Finger touch switch module, capacitor induction, stepless adjustable PWM board, suitable for LED light dimming microcontroller
Functional characteristics
Touch Optical module can realize touch switch control and brightness adjustment of LED light. It has the following functional characteristics and advantages:
1. The brightness of the light can be adjusted as needed, with a wide selection range and simple and convenient operation.
2. The touch function can be realized under the isolation protection of media (such as glass, acrylic, plastic, ceramics, etc.), with high safety.
3. The application voltage range is wide, and can be freely selected between 2.4-4.5V.
4. The application circuit is simple, with fewer peripheral devices, convenient processing, and low cost.
5. Good resistance to power interference and mobile phone interference. EFT can reach above ± 2KV; In the case of close range and multi angle mobile phone interference, touch response sensitivity and reliability are not affected.
6. Installation: No direct contact with copper foil is required, and the light can be adjusted across 3mm or more acrylic glass or plastic.
7. Usage: Can control LED modules, light strips, and other products. Suitable for indoor desk lamps, LED lighting dimming, and DIY lamp dimming, the best accessory for modification.
8. Function: Single line touch, utilizing the principle of capacitive touch, with sensitive sensing touch. The default is LED touch stepless dimming function with switch function, dimming function, and brightness memory gradually dimming function. When turning on the light, it gradually turns on, and when turning off the light, it gradually dims, 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 stages of the LED light (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 2x3cm left to right. The built-in copper foil module on the board adheres one side of the copper foil to the shell side.
11. Usage
a) When touching (with a touch duration less than 550ms), the light can be controlled to turn on or off. Click and touch once, the light will turn on; Click and touch again, the light goes out. The initial brightness of lighting is fixed at 90% of full brightness.
b) Long press touch (touch duration greater than 550ms) can achieve stepless brightness adjustment of the light. Long press and hold the touch once, the brightness of the light gradually increases. When released, the brightness of the light stops at the corresponding brightness at the time of release. If long press and hold for more than 3 seconds, the brightness of the light will not change after reaching its maximum brightness; Press and hold the touch again, and the brightness of the light gradually decreases. When released, the brightness of the light stops at the corresponding brightness at the time of release. If the press and hold time exceeds 3 seconds, the brightness of the light will not change after reaching the minimum brightness
Transformation. This cycle.
12. Debugging tips
If there is an error trigger during debugging, or if it is not triggered, it may be caused by the following reasons:
a) Touch line too thick
b) Touch line too long
c) The copper skin is not large enough
d) Interference near the switch power supply terminal
e) Touch parameter C1 is unreasonable
Technical features:
TI touch input corresponds to LED light control output. There are four functions to choose from, which are input by T1 and T2 pins before power on
The state is determined by. The details are as follows:
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 gradual dimming
3. T1=1, T2=0 corresponds to: LED touch stepless dimming function with brightness memory gradual dimming
4. T1=0, T2=0 corresponds to the LED three segment touch dimming function
The LED touch stepless dimming function without brightness memory is as follows:
When initially powered on, the light is turned off.
When clicking and touching (with a touch duration less than 550ms), the light can be controlled to turn on or off. Click and touch once, the light will turn on; Click and touch again, the light goes out. This cycle. When the light is on or off, there is no brightness buffer. And the initial brightness of the lighting is fixed at 50% of the full brightness.
When long pressing and touching (with a touch duration greater than 550ms), stepless brightness adjustment of the light can be achieved. Long press and hold the touch once, the brightness of the light gradually increases. When released, the brightness of the light stops at the corresponding brightness at the time of release. If long press and hold for more than 3 seconds, the brightness of the light will not change after reaching its maximum brightness; Press and hold the touch again, and the brightness of the light gradually decreases. When released, the brightness of the light stops at the corresponding brightness at the time of release. If the press and hold time exceeds 3 seconds, the brightness of the light will not change after reaching its minimum brightness. This cycle.
△ Click touch and long press touch can be used freely at any time, and their functions are not interfered with or restricted.
◆ LED touch stepless dimming function without brightness memory for gradual brightness and gradual dimming is based on the LED touch stepless dimming function without brightness memory for sudden brightness and 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. 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 buffering effect of slow brightness change, It has the effect of protecting eyes and vision.
The LED touch stepless dimming function with brightness memory gradually dimming is an addition to the LED touch stepless dimming function without brightness memory gradually dimming. When the power supply is constantly on, the brightness of each touch to turn off the light will be memorized, and the next time the touch to turn on the light, this brightness will be used as the initial brightness. In the event of a power outage, the first touch to turn on the light after re powering on will fix the initial brightness to 50% of the full brightness.
When long pressing and touching (with a touch duration greater than 550ms), stepless brightness adjustment of the light can be achieved. Long press and hold the touch once, the brightness of the light gradually increases. When released, the brightness of the light stops at the corresponding brightness at the time of release. If long press and hold for more than 3 seconds, the brightness of the light will not change after reaching its maximum brightness; Press and hold the touch again, and the brightness of the light gradually decreases. When released, the brightness of the light stops at the corresponding brightness at the time of release. If the press and hold time exceeds 3 seconds, the brightness of the light will not change after reaching its minimum brightness. This cycle.
△ Click touch and long press touch can be used freely at any time, and their functions are not interfered with or restricted.
◆ LED touch stepless dimming function without brightness memory for gradual brightness and gradual dimming is based on the LED touch stepless dimming function without brightness memory for sudden brightness and 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. 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 buffering effect of slow brightness change, It has the effect of protecting eyes and vision.
The LED touch stepless dimming function with brightness memory gradually dimming is an addition to the LED touch stepless dimming function without brightness memory gradually dimming. When the power supply is constantly on, the brightness of each touch to turn off the light will be memorized, and the next time the touch to turn on the light, this brightness will be used as the initial brightness. In the event of a power outage, the first touch to turn on the light after re powering on will fix the initial brightness to 50% of the full brightness.
◆ LED three touch dimming function
When initially powered on, the light is turned off.
Each time you click on the touch, the brightness of the light changes in a cycle of low brightness, medium brightness, high brightness, and off.