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Covid or Touch less Trolley for Kids

Fifth Project for the course of robotics and iot
In this Project the kids will understand the working of

sensors, relay module and motors.

sensors

The sensor convert stimuli as light, heat, sound , pressure, motion into electrical signals. These signals are converted into the binary code. Now writing a program this binary signal in the form of one or zero is used for doing different tasks . In robotics almost every sensor has four connections. Two connections are inputs for supply plus and minus voltage and the other two are digital and analog output.

Now with our programming depending upon the output, we receive from the sensors, we switch on/off the required items There are different sensors some of them are

IR Sensor

It gives binary code by variation of infrared rays

Temperature sensor

It gives Digital/Analog signal with temperature variation

Light Sensor

Give Digital/Analog signal with variation of light

Pressure Sensor

Give Digital/Analog signal with variation of pressure

Force sensor

Give Digital/Analog signal with variation of Force

Ultrasonic sensor

Works by sending a sound wave, time of sending and returning the wave is known, distance of the object can be found.

Smoke sensor

Give Digital/Analog signal with variation of Force

Gas Sensor

Give Digital/Analog signal with variation of Force

Alcohol Sensor

Give Digital/Analog signal with variation of amount of alcohol. Give Digital/Analog signal with variation of amount of humidity

Motion Sensor

Give Digital/Analog signal with variation of motion.

Tilt Sensor

Give Digital/Analog signal with variation of angle movement.

Color sensor

Give Digital/Analog signal with variation of RGB colours.

Touch sensor

Give Digital signal with touch.

Proximity sensor

Give Digital signal by detecting presence of an object.

level sensor

Give Digital signal within a specified range and determine the exact amount of substance

Acelerometer Sensor

Give Digital/Analog signal with of acccelration. Vision and imaging sensor Give Digital/Analog Signal with the variation of electrons of the image received

Radiation Sensor

Give Digital/Analog Signal with the variation of amount of radiation

Position sensor

Transmitted light gives the Digital/Analog signal in according to received light

Photo Electric Sensor

Give Digital/Analog signal with variation of light. In this touch less trolley one relay module is used How the Relay Module Works Relay module has three connections. Two connections are for power supply , one for positive and other for the ground. The third connection gets zero or one according to the output received from the sensor. This relay will work as a switch for the motors of the trolley. If some object comes in front of the trolley, the digital signal received from the sensor will be zero, this will switch of the motor of the trolley. Hence the trolley will stop.