2 layers85 × 60 mm
BaseModule
KarlVaello/VehicleControlSystem
Vehicle Control System. Using C++ Qt and C. Hardware and Software
67 parts14GPL-3.0
2 layers90 × 60 mm
Nexa is a Open Source Hardware board based on STM32f103 with a full duplex rs-485 interface
- Size
- 90 × 60 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 74
- Nets
- 69
- Pads
- 503
- Tracks, vias
- 618, 47
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 11 Jan 2018
- Updated
- 13 Feb 2018
Overview
Nexa is an open-source printed circuit board by KarlVaello, from the KarlVaello/Nexa-Board repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 90 × 60 mm with 74 parts on 69 nets, routed with 618 tracks and 47 vias.
It is built around the STM32F103C8T6, MAX485ED and LM1117-3.3, with the LM1117-5.0 among its other parts. Its parts include 24 resistors, 21 connectors, 11 capacitors, 6 diodes and 5 ICs. It belongs with the interfaces and adapters boards and the STM32 boards of this library.
Main components
4
STM32F103C8T6
LQFP-48(7x7)-40℃~+85℃ 12bit 20KB 2V~3.6V 32 Bit 37 64KB 72MHz ARM Cortex-M3 Built-in FLASH LQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
MAX485ED
SOP-8-40℃~+85℃ 1 1 1mA 32 4.75V~5.25V 5Mbps Half-Duplex Transceiver ±8kV SOP-8 RS-485 / RS-422 ICs ROHSHTCRS-485 / RS-422 ICs
LM1117-3.3
SOT-2231 1.3V@(1000mA) 15V 1A 2mA 3.3V Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHShongjiachengUncategorisedLM1117-5.0
SOT-2231 1.3V@(1000mA) 15V 1A 2mA 5V Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHShongjiachengUncategorised
README
README.md
NOTES!
In need of satisfying the ISO 15765-2 the board will receive hardware changes.
ISO 15765-2, or ISO-TP (Transport Layer), is an international standard for sending data packets over a CAN-Bus. The protocol allows for the transport of messages that exceed the eight byte maximum payload of CAN frames. ISO-TP segments longer messages into multiple frames, adding metadata that allows the interpretation of individual frames and reassembly into a complete message packet by the recipient. It can carry up to 4095 bytes of payload per message packet.
Full duplex RS-485 will be replaced by CAN-bus.
What is Nexa-Board?
Nexa-Board is an open source project, based on STM32F103 microcontroller with a full duplex RS-485 to create a multipoint network that allows receiving and sending the information of all the boards. RS-485 as a physical layer and by programming you can set your own data exchange and interpretation protocol.
Hardware characteristics
- 72 MHz
- Full duplex RS-485 fully configurable.
- CAN-BUS
- 17 GPIO pins
- 7 to 15 V power input
- Power input polarity protection
Why does it exist ?
Exist as a solution to get a fully configurable comunication protocol, that allow you to create your own protocol depending on your needs.
Getting Started
- Get a Nexa Board
Project that use Nexa-Board
- Nexa Home
TODO 
- Board design (Schematic)
- Board design (PCB)
- PCB manufacture
- HW test
- HW final version
- New hardware changes due to apply CAN-bus
- Board design (Schematic)
- Board design (PCB)
- PCB manufacture
- HW test
- HW final version
Releases
| v1.0 - Initial complete board concept
License
Parts
74| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 10k | Resistors_SMD:R_0603_HandSoldering | R7, R8, R9, R10, R11, R12, R13, R14 |
| 5 | Conn_01x02_Male | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | J2, J9, J10, J12, J13 |
| 5 | LED | LEDs:LED_0805_HandSoldering | D1, D2, D3, D4, D5 |
| 4 | 100nF | Capacitors_SMD:C_0603_HandSoldering | C1, C3, C4, C5 |
| 4 | 120R | Resistors_SMD:R_0603_HandSoldering | R3, R4, R19, R20 |
| 4 | 20K | Resistors_SMD:R_0603_HandSoldering | R15, R16, R17, R18 |
| 4 | 22pF | Capacitors_SMD:C_0603_HandSoldering | C6, C7, C8, C9 |
| 4 | Conn_01x01 | CarlosVaello:MountHoles_H3.2mm_D5.5 | J18, J19, J20, J21 |
| 3 | Conn_01x01 | Pin_Headers:Pin_Header_Straight_1x01_Pitch2.54mm | J14, J15, J16 |
| 2 | 100K | Resistors_SMD:R_0603_HandSoldering | R5, R6 |
| 2 | 100nF | Capacitors_SMD:C_0805_HandSoldering | C10, C11 |
| 2 | 10K | Resistors_SMD:R_0603_HandSoldering | R1, R23 |
| 2 | 2K | Resistors_SMD:R_0603_HandSoldering | R22, R24 |
| 2 | Conn_02x02_Top_Bottom | Pin_Headers:Pin_Header_Straight_2x02_Pitch2.54mm | J7, J8 |
| 2 | MAX485E | Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | U4, U5 |
| 1 | 1.0uF | Capacitors_SMD:C_0603_HandSoldering | C2 |
| 1 | 10uF - 25V | Capacitors_Tantalum_SMD:CP_Tantalum_Case-C_EIA-6032-28_Hand | CP1 |
| 1 | 1M | Resistors_SMD:R_0603_HandSoldering | R2 |
| 1 | 22uF - 16 V | Capacitors_Tantalum_SMD:CP_Tantalum_Case-B_EIA-3528-21_Hand | CP4 |
| 1 | 22uF - 16V | Capacitors_Tantalum_SMD:CP_Tantalum_Case-B_EIA-3528-21_Hand | CP2 |
| 1 | 32.768 KHz | Crystals:Crystal_SMD_SeikoEpson_MC306-4pin_8.0x3.2mm_HandSoldering | Y2 |
| 1 | 510R | Resistors_SMD:R_0603_HandSoldering | R21 |
| 1 | 8 MHz | Crystals:Crystal_HC49-4H_Vertical | Y1 |
| 1 | Conn_01x01 | Measurement_Points:Measurement_Point_Round-TH_Small | J17 |
| 1 | Conn_01x04 | Connectors_Molex:Molex_MiniFit-JR-5569-04A2_2x02x4.20mm_Angled | J3 |
| 1 | Conn_01x04 | Pin_Headers:Pin_Header_Straight_1x04_Pitch2.54mm | J1 |
| 1 | Conn_01x23 | Socket_Strips:Socket_Strip_Straight_1x23_Pitch2.54mm | J5 |
| 1 | Conn_02x03_Odd_Even | Pin_Headers:Pin_Header_Straight_2x03_Pitch2.54mm | J4 |
| 1 | D | Diodes_SMD:D_SMB | D6 |
| 1 | DB9_Female | SparkFun-Connectors:DB9 | J11 |
| 1 | LM1117-3.3 | TO_SOT_Packages_SMD:SOT-223 | U3 |
| 1 | LM1117-5.0 | TO_SOT_Packages_SMD:SOT-223 | U2 |
| 1 | Q_NMOS_GDS | TO_SOT_Packages_SMD:TO-252-2 | Q1 |
| 1 | STM32F103C8 | Housings_QFP:LQFP-48_7x7mm_Pitch0.5mm | U1 |
| 1 | SW_Push | Buttons_Switches_THT:SW_PUSH_6mm_h8.5mm | SW1 |
| 1 | proto_grid_15x21 | CarlosVaello:grid | J6 |
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Questions
How big is the Nexa PCB?
It measures 90 × 60 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Nexa use?
74 parts, built around the STM32F103C8T6, MAX485ED, LM1117-3.3 and LM1117-5.0. 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 Nexa KiCad files?
From the KarlVaello/Nexa-Board repository on GitHub, at the commit this page was made from: the board is Nexa/Nexa.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Nexa design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).