Rescuing Victims

IR Sensor's are on the side of our robots arm to detect victims , when it caught the victims , it should understand that the victim is dead or alive , as the alive victims are conductive , we covered our grippers in alumimium foil and connected one of them to data and the other one to GND this will act like a key.

To Separate our victims our separator and gripper moves.

And for finding the red and green evacuation zone we used three OpenMV cameras to detect them. when our robots two front microswitches hits , it would detect a wall or evacuation zone and we should separate them using its ultrasonic , if its distance was more than a certain amount it will detect the evacuation zone.

When it detected the evacuation zone now it should know that witch evacuation zone is that , red or green. For detecting them it raises its arm so it can detect the type of evacuation zone, because the OpenMV camera is under its arm.

Our robot holds the victims witch it shouldn't drop using its separator so it can rescue all of the victims successfully and it raises its box and drops the victims.

Comments

Obstacle

we recognize the obstacle with the distance meter (ultrasonic) or the microswitch that is in front of the robot, after the detection: If the robot detects the obstacle with the distance meter it will: 1-goes backward , 2-turns 90 degrees , 3-goes straight for a bit , 4-turns 45 degrees If the robot detects the obstacle with its microswitch's it will: 1- if the left microswitch hits the obstacle it will goes leftward until the distance meter sensor detects the obstacle. 2- if the right microswitch hits the obstacle it will goes rightward until the distance meter sensor detects the obstacle.

OpenMV

We used OpenMV camera to detect the two type of evacuation zones , green and red , when our robot detects the Evacuation Zone , it goes backward a little so it can raise its arm so its OpenMV can see a good amount of the evacuation zones color. For recognizing colors we made four color ranges and named them "LAB", two for green and two for red. one of them is for shadow light environment , and the other is for normal light environment, so it can detect the color correctly in any conditions. When our robot detects the Evacuation Zone it try's all of the four color ranges to understand witch Evacuation Zone it is. also we set them in a way that in any light environment they work. As we said in the OpenMV Electronic Blog our connector witch we used to connect OpenMV to our Sensor Board has three digital pins , so it will have eight different modes (2³) but we only used three of them , Red , Green , and nothing.

Ramp

We used some functions and variables for ramp detection such as: Two line following function on the uphill and downhill with a important variable named "time slow". Robot will detect the ramp using gyroscope , if its angel is above or equal 25 degrees it will detect the ramp and it will lower it arms and boosts itself and also it will speed up, after going trough the ramp when its angel is zero degrees it will lower its speed and goes back to the normal mode. and because after any uphill ramp a downhill ramp exists with using time slow variable it will lower its line following speed so it can go down form a downward ramp correctly. Also our wheels helps our robot to go up the ramp using double friction.

Pishnam Programming