MICROMOUSE-T01 KIT

Wichit Sirichote, wichit.sirichote@gmail.com

Simple Micromouse KIT, UKMARSBOT platform, controlled with MEGA328 NANO board.

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This simple design micromouse is based on the UKMARSBOT platform. The controller is MEGA328 nano board. Motor driver board is TB6612FNG. This hardware version is modified from the original design by Peter Harrison, UKMARS.ORG The wall sensor has 3 directions: RIGHT, FRONT and LEFT. Wall detected indicators are added using three colors LED. The master reset button is also added. The robot is powered with two cells, series connected, 14500 Li-ion battery (+7.4V). The N20 motor with encoder is mounted on the PCB using the available holder directly. The software examples and test code are compatible with ukmarsbot.

Micromouse T01

Micromouse T01 features:

• UKMARSBOT Platform
• MEGA328 nano controller
• TB6612 motor driver
• IR wall sensors: Left, Front and Right
• N20 gear motor with magnetic encoder
• Wall detected indicator LED
• Master RESET button
• Two cells (+7.4V), 14500 Li-ion Battery power
• Optional HC06 Bluethoot interface

Mechnical specification:

• Main body: 86x99mm
• Wheel diameter: 34mm
• Ground clearance: 10mm
• Height (with battery): 50mm
• Weight: 90g (no battery), 150g (with Li-ion battery)
• Motor mounting nut: M2

Hardware schematic (click to enlarge)

Hardware: The wall sensors produce analog signal proportional to the amount of reflected IR wave. Three phototransistors for RIGHT, FRONT and LEFT directions are connected to the analog input A0,A1 A2. The IR emitter is switched ON by Q2 transistor. The wall detected indicators are. D10 for left wall, D9 for right wall and D2 for front wall. D10 is shared with bootloader LED on NANO board. During code downloading, it will blip at power on reset, or manually reset by SW3 pressed. D2 LED is shared with system tick indicator.

Power output to the motor is PWM signal driven by TB6612, dual channels H-bridge DC motor driver. The control signals for left and right motors are PWM, and direction. The encoder wheel is magnetic disc attached to the motor shaft. The HALL sensors detects motor revoluation, produing DC pulse to the interrupt pins of the 328 chip.

The function selector produces 16 voltage levels. This voltage signal is tied to analog input A6 pin. User can set 16 functions with four bit binary number from 0000 to 1111 for function 0 to 15 directly.

Nice design, PCB layout.

Robot Layout

 

REAR VIEW, Power switch, Start button, and Function select 0-F (0-15)

 

With Li-ion 14500 battery, +7.4V, placed on the battery frame.

Robot can connect terminal for program testing. The speed sets to 115200. Press START button the robot will send data stream for sensor readings, robot position, robot angle.

Terminal connected, 115200 speed, FUNC sets 0001, shows Left, Front ad Right sensor readings. (Left and Front detected!

 

Sensor test function 1 (0001): Left and Front walls are detected.

 

Sensor test function 1: Front and Right walls are detected.

 

Sensor test function 1: Left, Front and Right walls are detected.

 

DIY maze 4x4 (180mm cell size). Yellow LED shows Right wall detected.

The micromouse T01 is available on eBay in kit form.

Miromouse T01 Kit form

 

PARTS LIST Semiconductors U1 328NANO, MEGA328 NANO board, 16MHz U2,U4,U6 5mm phototransistor U3 TB6612FNG, 2-channel motor driver U5 74HC86, quad exclusive-OR gate D1 1N4148, Silicon signal diode D3 1N4733A, +5V zener diode D8 TVS15V, Transient Voltage Suppressor diode D2,D9,D10, 3mm LED D5,D6,D7, 5mm IR LED Q2 BC337, NPN general purpose transistor Resistors (all resistors are 1/8W +/-5%) R1,R2,R4,R10,R11,R17 1k R3,R9,R21 680 R6,R7,R8 100 R12,R14,R18,R20 10k R13 470 R15 4k7 R16 2k2 Capacitors C1 220uF, 16V Electrolytic capacitor C2,C3,C5,C6,C7 100nF, multilayer capacitor C4 470uF 16V Electrolytic capacitor Additional parts MG1 N20 gear motor with encoder MG2 N20 gear motor with encoder SW1 PUSHBUTTON-SPST SW2 DIP switch 4-position SW3 MASTER RESET button SW4 Slide switch power ON/OFF JP1 4 pins header for HC-06 Bluetooth MODEM (optional) J1,J2 CON6, female 6-pin header J3 CON2, Battery socket K1,K2 Fixed Wheel LS1 BATTERY FRAME PCB double layer printed circuit board M2 motor holding nut x2 M2 Nylon tube 15mm x4

Micromouse T01 Kit is available on eBay. Bitcoin or PayPal are also accepted.

Download:

Assembly Manual, rev1.0 December 2022
Schematic , BOM , Test code for T01 Bot , Quick Start

Technical information:

Software example UKMARSBOT at github

More technical information, please contact Wichit Sirichote, wichit.sirichote@gmail.com

 

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Last updated November 3, 2022