Soldering Precautions:

1. Correctly distinguish between positive and negative (PCB front right is LED negative)

How to distinguish the positive and negative of LED, three methods:

①At the front sidehas one or two green dots is negative;

②Triangle tip side is negative;

③If you have a multimeter, can use a diode test directly;

  1. Special Note: Be sure to welding right direction!

Method 1: SCM smallest dot on the screen gap (new microcontroller 2-3 dots, the smallest dot, or a dot in dot dots)

Method 2: SCM "STC" sign can be consistent with the following figure

3.The temperature sensor soldering Note: The temperature sensor DS18B20, left of flat face is 1 foot.

Debugging Details:

  1. The product comes with a combo cable, one side is the USB power or use with USB interface charger, the other side is audio input 3.5mm interface, first plug the audio splitter into the computer or other devices with 3.5mm headphone audio output interface, and then oneside of the audio splitter connect spectrum and the other side connect an external audio device (as long as you can drive headphones you can also drive spectrum);
  1. When plug into USB supply, but not into the audio side, the spectrum will sense the beating is a normal situation, since the input terminal is vacant;
  1. After inserting audio,in the case of audio equipment mute, the spectrum will show the bottom line (if still beating, please check the audio jack and the splitter is good contact,under silent modeif there is noise, check the splitter and headset is plugged in the end) Playing music, the spectrum will beat with the music, if the amplitudesmall or does not move, adjust the volume, if the spectrum is easy to full screen display, turn down the volume of computer, general computer volume to about 50-60%.
  1. LED NO lights solution:

The most common is a vertical column in this column does not shine ---- ①corresponding MCU pin lack of solder, just resolder it; ②this column has an LED short circuit, check with a multimeter diode file can be ruled out.

Welding renderings, LED welding positive and negative:

Near the buttonside is LED negative

Back side:

DS18B20 temperature sensor :

(welding direction sensor see figure below, do not weld backwards)

The back button Installation: