Digital Fan Regulator Circuit

The circuit presented here is that of a digital fan regulator, variable  to provide five speed levels as catered for in ordinary fan regulators. The circuit of ceiling fan controller makes use of easily available components. An optional 7-segment display with its associated electronic circuitry has been provided to display your choice of fan speed.

PC Based Wireless Stepper Motor control Circuit

Stepper motors find lots of applications in process control, machine tools and robotics. Especially in robotics and process control, bit is necessary to control the stepper motor from a remote place. Here you will get the transmitter and receiver circuit diagrams and Full source code for the application program.

Here we describe how to wirelessly control a stepper motor from a remote place by using RF modules. For this wireless stepper-motor control system, you need to design and develop the required hardware and software. The parallel port of the PC is used to control the direction of the stepper motor at the transmitter side. RF interface is used instead of IR to overcome all the drawbacks of the IR interface. The PC signals are transmitted from the RF transmitter and received by the RF receiver.

Seismic Sensor Circuit

This circuit is a very sensitive seismic sensor that detects vibrations/sounds. It can detect seismic vibration or sounds caused by animals or humans. So it can be used to monitor protected areas to restrict entry of unwanted persons or animals.

Laser Switch With Timer

This circuit is a laser controlled relay switch with timer that can be made using readily available components. This laser switch has the following advantages :

• Timed operation - Turn on time of the switch can be controlled
• Large current handling capability, can control a motor
• Stand by and operating mode led indication
• operating mode Piezo alert.

Rotation Sensor Circuit Using 555

The picture shows the circuit diagram of a rotation sensor that can turn on a device like motor or buzzer while the circuit assembly rotates. The circuit is based on basic 555 timer operation.

Simple Low Cost Digital Thermometer Circuit

The circuit diagram shows the simplest form of a digital thermometer which can measure temperatures up to 150°C with an accuracy of ±1°C. This digital thermometer circuit is of low cost because the reading portion of this equipment is done by a 1V full scale deflection digital voltmeter.

Motion Sensor For Security Light Using PIR BS1600

Here's the circuit diagram based on PIR motion sensor module BS1600 (or BS1700) that can be used for security lighting in power saving mode.(If you could not found  one in your local store ,  buy PIR motion sensor online).The special advantage of this motion detector circuit is it doesn't need any transformers in power supply section. The 12V DC required for feeding the motion sensor and driving relay is derived directly from the mains supply.

Temperature Controller For PC

 Click here to read best computer temperature control methods

Our computer may often heated up due to long use or the hot climate, temperature controllers are necessary.  You need to do a temperature measurement to ensure that the computer is work within the allowed range. To reduce pc temperature, here is circuit diagram of a simple temperature controller for your personal computer (PC) based on a temperature sensor LM35 and a comparator CA3140. The circuit turns off the PC when the temperature of the computer increases beyond a particular, optimum temperature value. This avoids overheating of some integrated chips (IC) that may not be able to dissipate heat fast enough.

Water Tank Controller Circuit

Here is an automatic water tank controller that controls the operation of a water pump through a 12V 10amp relay. When ever the water level of the tank short circuits the points A and B in the circuit diagram, the pump get turned off automatically. This home water pump controller circuit is comparably simple and low cost and can be assembled easily on a common PCB.