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Phone Basic Home Plate

Here I bring a very basic project on automation, control electrical appliances using PC .

In this case a 4-control 4N25 optocoupler with phototransistor connected to a connector to connect a board to electrically isolated power.

The main circuit consists of a PIC16F84A MCU based on a RS232 interface with MAX232 and a 2x16 LCD with Hitachi 44780 controller. The RS232 protocol should be set to 9600 bits per second, 1byte data, No parity, 2 stop bits and no flow control. (9600.1, N, 2, N). For the test, use the HyperTerminal that comes default on WindowsXP, but can be any other. Once inside the HyperTerminal and circuit connected to the PC via RS232 we can begin to activate its outputs. In this case, the buttons are activated [1] [2] [3] [4] and the [0] is disabled.

Then leave the circuit, and some pictures of the project.

This link all images are available but the source and compile.

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RS232 v1.0 PIC16F877A

This circuit is a coach for the PIC16F877A, which consists of a connector for each of its ports and contains the oscillator, Reset jumper and the power supply.

Jumper is responsible for putting under the RST at the MCU.

power supply operates on a positive regulator LM7805 that through the capacitor of 100nF 470uF/16V and achieves a good quality filter for the MCU, the 1N4007 diode was not the purpose of entering with current Alternatively, but this serves as input polarity protection, ie if we connect the source, the circuit works, but if you plug it into reverse, the diode can not be done in reverse feed the circuit.

below will show the circuit diagrams, component layout and PCB.

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MPT source converter simple symmetric continuous

The idea of \u200b\u200bthis circuit is to power supply circuits requiring symmetrical, but using simple source, so we use an operational amplifier to create symmetric complementary push-pull output created by the two medium-power transistor TIP31C (NPN) and TIP32C (PNP), the same must be dispelled and isolated from whether it should be mentioned that the charging circuit for this converter circuit should not be a mass market, is designed to feed a logic circuit which does not demand a large current flow. There is only

device calibration, which is done through the "Linear" 50K, this control allows us to create symmetry, the value of zero bone.

For a good calibration will require a voltmeter to see positive and negative voltage (the same one he was going to feed this circuit) found once proceed to put one end of the voltmeter to the point of the device gnd Hence we must read exactly half of the tension found above mind, if you do not read it until you find the potentiometer will vary.

eg the supply voltage of 12V device, we will see between 6V + B and GND and between GND and-B-6V.

Note: Do not exceed 15V power.

The circuit is as follows:

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The next project is an LED lamp with UPS, ie a lamp having UPS.
The circuit is very basic, is based on a source to power LEDs, a battery charger Gel and relay switch to double investor base.
As can be seen in the circuit, the relay coil is connected directly to the source that is fed from the power house, as soon as you connect the lamp to supply the relay will be activated, so you can say that there is energy in the house, because the relay is active, then go to feed the LEDs with controller 7812 and at the same time the battery starts to charge through the load resistor and diode.
When the lamp is disconnected from the mains or power failure, the relay is released by switching the battery from the charger to disconnect the LEDs and the LEDs 7812.
And when power is supplied again, the relay contacts are interlocked switching back and feeding the LEDs from the 7812 and charging the battery.