Page 118 - TCS ICT Book 8

The City School 2021-2022

In the code, we are instructing the Pi to start the wave at 24% using the start command.

Then we use the command ChangeDutyCycle() which understands the value in
percentage format, referring to the on-time of signal or to change the angle. We just

have to input the percentage of on-time signal to rotate servo motor to a particular
angle. This is the standard method to program a servo motor.

The ChangeDutyCycle() is in while True loop which means that the servo motor will
keep changing its angle after a particular time.

5.14. Building Smart Robotic Car

Bumble Pi is an educational robot kit

specially designed for beginners to learn and

get hands-on experience with mechanics,
electronics, and Computer Science. Bumble
Pi is easy to assemble. Follow the step-wise

instruction for making Bumble Pi.

Equipment needed

• Raspberry Pi (with Raspbian OS)
• Pi Shield

• Screw Set
• Chassis (Upper and lower planks

and side planks)
• Battery with a zip tie

• DC Motors Chassis (upper and lower planks) DC Motors
• SONAR with Holder

• Servo Motor
• Wheels & Caster Wheel

• Android Mobile Device with
TechTree Bumble Pi Application

installed in it.

Wheels for DC Motor Caster wheel for the front

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