- PRODUCT DESCRIPTION
- FUNCTIONAL BLOCK DIAGRAM
- CIRCUIT DESCRIPTION
- CIRCUIT DIAGRAM
- LIST OF COMPONENTS
- PCB LAYOUT
- PCB FABRICATION
- SOLDERING PRACTICE
- DATA SHEETS
Remote control for home appliances is an absolute necessity in our fast-paced life. As a result, much important has been given to this aspect and a range of remote controls are prevalent today. One of the most common is that which makes use of IR radiations at particular frequencies.
Our product is a Remote Operated Home Appliance or Remote controlled Home appliance. The circuit is connected to any of the home appliances (lamp, fan, radio, etc) to make the appliance turn on/off from a TV, VCD, VCR, Air Conditioner or DVD remote control. The circuit can be activated from up to 10 meters. It is very easy to build and can be assembled on a general-purpose PCB.
The circuit essentially consists of a transmitter consisting of a 555 IC, the receiver consisting of an IR module, CD4017 IC, LED’s to indicate the reception of the IR radiations, otherwise indicating the ON/OFF state, relay and other components.
Connect this circuit to any of your home appliances (lamp, fan, radio, etc) to make the appliance turn on/off from a TV, VCD or DVD remote control. The circuit can be activated from up to 10 meters. The 38 kHz infrared (IR) rays generated by the remote control are received by IR receiver module TSOP1738 of the circuit. Pin 1 of TSOP1738 is connected to ground, pin 2 is connected to the power supply through resistor R5 and the output is taken from pin 3. The output signal is amplified by transistor T1 (BC558). The amplified signal is fed to clock pin 14 of decade counter IC CD4017 (IC1). Pin 8 of IC1 is grounded, pin 16 is connected to Vcc and pin 3 is connected to LED1 (red), which glows to indicate that the appliance is ‘off.’
The product consists of a remote which is the transmitter of the IR radiations and the receiver which responds to the radiations and switches ON and OFF the appliance.
The aim of this article is to get familiarized with the modern field of robotics and to find the technology know -how. Also here we are using the sophisticated emerging technology -embedded system. Here we have designed a robot arm, controlled by a microcontroller. We choose this deign because it is the most common form of robot we can find anywhere in industries like car assembling, bottling plant, packing section etc. The driver circuits for these motors are to be controlled using 8051 microcontroller with a control key panel. The movement is established using stepper motors. pick and place robots are the small robots using for continuous purpose in the industries then let us go through some thing about pick and place robot by this article .
WHAT IS A ROBOT?
Robot is any machine that does work on its own, automatically after it is programmed by humans. HISTORY OF ROBOTS:
The first robot’s name was Electro and his dog’s name was Sparko .They appeared at the New York world’s fair in 1939. While plugged in, Elektro could say 77 words and move backwards and forwards.
In1920’s, Karl Capek from Czechoslovakia introduced the words first robot on stage.
PICK AND PLACE ROBOT
We are going to design & implement a small model of pick and place robot, which pick and place object any where with in 360degrees and 30 cm diameters around it. The reason for choosing project is, the most extensively form of machine is used in most of the industries like car manufacturing, shipyards, assembling machine etc.
MICROCONROLLERS FOR EMBEDDED SYSTEMS
Microprocessors and microcontroller are widely used in embedded system products.
An embedded system is a system which is dedicated for a single purpose remains unchanged through out its entire life time. An embedded product uses a microprocessor (or microcontroller) to do one task and one task only.
A stepper motor is a widely used device that translates electrical pulses into mechanical movement. It is used for precise position control. # Increase or decrease the RPM (speed) of it.
To vary the RPM of motor we have to vary the PRF (Pulse Repetition frequency). Number of applied pulses will vary number of rotations and last to change direction we have to change pulse sequence.
The circuit mainly consists of three modules -control system, user interface module & a high voltage driver. A control system is nothing but the microcontroller. It has got the following modules.
- User Interface Module.
- Pulse Generator Module.
- Timing Control Module.
- Output Module.
When the keys are pressed the current flows directly to the ground due to the low resistive path making no more current available to the port pins pulling it down to low state, so when ever the keys are pressed the corresponding pins are pulled down. So normally every pin are at a high state giving a value of 1 when ever the keys are pressed the pins are to the low state giving the value 0.
This change is constantly monitored to check for any user interaction. The microcontroller constantly monitors port 0 for any change in port value and if it finds any change it generates the appropriate control signals. The stepper motor driver circuit consists of two stages-low power switching stage& high power switching stage. The function of the low power switching stage is to boost up the low power signal output from the micro controller to a high power signal so as to drive the power transistor.
Care should be taken while connecting the circuit to the motor as stepper has got a tendency to produce very high reverse current compared to DC motor.
To protect the circuit for this reverse current we have connected a diode in reverse bias across the coil supply so that whenever reverse current is present this diode will sink it protecting the circuit.
This project is an innovative solution to operate a machine / motor / liquid pumps for a small duration. If a machine is to be operated for ten minutes, and should be switched off after the duration, it is too difficult and many times we forget to switch it off the system after the prescribed time.
This project provides the facility of automatic switch off after the requited time duration. This is achieved by using the AT89S52 MCU. Four push-to-on switches are connected to one port of the microcontroller. These four switches are to provide four different fixed time constants.
A 16X2 LCD is connected to the microcontroller to display the status of the pump. Contrast of the LCD can adjusted by using a preset which is connected to it.
A transistor is used to drive the relay during the active time period. 5V double pole – double through relay is used to control the AC liquid pump. LED indication is provided for visual identification of the relay / load status. A switching diode is connected across the relay to neutralize the reverse EMF.
This project uses regulated 5V, 750mA power supply. Power on LED is connected for visual identification of power status. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac out put of secondary of 230/18V step down transformer.