2 layers150 × 100 mm
Maze kiCad
billtsol/Maze
This project demonstrates how to use an Arduino board, IR sensors, and a motor driver shield to create a maze-solving robot.
39 parts2
2 layers191 × 151 mm
Follow The Line
billtsol/Follow-The-Line1This project is an example of how to use an Arduino board, QTR reflectance sensor, and a motor driver shield to create a simple follow-the-line robot.
- Size
- 191 × 151 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 40
- Pads
- 111
- Tracks, vias
- 400, 46
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 28 Mar 2023
- Updated
- 20 Aug 2024
Overview
Follow The Line is an open-source printed circuit board by billtsol, from the billtsol/Follow-The-Line repository on GitHub. It is a 2-layer board of 191 × 151 mm with 23 parts on 40 nets, routed with 400 tracks and 46 vias.
It is built around the DRV8835DSS, L7805 and RB141C1100. Its parts include 8 connectors, 2 resistors, 2 ICs and 1 switch. It belongs with the robots and motor control boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
3
DRV8835DSS
WSON-12-EP(2x3)-40℃~+150℃ 1.5A 2 2V~7V 305mΩ 95nA Yes WSON-12-EP(2x3) Brushed DC Motor Drivers ROHSTexas InstrumentsStepper Motor Driver
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsRB141C1100
-Rocker SwitchesE-Switch
README
README.mdArduino Follow-the-Line Project with QTR Reflectance Sensor
This project is an example of how to use an Arduino board, QTR reflectance sensor, and a motor driver shield to create a simple follow-the-line robot.
Requirements
To build this project, you will need the following components:
- Arduino board
- QTR reflectance sensor
- Motor driver shield
- Wheels
- Motors
- Jumper wires
- Battery
Circuit Diagram
PCB
Code
The code for this project is available in the follow_the_line.ino file.
You can also open the qtr_xA_example.ino file that includes an example of how to use the QTR reflectance sensor as an analog sensor to detect the position of a line.
Installation
- Download the Arduino IDE from the official website and install it on your computer.
- Connect your Arduino board to your computer via USB cable.
- Open the Arduino IDE and open the
follow_the_line.inofile. - Upload the code to your Arduino board by clicking the "Upload" button in the IDE.
Usage
- Connect the QTR reflectance sensor and the motor driver shield to your Arduino board according to the circuit diagram.
- Attach the wheels and motors to the chassis.
- Connect the motors to the motor driver shield.
- Connect the battery to the motor driver shield.
- Turn on the power and place the robot on a black line on a white background.
- The robot will follow the line until it reaches the end of the line.
Troubleshooting
If the robot does not follow the line correctly, you may need to adjust the threshold values in the code or adjust the position of the QTR reflectance sensor.
Feature thoughts for this project:
-
Add some LEDs to make the car follow the line in the dark: By adding some LEDs to the front of the robot, it can detect the line even in low light conditions. The LEDs can be programmed to turn on when the QTR sensor detects the line and turn off when it doesn't. This feature can improve the robot's performance in darker environments.
-
Add some obstacle sensors to avoid objects in line: By adding some obstacle sensors to the sides of the robot, it can detect if there are any obstacles in its path and avoid them while staying on the line. This feature can improve the safety of the robot and prevent it from crashing into objects while following the line.
Final Images
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | , , , , , | ||
| 6 | Socket_02 | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J1, J2, J3, J5, J6, J18 |
| 2 | 1kΩ | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2 |
| 2 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | A6, A7 |
| 1 | Arduino_Nano_Every | Module:Arduino_Nano | A1 |
| 1 | Array Reflectance Sensor | QTRX-13RC:QTRX-13RC | U2 |
| 1 | DRV8835 | Library:DRV8835 | MotorDriver1 |
| 1 | L7805 | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | U3 |
| 1 | RB141C1100 | RB141C1100:SW_RB141C1100 | S1 |
| 1 | Screw_Terminal | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-2-2.54_1x02_P2.54mm_Horizontal | J4 |
| 1 | Socket_04 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J9 |
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Questions
How big is the Follow The Line PCB?
It measures 191 × 151 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Follow The Line use?
23 parts, built around the DRV8835DSS, L7805 and RB141C1100. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Follow The Line KiCad files?
From the billtsol/Follow-The-Line repository on GitHub, at the commit this page was made from: the board is FollowTheLine_kiCad/FollowTheLine.kicad_pcb and its schematic FollowTheLine_kiCad/FollowTheLine.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Follow The Line design in my own project?
Its repository states no licence, so its author keeps all rights: ask billtsol before reusing the design.