One of my friends asked me if I could design a circuit for him to be able to remotely power up a server. He has 2 servers and he didn`t want to keep them both on whilst he travelled. He wanted to be able to turn on a server when he needed it. He has one server which is on all the time (web server) to which he RDPs occasionally. The project involve
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d a microcontroller circuit with RS232 interface and a simple application to send messages to it in real time. Since the MCU has multiple I/O pins it would be a waste to control only one server, so I have designed this project to control up to 5 servers/devices. I have thought about getting power from PCI socket but opted against it as the motherboard slots change very often. This way you can use this card in any PC or Server. I have chosen to use PIC16F628 for the project as it is the first one to introduce an internal oscillator. This saves cost as there is no need for crystal or caps. The Remote Control Server application is written in VB6. It sends real time button state messages to the MCU over a standard RS232 serial port (USB to RS232 cable can also be used if your laptop or PC has no serial ports). By default the application will open up in Mini mode (second picture above). All the settings are saved in the registry so you don`t need to configure the settings every time you run it up. The names for the buttons are configurable in the Configuration window. By clicking the labels "Momentary" or "Latched" will toggle between the two modes of operation. By pressing "Cancel" button on configuration screen will apply the changes but will not save them in registry so next time you start the application it will revert to last saved settings. Application is designed to reflect the current state of the button. In "Momentary"...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
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The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
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In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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