Main 3.1
About the Main 3.1 PCB
Main 3.1 is an open source AVR/Arduino PCB design by hughminhphan, published on GitHub. It is a 2-layer board measuring 3.2 × 3.2 mm, with 65 components from 41 distinct parts.
Its main chip is the Arduino Compatible DC-DC Boost Module with Display, from the AVR/Arduino family. Other key parts include the TB67H420FTG Dual/Single Motor Driver Carrier, DEV-16771, Adafruit_BNO055_STEMMA_QT, Bluetooth_Module_(HC-05) and Bluetooth_Module_(HC-06). By type, the board carries 20 connectors, 16 ICs, 16 resistors, 9 capacitors, 2 transistors and 2 diodes.
From the project
My projects
Main components on the Main 3.1
Main 3.1 bill of materials (BOM)
65 components, 41 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ~ | Pololu 3.3V, 500mA Step-Down Voltage Regulator D24V5F3 | U1 |
| 1 | ~ | DC-DC Multi-output Buck Converter | U2 |
| 4 | ~ | SW_Cherry_MX_3mmLED | U3, U10, U11, U12 |
| 4 | TB67H420FTG Dual/Single Motor Driver Carrier | TB67H420FTG DualSingle Motor Driver Carrier | U4, U5, U6, U7 |
| 1 | DEV-16771 | MODULE_DEV-16771 | U8 |
| 1 | Arduino Compatible DC-DC Boost Module with Display | Arduino Compatible DC-DC Boost Module with Display | U9 |
| 1 | Adafruit_BNO055_STEMMA_QT | Adafruit IMU BNO055 | U13 |
| 1 | ~ | 5V, 5.5A Step-Down Voltage Regulator D36V50F5 | U14 |
| 1 | Bluetooth_Module_(HC-05) | PinHeader_1x06_P2.54mm_Vertical | U15 |
| 1 | Bluetooth_Module_(HC-06) | PinHeader_1x04_P2.54mm_Vertical | U16 |
| 1 | BSC040N10NS5 | TDSON-8-1 | Q1 |
| 1 | Q_Photo_NPN | LED_D3.0mm | Q2 |
| 1 | Battery Buzzer | PinHeader_1x09_P2.54mm_Vertical | J1 |
| 1 | BACKUP 3V3 | SolderWire-0.75sqmm_1x02_P4.8mm_D1.25mm_OD2.3mm | J3 |
| 1 | SPI | PinSocket_1x05_P2.54mm_Vertical | J5 |
| 1 | Solenoid | SolderWire-0.75sqmm_1x02_P4.8mm_D1.25mm_OD2.3mm | J6 |
| 1 | Motor 1 | PinSocket_1x06_P2.54mm_Vertical | J7 |
| 1 | Motor 2 | PinSocket_1x06_P2.54mm_Vertical | J8 |
| 1 | Motor 3 | PinSocket_1x06_P2.54mm_Vertical | J9 |
| 1 | Motor 4 | PinSocket_1x06_P2.54mm_Vertical | J10 |
Show 21 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LEFT HEADERS | PinHeader_1x24_P2.54mm_Vertical | J11 |
| 1 | RIGHT HEADERS | PinHeader_1x24_P2.54mm_Vertical | J12 |
| 1 | MID HEADERS | PinHeader_1x05_P2.54mm_Vertical | J13 |
| 1 | UART | PinSocket_1x03_P2.54mm_Vertical | J14 |
| 1 | I2C | PinSocket_1x03_P2.54mm_Vertical | J15 |
| 1 | 4S Battery | DEANS | J16 |
| 1 | Power Switch | AMASS_XT30UPB-F_1x02_P5.0mm_Vertical | J17 |
| 1 | Batt Bal | JST_XH_B5B-XH-A_1x05_P2.50mm_Vertical | J18 |
| 1 | 5V PI | SolderWire-0.75sqmm_1x02_P4.8mm_D1.25mm_OD2.3mm | J19 |
| 1 | ESC PWR | SolderWire-0.5sqmm_1x02_P4.6mm_D0.9mm_OD2.1mm | J20 |
| 1 | Line | JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J21 |
| 1 | ESC PWM | PinHeader_1x03_P2.54mm_Vertical | J23 |
| 1 | LED | LED_D3.0mm | D1 |
| 1 | STTH2002G-TRn | TO-263-2 | D4 |
| 4 | 10uF | C_0805_2012Metric | C1, C7, C8, C9 |
| 1 | 100uF | CP_Radial_D10.0mm_P5.00mm | C2 |
| 4 | 750uF | CP_Radial_D10.0mm_P5.00mm | C3, C4, C5, C6 |
| 4 | 30R | R_0805_2012Metric | R1, R3, R5, R7 |
| 8 | 10K | R_0805_2012Metric | R2, R4, R6, R9, R10, R11, R12, R14 |
| 3 | 15R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8, R15, R16 |
| 1 | 95R | R_0805_2012Metric | R13 |
Main 3.1 design files
The KiCad project lives in the hughminhphan/PROJECTS repository on GitHub; these links point at the commit this page was built from.
Main 3.1: common questions
What microcontroller does the Main 3.1 use?
The Main 3.1 is built around the Arduino Compatible DC-DC Boost Module with Display, from the AVR/Arduino family.
How big is the Main 3.1 PCB?
The Main 3.1 measures 3.2 × 3.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Main 3.1?
65 components, from 41 distinct parts. The full bill of materials is listed on this page.
Where can I download the Main 3.1 design files?
From the hughminhphan/PROJECTS repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Main 3.1 design in my own project?
The repository has no license, so all rights stay with hughminhphan. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Main 3.1 without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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