TTP224 4-Channel Capacitive Touch Sensor/Switch ModuleThis is a capacitive touch sensor module with 4 channels. It's perfect for adding capacitive touch inputs to any project. It can accurately detect up to 4 points. This keypad can also be used in place of a mechanical keypad. To check the status of each pressed key, four status LED SMD types are provided. The TTP 224 IC offers a capacitive sense input feed designed for touchpad control, pursued by a 4 finger sized touchpad, and is a 4 Switch digital

They help in providing safe removal and insertion of IC chips

The ESP32 board has a D1 Mini profile

or you can connect it directly to the microcontroller you're using

Program Memory Size

These are Carbon Film Resistor with a value of 33 ohm 1/4W and tolerance of ±5%

Input Voltage 90-220V AC Maximum Power 2000W Adjustable voltage 50-220V AC

It also has a low self-heating property

LDR provides high resistance of several Mega Ohm in the absence of light but as the light starts striking on its surface the resistance offered by the LDR gradually decreases to a few Ohm

It is one half of the LM324 Quad op-amp

Model MQ-3 Type Gas Sensor No

The inputs are ground referenced while the output automatically biases to one-half the supply voltage

S Product Flat Rectangle Red LED LED Colour Red Lens Colour Red Forward Voltage 2