In this article we will tell you how you can turn on household electrical appliances using mobile phone.
Mobile phones are improving all the time, and not only the design is changing. Old model phones, having lost demand, gather dust among household items, or, at best, are sold for a symbolic price. But a cell phone has a lot hidden possibilities! Besides that your cellular telephone, can be used by law enforcement agencies to spy on you, there are also more “pleasant” opportunities just for you. We will talk about using a mobile phone to perform tasks that are not typical for it.
Without major modifications, any mobile phone can be used as a device that turns on or off another device with a phone call. This device can be any household appliance - a kettle, an iron, a heater, electric lamps, or even an electric heater in the steam room of your country sauna.
Imagine that you are at home in the morning, and you just need to turn on the heating device at work, because the utility companies do not heat your office well. Having previously remembered kind words utility workers and calling your “assistant”, you show up at work in a couple of hours, and you are pleasantly pleased with the warm room.
The principle of operation is as follows: Inside any mobile (cellular) phone there is a small micromotor, on the shaft of which an eccentric is attached. This micromotor is responsible for the “vibration” mode of the phone. During a call, this motor receives constant voltage, it turns the metal eccentric, and since the motor is attached to the phone, the entire device vibrates. In order for you to understand what this motor looks like, I provide a photo of two motors from different phones against the background of a matchbox. It is necessary to turn off this motor, and bring the wires going to it out through an additional connector, or simply directly - with wires. The power control circuit shown below must be connected to these wires.
The scheme is simple, and no additional settings does not require, if assembled correctly, it starts working immediately.
The entire circuit is powered through limiting capacitor C2, rectifier VD4-VD7, limiting resistor R7. Designed to smooth out mains voltage ripples electrolytic capacitor C1. To limit the secondary voltage in amplitude and, as a consequence, protect against breakdown of optocoupler D1, transistor VT1 and capacitor C1 with a voltage that may exceed the maximum permissible value Uke, a zener diode VD3 is used. It limits the power supply to the circuit at its stabilization voltage level.
When a vibration alert appears on the phone, optocoupler D1, transistor VT1 and thyristor VS1 open. An open thyristor turns on relay P1. At the end of the call, the thyristor remains open, therefore relay P1 remains turned on. The circuit is returned to its original (off) state by pressing the S1 button. The thyristor's current is interrupted and it turns off. To control the operation of the device, there is a VD2 LED, indicating that the relay is turned on.
The circuit shown works on inclusion load but the phone rings, but if the wire going to the load socket is switched from pin 3 to pin 2 of the contact group of relay P1.2, then the circuit will work on shutdown phone call loads.
To reduce dimensions, the power supply of the circuit is transformerless. The capacitance of capacitor C2 is calculated depending on the relay used (its internal resistance). In this case, the executive relay is a 12-volt automotive relay, with an internal resistance of 80 Ohms. If you use another relay, then the value of C2 can be calculated in accordance with the methodology described in the article “Transformerless power supply”. Since the circuit is transformerless, for safety reasons, optocoupler D1 is used for galvanic isolation of the telephone circuits and the executive part of the circuit.
About the details: As optocoupler D1, you can use any one, I indicated the most common one, and sold in almost any radio stores - PC120. When connecting the device to the terminals going to the phone's vibration alert motor, the polarity must be observed. Transistor VT1 any silicon n-p-n type. Thyristor - also any small-sized one, both domestic and foreign, in the TO-220 case, for example, the VTA12-400 triac. The zener diode must be installed on a small aluminum radiator with an area of about 16 cm 2. Rectifier diodes VD4 - VD7 are any silicon for a reverse voltage of at least 400 volts. Capacitor C2 is paper, non-polar, for a voltage of at least 400 volts. For convenience, the device can be mounted in the housing of a network extension cord, making a special mount for a cell phone on it. One of the extension sockets can be used to connect a phone charger, and the other can be used to connect a load. Printed circuit board was not developed, the device was assembled on a mounting panel.
A prerequisite before non-standard use of a mobile phone: when registering a SIM card, disable all additional services cellular communication, context, receiving and sending SMS messages that are sent in huge numbers to our phones without our desire. In addition, it is necessary to turn off the dynamic heads that produce call sounds and the subscriber's voice. Considering that in your modifications you are going to use old phone, then if it is used in a non-standard manner, it is necessary to take care of its operation for a long time. After all, on old phones, as a rule, due to the large number of charge-discharge cycles, the battery is very weak, and there is usually no point in buying a new battery. When modifying the phone, it is necessary to provide for its external power supply. This can be done through a standard phone connector, or without a connector, by making small holes in the phone body and applying power directly to the terminals going to battery. The main thing is not to overdo it with the charging current. Otherwise, the battery may explode.
This circuit can also be used as a device that, when the alarm clock rings, which is in any (and in this case, in your old) cell phone, turns on or turns off another actuator. Imagine that you are in bed in the morning, and you just need to turn on the electric kettle at exactly six o’clock in the morning without getting out of bed. Instead of you, the above diagram will turn on the electric kettle with an alarm clock. To do this, in addition to the settings described above, you need to do the following: turn off vibration mode for incoming calls and SMS messages, turn on vibration mode for the alarm clock, set the alarm time.
And the main requirement for an electric kettle is that it must have a key control rather than a touch one, have a shut-off function when the water boils, and, of course, it must be in good working order.
I needed to remotely start a heating boiler, but otherwise you can start whatever your heart desires. What signal do we have everywhere and everywhere...? That's right, GSM. So, the cheapest GSM receiver is..? That's right, old sotik. Any beginning radio amateur can assemble the device. What were the priorities during development? of this device. Simplicity, low cost, minimum radio components.
Total we need
1) Cell phone, with vibration
7) Hands (It doesn’t matter where the hands come from, as long as they are golden!)
And so let's get started
We disassemble the cell phone, go where the motor is located and solder to its contacts
I had an old smart device at hand, I removed the motor completely, by the way, it is advisable to remember where the plus and minus are when connecting to an optocoupler, this matters.
You need to set up your phone so that vibration is triggered for an incoming call, but the vibration alert does not trigger for SMS, notifications, mail, MMS and any other junk, in order to eliminate false positives you need to set up a call filter (optional on each phone), you can order it from the operator, but this service comes with a subscription fee. Let's put together a diagram.
Everything works like this, we call, the phone receives a signal and sends voltage to (which is no longer there) the voltage goes to contacts 1 and 2. The optocoupler opens and passes the current of relay K1 through itself, the relay is triggered and self-powered through contacts K1.1, through the same contacts, a minus appears on the OUT pin. The circuit will remain in this state until the power is removed from it. How you choose to remove food is your choice. D1 is necessary to prevent the load current from passing through the optocoupler when the relay is turned on (the optocoupler has a current limit, and a load current of, say, 2A will quickly damage the device).
Since there are few parts, I assembled everything using a hinged installation, directly on
The other day an old friend contacted us. He lives in a private house and a couple of times unknown persons tried to visit him without an invitation. There is a need to install an alarm system. It turned out to be too expensive to put the house on the remote control. The optimal solution It seemed simple to notify the owner by calling his mobile phone when one of the motion sensors was triggered.
First, we visited local stores that sell burglar alarms. However, the prices for the most budget GSM devices have been high - from 5 kilo rubles per unit. Therefore, we decided to build a GSM alarm system with our own hands.
We had a Nokia 1600 mobile phone with the screen backlight turned off (a chronic problem with this model after swimming) and a 12-volt power supply. We had to purchase only the most inexpensive Astra volumetric detectors (200 rubles each), a 12-volt battery with a capacity of 7.2 Ah (another 400 rubles), several meters of four-core installation wire (~50 rubles) and a cyclic daily timer (250 rubles).
We have chosen the following alarm operating logic. When at least one of the volumetric volumes is activated, the call button (green tube on the device) begins to be “pressed”. On Nokia phones The first press brings up the last dialed number on the screen, the second makes a call to this number. Subsequent presses do not affect the operation of the phone.
To implement the intended algorithm, we collected simple circuit on domestic logic.
This is the simplest pulse generator. With the indicated ratings of R1 and C1, the pulse frequency is approximately 1 Hz. The generator load is an optocoupler. We pulled him out computer unit nutrition. Right part The optocoupler is connected to the contacts of the call button of the mobile phone. To do this, the phone is opened, the button contactor is removed, and thin wires are soldered to the contacts.
A tact button is included parallel to the wires. It is needed to configure the system.
The volumes we have selected in in good condition(no alarm) have at the output relays with normally closed contacts that break the circuit when the device is triggered. We used this to control the click generator.
The volumetric output is switched on parallel to the optocoupler and, in security mode, simply short-circuits the generator output to ground. The current limiting resistor becomes the only load on the generator. When the circuit is opened, the current flows through the optocoupler and the system begins to work.
Now about setting up your mobile phone. Automatic keyboard lock must be turned off. Clear the log of all calls, set up forwarding of all voice calls to the MCA number - Missing Call Alerting ("You have been called" service). This is important, otherwise it is possible that the system will answer a random incoming call instead of calling the owner’s phone. Then you need to dial the owner’s number and press the remote call button. If everything is assembled correctly, the owner's phone will ring.
Our volumetric units support only one operating logic: after triggering, the alarm loop opens for one minute. During the same time, the phone will try to reach the owner. It is impossible to get rid of him.
The relay outputs of several volumetric tanks should be included in the alarm loop in series. Then, when any of them is triggered, there will be an alarm in the circuit. The number of volumetric volumes connected in this way is limited only by the resistance of the wire.
The generator and volumetric units receive energy from a 12-volt power supply. The phone runs on its own battery, only once a day the timer turns on (for an hour and a half, selected experimentally), which, through the standard Charger recharges the phone.
Arming and disarming of the device is carried out by a disguised switch inside the controlled room. Thus, the “arrangement through alarm” mode is performed. This is convenient; the functionality of the system is checked every time before turning it on.
An extended version of this alarm system has a battery backup. In our case, the 12-volt battery is connected in parallel with the main power supply. The power supply is turned on via a diode. It prevents the battery from being discharged through the power supply when it is de-energized.
Thus, if you have an old phone and direct hands, you can get a suitable GSM detector that costs less than a thousand rubles. Our system works for a friend without any complaints and does not give false alarms. For convenience, he even set a separate ringtone in the form of a siren for an incoming call from the system.
5 / 5 ( 2 votes)
A necessary component of a “smart” home that helps control household and climate control equipment. A GSM socket can be purchased or made with my own hands. The operating principle of the device is implemented through support of the digital standard GSM communications. The socket can also act as an alarm. Independent production of such devices in Lately often practiced due to the abundance of low-quality Chinese sockets on the market. To decide whether you need smart plug, pay attention to its properties:
- the ability to remotely control (turn on, turn off) any electrical equipment using commands from your phone;
- control over the indoor climate and maintain temperature conditions;
- possibility of use as a component of an alarm system;
- emergency power outage in the house.
GSM socket equipment
It is important to understand that even a self-made “smart” outlet will “draw” a lot of electricity due to the presence of a power supply that smoothes out voltage drops - without it, the switch will quickly fail. In addition, the price of components may become an obstacle to assembly.
The GSM socket looks like an ordinary adapter that connects to a regular socket. The operation of devices included there can be regulated via a call or SMS to a SIM card inserted into the socket slot. As a backup option, a self-assembled socket should provide a manual control option (usually these are buttons located on the side of the case). It is worth expecting that a device assembled by yourself will have a power of up to 5 kW. This will allow it to be used for many types of equipment. By assembling the socket yourself, you will have the opportunity to save 1000 rubles or more, depending on the cost of the finished socket on the market.
Methods of using SMS socket
The principle of operation of the socket is implemented on the basis of decoding tones - in modern phones Tone dialing is used. These signals are abbreviated as DTMF. To decipher the signal frequency, you will need to install a decoder.
In addition, some experts recommend saving power consumption from an outlet using an energy saver, which reduces the load on the network and its current consumption. This saves from 30 to 50% of money on electricity bills.
What does the specialist think?..
The operating principle of the GSM device is based on remote control of the socket; a signal can be supplied to it via a radio channel, Wi-Fi, mobile network, as a result of which the circuit will open or close, thereby turning the device on or off. Some models of smart sockets can support 2 or more numbers and be equipped with sensors for monitoring the state of the room.
Konstantin Kotovsky
Design
A DIY GSM socket involves purchasing a relay, as well as making a simple control unit that deciphers the tone. The function of the relay will consist of switching contacts on and off. And the decoder will signal the execution of the command, as the diagram shows.
Accordingly, in order to manufacture the device, you need to purchase a polarized relay. It has a couple of coils. If one of them is connected to the network, the armature is attracted to one of the relay cores. This will prevent the contact from opening even in the absence of voltage. To fix the contact in its original position, voltage must be applied to the 2nd coil. The pulse supplied there must have a certain amplitude and duration.
To power the outlet, you need to solder a diode-type rectifier. It contains a capacitor designed for voltages up to 24 V. Although this is a violation of safety regulations, when connecting an outlet with a power of up to 3 kW it will not affect the operation of the devices in any way and will not lead to problems in the network.
Principle of operation
The receiving module will be regular phone(even suitable for this old mobile phone with vibration alert function) or a receiver equipped with a decoder. The operating principle of the device is as follows:
- connect the relay. When you connect it, check the polarity of the voltage that is at the output of the mobile. The presence of vibration in it greatly simplifies the operation of the circuit;
- when the vibration alert is triggered, the optocoupler relay opens the open transistor as well as the transistor. It charges the capacitor from the device through one of the relay windings;
- the armature will switch, turning on one of the pair of relay coils making the contact. The contact is responsible for turning the socket off or on;
- after the end of vibration (discharging the capacitor), the relay armature is moved to its original position;
- if vibration is applied again, the armature switches to the 2nd coil and the circuit is disconnected.
Operating principle of SMS socket
It is important that you do not need to configure your phone every time. It will be enough to make a call to him. However, you need to know that the relay will be triggered in the event of, for example, spam being sent to a mobile phone.
One of the elements of a “smart home” is a “smart socket”. It is much easier to buy a GSM socket, but it is quite possible to make it yourself. She supports digital standard mobile communications GSM and can be used to turn on and off alarms in a house or apartment. Since on this moment Such devices are widely represented on the market (lately there have been quite a lot of cheap Chinese handicrafts), so purchasing it at an adequate price is not a problem. But some people prefer to make such sockets themselves.
Short description
A “smart socket” can be used to implement the following functions:
- Remote control of household appliances: kettle, stove, boiler, etc.
- In business premises, you can remotely connect computer equipment.
- The GSM socket allows you to turn on and off the automatic watering system in your garden plots.
- When connecting air conditioners and heating devices to such a device, it is possible to adjust the microclimate of the room.
- This socket is well suited for security alarm systems.
- If necessary, you can urgently turn off the power supply to the room.
It is important to note the disadvantages that the SMS socket has. These include:
- the need for a power supply that will smooth out voltage drops in the network (they can damage the GSM switch),
- Quite a lot of power consumption for one device (the communication module draws a lot of power),
- complexity of production and high cost of components.
In this case, the socket with remote control can be automatically turned on or off from sufficiently large distances using mobile communications (for example, a call or SMS message).
The GSM socket itself with a temperature sensor looks like a regular adapter that plugs into a regular socket. Household appliances connected to it turn on after a call or SMS notification; in addition, a smart socket almost always has manual control (as a backup). However, such sockets are designed for a load of up to 5 kW, which limits their use. The cost of factory products currently reaches 3 thousand rubles (minimum cost 900 rubles), while the cost of components for self-made about 2-2.5 thousand.
A little physics: description of the process
Our readers recommend! To save on electricity bills, our readers recommend the ‘Electricity Saving Box’. Monthly payments will be 30-50% less than they were before using the saver. It removes the reactive component from the network, resulting in a reduction in load and, as a consequence, current consumption. Electrical appliances consume less electricity and costs are reduced.
Currently modern telephone sets use tone dialing. Such signals are called DTMF signals. Their sound depends on the combination of frequencies, and the frequencies are selected in such a way that harmonics are not formed. Therefore, to decipher the frequency, you need to install a decoder (you need to purchase it to make the switch yourself). Accordingly, if, after connecting, you start pressing the number buttons on the phone, the person being called will hear their tones.
A similar socket is created based on the principle of tone decoding. Pressing keys controls turning on and off such devices.
The simplest design
Here are instructions on how to make a tone decoding device that can control a primitive relay. It is the relay that will turn the contacts on and off, and the signals to it will come from the decoder.
A primitive controlled socket requires, at a minimum, the purchase of a polarized relay.
Now let's move on to the description of the scheme. The main device is the mentioned polarized relay. It has 2 coils connected in such a way that when one of them is connected to the network, the armature is attracted to one of the relay cores and does not open the contact even after the power supply is stopped. For the contact to go to initial position, an impulse (voltage supply) to the second coil is required. In this case, the pulse must be of a given amplitude and duration.
To power such a device from the network, it is necessary to solder a diode rectifier. Usually it contains a capacitor designed for a voltage of 24 V. Such a circuit seriously violates safety regulations, but its careful use for loads of no more than 3 kW will not lead to serious accidents.
As a receiving module, you should have either an old mobile phone or a special receiver with a decoder. It’s easier to buy a primitive mobile phone with a vibration alert function. An optocoupler relay is connected to the vibration alert; when connecting, you should check the polarity of the voltage at the vibration alert outputs; this is important, since the relay has “+” and “-” output contacts. Vibration alert significantly simplifies the operation of the circuit.
When the vibration mode is triggered, a transistor opens in the optocoupler relay, which charges the capacitor from the socket through one of the relay windings, and an open transistor (all this happens in the relay circuit). Next, the armature switches and turns on one of the coils of the polarized relay, which closes one of the contacts (to turn on the mains voltage or turn it off).
The polarizing relay is a starter. Next, after the capacitor is discharged (when the vibration stops), the capacitor is discharged, which moves the armature of the optocoupler relay to its original position. When vibration is repeated and the optocoupler relay is activated again, the armature of the polarized relay will switch to another coil and the circuit will be disconnected. In this case, there is no need to set up your mobile phone again, just calling the number is enough.
The disadvantage of this scheme is that the relay will be triggered when SMS spam is sent.
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