Just move hand in front of this Liquid soap dispenser. You get few drops of liquid soap for hand wash. Made it Non contact to prevent hand contamination from the press handle of the dispenser if it is used in common places.
A Simple Water level indicator circuit indicating 5 stage water levels in the tank. LED1 glows when the water tank is empty. LED 5 glows when the tank is full. LED 2 indicated 40%, LED 3 indicates 60% and LED 4 indicates 80% water in the tank. LEDs glows one by one when the water tank fills and turns off one by one when the water level drops.
PIR Sensor Alarm
This simple alarm can be used to detect the movement of human beings at a distance of 10 meters. It works both day and night and beeps shortly when there is a human movement through its detecting range. It is ideal to monitor the entry passages, stair case, corridors etc. It is highly useful to monitor the human movements in Flats, Multi storied buildings, Shops etc. A relay can also be connected for activating lights, electric alarms etc. It can be used as a Personal alarm during journey to protect luggage.
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Ultrasonic Pest Chaser
Here is an efficient Electronic Pest Repellent to chase Pests from home. It emits Ultrasound in the frequency 9 to 96 kHz which can be set for each Pest. Human can’t here the Ultrasound since it is out of human sound detection range. But most animals can hear Ultrasound.The circuit emits powerful Ultrasound to repel pests.
Mosquitoes are usually repelled between 20 and 40 kHz, Rats around 56 kHz, Cockroaches around 36 kHz and Flies around 30 kHz. Out put power of the circuit is 2 watts 1.3 dB. It can repel Mosquitoes, Rats, Cockroaches, Wall Lizards , House flies etc from home. Made and found effective.
Here is an efficient battery charger for Car battery and Inverter battery. It quick charges the battery with 5 Ampere current and cut off charging when the battery attains 13.8 V which is the full charge condition of the Lead Acid battery. Red LED indicates charging process while Green LED indicates full charge and charger cut off status.
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