Capacitive Touch Switches, 10pcs TTP223B Modules, for Raspberry Pi EVC-702 7 Screen

The project scope includes the completion of touch fluorescent lamps and other smart home projects using an optocoupler and a bi-directional thyristor. Additionally, the optocoupler, delay, and bi-directional thyristor can be utilized to create touch-sensitive lamps for stairs.

The features of this module include low power consumption and a power supply range of 2 to 5.5VDC. It can replace traditional touch buttons, and it has four M2 screw positioning holes for easy installation.

Regarding the specifications, the power supply voltage (VCC) ranges from 2.0 to 5.5V, with a typical value of 3V. The output high (VOH) is 0.8VCC, and the output low (VOL) is 0.3VCC. The output pin sink current (at VCC = 3V, VOL = 0.6V) is 8mA, and the output pin pull-up current (at VCC = 3V, VOH = 2.4V) is 4mA. The response time in low-power mode is 220ms, and the response time in touch mode is 60ms. The module's dimensions are 24x24x7.2mm, and it weighs 2g.

The package includes 10 TTP223B switch modules, which are digital touch sensors of the "momentary" variety. This means that the module turns on when touched and turns off when released, allowing the positive and negative terminals to be used as a touch surface, replacing traditional touch buttons.

The four M2 screw positioning holes facilitate easy installation on non-metallic surfaces, such as plastic or glass. Furthermore, the module can be hidden in walls, desktops, and other parts, as long as a thin, non-metallic paper covers the surface.

The module is based on the TTP223B touch-sensing IC, a capacitive touch switch module. In the normal state, the module output is low, and the power consumption is low. When a finger touches the corresponding position, the module output becomes high. If no touch is detected for 12 seconds, the module switches to low-power mode.

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