Load Program For At89C51 Ic Full Range Of

Wireless technology is wireless communication network which is micro wave network or electromagnetic wave as the transmission media.

It is connected to the LCD module, input switches and encoder IC (HT12E).

The device control program is stored in the memory of the microcontroller to control the devices as per the time out settings done through input switches S1 through S4.

The HT12E is an 18 pin DIP package encoder IC that encodes 4-bit data and sends it to the TRX -434 RF transmitter modules.

In this technique, whenever logic 1 is to be sent, it is modulated with carrier signal (434 MHz).

This modulated signal is then transmitted through the antenna.

It makes easer process of change in amount of equipment controlled.

SCR controls the output signal by switching it on or off, thereby controlling the power to the load in context.

The two primary modes of SCR control are phase-angle firedwhere a partial waveform is passed every half cycleand zerocrossing firedwhere a portion of the complete waveforms is passed to regulate the power.

In the phase angle controller, the firing pulse is delayed to turn on the SCR in the middle of every half cycle.

This means that every time a part of an AC cycle is cut, the power to the load also gets cut.

To deliver more or less power to the load, the phase angle is increased or decreased, thereby controlling the throughput power.

This article describes a microcontroller AT89C51-based phase angle controller.

Load Program For At89C51 Ic Full Range Of

A microcontroller can be programmed to fire SCR over the full range of half cyclesfrom 0 to 180to get a good linear relationship between the phase angle and the delivered output power.

The user can increase or decrease the delay in intervals of 1 ms using switches.

The main sections of the circuit are a rectifier, regulated power supply and zero-crossing detector.

The 230V AC mains is stepped down by transformer X1 to deliver the secondary output of 9V, 500 mA.

The transformer output is rectified by a full-wave bridge rectifier comprising diodes D1 through D4 and then regulated by IC 7805 (IC3).

Capacitors C2 and C3 are used for bypassing the ripples present in the regulated 5V power supply.

A capacitor above 10F is connected across the output of the regulator IC, while diode D6 protects the regulator IC in case their input is short to ground.

LED5 acts as the power-on indicator and resistor R5 limits the current through LED5.

A pulsating DC voltage is applied to the base of transistor T1 through diode D5 and resistors R1 and R2.

When the pulsating voltage goes to zero, the collector of transistor T1 goes high.

This is used for detecting the pulse when the voltage is zero.

Finally, the detected pulse from C is fed to the microcontroller of the control section.

It comprises a microcontroller AT89C51, opto-coupler MCT2E, LCD module and a few discrete components.

Port 0 (P0.0 through P0.7) of AT89C51 is used for interfacing data input pins D0 through D7 of the LCD module.Port pins P2.6, P2.5 and P2.7 of the microcontroller control the registers select (RS), readwrite and enable (E) input pin of the LCD module, respectively.

Preset VR1 is used for controlling the contrast of the LCD module.

Push-to-on switches S1, S2 and S3 are connected with the pins P1.0, P1.1 and P1.2 through diodes D9, D10 and D11, respectively.

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How To Load Program For At89C51 Ic