Question

i need a design for a robot to be placed in swimming pools that detects drowning , in case drowning is detected it will automatically inflate an airbag to rescue the swimmer NOTE we need a design without using cameras and image processing the robot will be in the swimming pool

Answer 1

we need a feeback system to make the do this kind of task.

just like in ACs when temperature of room rises, the Ac will turn on itself and will work till the room temperatures returns to the temperature which is set by the user.

Just like this, we will have to set a parameter to be returned to the robot. to do this, we will need a microcontroller temperature sensor, ultrasonic sensor and a feedback system.

Now, you have mentioned that robot will be in the swimming pool. I don't know upto how much extent it is possible. But assuming the robot is placed in water and working without any malfunction,

first: when a person starts to drown the robot will not know since there is no image processing. so robot has to be dependent on the surroundings of the person being drowned. Now lets see the working of my idea.

the robot having ultrasonic sensor will continuously transmit EM waves with a certain frequency. when the person starts to splash the water, the frequency of the EM wave being received by the sensor will change and then the microcontroller will calculate the distance of victim from robot and will send it to the signalling port in the Board.

After this the robot mechanical function wlll start to work as per the programming done by the user to inflate the Air belt and save the person from drowning.

Hope it helps.