Wiring Material: rain

Showing posts with label rain. Show all posts

Tuesday, September 23, 2014

Simple Rain Detector circuit and explanation

Heres a simple rain detector circuit. It uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system.

Rain Sensor and Alarm
The sensor made of a small piece of PC board etched to the pattern showen in the schematic. The traces should be very close to each other, but never touching. A large spiral pattern would also work. A loud buzzer used as an alarm.

Rain Detector Parts List

R1 = 1K 1/4 W Resistor
R2 = 680 Ohm 1/4 W Resistor
D1 = 1N4001 Silicon Diode
BZ1 = 12V Buzzer
S1 = SPST Switch
SCR1 = C106B1 SCR 106CY
SENSOR = See Notes
MISC = Board, Wire, Case, PC Board (For Sensor)

Tuesday, August 26, 2014

Rain and Water Alarm Wiring diagram Schematic

This is the schema diagram of Rain and Water Alarm schema. This schema generates alarm sound when its sensor is witted by water which make a short schema (connection) between X and Y. A tone of about 1kHz which can be hear while detecting water, is provided by a stable multivariate from timer IC 555.

The sensor when witted by water completes the schema and causes the 555 oscillate at about 1kHz. It has to placed generating an angle of about 30 – 45 degrees to the ground. This tends to make the rain water to flow over it towards the ground and prevents the alarm from going on because of the stored water on top of the sensor.

The metal implemented for making the sensor is required to be aluminum and not copper. This is simply because copper forms a blue oxide on its layer on prolonged exposure to moisture and needs to be cleaned on a regular basis.The aluminum foils may be secured to the wooden / plastic board via epoxy adhesive or small screws. The connection between X and Y from the sensor may be obtained by small crocodile clips or you could possibly use screws.

Rain and Water Alarm Circuit Diagram