Capacitive Touch Switch Module Constant Voltage LED Stepless Dimming Touch Dimming PWM Control BoardItem NO.: Touch PWM

Capacitive Touch Dimmer PWM Control Board

Functional Features:

The touch dimming module can achieve touch switch control and brightness adjustment of LED lights. It has the following functional features and advantages:

1. The lighting brightness can be adjusted as needed, with a wide selection range and simple and convenient operation.

2. The touch function can be realized with isolation protection of media (such as glass, acrylic, plastic, ceramics, etc.), with high safety.

3. Wide application voltage range, selectable from 2.4 to 4.5V.

4. Simple application circuit, few peripheral devices, convenient processing, and low cost.

5. Good anti power interference and mobile phone interference characteristics. EFT can reach above ± 2KV; Touch response sensitivity and reliability are not affected by close range and multi-angle phone interference.

6. Installation: Without direct contact with copper foil, it is possible to adjust the light across more than 3mm of acrylic glass or plastic.

7. Purpose: Can control LED modules, light strips, and other products. Suitable for indoor table lamps, LED lighting dimming, DIY lamp dimming conversion best accessories.

8. Function: Single line touch, using the capacitive touch principle, sensing sensitive touch is available. The default is LED touch stepless dimming with switching function, dimming function, and brightness memory dimming function. Turn the light on slowly and turn it off slowly, effectively avoiding eye irritation.

9. Dimming mode: stepless PWM dimming

10. Wiring method: In the PCB board, (VCC, GND) is the power input, (LED+, LED -) is connected to the positive and negative levels of the LED lamp (fingerprint) is connected to the touch area, and can also be wired out (note that the wiring should not be too long, and it is recommended to use a small copper sheet as the sensing area after wiring out). The copper sheet area is recommended to be around 2x3cm. The built-in copper foil module on the board attaches one side of the copper foil to the housing side.

11. Usage:

a) When the touch is clicked (the touch duration is less than 550ms), the lighting control can be achieved. Click and touch once, and the light will be on; Click and touch again, and the light goes out. The initial brightness at which the light is lit is fixed at 90% of full brightness.

b) Long press and touch (touch duration greater than 550ms) can achieve stepless brightness adjustment of the light. Press and hold the touch for a long time to gradually increase the brightness of the light. When released, the brightness of the light stops at the corresponding brightness at the release time. If the press and hold time exceeds 3 seconds, the brightness of the light will not change after reaching the maximum brightness; Press and hold the touch again and the light brightness gradually decreases. When released, the light brightness stops at the corresponding brightness at the release time. If the press and hold time exceeds 3 seconds, the light brightness will not change after reaching the minimum brightness. This cycle.

12. Debugging tips:

If a false trigger occurs during debugging, or if it is not triggered, it may be caused by the following reasons:

a) The touch line is too thick

b) The touch line is too long

c) The copper sheet is not large enough

d) Interference near switching power supply terminal

e) Touch parameter C1 is unreasonable

Technical Features:

◆ TI touch input corresponds to LED light control output. There are four functions available, which are determined by the input status of the T1 and T2 pins before they are powered on. The details are as follows:

1. T1=1, T2=1 corresponds to: LED touch stepless dimming function without brightness memory, sudden brightness and sudden darkness

2. T1=0, T2=1 corresponds to: LED touch stepless dimming function without brightness memory fading

3. T1=1, T2=0 corresponds to: LED touch stepless dimming function with brightness memory fading

4. T1=0, T2=0 corresponds to LED three-segment touch dimming function

◆ LED touch stepless dimming function without brightness memory:

△ When initially powered on, the lamp is turned off.

△ When clicking and touching (the touch duration is less than 550ms), the lighting control can be achieved. Click and touch once, and the light will be on; Click and touch again, and the light goes out. This cycle. When the light is turned on or off, there is no brightness buffer. And the initial brightness of the lighting is fixed at 50% of the full brightness.

△ When pressing and touching for a long time (the touch duration is greater than 550ms), stepless brightness adjustment of the light can be achieved. Press and hold the touch for a long time to gradually increase the brightness of the light. When released, the brightness of the light stops at the corresponding brightness at the release time. If the press and hold time exceeds 3 seconds, the brightness of the light will not change after reaching the maximum brightness; Press and hold the touch again and the light brightness gradually decreases. When released, the light brightness stops at the corresponding brightness at the release time. If the press and hold time exceeds 3 seconds, the light brightness will not change after reaching the minimum brightness. This cycle.

△ Click touch and long press touch can be freely used at any time, and their functions are not subject to interference and restrictions.

◆ LED touch stepless dimming function without brightness memory is based on the LED touch stepless dimming function without brightness memory sudden brightness sudden dimming. When clicking on the touch to turn on and off the light, the light slowly and smoothly transitions from a lower brightness to the initial brightness of the light on. When clicking on the touch to turn off the light, the light slowly and smoothly decreases from the current brightness until it turns off, achieving a visual buffer effect of slow brightness change, It has the effect of protecting eyes and eyesight.

◆ LED touch stepless dimming function with brightness memory fade is an addition to the LED touch stepless dimming function without brightness memory fade. That is, when the power supply is continuously powered on, the brightness of each touch to turn off the light will be remembered, and the next time you click to turn on the light, the brightness will be used as the initial brightness. In the event of a power failure, the initial brightness is fixed at 50% of the full brightness after the first touch to turn on the light after re powering on.