2 layers98.9 × 78 mm
Siot gateway particle io
simpleiot/hardware
Hardware designs for IoT devices and sensor nodes.
28 parts9Apache-2.0
2 layers37.2 × 46.6 mm
Siot node relay
simpleiot/hardware9Hardware designs for IoT devices and sensor nodes.
- Size
- 37.2 × 46.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 9
- Pads
- 48
- Tracks, vias
- 61, 17
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 21 Sep 2019
- Updated
- 4 Mar 2021
Overview
Siot node relay is an open-source printed circuit board by simpleiot, from the simpleiot/hardware repository on GitHub, published under the Apache-2.0 licence. It is a 2-layer board of 37.2 × 46.6 mm with 12 parts on 9 nets, routed with 61 tracks and 17 vias.
It is built around the DS2413P+T&R and ADP7142ARDZ-5.0. Its parts include 4 connectors, 2 capacitors, 2 ICs, 1 diode and 1 switch. It belongs with the home automation and IoT boards of this library.
Main components
2
DS2413P+T&R
TSOC-60℃~+70℃ 1-Wire 100Kbps 2.8V~5.25V Power-up/reset configuration TSOC-6 I/O Expanders ROHSMaxim Integrated (Analog Devices)Interface - Specialized
ADP7142ARDZ-5.0
SOIC-8-40℃~+125℃@(Tj) 1 11uVrms 200mA 200mV@(200mA) 40V 50dB@(1MHz) 50uA 5V Fixed Over Current Protection、Thermal shutdown、Enable control、Input under-voltage protection、Adjustable soft-start、Built-in soft-start Positive SOIC-8 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAnalog DevicesVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
rpi-odroid-expansion/README.mdrPI/Odroid Exansion Board
Features
This board is designed to provide a number of expansion features to Raspberry PI and ODROID-C4 SBCs.
- CAN
- RS485
- 1-wire
- LCD/Touchscreen
- pass through rPI expansion connector to provide use of unused pins.
- XBee socket (Digi, Nimbelink, etc radios)
- reference design: https://nimbelink.com/products/raspberry-pi-skywire-adapter/
- supports both standard 40-pin expansion and compute module
- LoraWan radio
MPU Interface
MPU/MCU communication link
There is a UART and SPI ports (todo) wired between the host MPU and the MCU on the expansion board.
- UART is likely simplest as the existing CAN firmware implements a USB serial port. Also, for RS485, it is just a pass through.
- SPI would allow us to run both CAN and RS485 at the same time.
- may only be two hardware SPI chip selects, so not sure how well more than 2 SPI devices will work.
MCU Implementation
A STM32F042K4Tx MCU is used to implement the following functionality:
- CAN Interface
- Board ID EEPROM (implements i2c slave)
Reference
CAN
Can is typically implemented using a SPI CAN controller (ex MCP2517), but these devices do not offer any buffering so are a poor choice for non real-time operating systems like Linux. Thus, we've chosen to use a MCU to provide the CAN interface and hopefully leverage firmware from the following projects:
HAT ID EEPROM
RS485
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 2.2uF_50V | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 2 | MountingHole | MountingHole:MountingHole_3.5mm | H1, H2 |
| 2 | Screw_Terminal_5mm_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-2-5.0-H_1x02_P5.00mm_Horizontal | J3, J4 |
| 2 | xConnect_smd | BEC:xConnect_smd | J1, J2 |
| 1 | ADP7142ARDZ-5.0 | BEC:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm_ThermalVias | U2 |
| 1 | DS2413P_ | digikey-footprints:LSOJ-6_W3.76mm | U1 |
| 1 | G6DN-1A-L-DC5 | BEC:OMRON-G6DN-1A-L | K1 |
| 1 | RECT_50V_1A | Diode_SMD:D_SMA | D1 |
Questions
How big is the Siot node relay PCB?
It measures 37.2 × 46.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Siot node relay use?
12 parts, built around the DS2413P+T&R and ADP7142ARDZ-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 Siot node relay KiCad files?
From the simpleiot/hardware repository on GitHub, at the commit this page was made from: the board is siot-node-relay/siot-node-relay.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Siot node relay design in my own project?
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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