HOW to Build a Smart Trash Can (Manual Mode) with Kidspico

Flow

Assembly

Required:

Step 1

Step 2

Step 3

Step 4

① Hold the lid still to make it align with the hole.

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 io19 on the board and link the board to computer via USB cable.

Open Servo_Calibration.py and click .

'''
 * Filename    : Servo_Calibration
 * Thonny      : Thonny 4.1.4
 * Auther      : http//www.keyestudio.com
'''
from machine import Pin, PWM
import time

servo = PWM(Pin(19))
servo.freq(50)  #T = 1/f = 20ms

def angle(x):
    return int((((x + 45) * 1.8 / 270) + 0.6 )/ 20 *65535)

while True:   
    servo.duty_u16(angle(90))

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

Completed!

Wiring Diagram

Test Code

Open 4.4Smart bin_Manual mode.py and click .

'''
 * Filename    : Smart bin_Manual mode
 * Thonny      : Thonny 4.1.4
 * Auther      : http//www.keyestudio.com
'''
from machine import Pin,PWM
import time
from ROCKER import rocker

servo = PWM(Pin(19))
servo.freq(50)  #T = 1/f = 20ms

def angle(x):
    return int((((x + 45) * 1.8 / 270) + 0.6 )/ 20 *65535)

scl = Pin(5) 
sda = Pin(4)
bus = 0
snsr = rocker (bus, scl, sda)

while True:
    x,y,z = snsr.readXYZ()
    print('y:',y)
    time.sleep(0.1)
    if 0 <= y < 490:
        servo.duty_u16(angle(-45))
    else:
        servo.duty_u16(angle(90))

Explanation

• <=

  Comparison operator: less than or equal to, it determines whether the left value is less than or equal to the right, and then True or False will be returned.

Conceive:

1. Initialization: set the pins of IIC and servo, set the servo output frequency.

2. Loop:

   ① read the value of joystick in y-axis and refresh it every 0.1 seconds, and print it on Shell.

   ② determine whether the value in y-axis is within 0 to 490 (with the servo being calibrated, the trash can lid is closed at this time).

   • True: the servo rotates to -45° to open the lid.

   • False: the servo rotates to 90° to close the lid.