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Automotive digital voltmeter places for installation. Voltmeters for cars. Video “Installing a digital voltmeter with your own hands”

In this article we will talk about voltmeters for cars presented on Aliexpress and how to install them correctly.

The automotive industry is trying to find applications for all technological devices that make human life convenient and interesting. Even for the most inexpensive cars, there are touchscreen multimedia centers that bring novelty to the pilot’s workplace. Although due to extensive modernization, some control devices are lost.

Today, many automakers no longer install separate voltage measuring devices in cars. They are built into on-board computers, but still they do not lose their relevance and are in great demand. You can purchase such devices at Aliexpress .

Voltmeters for cars on Aliexpress: catalog, photo

Many motorists want to have separate voltmeters for several reasons:

  • With this device you can constantly monitor the voltage
  • Using analysis, you can determine what load is on the generator, which is especially important in winter
  • You can find out if the network is healthy

The car's on-board computer does not know how to show the current voltage level, and therefore it can give a signal when the battery is completely low. When installing a voltmeter, the driver constantly monitors the voltage and ensures a constant charge of the battery. This can be done if you turn off all unnecessary power consumers, such as a radio, heated seats, and so on.

A large assortment there are voltmeters two types, depending on the display:

The first type allows you to get the most accurate indicators. For the most part, the measurement error is no more than 0.1 V. Although analog devices will look good in any car. If you decide to buy the latter, then check whether the model has a DC circuit marking. It is shown as a straight line at the very bottom of the dial.

The device can be installed in different places in the cabin. Thus, depending on the type of installation, there are three types of devices:

It is worth noting that analog devices are installed in the cigarette lighter socket.

You can buy a “sophisticated” electronic voltmeter that has a microcircuit that can display the following parameters:

  • Temperature outside and inside
  • Engine speed
  • Current time

The bulk of devices are produced in China. There are also domestic models, for example, Shturman. Electronic options cost around $10, but analogue ones in a tuning version can cost $20.

Owners of cars, especially domestic ones, should consider purchasing a voltmeter, since standard systems usually do not signal in advance that the battery is low. The device monitors the load on the generator in real time and provides battery protection.

How to install a voltmeter from Aliexpress to a car?

  • First, check the wiring kit to ensure all components were in order

  • It is better to make the connection while wearing safety glasses.

  • Disconnect the negative cable from the battery

  • Install the unit into the 2 1/16 inch (5.24 cm) holes in the dashboard

  • Secure it with the supplied brackets and nuts
  • Connect the black wire from the voltmeter to the engine ground

  • Connect the red wire to the 12V ignition terminal or any other switch with the same voltage

  • Connect the white wire to the lighting panel

  • Connect the negative cable back to the battery

Voltmeter for a car on Aliexpress: sales, discounts, promotions

Discounts on Aliexpress

Everyone knows that on Aliexpress the lowest prices for goods, but at the same time There is an opportunity to buy more. For example, many products are given an additional discount only for purchasing from a phone. There is also a remarkable section where good products are given away every day. If you're lucky, the purchase will cost only 1 cent. In addition, there is a section where every day you can collect coins and grow coins, for which discounts on goods are also provided.

All this is not available on the computer version of the site, but there are many sales here. They are regular and large. The first ones are held every day and include, "Day discounts in the Mall" And

Voltmeter for a car on Aliexpress: reviews

Victor: The device is high quality. I bought the USB model, because I don’t like to mess with all sorts of wires. It works clearly, I double-checked the readings with a multimeter, everything matches. So I'm happy.

Leonid: The voltmeter is made with high quality. I installed it myself for the first time, in principle, there is nothing complicated. All readings are displayed on the display, everything is correct. I will order more for a friend!

Ilya: I bought a model for the cigarette lighter. For some reason, the screen flickered at first, but this was most likely a problem with the cigarette lighter. The device itself is high quality and accurate.

Video: Voltmeter in a car with Aliexpress

The automotive industry finds application for all innovative devices that make the ordinary person’s time at home comfortable and interesting.

Even budget cars already have touchscreen multimedia systems that add variety to the pilot’s workplace. However, global modernization leads to the fact that the new generation vehicle loses some of the control devices.

Why do you need an on-board voltmeter?

Many automakers have long deprived their products of a device that allows you to measure network voltage. Instead, on-board computers were installed that can diagnose each assembly unit. AVTOVAZ also followed this path.

However, quite a few drivers want to buy a car voltmeter, explaining this by the following circumstances:

  • the device allows you to monitor the voltage value online;
  • analysis of digital values ​​helps determine the load on the generator, which is especially important in winter;
  • provides the ability to determine the health of the network.

The dashboard of a modern car does not allow monitoring the operating conditions of the DC generation system. The system is only capable of signaling an extreme state of affairs when the battery is already dead. By installing a voltmeter, the driver gains an undeniable advantage - the ability to control the operation of the voltage regulator relay, ensuring a reliable battery charge. It is possible to implement such a scenario by disabling:

  • heated mirrors and rear window;
  • radio;
  • climate control system;
  • interior lighting;
  • heated seats.

How to buy a suitable voltmeter for a car: classification

The wide range of products can be easily divided into two groups based on display type:

  • electronic;
  • analog.

Digital values ​​will allow you to get the most accurate readings. The error of the transmitted value, as a rule, does not exceed 0.1 V. The pointer device will fit more harmoniously into the interior of any car. When choosing the latter, you need to pay attention to the presence of DC circuit markings (straight line at the bottom of the dial).

The device can be mounted in any part of the cabin. Based on the type of installation, there are three types of devices:

  • into the cigarette lighter;
  • built-in;
  • mounted on the instrument panel.

It is worth noting that the analog device is not mounted into the cigarette lighter socket. The owner of cars of the tenth family with an old panel is recommended to install a built-in indicator instead of the standard clock.

You can buy a “tuned” electronic car voltmeter, the microcircuit of which is programmed to display secondary indicators:

  • air temperature in the cabin and outside;
  • crankshaft rotation speed;
  • current time.

What to look for when choosing

When choosing a suitable product, you should clearly know what voltage value the vehicle’s on-board system operates on: 12 V or 24 V. This affects the measurement range, which is narrow for these devices. So, for a passenger car the gap should be at least 10 - 16 V, for a truck: 22 - 28 V.

At the moment, electronic indicators with different numbers of zones are being implemented. You should choose four-zone ones, as they show the most accurate information (4 digits, instead of the traditional three).

It is also worth paying attention before buy a modern car voltmeter, on the range of stable operation of the device. As a rule, any type of voltmeter operates at temperatures from – 30 to + 60 degrees Celsius.

If there are secondary functions, you should ask what boundaries of digital values ​​they are capable of demonstrating. It is quite possible that in this case you will have to additionally acquire the necessary sensors.

Price

The PRC is mainly involved in the production of automobile voltmeters. There are also examples of domestic origin - for example, the Sturman universal digital meters. The price of the electronic version does not exceed 10 Euro. The arrow layout in the tuning version can cost 20 Euros.

Owners, especially of domestic cars, should think about purchasing a voltmeter. The standard diagnostic system is not capable of sending a signal in the form of a battery shown on the instrument panel in advance. The device allows you to control the load on the generator in real time, thereby ensuring reliable battery charging. The low cost of the device is a good reason to purchase it.

Quite a few motorists are faced with such a problem as unexpected battery discharge. It is especially unpleasant when this happens on the road far from home. One of the reasons may be the failure of the car's generator. Helps prevent impending battery drain car voltmeter. Below are some simple diagrams of such a device.

Automotive voltmeter on LM3914 chip

This car voltmeter circuit is designed to monitor the voltage of the car's on-board network in the range from 10.5V to 15V. 10 LEDs are used as indicators.

The basis of the circuit is integrated. This microcircuit is capable of estimating the input voltage and displaying the result on 10 LEDs in dot or column mode. The LM3914 chip is capable of operating in a wide power supply range (3V...25V). The brightness of the LEDs can be adjusted using an external variable resistor. The outputs of the microcircuit are compatible with TTL and CMOS logic.

Ten LEDs VD1-VD10 display the current value of the battery voltage or the voltage of the vehicle’s on-board network in dot mode (pin 9 is not connected or connected to the minus) or column mode (pin 9 is connected to the power plus).

Resistor R4 connected between pins 6,7 and the power supply minus sets the brightness of the LEDs. Resistors R2 and variable resistor R1 form a voltage divider. Using variable resistor R1, the upper voltage level is adjusted, and using R3, the lower one.

As mentioned earlier, this car voltmeter provides an indication of 10.5 to 15 volts. Calibration of the circuit is performed as follows. Apply 15 volts from the power supply to the input of the voltmeter circuit. Then, by changing the resistance of resistor R1, it is necessary to ensure that the VD10 LED (in dot mode) or all VD...VD10 LEDs (in column mode) light up.

Then apply 10.5 volts to the input and use variable resistor R3 to ensure that only LED VD1 lights up. Now increasing the voltage in 0.5 volt increments, the LEDs will light up one by one, and at a voltage of 15 volts, all the LEDs will light up. Switch SA1 is designed to switch between dot/column indication modes. When the SA1 switch is closed, it is a column; when it is open, it is a dot.

Car voltmeter using transistors

The following circuit of a car voltmeter is built on two. When the voltage on the battery is less than 11 volts, the zener diodes VD1 and VD2 do not pass current, which is why only the red LED lights up, indicating low voltage on the vehicle's on-board network.

If the voltage is between 12 and 14 volts, the zener diode VD1 opens the transistor VT1. The green LED lights up indicating normal voltage. If the battery voltage exceeds 15 volts, the zener diode VD2 opens the transistor VT2, as a result of which the yellow LED lights up, indicating a significant excess of voltage in the vehicle network.

Voltmeter on operational amplifier LM393

This simple car voltmeter is built on an operational amplifier. As an indicator, as in the previous circuit, three LEDs are used.

When the voltage is low (less than 11V), the red LED lights up. If the voltage is normal (12.4…14V), then the light turns green. If the voltage exceeds 14V, the yellow LED lights up. Zener diode VD1 forms the reference voltage. This scheme is similar to the scheme.

Automotive voltmeter on K1003PP1 microcircuit

This voltmeter circuit for a car is built on the K1003PP1 microcircuit and allows you to monitor the voltage of the on-board network by the glow of 3 LEDs:

  • When the voltage is less than 11 volts, the HL1 LED lights up
  • At a voltage of 11.1…14.4 volts, the HL2 LED lights up
  • When the voltage is more than 14.6 volts, the HL3 LED lights up

Setup. After applying voltage to the input from any power supply (11.1...14.4V), variable resistor R4 must be used to make the HL2 LED glow.

Surely every person in his life has come across such a device as a voltmeter and knows what its main function is. This is the definition of the value of the circuit. An analog voltmeter is a device with a dial indicator and a scale. Recently, digital voltmeters have gained particular popularity; they are characterized by more accurate readings and compact sizes. This article will talk about a special model of measuring instrument, such as an automobile

th voltmeter. It can be designed as a simple voltmeter or a combined one. A combined car voltmeter contains additional functions, such as a tachometer, thermometer, etc. Let's take a closer look at this device.

The car voltmeter is small, so it can be installed anywhere in the car. Quite often, such a device is combined with a cigarette lighter connector plug. If necessary, you can insert the device into the cigarette lighter and use it to monitor the battery charge in various operating modes. So, the normal battery voltage with the engine “off” is 12.5 volts, and when the engine is running - 13.5-14.5 volts. If the voltage is higher or, conversely, lower than normal, then you need to check the car’s electrical system. A car voltmeter is simply indispensable for those who like to listen to music, especially on a picnic or in nature. It allows you to monitor the battery charge and prevent discharge below normal. Many motorists know that relying on the signals from standard car alarms

Battery discharge alarms are undesirable, since they usually signal when the battery, generator or relay-generator fails, and it is too late to take any action. Automotive allows you to notice changes in the electrical system of the car in a timely manner. There are options for connecting remote displays, so the driver will always see the device readings.

Now let's look at the combined instruments. can be installed anywhere in the car interior, and, if necessary, under the hood. This device allows you to display not only the voltage of the on-board network

But also the air temperature inside the car and outside, as well as the temperature of the car engine, and, of course, the number of engine revolutions. Such devices can be used not only in cars, but also at home to indicate the temperature indoors and outdoors. Sold complete with a car tachometer-voltmeter. In thermometer mode, the sensors are capable of measuring temperature in a specified range from -50 to +127 degrees Celsius. You can connect this sensor yourself, or you can entrust it to an auto electrician.

Here we briefly looked at what a car voltmeter and combined instrument is. Knowledge of how to use these devices will be useful to every car owner.