See above for our completed circuit on perf-board. The pull-down resistors prevent these problems.Įxcept for the two sets of 3D LED Matrix displays, we hook up the entire circuit on a small piece of perf-board around 110mm x 30mm. The 3D LED Matrix display's MAX7219 ICs can see this as valid data and display garbage until the micro-controller gains control. When power is first applied to the micro-controller or when they are reset, their I/O lines float. Note the use of 12Kohms pull-down resistors on the LOAD input pins for the 3D LED Matrix displays.
An Arduino Nano is used here to control the entire electronic circuit setup. The two sets of 3D LED Matrix displays completed in Step 1 are connected together with the two MSGEQ7 ICs and micro-controller as shown in the wiring diagram above.
The wiring connection diagram above shows how a MSGEQ7 IC is typically connected. We need two MSGEQ7 ICs here, one for the left and another for the right audio channel. All we need is to read these DC values with the microcontroller analog input and output the spectrum to the 3D LED Matrix displays. The seven frequencies are peak detected and multiplexed to the output to provide a DC representation of the amplitude of each band. By feeding an audio signal to it, it will filter out seven frequency bands centered around 63Hz, 160Hz, 400Hz, 1,000Hz, 2,500Hz, 6,250Hz, and 16,000Hz. The MSGEQ7 IC is a single channel seven band Graphic Equalizer Display Filter. We will basically be using two MSGEQ7 IC chips made by Mixed Signal Integration to separate the audio into bands. Our 3D stereo audio spectrum visualizer shall be driven by an Arduino Nano. You may view the following YouTube video to see what we will be building. To build this project, basic electronics knowledge with electronics component soldering skill and some knowledge on using the Arduino are required. In this instructable, we will use the electronic circuit we put together from our Arduino based Audio Spectrum Visualizer project to drive our jolliCube re-arranged with the 2 sets of 3D 8x8x4 LED Matrix displays placed side by side to form a 3D Stereo Audio Spectrum Visualizer Display. Recently, we stumbled upon a 3D Audio Spectrum on Analyzer on YouTube. We are very encouraged to know quite a few entry level electronics hobbyists has bit the bullet and managed to successfully complete their 8x8x8 jolliCube instead of working on a smaller LED Cube as their first cube. You may check it out at Ī few months ago, we designed jolliCube, an 8x8x8 LED cube. In one of our earlier instructables, we built an Arduino based Audio Spectrum Visualizer using our bi-color LED Matrix modules for the display.
0 kommentar(er)
