11/16/2023 0 Comments Vu meter leds![]() ![]() Now in void loop() function we read the analog value from the A5 pin of Arduino and store that value in a variable namely ‘value’. Here i=3 is the third pin of Arduino and whole for loop will initialize the pin D3-D10 of Arduino. Here we can see a for loop in which we initialize the value of i=3 and run it to 10. In the given void setup() function we initialize the output pins for LEDs. I just keep in mind the connection and write code directly. Here in this code we haven’t given any name to particular LED. Program of this Arduino VU Meter is very easy. The Snapshot of Top layer of PCB layout from EasyEDA, you can view any Layer (Top, Bottom, Topsilk, bottomsilk etc) of the PCB by selecting the layer form the ‘Layers’ Window. We have made the Circuit and PCB design of this VU Meter Shield public, so you can just follow the link to access the Circuit Diagram and PCB layouts. If you need to connect LCD then you can connect the LCD at J1 and J7 (see below circuit) with connections like lcd(14, 15,16,17,18,2). Audio Jack is directly connected at analog pin A5 of Arduino. Circuit for this project is very simple, we have a connected 8 LEDs at pin numbers D3-D10. Also we have two options to apply audio signal to this board that are direct to pins or by using audio jack. Here in this shield, we have used some SMD components that are resistors and LEDs. But here in demonstration of this project we have assembled only LEDs, audio jack and power LED. We can add some more option in this Shield by connecting LCD, ESP8266 Wi-Fi module, DHT11 H&T Module, voltage regulator, more VCC, +5v, +3.3v and GND pins. In this VU Meter Arduino Shield, we have used 8 LEDs, in which 2 LEDs are of Red color for Higher Audio Signal, 2 Yellow LEDs are for mediate audio signal and 4 Green LEDs are for Lower audio Signal. The following is a list of the passive components used: - 2*100n, - 5*2k7, - 2*0R.For designing VU Meter Shield for Arduino, we have used EasyEDA, in which first we have designed a Schematic and then converted that into the PCB layout by Auto Routing feature of EasyEDA. Including IC LM3915 and LM358 which require passive components. ![]() For the process of making PCB I will explain in the next stepĪn IC sometimes requires supporting passive components such as resistors and capacitors. So that the VU meter can work as desired. PCB is used as a place for components and circuit lines. PCB has an important role in this project. in this circuit I use it to control the audio signal from the microphone to the LM3915 IC input Trimpot including variable resistor type. by using a microphone vu meter can measure the audio signal that comes from the surroundings, for example, human voices and so on The first comes from the music amplifier input and the second comes from the Microphone. There are two sound sources for the VU meter that I made. in this circuit I use the LED to display the audio signal strength level. In simple terms, LEDs are electronic components that can emit light. in this circuit, I use the LM358 op-amp to raise the audio signal level. The operating temperature ranges from 0˚C to 70˚C at ambient whereas the maximum junction temperature can be up to 150˚C. The typical supply current is 500uA independent of the supply voltage range and a maximum current of 700uA. The default input offset voltage is very low which is of magnitude 2mV. The differential input voltage range can be equal to that of power supply voltage. It can be considered as one half of LM324 Quad op-amp which contains four op-amps with common power supply. LM358 is a dual op-amp IC integrated with two op-amps powered by a common power supply. The whole display system can operate from a single supply as low as 3V or as high as 25V. LED current drive is regulated and programmable, eliminating the need for current limiting resistors. ![]() One pin changes the display from a bar graph to a moving dot display. The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs,LCDs or vacuum fluorescent displays, providing a logarithmic 3 dB/step analog display. ![]() And below are the components needed along with a little explanation: Of course, what is needed to make this project is an electronic component. ![]()
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