3.6 Follow Your Hand 2¶
In the 3.4 Follow Your Hand project only the ultrasonic module is used, it can only follow your hand forward.
In this project, we use 2 IR obstacle avoidance modules at the same time, so that the car can follow your hand left or right.
Required Components¶
In this project, we need the following components.
It’s definitely convenient to buy a whole kit, here’s the link:
Name |
ITEMS IN THIS KIT |
LINK |
|---|---|---|
3 in 1 Starter Kit |
380+ |
You can also buy them separately from the links below.
COMPONENT INTRODUCTION |
PURCHASE LINK |
|---|---|
- |
|
Build the Circuit¶
Connect the ultrasonic module and the two IR obstacle avoidance modules at the same time.
The wiring between the ultrasonic and the R3 board is as follows.
Ultrasonic Module |
R3 Board |
Vcc |
5V |
Trig |
3 |
Echo |
4 |
Gnd |
GND |
The wiring of the 2 IR obstacle avoidance modules to the R3 board is as follows.
Left IR Module |
R3 Board |
OUT |
8 |
GND |
GND |
VCC |
5V |
Right IR Module |
R3 Board |
OUT |
7 |
GND |
GND |
VCC |
5V |
Programming¶
The effect to be achieved by this project is as follows
Ultrasonic detects your hand about 5-10cm in front and let the car follow.
The infrared module on the left detects your hand and turns to the left.
The right IR module detects your hand and turns to the right.
1. Create a block
Create blocks that allow the car to move forward, turn left, turn right and stop.
2. Follow to move forward
Read the ultrasonic value and if your hand is detected at a distance of 5-10cm, then let the car follow.
3. Follow to turn left and right
Read the values of the left and right IR modules.
If the left IR module detects your hand, turn left.
If the right IR module detects your hand, turn right.
If neither IR module and ultrasonic module detect your hand, make the car stop.
