2 layers98.9 × 78 mm
Siot gateway particle io
simpleiot/hardware
Hardware designs for IoT devices and sensor nodes.
28 parts9Apache-2.0
2 layers21.6 × 21.6 mm
Siot node temp
simpleiot/hardware9Hardware designs for IoT devices and sensor nodes.
- Size
- 21.6 × 21.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 9
- Nets
- 6
- Pads
- 25
- Tracks, vias
- 44, 14
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 21 Sep 2019
- Updated
- 4 Mar 2021
Overview
Siot node temp 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 21.6 × 21.6 mm with 9 parts on 6 nets, routed with 44 tracks and 14 vias.
It is built around the ADP7142AUJZ-3.3-R7. Its parts include 4 connectors, 2 capacitors, 2 resistors and 1 IC. It belongs with the home automation and IoT boards of this library.
Main components
1README
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
9| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 1K | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | 2.2uF_50V | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 2 | Conn_01x03 | BEC:1x03_solder-pads | J2, J3 |
| 2 | xConnect_smd | BEC:xConnect_smd | J1, J4 |
| 1 | ADP7142AUJZ-3.3 | Package_TO_SOT_SMD:TSOT-23-5 | U1 |
Questions
How big is the Siot node temp PCB?
It measures 21.6 × 21.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Siot node temp use?
9 parts, built around the ADP7142AUJZ-3.3-R7. 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 temp KiCad files?
From the simpleiot/hardware repository on GitHub, at the commit this page was made from: the board is siot-node-temp/siot-node-temp.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Siot node temp 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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