User Manual

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Project 6 : Smart Guard

Diculty Level

Part List

Description

6. Smart Guard

The ultrasonic ranger is able to detect

distance. In this demo, we will use the

ultrasonic ranger to detect if the is too

close. If something is too close the micro:bit

will show a sad face on it.

Note： This project requires high input

voltage, please use the Grove Shield for

micro:bit to power the circuit.

1x Grove - Ultrasonic Ranger

1x Grove Shield for micro:bit

1x micro:bit

Steps

Add basic block forever, then add logic block

if…then…else…

2. For condition ‘if’, add logic block 0≥0

5. For “else”, add basic block show icon, choose the

‘sad face’ icon.

6. Add basic blocks pause (ms) (100).

7. Hardware connection. Connect the Grove – Ultrasonic Sensor to P0 port of Grove shield for micro:bit.

8. Click Download to transfer your code in your micro:bit.

9. Move your hand up and down in front of the Ultrasonic Sensor, when your hand is less than 10cm close to the sensor, the micro:bit will

show sad face.

Try to change the warning distance or the warning icon. You may also place

this smart guardian on your favorite toy to protect it! protect it.

3. If you have added the Grove Package successful-

ly, replace the left ‘0’ with Grove block Ultrasonic

Sensor (in cm) at P0. Change another “0” to “10”.

4. For ‘then’, add basic block show icon, choose the

‘happy face’ icon.

P0/P14