4 layers29.7 × 27.6 mm
4 layers91.2 × 100.3 mm
DotBot
DotBots/DotBot-hardware5DotBot hardware documents
- Size
- 91.2 × 100.3 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 65
- Nets
- 92
- Pads
- 292
- Tracks, vias
- 647, 398
- Pours
- 13
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 7 Apr 2021
- Updated
- 13 Aug 2024
Overview
DotBot is an open-source printed circuit board by DotBots, from the DotBots/DotBot-hardware repository on GitHub, published under the BSD-3-Clause licence. It is a 4-layer board of 91.2 × 100.3 mm with 65 parts on 92 nets, routed with 647 tracks and 398 vias.
It is built around the DRV8833PWP, MAX1723EUK and ADP121-AUJZ33R7, with the BT40, LM5158-Q1 and DMP2045U-7 among its other parts. Its parts include 20 capacitors, 14 resistors, 9 ICs, 8 connectors and 4 transistors.
Main components
8
DRV8833PWP
ETSSOP-16-EP-40℃~+85℃ 1.5A 2 2.7V~10.8V 2.7V~10.8V 360mΩ Bipolar Driver Overcurrent Protection、Short-Circuit Protection、Over temperature protection、Under-voltage lockout、Dead-time / shoot-through protection Yes ETSSOP-16-EP Stepper Motor Driver ROHSTexas InstrumentsStepper Motor DriverMAX1723EUK
--40℃~+85℃ 1 1.5uA 150mA 2V~5.5V 800mV~5.5V Adjustable Boost Boost Built-in Light load efficient mode、Adjustable current limiting Yes - DC-DC Converters ROHSMaxim Integrated (Analog Devices)DC-DC Converters
ADP121-AUJZ33R7
TSOT-5-40℃~+125℃@(Tj) 1 150mA 180mV@(150mA) 3.3V 40uA 5.5V 60dB@(10kHz) 65uVrms Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown、Enable control、Input under-voltage protection、Built-in soft-start Positive TSOT-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAnalog DevicesLinear Voltage Regulators (LDO)BT40
--Domestic brandOther Hardware
LM5158-Q1
WQFN-16_L3.0-W3.0-P0.50-EP1.7WQFN-16 New Arrivals ROHSTexas InstrumentsUncategorised
DMP2045U-7
SOT-23-55℃~+150℃ 1 P-Channel 1V 20V 4.3A 6.8nC 634pF 66pF 800mW 90mΩ@1.8V SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETsDMG2301L-7(ES)
SOT-23SOT-23 MOSFETs ROHSElecSuperMOSFETs
PMEG6030EVPX
SOD-1281 Independent 115uA@60V 3A 420mV@3A 60V 70A SOD-128 Schottky Diodes ROHSNexperiaSchottky Diodes
README
README.mdDotBot - PCB and Mechanical Parts
Introduction
This repository contains hardware projects for the DotBot robot:
- the Kicad project for the main PCB and for the Lighthouse 2 shield PCB
- the FreeCAD project for the mechanical parts (motor holders, ball caster wheel spacer and holder) that can be 3D printed
- SVG files for the optional top hat. These files can be used with a laser cutter
This repository also provides a list of off-the-shelf components required to assemble the DotBot:
- Pololu components (ball caster and encoder magnets)
- Pololu wheels (if not using the 3D printed version)
- Screws
- Threaded inserts
- 2 pins micro JST 2.0 male/female connectors
- 6V dual shaft DC motors
PCB
The Kicad projects are located in the pcb directory.
This PCB is based on:
- an nRF5340 microcontroller
- a dual DC motor driver
- magnetic encoders for the motors
- an extensible design with a pluggable shield
The full resolution schematics can be found at dist/pcb/schematic/DotBot.pdf
Shields
This repository already contains the kicad project for one shield in pcb/lh2 which embeds:
- an RGB LED
- an ST ISM330 IMU sensor
- an ST LIS3MDL magnetometer sensor
- a TS4231 connected to a photodiode: this design is used for indoor localization using a Lighthouse VR base station.
To help you start designing new compatible shields, check the shield template kicad project.
Hardware components
The Freecad project, Step files and 3D Manufacturing files are located in the parts directory.
Once you have collected all components and you have prepared them.
Assembling manual
The assembling manual will guide you through the setup of your DotBot.
Parts
65| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10nF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C7, C8, C9, C20 |
| 4 | DRV5015A1 | Package_TO_SOT_SMD:SOT-23 | U1, U2, U4, U5 |
| 3 | 100 | Resistor_SMD:R_0603_1608Metric | R12, R13, R14 |
| 3 | 10uF | Capacitor_SMD:C_0805_2012Metric | C5, C16, C17 |
| 3 | 1uF | Capacitor_SMD:C_0603_1608Metric | C11, C18, C19 |
| 3 | Extra Pins | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J8, J9, J10 |
| 2 | 100nF | Capacitor_SMD:C_0603_1608Metric | C3, C4 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R9 |
| 2 | 1R | Resistor_SMD:R_0603_1608Metric | R2, R3 |
| 2 | 22uF | Capacitor_SMD:C_0805_2012Metric | C10, C15 |
| 2 | DMP2045U-7 | Package_TO_SOT_SMD:SOT-23 | Q3, Q4 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | LD1, LD2 |
| 2 | Motor connector | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J11, J12 |
| 2 | Shield Header | Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical_SMD_Pin1Left | J1, J7 |
| 1 | +6v | TestPoint:TestPoint_Pad_D1.0mm | TP2 |
| 1 | 0 | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 1.5uH | Inductor_SMD:L_1008_2520Metric | L1 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 10uH | Inductor_SMD:L_Taiyo-Yuden_NR-30xx | L2 |
| 1 | 110pF | Capacitor_SMD:C_0603_1608Metric | C13 |
| 1 | 2.2uF | Capacitor_SMD:C_0603_1608Metric | C6 |
| 1 | 20k | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | 22nF | Capacitor_SMD:C_0603_1608Metric | C12 |
| 1 | 270k | Resistor_SMD:R_0603_1608Metric | R11 |
| 1 | 3.3v | TestPoint:TestPoint_Pad_D1.0mm | TP3 |
| 1 | 4.7k | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | 560k | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | 6.8nF | Capacitor_SMD:C_0603_1608Metric | C14 |
| 1 | 9.53k | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | ADP121-AUJZ33R7 | Package_TO_SOT_SMD:SOT-23-5 | U9 |
| 1 | BT40 | DotBot:BT40-V3 | U7 |
| 1 | Battery | Battery:BatteryHolder_MPD_BC2AAPC_2xAA | BT1 |
| 1 | DMG2301L-7 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | DMN62D0U-7 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | DRV8833PWP | Package_SO:HTSSOP-16-1EP_4.4x5mm_P0.65mm_EP3.4x5mm_Mask2.46x2.31mm_ThermalVias | U3 |
| 1 | LM5158 | Package_DFN_QFN:WQFN-16-1EP_3x3mm_P0.5mm_EP1.6x1.6mm_ThermalVias | U6 |
| 1 | MAX1723 | Package_TO_SOT_SMD:SOT-23-5 | U8 |
| 1 | PG | TestPoint:TestPoint_Pad_D1.0mm | TP1 |
| 1 | PMEG6030EVPX | Diode_SMD:D_SOD-128 | D1 |
| 1 | SWD | Connector_PinHeader_1.27mm:PinHeader_2x05_P1.27mm_Vertical_SMD | J6 |
| 1 | SW_SPDT | DotBot:SW_SPDT_PCM12 | SW1 |
Questions
How big is the DotBot PCB?
It measures 91.2 × 100.3 mm and has 4 copper layers, 1.6 mm thick.
What parts does the DotBot use?
65 parts, built around the DRV8833PWP, MAX1723EUK, ADP121-AUJZ33R7 and BT40. 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 DotBot KiCad files?
From the DotBots/DotBot-hardware repository on GitHub, at the commit this page was made from: the board is pcb/DotBot.kicad_pcb and its schematic pcb/DotBot.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the DotBot design in my own project?
Its repository publishes it under the BSD-3-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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