Thames & Kosmos Robotics Workshop: Sensor Expansion Pack handleiding

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Robotics Workshop

ROBOTIC COMPONENTS

Color sensor: The color of an object is determined by the

proportion of light colors reflected by the object. A color

sensor determines the color of an object by detecting the

reflected red (R), green (G), and blue (B) wavelengths of

light that are reflected by the object.

Scan the QR for help getting started

with the color sensor.

Infrared sensor: This kit includes two active infrared

sensors, which emit an infrared light. When obstructed

by an object, this light is reflected back to the sensor. The

receiver detects the reflected infrared light to determine if

there is an obstruction.

Scan the QR for help getting started

with the infrared sensor.

Toggle sensor: The toggle sensor functions similarly

to a button, transmitting a digital signal to the brain

(micro:bit) upon being pressed or released. It can

convey two types of signals to the brain: 1 or 0.

Scan the QR for help getting started

with the toggle sensor.

RGB LED: Also known as a multi-color light emitting

diode, this output device emits lights of various colors by

combining the primary colors of light: R (red), G (green),

and B (blue) in certain proportions.

Scan the QR for help getting started

with the RGB LED.

1cm~2cm

Principle of Infrared Sensors

- Infrared sensors primarily come in two types:

active and passive. Here we use an active infrared

sensor.

- Active infrared sensors emit an infrared light,

which, when obstructed by an object, reflects back.

The receiver detects the reflected infrared light to

determine if there is an obstruction.

Detection Range

For optimal performance, it's recommended to

place the infrared sensor toward the surface or the

trigger object within the range of 1 to 2 cm for

emitting and receiving infrared light.

Note:

The detection sensitivity has already been adjusted to optimal

settings, so there's no need to adjust it unless for special purposes.

emitted

infrared light

digital coding block

analog coding block

reflected

infrared light

Switching between Digital and Analog Signals

The sensor features a D/A switch on the back. Digital signals are commonly used, and all

models in this package utilize Digital mode for their applications.

Adjustable Rotary Knob on the Back (for Digital Mode Only)

There is a hole on the back of the sensor, allowing adjustment of the sensitivity for detecting

Digital signals using a screwdriver.

Infrared Sensor Introduction for Students

D (Digital) mode

programming involves distinguishing

between 0 and 1, representing presence

and absence, respectively.

A (Analog) mode

finer signal variations within the range of

0 to 1023 can be detected.

Note:

If you want to use Analog mode, please

only connect to analog channel, pin 1, 2, 0.

Principle of Toggle Sensor

- The toggle sensor functions similarly to a

button. transmitting a digital signal to the

brain (micro:bit) upon being pressed or

released. It can convey two types of signals to

the brain: 1 or 0.

- In the case of this toggle sensor, releasing it

sends a signal of 1, while pressing it sends a

signal of 0.

Every time you release it, the status

becomes 1 again, and the LED

matrix will clear the screen.

Locking Mechanism of Toggle Sensor

This Toggle sensor is equipped with a locking

mechanism. By pressing and slightly rotating

it clockwise, the button can be locked to

continuously send the signal 0.

Practice

The toggle sensor distinguishes status through potential switching. To initiate the program,

you need to inform the brain (micro:bit) that the initial potential status of the toggle sensor

is pulled up. Once the toggle sensor is pressed, the potential becomes down, allowing the

micro:bit to detect the status change.

Toggle Sensor Introduction for Students

On start, set the toggle sensor to the up position.

Released

sends signal 1

press, rotate, and lock

Every time you press it, the status

becomes 0, and the LED matrix will

display a smiley face.

Therefore, for the program practice mentioned above, if you wish for the LED matrix to

continuously display the smiley face, you can utilize the locking mechanism to maintain the

button in the signal 0 state.

Pressed

sends signal 0

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