Humidity is presence of water vapor in air or soil. Too much or too less humidity is harmful for plants and for storage. So we need a Simple Humidity Level Detector Circuit. This small circuit uses only few parts and gives LED indication when humidity crosses a level. It can be used to test soil […]
Sensors and Detectors
Auto On Off Light Circuit for Washroom
In washroom many time people forget to switch OFF the light because of this there is waste of electricity. To solve this problem we can make a Auto On Off Light Circuit for Washroom. When someone presses the switch it detects the presence and light will turn ON for some time and then get OFF […]
Magnetic Proximity Switch Sensor Circuit
Magnetic Proximity Switch Sensor Circuit can feel magnetic field. It is used in factory, security and automation. Main part is magnetic reed switch as sensor. ICs like 555 timer and CD 4013 flip-flop turn relay ON/OFF when magnet is close by. Relay control other device ON/OFF. Circuit need stable 12V power for good working. Circuit […]
Sound-to-Beep Circuit using IC CD4049
Sound-to-Beep Circuit using IC CD4049 is a fun project. Hear whistle which beep for 3 sec. Circuit is good for door alarm, remote control other sound things. It has mic for sound, op-amps from CD4049 and transistor for buzzer. It runs on 3V battery. Circuit Working: Parts List: Component Type Value Quantity Resistors (All resistors […]
Simple Dark Sensor Circuit for Security using IC 555 timer
Simple Dark Sensor Circuit for Security using IC 555 timer is useful project for security. It senses low light and turns ON the buzzer or light. It is used for LDR as light sensing. Circuit is good for night light and alert system. The circuit have parts like 555 IC, LDR, resistors, capacitor and buzzer […]
Simple Dark Sensor Circuit with Buzzer
Simple Dark Sensor Circuit with Buzzer is a very easy project to make. It detect no light and makes sound. It is uses in night lights, security and alarms. Circuit works with LDR, 555 timer and buzzer. Low light makes buzzer ON. This circuit runs on 9V battery which is small and handy. Circuit Working: […]