topic 100
ON	set duty cycle to 100	MQTT_SUB fan/topic ON
OFF	set duty cycle to 0	MQTT_SUB fan/topic OFF
FLIP	reverse rotation of fan, keeps same duty cycle	MQTT_SUB fan/topic FLIP

Note: The accepted messages must either be between 0 and 255 or match ON, OFF, or FLIP exactly (case sensitive).

Components used

• ESP8266 board
• Fan blade and 3-6V motor
• L298N
• Power connector
• 104pF Ceramic Capacitor

Resources used

• For the circuitry