Sms Remote Car

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This is my quick build schematic. (Click to see the entire thing) The voltage divider on the left is so that the arduino can report the system voltage. it’s made of 3 10k resistors since I always have those on hand. The result is 1/3 of the 12-14v DC that the car has. From this, we can infer the state of the car: >13 is started. I plan to toss in a ds180 1 wire temp sensor later on as well. The pink highlighter was used as I wired things up.


Web-Based programmable logic control (PLC)

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Today there are very rapid development of technology and progress, these developments require humans to continue to innovate to create tools that can help in performing daily activities.

Many activities to do outside the home who sometimes have to leave home until the days and – days. Usually we always turn out the lights when leaving the house empty. This could cause the waste of electrical energy consumption for lighting during the day alive, and will also lead to vulnerability to theft because the house is seen in a state of no activity. To overcome this, the authors sought to create control systems electrical installations are cheap and easy to apply.
This application which will manage all electrical systems to manipulate the situation as if uninhabited, except that this application will replace our work in the light turn on and off every day. Therefore, the authors tried to examine and make the “Applications Web-Based Control Electrical Equipment OpenWRT”.
OpenWRT is an operating system (actually more properly called Firmware) that can be installed (more precisely planted / in-embedded) on a wireless radio device. OpenWRT is to replace the function of a PC is usually used in the application of programmable logic control (PLC), as an OpenWRT operating system can be installed with various applications such as web server and PHP. With this capability makes the “Applications Web-Based Control Electrical Equipment OpenWRT” is very flexible and low cost. Another capability of this application is able to control your home from anywhere are, as long as it can be connected to the internet.

Author : puguh




simple FSK Demodulator

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Here is application of the 565 PLL is as a FSK demodulator. In the 565 PLL the frequency shift is usually accomplished by driving a VCO with the binary data signal so that the two resulting frequencies corre­spond to the logic 0 and logic 1 states of the binary data signal. The frequencies corresponding to logic 1 and logic 0 states are commonly called the mark and space frequencies. Several standards are used to set the mark and space frequencies.

The demodulator receives a signal at one of the two distinct carrier frequencies, 1,270 Hz or 1,070 Hz representing the RS-232 C logic levels of mark (- 5 V) or space (+ 14 V), respectively. Capacitance coupling is used at the input to remove a dc level.

Simple Light Switch circuit

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This circuit build using Op Amp 741, Though designs vary between products and manufacturers, all op-amps have basically the same internal structure, which consists of three stages:

  1. Differential amplifier – provides low noise amplification, high input impedance, usually a differential output.
  2. Voltage amplifier – provides high voltage gain, a single-pole frequency roll-off, usually single-ended output.
  3. Output amplifier – provides high current driving capability, low output impedance, current limiting and short circuit protection circuitry.

in this circuits Op-Amp 741 working as Voltage amplifier

Relay close when no light fall on LDR1, if you want reversed action please exchange LDR1 and R1 and sensitivity can be adjusted with P1, D1 prevents sparking relay coil when it open.