THE POOL OF TEARS: Alice crying

Programming level 1

Build Alice’s head.
Build a carriage with a DC motor that pushes the crying Alice's head forward, which pushes the tears (mini cubes) in front of it into the puddle.
The carriage runs on drive reails with gears.
The program starts automatically when the power is turned on.

Head

Build Alice’s head and the carriage like in P1.
Attach 1 Sound sensor, 1 Buzzer, 2 white LEDs.
The program starts on Sound sensor.
The head moved by DC motor goes forward for a measured time (as long as the rail lasts) and pushes the "tears" into the pond. It stops at the end of the track.
While the robot is moving, the LEDs blink and when the robot stops, the Buzzer sounds.

Head

Build Alice's head and the gear-driverail structure based on the sample, with the tears being "pushed" out through Alice's eyes by the DC motorised structure.
Connect 2 Touch sensors, Buzzer and 2 LEDs.
The program starts when one of the Touch sensors is pushed.
The DC motor stops, the LEDs start flashing and the Buzzer sounds, confirming the crying when the other Touch sensor is pushed.

Head

Build a robot as in P3
Connect 2 IR Photoreflectors, 1 Touch sensor,1 Buzzer and 2 LEDs.
One IR Photoreflector is on the front of the robot, when it detects a change, the DC motor starts to operate and the structure starts to push the "tears" forward.
When the Touch sensor on the back of the head is pushed in (the carriage reaches the head), the DC motor stops, then the Buzzer is switched on and the LEDs start blinking.
The carriage then moves backwards until it is sensed by another IR Photoreflector at the end of the track. The robot will then stop.
This process can be repeated several times in a loop.