Capacitor touch PWM control board with constant voltage type LED control board

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Introduction

  • Touch tone module can realize the LED light touch switch control and brightness adjustment. Features and advantages as follows:

  • The light brightness can be adjusted according to need, a wide range of options, the operation is simple and convenient.

  • Exept in a medium (such as glass, acrylic, plastic, ceramics etc.) isolation protection under the touch function and high safety.

  • Application of wide voltage range, can be arbitrary choice between 2.4~4.5V.

  • The application of simple circuit, few peripheral devices, convenient processing, low cost.

  • The anti interference and interference characteristics of mobile phone power supply. EFT can reach + + 2KV above; in the near distance, multi angle mobile phone interference,

  • Touch sensitivity and reliability are not affected.

  • Installation: no direct contact through the copper foil, more than 3mm of acrylic glass or plastic dimming.

  • Uses: LED module can be controlled, lamp and other products. Applicable to indoor table lamp, LED lighting dimming, DIY lamp dimming modification of the best accessories.

  • Features: single line touch, the use of the principle of capacitive touch, sensing sensitive tentacles can be. The default is a switch function, dimming function, memory with brightness dimmed LED touch stepless dimming function. The lights slowly brighten, turn off the lights when getting dark, avoid the stimulation of the eyes.

  • Dimming mode: stepless PWM dimming

  • Wiring mode: PCB (VCC, GND) for power input, (LED+, LED-) for the LED lamp is connected to the positive and negative level (fingerprint) for the touch area, can also be used to draw (note that the connection is not too long, after the introduction of a small piece of small copper skin to do induction zone), copper skin area of the left 2x3cm. Board with copper foil copper foil module side in the shell side.

Using method

  • A) click on the touch (touch duration is less than 550ms), can realize the light of the light control. A click on the touch, the light is on; once again, click on the touch, the lamp is off. The initial brightness of the light is fixed to 90% of the total brightness.

  • B) by touching the touch (duration greater than 550ms), it can realize the stepless brightness adjustment of the light. A minister in the touch, the brightness of the light gradually increased, when loosening the brightness of the light stopped at release time corresponds to the brightness, if long press for more than 3 seconds, the brightness of the light reached maximum brightness does not change; again minister in the touch, the brightness of the light gradually decreased, when loosening the brightness of the light stopped at release time corresponds to the brightness, if long press for more than 3 seconds, the brightness of the light reached minimum brightness is no longer

  • Of. Such a cycle.

  • Debug tips

If you are debugging, or do not trigger, may be the following reasons

A) the touch line is too thick

B) touch line is too long

C) the copper skin is not large enough

D) near the switching power supply side of the interference

E) the touch parameter C1 is not reasonable

Features

The TI touch input corresponding LED control output. A total of four types of features are available, from the input of the T1 and T2 pins on the front

  • State to decide. Specifically as follows:

  • T1=1, T2=1: not corresponding with brightness memory process LED touch Ming Tuan stepless dimming function

  • The T1=0, T2=1 corresponding with brightness: no memory dimmed LED touch stepless dimming function

  • T1=1, T2=0: corresponding with brightness memory dimmed LED touch stepless dimming function

  • The T1=0, T2=0: LED three corresponding touch light regulating function

  • I don't take sudden sudden dark brightness memory Ming LED touch stepless dimming function is as follows:

  • After the initial power supply, turn off the lights for the state.

  • A click on the touch (touch duration less than 550ms), bright lights can be controlled. A click on the touch, the light is on; once again, click on the touch, the lamp is off. Such a cycle. When the light is on or off, there is no light buffer. And the initial brightness of the light is fixed for the full brightness of 50%.

  • A long press touch (touch duration greater than 550ms), the light can realize stepless brightness adjustment. A minister in the touch, the brightness of the light gradually increased, when loosening the brightness of the light stopped at release time corresponds to the brightness, if long press for more than 3 seconds, the brightness of the light reached maximum brightness does not change; again minister in the touch, the brightness of the light gradually decreased, when loosening the brightness of the light stopped at release time corresponds to the brightness, if long press for more than 3 seconds, the brightness of the light reached minimum brightness does not change. Such a cycle.

  • A click on the touch and press the touch can be used at any time, each function without interference and restriction.

  • Without brightness memory fadein gradually dark led touch stepless dimming function is led in with brightness memory process Ming suddenly dark touch based on the function of stepless dimming, in touching the lights going on and off, by the light from a lower brightness slow smooth transition to turn on the lights at the initial luminance, in touching the lights so that the light by the current brightness slowly and smoothly reduce until Guan Mie, so as to achieve the visual buffer in slow changes in brightness, to protect the eyes and vision effect.

  • Brightness memory fadein gradually dark led touch stepless dimming function is in without brightness memory fadein gradually dark led touch stepless dimming function based on increased brightness memory function. That in case of electrical power continues, each click touch to turn off the light when the brightness will be memory, the next time you click touch lights will this brightness as the initial brightness. In case of power failure, the power on again after the first click touch lights, initial brightness brightness of 50% fixed for the whole.

  • The LED three touch light regulating function

  • After the initial power supply, turn off the lights for the state.

  • A per click touch, the brightness of the light brightness, brightness, low to high brightness to destroy cycle changes.

Sensitivity adjustment

The greater the capacitance, the higher the sensitivity, the smaller the capacitance value, the lower the sensitivity.

Adjust the touch sensitivity. See the table below

  • Direct touch of the metal housing polyester capacitor 333 0.033uF/25V

  • 3mm within 103 0.01uF/25V polyester acrylic glass capacitor

  • 3-6mm 203 0.02uF/25V polyester acrylic glass capacitor

  • 6-10mm 473 0.047uF/25V polyester acrylic glass capacitor

Note 

  • when the output of the constant voltage regulator is connected to the LED, the upper bound flow resistance must be connected!

  • Limiting resistance calculation method: R = (Vled - Vi) / Io

  • Among them, Vi is the input voltage, Vled is the total pressure drop of all LED lamps, Io is the total current of the lamp string. The floating range of Vled and Vi should be considered in the calculation. General battery full time Vi will be too large. LED after the heat up, Vled will fall! To prevent the current burned or lamp module.

Shipping list

  • LED touch tone module one (finished, has been tested, electrostatic bag packaging)

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