Kids OK with adultESP32Level 2/3
Tea-Serving Robot
Pick a desk on your phone. The robot follows a black tape line and stops at that desk with your tea.
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Kids OK, with an adult
DIY project. Children must build this only with an adult (16+ years) beside them at all times. Not suitable for children under 8 years.
An adult must handle and charge the lithium (18650) batteries.
Strictly follow the description given with this video.
Video
The video link will be added here soon.
How it works
- Three IR sensors under the robot see the black tape line (left, centre, right).
- The ESP32 steers: if the line drifts left, it slows the left motor, and the same for the right.
- White stop marks across the line are counted. At the chosen desk number, the robot stops.
- The L298N driver gives the motors the battery power that the ESP32 pins cannot give.
Parts you need
ESP32 dev board₹518× 1Buy- 3-channel IR line sensor (TCRT5000)× 1Buy
L298N motor driver₹161× 1Buy
2× N20 6V gear motors + wheels× 2Buy
Ball caster₹46× 1Buy
2× 18650 battery pack (7.4V) + ON/OFF switch× 2Buy
Kit for this projectPrice on request
Get the kitWiring
PowerGroundSignal
| # | From | Connect to |
|---|---|---|
| 1 Power | IR sensor VCC | ESP32 3V3 |
| 2 Ground | IR sensor GND | ESP32 GND |
| 3 Signal | IR sensor L | ESP32 D5 |
| 4 Signal | IR sensor C | ESP32 D18 |
| 5 Signal | IR sensor R | ESP32 D19 |
| 6 Signal | L298N ENA | ESP32 D14 |
| 7 Signal | L298N IN1 | ESP32 D27 |
| 8 Signal | L298N IN2 | ESP32 D26 |
| 9 Signal | L298N IN3 | ESP32 D25 |
| 10 Signal | L298N IN4 | ESP32 D33 |
| 11 Signal | L298N ENB | ESP32 D32 |
| 12 Signal | L298N 5V out | ESP32 VIN |
| 13 Ground | L298N GND | ESP32 GND |
| 14 Signal | Left motor | L298N OUT1 / OUT2 |
| 15 Signal | Right motor | L298N OUT3 / OUT4 |
| 16 Power | Battery + | Switch → L298N 12V |
| 17 Ground | Battery − | L298N GND |
3D print files
- robot_chassis.stlPETG · 0.2 mm · no supportsLink at launch
- cup_tray.stlPETG · 0.2 mm · no supportsLink at launch
Code
The tested Arduino / ESP32 code for this project will be posted here, ready to copy.