Any bicycle anti-theft alarm is unlikely to stop the kidnapper, but it can strain his nerves and maybe even scare him away. The presence of a protective circuit does not eliminate the need to securely fasten the bike with a steel chain or a quality lock, and not with a taut Chinese cable.

This alarm for a bicycle will work if you change its position, or if you touch it. The alarm signal lasts 30 seconds, and after a few seconds, it repeats and so on until the bike alarm is turned off.

The bicycle alarm consists of three main components: a vibration sensor, a siren activation delay timer, and an alarm sound generator.

The vibration sensor is a rather long and flexible spring, one end of which is soldered to a piece of double-sided fiberglass. Then carefully solder this piece perpendicular to the printed circuit board from the back. We pass the second end of the spring through a tinned washer, which also needs to be soldered to the printed circuit board. That is, at the moment of a slight push, the spring closes on the washer, and then opens, which will create a drop on the inverters DD1.1 and DD1.2.

The generated pulse will start a single shot on the logic elements DD2.3 and DD2.4, which implements a 30 second delay. This delay can be changed by changing the resistance R7 and the capacitance of the capacitor C6.

Elements R4 and C3 set a time delay after turning on the device to calm the vibration sensor.

The source of the alarm signal is a piezo emitter. Rectangular pulses to the piezo head come from the Schmitt trigger made on the element DD1.4. Its frequency is set by the capacitance C7 and the resistances R8, R9. To achieve the maximum sound signal, this oscillator frequency coincides with the resonant frequency of the piezo head. To make the sound signal more noticeable, it is replaced by a low frequency signal created by the second multivibrator.

Try not to leave your iron horse unattended.

Almost any number of normally open switches can be used in a bicycle alarm circuit. Set them so that they close when the handlebar changes position or the bike frame moves out of place. Use microswitches to protect removable components and other easily removable parts. If at least one microswitch is closed, the siren will yell. Two minutes after the switch contacts become open, the alarm will stop. The sounding time of the siren is selected by the value of the capacitance of the capacitor C1.

The circuit board and switches must be protected from moisture or condensation, which may cause false operation of the circuit. Without its sensors, the board is quite compact.

When the bicycle alarm siren, the circuit consumes almost no electric current. Thus, the presented scheme allows you to independently assemble a fairly simple and reliable alarm system for a motorcycle, which has a certain versatility. I powered the circuit from a 12 volt power bank. The main disadvantage of this bike alarm scheme is that if the robber knows about it, he only needs to disconnect the battery.

A good protection option can be purchased in Chinese online stores for only 300 rubles. The size of this device is a pack of cigarettes, and it yells so loudly that it immediately lays its ears.

The device is controlled via a radio channel, with a frequency of 433 MHz, from a remote control with two buttons. The range of the control panel is 30-50 meters. The receiver is a conventional super-regenerator. Then the signal is decoded and controls the operation of the siren on the piezo emitter.

The piezo emitter is used in the bicycle alarm circuit and as a shock sensor. Even the weakest pulse from it, getting to the operational amplifier, is amplified and fed through a step-up transformer to the siren. The circuit is powered by a single 9 volt battery.

If you still have your bike stolen, then you have a small, but still chance to find it, for this I propose to assemble a small radio transmitter that can be tracked using a conventional FM radio receiver. The tracker can be powered by a 1.5-volt battery and has a range of about 0.5 km. This radio tracker must be placed hidden on a bicycle and in case of its theft, just ride around and search with a conventional radio. Since stolen bikes tend to settle in some place, an example in a forest area not far from the city.

The current consumed by this device is only 3.7 mA, so the AA batteries last for a week of continuous operation. It is better to exclude the LED from the circuit so that it does not attract the attention of a thief, although it can be left at the debugging stage. Because when you see his quick flashes. You need to tune the FM radio and find the clicks of the transmitter. The antenna can be a piece of flexible wire 25 cm long, imperceptibly wound around brake cables or hydraulic lines.

To increase safety when riding a bicycle, it is recommended to equip it with an audible alarm. The structure of the electronic call circuit includes an AF generator, a power amplifier and a dynamic head. Using an electronic bell is much more convenient and better than a classic mechanical one.

For a long time, many vehicle owners have realized that an alarm is an excellent anti-theft tool. It is also installed on the bike. High-quality technologies provide protection from an intruder, not only preventing the theft of property, but also attracting the attention of others.

Types

There are several categories of electronic systems. One of them is a siren. She is able to attract maximum attention from passing people. A beep at high volume will scare away the thief. If an intruder tries to remove or disable it, the sound will only increase.

An equally popular method of protection is a special system with a control panel. It works like the previous one. The difference lies in the fact that you can turn off or turn on the sound signal at a distance only using the remote control.

A smart bike alarm is one that has a code blocker. How does this system work? It fixes the lock until the owner enters the correct combination of characters.

Bicycle alarm with feedback is no less popular. It will not only scare away the intruder with a loud long alarm, but will also send information about this to a special reception panel.

Those people who have purchased an expensive vehicle and are afraid for its safety should install several alarms at once. Then the attacker will prefer to bypass the bike, otherwise it will take a long time to mess around, and not the fact that it is successful.

What opportunities does a bicycle alarm with a remote control open?

How does this type of protection scare off an intruder? During extra fuss next to him, the bike starts to make a loud noise, the threshold of which is 120 dB. It should be noted that this sound signal for the ears is considered painful.

Thanks to special settings, you can slow down the alarm. This is done so that the bike does not start to "scream" with the vibration that appears due to a passing car. Accordingly, the owner will not often have to come to the parking place in the event of a false alarm. This alarm not only works with a loud sound. It is also capable of sending alerts to the control panel. If a person always uses it and keeps it close, he will quickly be able to understand when his vehicle needs protection.

Bicycle GPS device

An excellent alarm for a bicycle with a key fob is one that is able to determine the location. She hides in the steering column. Has the shape of a flask. Significantly saves battery charge, as it works only while driving. When a bike is stolen, it can be easily found via satellite, and because of high level secrecy, the offender will not guess anything.

smart lock

On the this moment smartphones are quite popular. There is also no need to talk about the wide demand for GPS navigation services - everyone knows about it. When combining two technical means- phone and module - you can easily monitor your vehicle. Previously, such systems worked only for cars, but now they are also used by cyclists.

The Lock 8 lock is a perfect example of this. It hit the market in the spring of 2014. High quality lock. By the way, this model is constantly being improved.

What are the advantages of this system? So, you can easily control the alarm blocking through the software on your phone. This is the most convenient. The data is not transmitted via the Internet, but via the Bluetooth module. This is an additional advantage, but the distance between the bike and the phone should be small. The last remark, of course, is a significant minus, although for many it is not particularly critical. The key can be transferred to the smartphone of any person if you need to transfer the vehicle to someone else. In case of theft, this lock will be able to determine its location - it has a built-in navigation system and a communication module. The blocker does not have batteries.

Disadvantages of anti-theft alarm

A bicycle alarm lock has its drawbacks. What? First you need to notice that a lot of energy is consumed in standby mode. Why? Because the sensors are constantly in working condition and consume all the "fuel" they need. Therefore, bike owners who actively use the vehicle will have to constantly spend money on batteries. If the alarm has a battery saving mode, then its noise signal will sound for no more than 30 seconds. It should be noted that the reviews of the owners about this moment are extremely negative. Often she falls silent at the most inopportune moment.

Also, the environment significantly affects the operation of the system. It is primarily about humidity and air temperature.

How to make a bike alarm with your own hands?

You do not need to have outstanding knowledge and achievements in the field of radio engineering to create such a device for your vehicle on one's own. You just need to have basic skills and understanding of the structure of the system. What should be used? A regular wireless doorbell will do. It should function in open mode, for this you will have to tinker a little with the correct arrangement of wires.

A similar system can be installed in the end surface of the steering wheel. If you want to improve the received version, you should replace the standard ringtone with a more powerful one. This alarm will work if the steering wheel rests on a hard surface. As soon as the bike is moved, an audible alert will immediately sound.

Of course, you need to understand that such a system is imperfect and needs to be improved. It is best to prefer factory options that were created by professionals. Their main difference is powerful and loud sound effects.

Finally

If you want to buy for yourself the best model of an alarm device that will delight you with its combination of price and quality, you need to consider expensive options. They guarantee high-quality protection against theft.

How much will the device cost? The minimum cost is 300 rubles. If the owner is really worried about his vehicle, then you will have to pay more than 1 thousand. Then you don’t have to worry about the safety of your device.

If we talk about the capabilities of systems, then you need to choose the most practical options, based on your own interests. The main advantage is the control panel, which comes with some models. Thanks to such programming, it is possible at any time to draw attention to the situation with the theft of someone else's property. In addition, using the remote control, you can adjust the sound range. Sometimes its high frequencies can cause discomfort and harm to the health of not only the attacker, but also people who are nearby.

Types

Electronic anti-theft protection systems for two-wheeled vehicles are conventionally divided into several categories:

1. Sirens - scare away intruders with loud When you try to dismantle the "squeak" of the alarm increases, which is extremely unpleasant for the hearing of the thief and passers-by.
2. Sirens with remote control - function in the same way as the previous solution. The only difference is the ability to disable and activate at a distance.
3. Bicycle alarm with combination lock - fixes the lock until the owner of the bike enters the correct combination of characters.

What opportunities does a bicycle alarm with a remote control open?

Bicycle anti-theft agent:

1. It emits a noise signal, the power of which is on the verge of a pain threshold and is about 120 dB.
2. Special settings allow you to delay the response time by a certain time, which becomes useful, for example, if the system receives vibrations from passing public transport. This functionality does not force the bike owner to respond to a false signal every time.
3. The bike alarm not only makes a loud sound, but also sends alarm alerts to the remote control, which is always at hand for the owner of the bike.

Disadvantages of anti-theft alarm

Like any other electronic device, a bike alarm has several disadvantages. First of all, it is worth noting the high power consumption in standby mode. The reason for this is the need to power special position and motion sensors. Therefore, the owners of such systems often have to burden themselves with replacing batteries.

Devices that have a power saving function sound for 15-30 seconds. Quite often the system falls silent at the most inopportune moment.

Bicycle alarms are quite vulnerable to the effects of aggressive environmental factors, in particular high humidity, temperature indicators.

How to make a bike alarm with your own hands?

To make a means to prevent the theft of a two-wheeled vehicle, it is not at all necessary to be well versed in the basics of radio engineering. To do this, it is enough to find a high-quality one by rearranging the electrical contacts in such a way that the device functions to “open”.

A homemade alarm can be placed in the end of the steering grip. The system will be improved by replacing the standard sound signal with a more powerful howler. To activate such an alarm, it is enough to rest the steering wheel on a hard surface. At the first attempt to move the bike, an audible alert will sound, which will make the attacker experience not the most pleasant moments.

Naturally, a self-made alarm is not as perfect as factory samples. Therefore, it is better to trust professional developments, combining protection in the form of a sound device with a powerful lock and chain.

Finally

If speak about the best way to protect the bike from theft, it is worth considering the available options according to the degree of reliability, functionality and potential hacking speed.

How much does a bike alarm cost? The price of the simplest devices of the budget category starts from 300 rubles. However, bike owners who are really worried about the safety of their own property should pay attention to systems worth 1000 rubles or more.

As for the possibilities, this implies the degree of functionality of the alarm, the presence of truly practical qualities. So, the main advantage of systems with a remote control is the ability to communicate with the bike at a distance. Programming the device to react to certain stimuli makes it possible not only to draw everyone's attention to the hijacking attempt, but also to cause physical discomfort to the hijacker. After all, the volume and frequency of sound waves in high-quality signaling devices often reaches values ​​that are dangerous for the safety of hearing.

The bike does not stand still, two wheels famously roll it in step with the times. Models are being improved, the assortment is replenished for every color and taste, devices and devices appear to improve the quality of “bicycle life”. These include an alarm that is ready to protect the bike from the evil intentions of the ubiquitous hijackers.

An alarm system with a feedback function is not just a “shout”, but a functional communication device for the owner with the bike left in the parking lot. It has a complete analogy with the car anti-theft system - the owner will be notified in time about the theft or its attempt. What is good about this device, what disadvantages it has, and we will learn about the enhanced protection of the bike later in the article.

Functions of the anti-theft system

The alarm kit with feedback includes an electronic unit, key fob, mounts and batteries. Actually, nothing complicated, the device is very simple, the settings are transparent, but instructions for adjustment and operation are included to help.

The principle of operation of the signaling system is to give a loud signal and report the theft to the owner through a key fob or remote control. Turning the alarm on and off is carried out by special buttons on the key fob.

True, at first the owner himself may forget about the need to turn off the device and be deafened by the piercing scream of the signaling. Some models have integration with a smartphone: a special application is installed through which the owner via Bluetooth will be notified in time about attempts to steal, as well as the location of the bike via GPS.

Standard bike alarm options include:

• loud attracting signal up to 120 dB;
• sensitivity settings for distance and time;
• call via application or remote control;
• additional power supply (for long stops);
• notification of low batteries and disabling the alarm.

The system is usually attached to the seat tube, less often to other parts of the frame.

Remote signaling: yes or no?

It should be noted right away that the alarm system is not a cheap thing, therefore it is rational to put it on the corresponding bicycle models. Advantages of the anti-theft system:

• loud signaling: on city streets, this will immediately attract the attention of passers-by and the owner himself;
• remote warning system, you can leave the bike in the parking lot without a lock;
• the device, although expensive, can be bought without problems - on the counter or by ordering on the Internet;
• sensitivity setting.

Minuses:

• the sensitivity of the alarm is also a disadvantage - the device can work with small vibrations, causing great inconvenience to the owner;
• on budget models, weak mounts;
• the application on the smartphone may suddenly freeze, due to which the owner may not receive an alarm signal;
• high battery power consumption in passive mode.

Whether to buy a bike alarm or not is up to everyone to decide. Here it is worth considering the price of the device, the class of the bike, the frequency and duration of parking, the place of the most frequent stop.

Anti-theft alarm with lock

Combined version - a bicycle alarm with a lock. In the off state, the device works like a simple anti-theft device with keys. An active alarm system sends out alarms and alerts via bluetooth.

Alarm cable lock

The advantage of the signaling lock:

• the bike is fastened;
• signaling always, even when the thief tries to bite the cable;
• the device is less conspicuous.

Of course, no matter how modern and reliable methods are, there is no 100% guarantee of protection - thieves have not decreased, if not vice versa. Therefore, it is worth giving some more valuable tips on how to protect your bike as much as possible in the parking lot.

Extra protection doesn't hurt

Since stopping a bike on the street is a risky business even with advanced signaling, it is not recommended to leave the bike unattended for a long time. Although the alarm is silent, it is necessary to periodically check whether your two-wheeled friend is in place.

A wireless alarm system plus a cable or U-lock lock is a more reliable option when compared to installing only an alarm. classic rule“fastening both the frame and the wheels” are not canceled: when fixing only the wheel, there is a risk of losing the most important thing in the bike - the frame and fork.

Another good recommendation for protecting a high-speed bike from theft is to set a low gear. A thief, carried away by the theft process, will not be able to immediately go far from the parking lot, and the alarm will attract more attention at low speed.

Conclusion

Bicycle alarms are a great addition to protecting your bike in the parking lot. Nevertheless, vigilance should be exercised: the device can fail, and the hijacker can remove it from the bike. It is preferable to set the maximum protection and choose proven parking spots.

Bicycle alarm appeared a second time. If not for the large number of hijackers, it would not be needed. Until now, in the villages, cases of bicycle thefts are the work of “guest performers”.

The problem of stealing any vehicle is very acute in our country, where you can sell stolen goods from your hands in Kaliningrad, and find a car, for example, in Vladivostok.

With bicycles, it’s quite simple: you don’t need to interrupt the numbers, repainted the frame and that’s it. As a last resort, I threw out the “baubles” of the previous owner, which made the bike too recognizable.

Here, for example, is a Novosibirsk car of one good man. Not only is it equipped with a two-stroke Comet engine, but the whole machine also bears the imprint of design in a mixture of rockabilly and steampunk. A thief needs to strip everything, depersonalize it, and then sell it. Therefore, such machines are looked at in advance.

There is a heartbreaking site for finding stolen bikes: lostbike.ru

Since every fifth, if not tenth, bike gets on its pages, the statistics are more than depressing. Here are typical situations: “The bike is practically new. They took me away from the stairwell, biting the cable. “Two guys cut the cable and drove off towards the outskirts.” “Stolen along with the chain. A piece of chain was left at the porch at work. The police did nothing. It has been poisoning the soul for the third month already ”…

The situation is aggravated by the imperfection of the legislation. Even car thieves during the investigation declare that there was no thought of stealing, that is, forcibly appropriating someone else's property. Like, they would ride and put in place. And to prove that it was the theft that was planned is almost impossible. It’s even easier with bicycles: I would bite the chain, ride it and put it in place. Only when theft is legally equated with theft, then the bike thieves will think about whether or not to take someone else's.

Simple rules that make life difficult for a hijacker

• The simplest and most effective rule is not to leave the bike unattended;
• In the event that there is code lock, chain and padlock and so on, you can take your eyes off the bike, about 40-60 seconds. Then it is advisable to leave the queue at the pharmacy and take a look at the porch and the bike.
• It should be before you drive up and, dismounting, leave the bike, put the shifters on the largest driven and smallest leading sprocket. In this case, the attacker will be forced to drive very slowly until he figure out how to switch. And these are seconds, the opportunity to attract attention, the threat of a fall. Anything is better than the quiet disappearance of a thief with a bike.
• Remove everything “beautiful and expensive” from the bike - a rare copper horn, audio speakers, a beautiful rear-view mirror. Come back - you won't find it.
• Never fasten the bike by the wheel. Remember that the frame and front fork are the most expensive parts, just like the car body.
• Experienced Tip - Repaint your bike in a poisonous fluorescent color or a zebra in the most teary shades. Most likely, they will not be associated with this.

What can a bike alarm do?

• The bicycle alarm can give an audible signal when the vibration sensor is triggered at the level of the pain threshold, up to 120 dB.
• The setting allows you to ignore vibration that lasts shorter than a certain time, for example 2 seconds. This time is enough not to disturb the owner during the passage of the tram next to the parking lot.
• The bicycle alarm with feedback not only “beeps” very loudly itself, but also sends an alarm signal to the remote control.

Therefore, if you see an alarm with feedback on sale, then this means that you will have, like a car owner, a device with a remote control or a key fob.

The alarm system and the bicycle anti-theft lock have been combined. So there were locks with alarms.

The advantage of this device is that a loud and unpleasant sound signal is given not only when an intruder opens the lock, but also when trying to get by with “little blood”, i.e. when the cable is bitten or at the slightest vibration. This greatly increases the owner's chances of responding.

The device runs on 3 batteries. In addition, if desired, the alarm can be turned off and the device can be used as simple lock.

The second option with an alarm is a rigid frame type made of hardened steel. At a price of about 2.5 - 3 thousand rubles, hardened steel perfectly resists both the hacksaw blade and double-lever bolt cutters.

What can smart bike lock do

In connection with the development of cellular telephone communications and GPS navigation, it would be surprising if sooner or later these innovations did not begin to help not only motorists, but also bicycle owners.

One such example of the use of communication in bicycle alarms is the “intelligent” lock 8, which entered the market about a year ago, in May 2014.

Its distinctive properties are:

• Electronic locking is controlled through a special application on a smartphone.
• Data exchange is carried out via a wireless Bluetooth connection.
• It is possible to send a copy of the electronic key to those people who are trusted by the owner of the bike.
• The lock is equipped with a mobile communication module and a GPS receiver in case of theft.
• It is important that the blocker does not have batteries, but is recharged while driving. This means the energy independence of the device.

Read more about this wonderful castle here:

By the way, this castle also has a “miracle price”: about 8,500 rubles without delivery in Russia.

The second pure GPS tracking device option is the Spy Bike GPS Tracker.

This alarm does its job quietly and imperceptibly. It hides in the steering sleeve and is activated via SMS. The vibration sensor sends an SMS about the theft to the owner's phone. The job of this hub is to send coordinates from the processor, which can be fed to the owner's cell phone in the form of local coordinates with a certain time interval, which can be represented as a trajectory.

Naturally, this requires a SIM card. The device runs on batteries for several months. In the SMS coming from the device, the battery level is shown.

A wonderful thriller with a happy ending about the use of this device is shown below.

What are the "cons" of an anti-theft alarm?

High current consumed by devices in "standby mode", which is explained by the power supply of motion sensors, position gyro sensor and other devices. Typically, this current is 0.7 milliamps per hour. Considering the battery capacity of 0.5 A \ hour, it can be understood that the average life is about 1 month.

And so the following situation is possible: forgetting to change the power source in a month, you are horrified to see that there is no bicycle, and the device “did not work”. The need for frequent battery replacement imposes certain restrictions on the convenience of using an alarm with an autonomous power source.

In addition, the alarm itself sounds for 15 seconds to save energy. Sometimes she falls silent at the most inopportune moment, for example, when she “shouts out” in deserted garages and the thief drives out in silence to a crowded place. While the next 15 seconds pass, a lot can happen.

In order to make a bicycle alarm with your own hands, it is not at all necessary to have knowledge in radio engineering.

To do this, it is enough to purchase a wireless bell for the front door and rearrange the contact a little so that it works for “opening”.

After that, you can mount it in the end of the steering grip and, having changed the bell to "howler", use it calmly. To do this, you need to press the button and, in the pressed state, rest the steering wheel against a tree, for example. Now, when you try to move the steering wheel away from the support, you will hear a beep.

Of course, do-it-yourself alarms are more vulnerable than industrial ones. What if it doesn't work, or the water gets wet. Trust professionals!

Of course, it is best to combine GPS control, lock with audible alarm and strong chain.

And finally, you can watch a good passage from Galileo about bicycle locks.