SG90 Servo Motor (180°)

import servo	# Controls the servo motor
import time	# Controls pauses and timing

# Commands the 180 degree servo connected to pin 26
# pin26 corresponds to D2 on the Sensor Shield V5.0

print("The arm wakes up...")	# The announcement
servo.servo180_angle(26, 0)	# Command the arm to 0 degrees (one end)
print("Angle: 0")	# Narrate the position
time.sleep(1)	# Hold there one second
servo.servo180_angle(26, 90)	# Command the middle
print("Angle: 90")	# Narrate
time.sleep(1)	# Hold one second
servo.servo180_angle(26, 180)	# Command the other end
print("Angle: 180")	# Narrate
time.sleep(1)	# Hold one second
servo.servo180_angle(26, 90)	# Return to rest in the middle
print("At rest in the middle.")	# The calm ending

💡 Note: three commands, three positions but here is the experiment that matters: while the arm holds at 90°, gently push it with your finger. It resists and returns! A TT motor could never do that it has no idea where "90" is. Also try to move the arm by hand with the board disconnected: it moves freely. The servo only rules when the brain is powered.

import servo	# Controls the servo motor
import time	# Controls pauses and timing

# Commands the 180 degree servo connected to pin 26
# pin26 corresponds to D2 on the Sensor Shield V5.0

print("The sweep begins...")	# The show starts
for angle in range(0, 181, 10):	# angle climbs: 0, 10, 20 ... 180
    servo.servo180_angle(26, angle)	# Move to the current angle
    time.sleep_ms(120)	# Small pause between steps
print("Top reached now back down")	# Narrate the turn
for angle in range(180, -1, -10):	# angle DESCENDS: 180, 170 ... 0
    servo.servo180_angle(26, angle)	# Move to the current angle
    time.sleep_ms(120)	# Small pause between steps
print("Sweep complete.")	# The ending

💡 Note: the second loop's secret is the third number: -10 makes range count BACKWARDS 180, 170, 160... down to 0. You met backward counting in the siren (Module 4); now it moves a real arm. Try changing the step from 10 to 2: the sweep becomes silky but takes twice as long. Smoothness costs time every animation in this course has traded one for the other.

import servo	# Controls the servo motor
import time	# Controls pauses and timing

# Commands the 180 degree servo connected to pin 26
# pin26 corresponds to D2 on the Sensor Shield V5.0

print("Slow version: 0 to 90 in tiny steps")	# The first style
for angle in range(0, 91, 5):	# Tiny steps of 5 degrees
    servo.servo180_angle(26, angle)	# Move
    time.sleep_ms(150)	# Long, lazy pauses
print("Arrived slowly. Now the fast version!")	# Narrate the change
servo.servo180_angle(26, 0)	# Jump back to the start instantly
time.sleep(1)	# One second to prepare
servo.servo180_angle(26, 90)	# ONE command: the whole trip at once!
print("Arrived instantly.")	# The contrast is the lesson
time.sleep(1)	# Pause
angle = servo.servo180_angle(26)	# ASK the servo which angle it holds
print("The servo reports its angle:", angle)	# Show its memory

💡 Note: two ways to be "slow" and one way to be instant and all three are just choices of steps and waits. The last two lines are new: the getter servo.servo180_angle(26) (one argument instead of two) asks instead of commands it returns the angle the program last ordered. Inside the real servo, a sensor physically enforces that position; in your program, the library remembers it. Command and ask every device in Level 2 will offer you both doors.

import servo	# Controls the servo motor
import time	# Controls pauses and timing

# Commands the 180 degree servo connected to pin 26
# pin26 corresponds to D2 on the Sensor Shield V5.0

print("The robot greets you!")	# The scene opens
servo.servo180_angle(26, 90)	# Neutral position first
time.sleep(1)	# A moment of preparation
for wave in range(1, 4, 1):	# Three waves
    print("Wave", wave)	# Count each one
    servo.servo180_angle(26, 45)	# Tilt to one side
    time.sleep_ms(400)	# Hold the pose briefly
    servo.servo180_angle(26, 135)	# Tilt to the other side
    time.sleep_ms(400)	# Hold again
servo.servo180_angle(26, 90)	# Back to neutral before the bow
time.sleep_ms(500)	# A dramatic pause
print("...and now, a deep bow.")	# Narrate the ceremony
servo.servo180_angle(26, 10)	# The bow: almost to the table
time.sleep(1)	# Hold the bow one full second
servo.servo180_angle(26, 90)	# Rise back up
print("It is an honor to meet you.")	# The closing line

💡 Note: 45°–135° is a comfortable wave zone; 10° is the bow. These poses are design decisions, not math you chose them by feel, like a choreographer. Notice how the arm robot feels alive with zero new commands: only angles, waits and order. Give your arm a name and a personality teams with named robots care more, and caring is half of learning.

import servo	# Controls the servo motor
import time	# Controls pauses and timing

# Commands the 180 degree servo connected to pin 26
# pin26 corresponds to D2 on the Sensor Shield V5.0

print("=== OBEDIENT ARM ===")	# The mission title
print("Type an angle from 0 to 180 (EXIT quits)")	# The menu
commands = 0	# Counts the orders the arm has served
while True:	# Serve forever
    text = input("Angle: ")	# Wait for your typed text
    if text == "EXIT":	# The quit command
        servo.servo180_angle(26, 90)	# SAFETY: return the arm to rest first
        print("Arm at rest. Orders served:", commands)	# The shift report
        break	# Leave the loop
    angle = int(text)	# NEW: convert the typed TEXT into a whole NUMBER
    if angle < 0 or angle > 180:	# Outside the servo's range?
        print("Refused:", angle, "is not between 0 and 180")	# The polite refusal
    else:	# A valid angle
        servo.servo180_angle(26, angle)	# Move the arm there
        commands += 1	# One more order served
        print("Arm moved to", angle, "degrees")	# Confirm

Serial Monitor: 

=== OBEDIENT ARM === 

Type an angle from 0 to 180 (EXIT quits) 

Angle: 45 

Arm moved to 45 degrees 

Angle: 200 

Refused: 200 is not between 0 and 180 

Angle: 180 

Arm moved to 180 degrees 

Angle: EXIT 

Arm at rest. Orders served: 2 

💡 Note: two firsts live here. ① int(text) the Text-to-Number block: input() always hands you TEXT, even if you typed digits; int() translates "45" into the number 45. Now you can do math on what humans type. ② Validation: the guard angle < 0 or angle > 180 checks the command BEFORE obeying a program that refuses impossible orders is a safe program. Detective experiment: type banana instead of a number and watch the program crash! Turning text into numbers can fail handling that failure gracefully is a Level 2 skill; for now, know that it exists and that real engineers plan for it.