Through this event, the previous colorful silk-printed snowflake lanterns were upgraded again. The previous snowflake lanterns had many areas that needed to be optimized. This time, we absorbed everyone’s opinions, added slots for the LED filaments, and redesigned the colorful lanterns. The silk screen pattern and white overall style are more beautiful. At the same time, the interface is replaced with a 6P plug that is easy to solder, which is more convenient for novices to solder. At the same time, a new base is designed, and it also comes with a beautiful shell. The shell panel uses a transparent acrylic panel. The color silk screen printing on the base plate can also be clearly seen.

The introduction written earlier:

This time the project is based on the [Snowflake Lamp] color screen printing version - JLC EDA open source hardware platform (oshwhub.com). This project is an upgraded version of the project. It also continues to use the modification based on the mondraker boss. If you If there is no color silk screen, it is recommended to copy the original version of the big brother, which will be more suitable for touching the infinitely dimmable snowflake lamp (ceramic filament) (novices can also do it!) - JLC EDA open source hardware platform (oshwhub.com)

This project has been upgraded due to the color screen printing of LC. The printed pattern is clearer and more delicate, and the pad expansion is more accurate. It is much better than the last color screen printing. Good, good, too much! ! ! ! ! !

For this project I also made a beautiful base! !

1. Project schematic diagram:

1-1 Snowflake lamp overall schematic diagram display:

Because there is only one type of snowflake lamp, there is only one schematic diagram, which is very simple and clear. You can see that the snowflake lamp only needs the SGL8022W touch chip and simple peripheral circuits to drive it normally.

I checked the manual and found that the different sizes of the sampling capacitance of the SGL8022W touch chip will affect the sensitivity of the touch. I will try to verify it later when I have the opportunity.

1-2 SGL8022W touch chip:

The snowflake lamp uses the SGL8022W touch chip and a simple peripheral circuit to drive the LED. The LED can be dimmed and controlled by touch. The different states of OPT2 and OPT1 will also cause the touch effect of the SGL8022W touch chip to have different states.

There are four functions available, which are input by OPT1 and OPT2 pins before power-on.

Determined by status. The details are as follows:

1. OPT1=1, OPT2=1 corresponds to: LED touch stepless dimming function without brightness memory.

2. OPT1=0, OPT2=1 corresponds to: LED touch stepless dimming function without brightness memory and fading in and out.

3. OPT1=1, OPT2=0 corresponds to: LED touch stepless dimming function with brightness memory and fading in and out.

4. OPT1=0, OPT2=0 corresponds to: LED three-segment touch dimming function.

1-3 Touch pad:

Touch state dimming instructions corresponding to different power-on input conditions:

◆The LED touch stepless dimming function without brightness memory is as follows:

△When initially powered on, the light is off.

△When you click and touch (the touch duration is less than 550ms), you can control the light on and off. Click and touch once and the light will be on; click and touch again and the light will be off. And so on. There is no brightness buffer when the light is on or off. And the initial brightness of the light is fixed at 50% of full brightness.

△When you press and hold the touch (touch duration is greater than 550ms), the light brightness can be adjusted steplessly. Once you press and hold the touch once, the brightness of the light will gradually increase. When you release the touch, the brightness of the light will stop at the brightness corresponding to the moment of release. If the touch is held for more than 3 seconds, the brightness of the light will not change after reaching the maximum brightness; press and hold again, the brightness will stop at the brightness corresponding to the moment of release. The brightness of the light gradually decreases. When you release the button, the brightness of the light stops at the brightness corresponding to the moment of release. If you press and hold for more than 3 seconds, the brightness of the light reaches the minimum brightness and does not change again. And so on.

△Click touch and long press touch can be used at any time without interference or restrictions on each other's functions.

◆ The LED touch stepless dimming function without brightness memory is based on the LED touch stepless dimming function without brightness memory. When the light is turned on and off by clicking and touching, the light is slowly and smoothly transitioned from a lower brightness to the initial brightness of the light. When the light is turned off by clicking and touching, the light is slowly and smoothly reduced from the current brightness until off. So as to achieve the visual buffer effect of slow changes in brightness, play a role in protecting the eyes and vision.

◆ The LED touch stepless dimming function with dimming and dimming memory is based on the LED touch stepless dimming function without dimming and dimming memory, adding the brightness memory function. That is, in the case of continuous power supply of AC220V, the brightness of each click and touch when the light is turned off will be remembered, and the next click and touch when the light is turned on will be the initial brightness. In the case of power failure of AC220V power supply, the first click and touch turn on the light after repowering, and the initial brightness is fixed to 50% of the full brightness.

◆LED three-stage touch dimming function

△ When initially powered on, the light is off.

△Every time you click and touch, the light brightness will cycle through low brightness → medium brightness → high brightness → off.

1-4 Touch sampling capacitor:

The selection of different sampling capacitors will affect the sensitivity of the touch. For details, see the instructions in the table above.

1-5 LED connection circuit:

The snowflake lamp uses a total of 6 26mm3V ceramic filaments, retro imitation tungsten filaments. It should be noted that the filaments have positive and negative levels, so you need to pay attention when welding.

The end with holes is the positive level, and the end without holes is the negative level. Because the board uses color silk screen printing, there are no positive and negative marks on the board. You need to see the actual picture to compare the welding.

1-6 6P TYPE-C：

Choose to directly use the 6P TYPE-C interface for power supply. In order to facilitate welding, at the same time, in most cases, everyone uses the AtoC data cable for power supply, so we directly abandon the use of CtoC power supply. If the light does not light up when welding is normal, You can check to see if your cable has C-tip cables on both ends, try another AtoC data cable and try again.

2. Physical Display:

2-1 Physical appearance:

The current color silk screen printing effect is very good, the color is full and the picture quality is delicate. When you are very close and magnify, it is very beautiful and delicate! !

 2-2 Display with base:

What has been verified so far is this base without a shell. This base has two problems. One is that the type-c female base is a sunken plate. It will be a little uneven when the cable is plugged in. It should be replaced with a horizontal one. It will be flat. The second problem is that due to the pattern soldering mask on the front, there is a position where the positive and negative are close to each other, which is prone to the risk of short circuit. I have changed the positive wiring of the power supply to the back, so that This problem is avoided.

What needs to be mentioned is that this base uses a 16P male TYPE-C plug. The pins are very short and cannot be soldered with an electric soldering iron. You can only use a heating table or a hot air gun to solder. If you do not have these two tools, , advise you to give up making the base.

2-3 Welding diagram:

The directional welding precautions have been marked in the picture above. You can compare the actual welding positions of the actual objects by yourself, because the snowflake lamp with color silk screen printing has only left the soldering pad position in order to pursue beauty, and other components are marked. Cleared. Although type-c has been replaced with a 6P plug that is easy to solder, you still need to check whether the pins are connected to the tin. 80% of the problems are caused by short circuit of type-c pins. If If there is no tank capacitor, you can directly replace it with a chip capacitor of equal capacitance and solder it.

2-4 Base Display:

White base display without casing:

This is the modified 3D preview of the base. Some minor flaws have been corrected. The TYPE-C female base is more suitable for placing the bare board on the desktop.

Color silk screen base display without shell:

Base display with housing:

3. Shell Part

3-1 Snowflake lamp shell:

This time, the shell is also integrated together to facilitate ordering and production. There is nothing to say about the acrylic on the front. Just pay attention to the thickness. The thickness of 2.8mm is just the same as the height of type-c.

What you need to pay attention to is that there is a difference between the front and back of the acrylic on the touch surface, because the shape of the snowflake lamp is not a completely symmetrical figure, so if the edges of the acrylic on the back are found to be uneven during installation, it is not a problem with the acrylic cutting, but the shape of the pattern itself. It is not completely symmetrical, just turn it over. The second issue is about the ability of the sampling capacitor to adjust the touch sensitivity. What I tested was that when the thickness of the acrylic was only 0.5mm, the snowflake lamp could be controlled through the acrylic touch. Later I I will verify whether the touch sensitivity can be adjusted by replacing the capacitor with a larger value, so that the snowflake lamp can be controlled through acrylic without having to make holes on the touch surface of the snowflake lamp, which will be more convenient.

3-2 Base shell:

4. Announcements:

4-1: Things to note when placing an order for PCB:

When placing an order for color silk screen printing, you need to note that it is a little different from the usual PCB ordering situation.

Remember to choose white for the color screen printing solder mask color, and check the free immersion gold color screen printing. The most important thing is that the character technology also needs to choose JLC EDA color screen printing. Everything else is the same as the normal single selection. One thing to note is that color screen printing does not include guest editing by default! So you don’t have to choose a designated location and add guest editors separately! There is no need to add the location mark "jlcjlcjlcjlc" on the board!

4-2: Component purchase:

The basic components of the snowflake lantern can be purchased at LCSC. You can place an order through the BOM at the bottom. However, it should be noted that there are no filaments and chips in the BOM. Also, this BOM only includes the snowflake lantern. For the components of the base, you need to switch to the page of the base to place an order (just two TYPE-C heads)

It should be noted that the SGL8022W touch chip is not available in LCSC, so when you buy it on Taobao, you need to check whether the specific model is the SGL8022W touch chip. If the silk screen is different, it may have different effects.

There is another LED filament that is not available in LCSC. You just need to pay attention to the length of the purchase. As long as it is 26mm, warm white is recommended for color. Other colors are based on personal preference.

There are also screws used to connect the acrylic panel. The specifications of the acrylic screws used to connect the snowflake lamp shell are M2*8mm screws and M2 nuts. The screws used on the base shell are M3*10 (actual verification is that M3*7 is just the right length). Screws and M3 nuts (you don’t need to buy these screws if you don’t need a shell)

4-3: Final words:

I haven't decided what to say yet.

Maybe there will be skins for other festivals in the future? I’ll talk about it when I have time to make the shape of the snowflake lantern symmetrical.

More production process demonstrations will be placed on station b, video link: https://www.bilibili.com/video/BV1Ce41117w9/?vd_source=6ba00df791ada7419eb2b9ce27391d06