Smart water leak sensor

thingiverse

These intelligent sensors track water leaks by measuring resistance between two contacts, which are typically two M3 bolts. When a water leak is detected, several actions occur: Local alarm goes off with loud piezo buzzer signals and blinking red LED lights. All other identical water sensors throughout the house also sound their alarms, using loud piezo buzzer signals and a sequence of red LED flashes that indicates which sensor detected the leak. This requires WiFi and MQTT server capabilities. The alarm is displayed in the OpenHAB browser interface, accessible on smart phones or other devices. This feature necessitates WiFi, MQTT server, and OpenHAB server functions. An email is sent to a predefined email address when an alarm occurs. For this to work, WiFi, MQTT server, and OpenHAB server with the Mail action add-on are required. Once the alarm sounds, pressing any sensor's button will silence all alarms for 30 seconds by default. Only the buzzer is silenced; the rest of the sensor continues functioning normally, including water detection, red LED alerts, OpenHAB notifications, and emails. After 30 seconds have passed since the last leak detection, if the leak persists, the alarm goes off again on all sensors. If the water leak is no longer present, all alarms are canceled. A green LED turns on when a WiFi connection is established. If an MQTT connection cannot be established, the green LED flashes slowly. If a sensor is short-circuited, its piezo and red LEDs will chirp every 5 seconds. Power is supplied to the sensor via micro USB at 5 volts. The total cost for all necessary parts is approximately $6. For further information on this smart water leak sensor, including schematics and code, visit https://pulsar124.fandom.com/wiki/Smart_water_leak_sensor. Changes made to accommodate version 2 of the top and bottom enclosure parts include using M3 bolts and nuts instead of screws for assembly.