HOW to Build a Smart Trash Can (Automatic Mode) with KidsIOT

Flow

Assembly

Required:

Step 1 to 10 are the same as those in 4.4, so you can directly use the form in 4.4 here.

① Remove the joystick.

② mount from step 11.

Yet if you have not assemble the building blocks in 4.4, please start from step 1.

Step 1

Step 2

Step 3

Step 4

① Hold with your fingers.

② Insert the rod.

ATTENTION: keep the lid flatwise.

Step 5

Step 6

Step 7

Step 8

Step 9

Step 10

The servo need to be calibrated before using. Connect the servo to pin io33 on the board and link the board to computer via USB cable.

Open KidsBlock and connect to the board, click File –> Load from your computer.

Choose D:\Code\2.Code_kidsIOT to open Servo_Calibration.sb3

Click  to connect to port and  the code.

After calibration, disconnect the board to computer and continue to mount.

ATTENTION: During mounting, please hold and keep the lid flatwise.

Step 11

Step 12

Step 13

Step 14

Completed!

Wiring Diagram

Test Code

Open KidsBlock and connect to the board, click File –> Load from your computer.

Choose D:\Code\2.Code_kidsIOT to open 4.5Smart bin_Automatic mode.sb3

Click  to connect to port and then .

Explanation

Code Blocks

Conceive:

1. Initialization

   Set the pins of obstacle avoidance sensor, buzzer and servo.

   

2. Main Code

   Loop: Determine whether the read value equals 0.

   • If it is 0, i.e., the sensor detects obstacles, the buzzer will receive a high level so then emit sound. At this time, the servo rotates to 45° to open the lid.

   • If it is not 0, i.e., the sensor detects nothing, the buzzer will not alarm. At this time, the servo rotates to 180° to close the lid.

   

   

   Q ： Function of the DELAY block?

   When the obstacle is leaving the sensing range, the lid will immediately close without delay. Thus, we add a delay time to maintain the state of the lid.

   A ： Delay is used to maintain the state of the lid, which can be modified according to your needs.

   

Test Result

After uploading code, we first need to adjust the obstacle avoidance sensor (please see chapter 3.5 for details).

After adjusting, place something in the sensing range in front of the obstacle avoidance sensor.

When the obstacle avoidance sensor detects it, the buzzer makes a sound, and the servo rotates to open the lid; When the thing leaves the sensing range, the sensor detects nothing, and the buzzer stops alarming, and the servo rotates to close the lid.