Professional craftsmen and experienced motorists know that in the list of primary tasks when upgrading an old or purchasing a new car, the item “buy a voltmeter in a car in Moscow” is listed for a reason. After all, in fact, a small device installed in a 12V or 24V cigarette lighter socket allows you to measure the input voltage of DC and AC in the electrical circuit of a car, as well as measure the level of internal resistance with the highest accuracy!
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A rare manufacturer displays information that allows you to monitor the operating conditions of DC generation systems on the dashboard of a car. As a result, a pulse indicator informing about the state of the car's battery lights up only when the battery is completely discharged. That is why both experts and experienced drivers advise to buy a digital voltmeter in the car. In addition to the fact that the device will display the voltage of on-board networks in real time, using the data obtained, you can determine the level of load on the generator, which will help to avoid various problems in the cold season. Moreover, having such data, the car owner can conduct an independent assessment of on-board networks for operability.When choosing an autovoltmeter, you should remember the voltage of the on-board system (12 or 24 V), which affects the range of measurements. Information displayed on the digital display of the device, will help to avoid breakdowns and premature wear of the battery, providing the owner of the car with real information about the condition and charge level of the battery, thereby allowing you to protect it from premature wear caused by non-compliance with the basic rules for care.
Where is it better to order a digital voltmeter in the cigarette lighter at a low price?
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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 application for all technological devices that make human life convenient and interesting. Even for the most inexpensive machines, there are touch-screen multimedia centers that bring novelty to the pilot's workplace. Although, due to the large modernization, part of the control devices is 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 buy these 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 the 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 dead. When installing a voltmeter, the driver constantly monitors the voltage and ensures that the battery is constantly charged. This can be done by turning off all unnecessary "consumers" of power, such as a radio, heated seats, and so on.
A large assortment voltmeters happens 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 if the model has a DC circuit marking. It is shown as a straight line at the very bottom of the dial.
Installation of the device is possible in different places of 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 "fancy" electronic voltmeter, which has a microcircuit capable of showing the following parameters:
- Temperature outside and inside
- Speed
- current time
Most of the devices are made in China. There are also domestic models, for example, Navigator. Electronic versions have a cost of around $10, but analog versions in the tuning version can cost $20.
Car owners, especially domestic ones, should consider buying a voltmeter, since standard systems usually do not signal a low battery in advance. The device also monitors the load on the generator in real time and provides battery protection.
How to install a voltmeter from Aliexpress to the car?
- First, check the wiring kit to all components were ok
- Connection is best done with protective glasses.
- Disconnect the negative cable from the battery
- Install the instrument in the 2 1/16 inch (5.24 cm) holes in the dashboard
- Secure it with brackets and nuts from the kit.
- Connect the black wire from the voltmeter to 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 option to buy more. For example, and only for a purchase from a phone, many products are provided with an additional discount. There is also a remarkable section here, where good goods are played daily. If you are lucky, the purchase will cost only 1 cent. In addition, there is a section where every day you can collect coins and grow them, for which discounts on goods are also provided.
In the computer version of the site, all this is not available, but there are many sales here. They are regular and large. The former are held every day and these include, "Deals of the Day at the Mall" And
Voltmeter for a car on Aliexpress: reviews
Victor: The device is quality. I bought a USB model, because I don’t like to mess around with all sorts of wires. It works clearly, double-checked the readings with a multimeter, everything converges. So I'm happy.
Leonid: The voltmeter is made qualitatively. I installed it myself for the first time, in principle, there is nothing complicated. All indications are shown on the display, everything is correct. I will be ordering more for a friend!
Ilya: I bought a cigarette lighter model. For some reason, the screen flickered at first, but this is more likely a matter of the cigarette lighter. The device itself is high quality and accurate.
Video: Voltmeter in a car with Aliexpress
A modern car should have an on-board computer with functions for monitoring the state of a 12 V battery. However, in the absence of this module, it is easy to assemble it yourself. Here is a diagram of a voltage meter at the car battery terminals. It is really needed, because if the battery charging system is not working properly, the battery does not receive the proper charge voltage (about 13.8 V for a 12 V battery). This simple electronic system for an automotive battery and charging system plugs into a cigarette lighter socket and displays the output voltage at the battery terminals on a 4-digit, seven-segment LED display.
The PIC16F1827 microcontroller is the main element in this project, which uses a built-in fixed voltage reference (FVR) module, which allows very accurate analog-to-digital conversion of the battery voltage. When the engine is off, the voltage measures the actual output voltage from the battery. But if the car's engine is running, it actually measures the charge voltage of the entire battery coming out of the car through the charging system (alternator + rectifier). The functional block diagram of the project is shown below.
Here, the +5 V voltage for powering the PIC16F1827 microcontroller is derived from a +12 V car battery using any stabilizer (for example, LM7805). The voltage at the battery terminals is measured using the PIC16F1827 ADC.
In the FVR module, inside the MCU, a value of 4.096 V is selected to obtain a stable positive reference voltage - for accurate analog-to-digital conversion. Before being fed to the ADC, the battery output voltage is lowered below the reference voltage using a voltage divider. The measured instantaneous value of the battery voltage is displayed on a 4-digit LED display.
Automotive voltmeter circuit
The project outline is shown above. The microcontroller uses the AN4 channel of the ADC to measure the voltage at the battery terminals. On resistors R1 and R2, at the input of the ADC, a simple voltage divider is made. The maximum measurable input signal voltage at point AN4 is 4.096 volts (limited by the use of an internal voltage reference for analog-to-digital conversion). Therefore, the maximum input voltage (VBattery) can be obtained from the following equation:
4.096 V = R2 C * VBattery / (P1 + P2), then VBattery = 16.93 V.
The input voltage range can be increased by simply lowering the value of R2. The zener diode is placed in parallel with R2 to prevent the microcontroller's ADC voltage from going above 5.1 V. Otherwise, any accidental high input voltage could damage the microcontroller port.
The measured voltage is shown on a 4-digit common cathode LED display. The seven segments (a-g) and the decimal point (dp) are driven through a portb of the PIC16F1827. The microcontroller operates at a frequency of 500 kHz using an internal clock source. The ULN2003 assembly provides the correct current for each of the common cathodes of the LED module.
The firmware for the project was developed in mikroC Pro for the compiler. Using the internal voltage reference for A/D conversion requires configuration of the FVRCON and ADCON1 registers. The full source code can be downloaded from the link.
How to use the device
Plug the device into the cigarette lighter socket and turn the car key to the ON position without starting the engine. This will display the voltage value of the car battery (about 12 V). After starting the engine, the battery begins to receive charging voltage from the generator. This voltage should be higher than the actual voltage of the battery itself (about 13.8V).
A voltmeter with REM came to me by mail from China. First of all, I checked his work at home using a computer power supply. And by the way, let me tell you something else. some people wrote to me that REM does not work on them, and that the voltmeter works constantly, even when the GU is turned off. At first I thought so too.
What's the matter? That's what. Three wires come out of the device circuit - red, black and white. We are all used to the fact that “+” is red, and black is “-“, well, we can assume that white is REM. It was not there, and those who have problems with the operation of this device - remember! Red is plus, white is minus, and black is REM. let's get back to work. how it works - I liked it, I looked at the trial connection to the power supply.
But personally for me there was also a minus - the numbers glow too brightly, at night they will blind and attract a fair amount of attention. We take a piece of tint film, and disassemble. everything is very simple - the circuit with the indication is held in the case by two latches - we push them apart and remove the filling.
We take out the scattering glass. One side is smooth, the other is rough.
I decided to put it in the edging of the instrument cluster, there is just enough space on the left. I didn’t take off the process of making the hole itself - I marked the size, and drilled along the contour, then finished the rough edges with a file and voila)))
Back side.
In the REM car, I threw it on the radio, and threw the + and - wires themselves onto the amplifier terminals, since the voltmeter will show us all the drawdowns directly from there. There is an adjustable resistor on the voltmeter. I adjusted the readings with a multimeter. Well, actually a photo of everything installed and in work.
Thank you all for your attention)) good luck and 14+ volts to you)))