#the4thLichuangcompetition#18650 stepless dimming LED touch light

Note: * is required.

[Please fill in during the registration stage↓] * Brief introduction to the work: 18650 stepless dimming LED touch light

[Please fill in during the competition stage↓]   1. Details of the work; 18650 charger + power bank + stepless touch LED dimmer (with mode selection switch).   2. Describe the challenges faced by the work and the problems it solves; the challenge is chip selection. The initial plan is to use lithium batteries to boost the voltage and then use the PT4115 constant current LED driver chip, but how to control the boost circuit to turn on using SGL8022W? When building the circuit of PT4115 using perforated boards, it was found that it cannot work below 4.5V, so a boost circuit must be used. In this way, the loss of the boost plus the loss of PT4115 will be even greater. After that, I switched to the PT4110 chip, which is affordable, and the PT4117 is too expensive. The picture below is a temporary hole debugging board: after the board was returned, VBAT was issued. The network was not connected together when drawing, and when switching VBAT and 5V When powering, it was found that the light cannot be dimmed under 5V. The DIM pin has a voltage of 3V when powered by 5V. SGL8022W can only output a Pwm signal up to 2.5V. Change the pull-down resistor of the DIM pin to 1K and change R9 to an IN4148 switching diode. Tested that all functions are normal! I came back for testing on Sunday night and found that when powering the LED touch control and LED circuit under the power bank function, the 5V power supply will turn off in about a minute, causing the LED light to not light up. The analysis is that the current is too small during the power bank function, resulting in IP5306 I mistakenly thought it was a no-load state and turned off the output in power-saving mode. It seems that I still can't use 5V boost to power the LED circuit. I plan to use the switch to directly control the power supply of SGL8022W. Turning off the touch will turn off the LED constant current driver. The picture below For the final circuit:

* 3. Describe the key points involved in the hardware and software parts of the work; There are several optional parts on the PCB that do not need to be soldered (NC1, NC2 and C9, choose one from NC3, NC5, NC6, R5, VCC light-emitting diodes, do not solder these) ), the others will work normally after being soldered. The connecting wire between the touch IC and the touch pad should not be too long. Control the temperature and time when welding the LED patch light!

  4. Material list of the work; Detailed BOM is in the project attachment.   5. Upload the picture of the work; (the PCB must have the competition logo and take a photo and upload it. If not, it will be deemed as giving up the competition) PCB blank board and finished product: I think this should be the competition for this year This is the board with the most logos in Lichuang!

* 6. Demonstrate your work and record it as a video for upload; (The video content must include: introduction of the work; function demonstration; performance test; close-up shot of the competition logo on the PCB. Failure to do so will be deemed as giving up the competition) Video link: https://v .youku.com/v_show/id_XNDM1NDY2NzU1Ng==.html?x&sharefrom=android&sharekey=68b6c780ed08eed587b21e095ec8ade32 7. Open source documents: All open source: https://lceda.cn/editor#id=|53e9a78442fd4f22b3e8a3f393a8e00 a|a7f469d0c81e456b84dd28ac1ec0dace|a981a1015db9406a9515a57f6bc8c6e6|9712565e90084d1ba342af554d6de361