Greetings, fellow Raspberry Pi enthusiasts.  We are about to create a multi-purpose gadget that is sure to impress!  My primary reason for building this to to control my Christmas lights, but that is only one of many possible uses.  Basically you can plug in up to 8 appliance and turn them on and off independantly from your smart phone!  If you want to setup port-forwarding on your wireless router, you can control your appliances from anywhere in the world.  (Although why you would want to turn on your blender from over-seas is a bit of a mystery.) Please leave me a comment letting me know how you use your Web Controlled Powerstrip!

Continue Reading…

Water-DropletWater pump controller senses the level of water in a tank and drives the water pump. The circuit described here is built around timer IC1 (555). When the water level of tank goes below the low level marked by ‘L’ the voltage at pin 2 of IC1 becomes low. As a result, internal SR-flip-flop of IC1 resets and its output goes high. This high output pin 3 of IC1 drives relay driver transistor T1 (BC547) and energies relay RL1. Water pump gets mains power supply through n/o contacts of the relay and is powered on. It starts filling water in the tank. Continue Reading…

Controlling Home appliances is the interesting thing. You can easily switch ON or OFF using remote with one touch. But it has limitations within range of IR. Here we see the controlling appliances via your phone SMS. Now you can control your devices from any part of the world. Send SMS “ON” to switch on your fan/lights or any devices. Continue Reading…