11-09-2014, 10:51 AM
CELLPHONE CONTROLLED ROBOT
[attachment=67813]
ABSTARCT
You may have come across many schematics and projects about a cell phone controlled land rover in many websites. But this is not the same. This article will show you how to make a cell phone controlled land rover without using a microcontroller. You read it right we are not going to use any kind of costly microcontroller for making the rover.
We’ll just need a DTMF decoder MT8870 and a motor driver L293d for making it. So no circuit complexity, no costly ICs and no programming requiredCELLPHONE CONTROL ROBOT is a machine that can be controlled with a mobile . In this project, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot. In the course of a call, if any button is pressed, a tone corresponding to the button pressed is heard at the other end of the call. This tone is called "Dual Tone Multiple-Frequency" (DTMF) tone.
The robot perceives this DTMF tone with the help of the phone stacked on the robot. The received tone is processed by the microcontroller with the help of DTMF decoder. The microcontroller then transmits the signal to the motor driver ICs to operate the motors & our robot starts moving Conventionally, Wireless-controlled robots use rf circuits, which have the drawbacks of limited working range, limited frequency range and the limited control. Use of a mobile phone for robotic control can overcome these limitations. It provides the advantage of robust control, working range as large as the coverage area of the service provider, no interference with other controllers and up to twelve controls. Although the appearance and the capabilities of robots vary vastly, all robots share the feature of a mechanical, movable structure under some form of control.
INTRODUCTION
Now, your robot is ready to operate wirelessly with GSM facility once you make a call to the cell phone connected to the robot. By pressing the number keypads in the your cell phone, you will be able to move the robot in various directions.
It is made possible with the help of Dual Tone Multi Frequency receiver (IC CM8870), in which the sleeve connection of the robot cell phone is connected to the IC CM8870. The tone received from your cell phone to the robot cell phone will be converted into binary form, and suitable output is provided by the IC CM8870 to IC L293D.
In this project the robot, is controlled by a mobile phone that makes call to the mobile phone attached to the robot in the course of the call, if any button is pressed control corresponding to the button pressed is heard at the other end of the call.
This tone is called dual tone multi frequency tome (DTMF) robot receives this DTMF tone with the help of phone stacked in the robot The received tone is processed by the atmega16 microcontroller with the help of DTMF decoder MT8870 the decoder decodes the DTMF tone in to its equivalent binary digit and this binary number is send to the microcontroller, the microcontroller is preprogrammed to take a decision for any give input and outputs
its decision to motor drivers in order to drive the motors for forward or backward motion or a turn. The mobile that makes a call to the mobile phone stacked in the robot acts as a remote. So this simple robotic project does not require the construction of receiver and transmitter units.
DTMF signaling is used for telephone signaling over the line in the voice frequency band to the call switching center. The version of DTMF used for telephone dialing is known as touch tone. DTMF assigns a specific frequency (consisting of two separate tones) to each key s that it can easily be identified by the electronic circuit. The signal generated by the DTMF encoder is the direct algebraic submission, in real time of the amplitudes of two sine (cosine) waves of different frequencies, i.e., pressing 5 will send a tone made by adding 1336 Hz and 770 Hz to the other end of the mobile.
The important components of this robot are DTMF decoder, Microcontroller and motor driver. An MT8870 series DTMF decoder is used here. All types of the mt8870 series use digital counting techniques to detect and decode all the sixteen DTMF tone pairs in to a four bit code output.
The built -in dial tone rejection circuit eliminated the need for pre- filtering. When the input signal given at pin2 (IN-) single ended input configuration is recognized to be effective, the correct four bit decode signal of the DTMF tone is transferred to Q1 (pin11) through Q4(pin14) outputs.
COMPONENTS LIST
Components Used
The components used in making this robot are easily available in electronic markets and very cost effective too. The following list provides the complete component requirements of this robot
• 12V DC Motor (100 RPM)
• Breadboard – 1
• IC L293D – 1
• IC CM8870 – 1
• 9V Battery – 1 (Requires according to the usage)
• Plastic Wheels – 2 or 4 (Based on the chassis)
• 10 µf Capacitors – 2
• 0.1 µf Capacitors – 2
• 3.58 MHz Oscillator – 1
• 1K Resistor – 1
• 100 K Resistor – 2
• 300 K Resistor – 1
• Universal Headphone Jack – 1
• LED – 1
• Battery Holder – 1
• Battery Snap – 1
12 volt dc motor
Features
• 100RPM 12V DC motors with Gearbox
• 3000RPM base motor
• 6mm shaft diameter with internal hole
• 125gm weight
• Same size motor available in various rpm
• 1.2kgcm torque
• No-load current = 60 mA(Max), Load current = 300 mA(Max)
9v Battery
The 9v battery also referred to as a PP3 battery, appeared when portable transistorized radio receivers became common, and is still called a ‘transistor’ battery by some manufacturers. PP3 actually refers to the type of connection or snap that is on top of the battery. It is shaped as a rounded rectangular prism and has a nominal output of nine volts.
There are other nine volt batteries, such as PP7 and PP9. These date from the days of early transistor radios and are now less common than PP3. In the days of valve radios, there was a nine volt grid bias battery which had tapping for various voltages between 1.5 and 9.
The 9v batteries are commonly used in smoke detector which detects smoke and issues a signal to a fire alarm system, or issues a local audible and also visual alarm from the detector itself, also in guitar effect units, pocket radios, and in control systems.
A control system is a device or set of devices to manage, command, direct or regulate the behavior of other devices or systems.
There are two common classes of control systems, with many variations and combinations: logic gate, and feedback or linear controls. It is used in Radio control in which it is used for radio signals to remote control a device from a hand-held radio transmitter and it is also used in vehicle controllers
They are also utilized as backup power to keep the time in digital clocks wherein time is displayed digitally as opposed to analog clock, where the time is displayed in hands and alarm clocks.
Functional Description
The CAMD CM8870/70C DTMF Integrated Receiverprovides the design engineerwith not only low powerconsumption, but high performance in a small 18pinDIP, SOIC, or 20-pin PLCC package configuration.
TheCM8870/70C’s internal architecture consists of aband-split filter section which separates the high and lowtones of the received pair, followed by a digital decode(counting) sectionwhich verifies both the frequency andduration of the received tones beforepassing theresultant 4-bit code to the output bus.
Filter Section
Separation of the low-group and high-group tones isachieved by applying the dual-tone signal to the inputs oftwo 9th-order switched capacitor bandpass filters. Thebandwidths of these filters correspond to the bandsenclosing the low-group and high-group tones
The filter section also incorporates notches at350Hz and 440Hz which provides excellent dial tonerejection. Each filter output is followed by a single orderswitched capacitor section which smooths the signalsprior to limiting. Signal limiting is performed by high-gain
Step by Step Instructions
1) Power Supply:
• Take the breadboard and connect the battery holder in horizontal position.
• Insert the positive and negative wire of battery snap in holder.
• Attach IC 7805 (Voltage Regulator), and place one 10 µF capacitor in IN & GND connection of IC 7805 and other in GND & OUT connection.
• Take the positive supply from the battery holder via breadboard wire and place it in IN of IC 7805, and also connect its negative supply in the last row of the breadboard.
• Place the GND of IC 7805 in the last row of the breadboard, and transfer its OUT to the first row of the breadboard.
• As a result of these connections, +5V power is obtained in the first row of the breadboard.
• To check the power flow path, an LED is given a positive supply via 1K Resistor.
2) IC CM8870 Connections:
• Connect 1st & 4th pin of CM8870 (DTMF Receiver) together.
• Pick one 100K resistor and place one side of it in 2nd pin and other side to the 0.1 µf capacitor.
• Pick another 100K resistor and connect 3rd and 2nd pin.
• Provide GND connection to 5th, 6th, and 9th pins.
• Couple 7th and 8th pins with 3.58 MHz Oscillator.
• Provide +5V supply to 10th and 18th pins.
• Take one 300K resistor, and place one side of it to 16th pin and other to 0.1 µf capacitor from 17th pin.
• Connect 0.1 µf capacitor to the 18th pin.
Working:
After completing the construction, connect the circuit with 9V battery. Also, connect the universal headphone jack to its respective cell phone with incoming facility. Activate auto-answer mode in the cell phone before connecting it to the circuit, and enable keypad tones in the cell phone that you use to make calls.
Now, your robot is ready to operate wirelessly with GSM facility once you make a call to the cell phone connected to the robot. By pressing the number keypads in the your cell phone, you will be able to move the robot in various directions.
It is made possible with the help of Dual Tone Multi Frequency receiver (IC CM8870), in which the sleeve connection of the robot cell phone is connected to the IC CM8870. The tone received from your cell phone to the robot cell phone will be converted into binary form, and suitable output is provided by the IC CM8870 to IC L293D.
Conclusion
I hope the above information will be very useful for developing your own robot with simple and cost-effective wireless connection. If you have any suggestions or doubts regarding this robot, please do let me know by just sending a mail to Denis javel[at]gmail.com
[attachment=67813]
ABSTARCT
You may have come across many schematics and projects about a cell phone controlled land rover in many websites. But this is not the same. This article will show you how to make a cell phone controlled land rover without using a microcontroller. You read it right we are not going to use any kind of costly microcontroller for making the rover.
We’ll just need a DTMF decoder MT8870 and a motor driver L293d for making it. So no circuit complexity, no costly ICs and no programming requiredCELLPHONE CONTROL ROBOT is a machine that can be controlled with a mobile . In this project, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot. In the course of a call, if any button is pressed, a tone corresponding to the button pressed is heard at the other end of the call. This tone is called "Dual Tone Multiple-Frequency" (DTMF) tone.
The robot perceives this DTMF tone with the help of the phone stacked on the robot. The received tone is processed by the microcontroller with the help of DTMF decoder. The microcontroller then transmits the signal to the motor driver ICs to operate the motors & our robot starts moving Conventionally, Wireless-controlled robots use rf circuits, which have the drawbacks of limited working range, limited frequency range and the limited control. Use of a mobile phone for robotic control can overcome these limitations. It provides the advantage of robust control, working range as large as the coverage area of the service provider, no interference with other controllers and up to twelve controls. Although the appearance and the capabilities of robots vary vastly, all robots share the feature of a mechanical, movable structure under some form of control.
INTRODUCTION
Now, your robot is ready to operate wirelessly with GSM facility once you make a call to the cell phone connected to the robot. By pressing the number keypads in the your cell phone, you will be able to move the robot in various directions.
It is made possible with the help of Dual Tone Multi Frequency receiver (IC CM8870), in which the sleeve connection of the robot cell phone is connected to the IC CM8870. The tone received from your cell phone to the robot cell phone will be converted into binary form, and suitable output is provided by the IC CM8870 to IC L293D.
In this project the robot, is controlled by a mobile phone that makes call to the mobile phone attached to the robot in the course of the call, if any button is pressed control corresponding to the button pressed is heard at the other end of the call.
This tone is called dual tone multi frequency tome (DTMF) robot receives this DTMF tone with the help of phone stacked in the robot The received tone is processed by the atmega16 microcontroller with the help of DTMF decoder MT8870 the decoder decodes the DTMF tone in to its equivalent binary digit and this binary number is send to the microcontroller, the microcontroller is preprogrammed to take a decision for any give input and outputs
its decision to motor drivers in order to drive the motors for forward or backward motion or a turn. The mobile that makes a call to the mobile phone stacked in the robot acts as a remote. So this simple robotic project does not require the construction of receiver and transmitter units.
DTMF signaling is used for telephone signaling over the line in the voice frequency band to the call switching center. The version of DTMF used for telephone dialing is known as touch tone. DTMF assigns a specific frequency (consisting of two separate tones) to each key s that it can easily be identified by the electronic circuit. The signal generated by the DTMF encoder is the direct algebraic submission, in real time of the amplitudes of two sine (cosine) waves of different frequencies, i.e., pressing 5 will send a tone made by adding 1336 Hz and 770 Hz to the other end of the mobile.
The important components of this robot are DTMF decoder, Microcontroller and motor driver. An MT8870 series DTMF decoder is used here. All types of the mt8870 series use digital counting techniques to detect and decode all the sixteen DTMF tone pairs in to a four bit code output.
The built -in dial tone rejection circuit eliminated the need for pre- filtering. When the input signal given at pin2 (IN-) single ended input configuration is recognized to be effective, the correct four bit decode signal of the DTMF tone is transferred to Q1 (pin11) through Q4(pin14) outputs.
COMPONENTS LIST
Components Used
The components used in making this robot are easily available in electronic markets and very cost effective too. The following list provides the complete component requirements of this robot
• 12V DC Motor (100 RPM)
• Breadboard – 1
• IC L293D – 1
• IC CM8870 – 1
• 9V Battery – 1 (Requires according to the usage)
• Plastic Wheels – 2 or 4 (Based on the chassis)
• 10 µf Capacitors – 2
• 0.1 µf Capacitors – 2
• 3.58 MHz Oscillator – 1
• 1K Resistor – 1
• 100 K Resistor – 2
• 300 K Resistor – 1
• Universal Headphone Jack – 1
• LED – 1
• Battery Holder – 1
• Battery Snap – 1
12 volt dc motor
Features
• 100RPM 12V DC motors with Gearbox
• 3000RPM base motor
• 6mm shaft diameter with internal hole
• 125gm weight
• Same size motor available in various rpm
• 1.2kgcm torque
• No-load current = 60 mA(Max), Load current = 300 mA(Max)
9v Battery
The 9v battery also referred to as a PP3 battery, appeared when portable transistorized radio receivers became common, and is still called a ‘transistor’ battery by some manufacturers. PP3 actually refers to the type of connection or snap that is on top of the battery. It is shaped as a rounded rectangular prism and has a nominal output of nine volts.
There are other nine volt batteries, such as PP7 and PP9. These date from the days of early transistor radios and are now less common than PP3. In the days of valve radios, there was a nine volt grid bias battery which had tapping for various voltages between 1.5 and 9.
The 9v batteries are commonly used in smoke detector which detects smoke and issues a signal to a fire alarm system, or issues a local audible and also visual alarm from the detector itself, also in guitar effect units, pocket radios, and in control systems.
A control system is a device or set of devices to manage, command, direct or regulate the behavior of other devices or systems.
There are two common classes of control systems, with many variations and combinations: logic gate, and feedback or linear controls. It is used in Radio control in which it is used for radio signals to remote control a device from a hand-held radio transmitter and it is also used in vehicle controllers
They are also utilized as backup power to keep the time in digital clocks wherein time is displayed digitally as opposed to analog clock, where the time is displayed in hands and alarm clocks.
Functional Description
The CAMD CM8870/70C DTMF Integrated Receiverprovides the design engineerwith not only low powerconsumption, but high performance in a small 18pinDIP, SOIC, or 20-pin PLCC package configuration.
TheCM8870/70C’s internal architecture consists of aband-split filter section which separates the high and lowtones of the received pair, followed by a digital decode(counting) sectionwhich verifies both the frequency andduration of the received tones beforepassing theresultant 4-bit code to the output bus.
Filter Section
Separation of the low-group and high-group tones isachieved by applying the dual-tone signal to the inputs oftwo 9th-order switched capacitor bandpass filters. Thebandwidths of these filters correspond to the bandsenclosing the low-group and high-group tones
The filter section also incorporates notches at350Hz and 440Hz which provides excellent dial tonerejection. Each filter output is followed by a single orderswitched capacitor section which smooths the signalsprior to limiting. Signal limiting is performed by high-gain
Step by Step Instructions
1) Power Supply:
• Take the breadboard and connect the battery holder in horizontal position.
• Insert the positive and negative wire of battery snap in holder.
• Attach IC 7805 (Voltage Regulator), and place one 10 µF capacitor in IN & GND connection of IC 7805 and other in GND & OUT connection.
• Take the positive supply from the battery holder via breadboard wire and place it in IN of IC 7805, and also connect its negative supply in the last row of the breadboard.
• Place the GND of IC 7805 in the last row of the breadboard, and transfer its OUT to the first row of the breadboard.
• As a result of these connections, +5V power is obtained in the first row of the breadboard.
• To check the power flow path, an LED is given a positive supply via 1K Resistor.
2) IC CM8870 Connections:
• Connect 1st & 4th pin of CM8870 (DTMF Receiver) together.
• Pick one 100K resistor and place one side of it in 2nd pin and other side to the 0.1 µf capacitor.
• Pick another 100K resistor and connect 3rd and 2nd pin.
• Provide GND connection to 5th, 6th, and 9th pins.
• Couple 7th and 8th pins with 3.58 MHz Oscillator.
• Provide +5V supply to 10th and 18th pins.
• Take one 300K resistor, and place one side of it to 16th pin and other to 0.1 µf capacitor from 17th pin.
• Connect 0.1 µf capacitor to the 18th pin.
Working:
After completing the construction, connect the circuit with 9V battery. Also, connect the universal headphone jack to its respective cell phone with incoming facility. Activate auto-answer mode in the cell phone before connecting it to the circuit, and enable keypad tones in the cell phone that you use to make calls.
Now, your robot is ready to operate wirelessly with GSM facility once you make a call to the cell phone connected to the robot. By pressing the number keypads in the your cell phone, you will be able to move the robot in various directions.
It is made possible with the help of Dual Tone Multi Frequency receiver (IC CM8870), in which the sleeve connection of the robot cell phone is connected to the IC CM8870. The tone received from your cell phone to the robot cell phone will be converted into binary form, and suitable output is provided by the IC CM8870 to IC L293D.
Conclusion
I hope the above information will be very useful for developing your own robot with simple and cost-effective wireless connection. If you have any suggestions or doubts regarding this robot, please do let me know by just sending a mail to Denis javel[at]gmail.com