![]() ![]() So, when the finger is placed on the touch sensor, Arduino UNO detects the change in the logic state of the sensor’s output and drive the bulb using Pulse Width Modulation (PWM). Since it is connected to Arduino UNO, we will detect this change in state i.e. Whenever we touch the sensitive part of the touch sensor, the SIG pin of the sensor goes HIGH. When the sensor is not touched, the SIG pin of the sensor remains LOW. The working of the project is explained here. In this project, a simple touch dimmer switch circuit is designed. Working of the Touch Dimmer Switch CircuitĪs mentioned earlier, there are many types of dimmer switches for different types of bulbs. This completes the design of the circuit. And finally, connect a bulb between the emitter and ground terminals. Then connect the collector terminal of the transistor to the 5V power supply. So, first connect the base of a transistor like 2N2222 to any digital I/O pin of Arduino UNO with the help of a current limiting resistor. The bulb is interface with the Arduino UNO board with the help of a transistor. Next, we will connect a small incandescent bulb that glows on DC. Here, it is connected to digital I/O pin 8. The SIG pin of the touch sensor is connected to any of the digital input / output pin of the Arduino UNO board. The touch sensor is given the power supply by connecting 5V to VCC and ground to GND pins. The design of the Touch Dimmer Switch Circuit is very simple and is explained here. How to Design Touch Dimmer Switch Circuit ? We will use this logic in the programming part of the Arduino. The output of the touch sensor will be logic HIGH when we place our finger on the touch plate. ![]() For additional information regarding the Touch Pad Detector IC and the circuit of the touch sensor, refer the datasheet of TTP223. This particular IC can detect 1 key touch and the sensor can be used as replacement for traditional button in a wide range of consumer products. The touch sensor used in this project is based on TTP223 Touch Pad Detector IC. Additionally, some sensors can detect these changes in capacitance without the physical contact but when the finger is placed slightly near to the sensor. The working of a touch sensor (Capacitive type to be specific) is simple.īasically, it detects the change in capacitance of the sensor when we touch it. The advantage of touch sensors is that with a single sensor, we can get multiple operations like swipe, tap and pinch. The most common one is the capacitive type touch sensor and we have used one in this project. There are different types of touch sensors like resistive touch sensors, capacitive touch sensors, piezo touch sensors etc. Hence, touch sensors are replacing buttons in devices like mobile phones and laptops. They are input devices like buttons and switches but are more sensitive than those two. Touch Sensor: A Touch Sensor is a type of sensor that detects physical touch or proximity.
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