4 layers53 × 39 mm
Avclan mockingboard rounded
halleysfifthinc/AVCLAN-Mockingboard
Emulate a CD Changer on a Toyota AVC LAN network
43 parts65GPL-3.0
2 layers30.7 × 34.3 mm
ModbusRtuSensorHub
MichielVanwelsenaere/HomeAutomation.ModbusRtuSensorHub7PCB with small footprint designed to act as a Modbus RTU slave.
- Size
- 30.7 × 34.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 27
- Pads
- 103
- Tracks, vias
- 363, 18
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 28 Mar 2020
- Updated
- 8 Jan 2022
Overview
ModbusRtuSensorHub is an open-source printed circuit board by MichielVanwelsenaere, from the MichielVanwelsenaere/HomeAutomation.ModbusRtuSensorHub repository on GitHub, published under the MIT licence. It is a 2-layer board of 30.7 × 34.3 mm with 23 parts on 27 nets, routed with 363 tracks and 18 vias.
It is built around the ATTINY3216-SF, MAX1487CSA+T and MIC5504-3.3YM5. Its parts include 8 resistors, 4 capacitors, 2 ICs and 1 diode. It belongs with the interfaces and adapters and home automation and IoT boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
3
ATTINY3216-SF
SOIC-20-300mil-40℃~+125℃ 16MHz 18 2.7V~5.5V 256Byte 2KB 32KB 8 Bit AVR Built-in FLASH SOIC-20-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
MAX1487CSA+T
SOIC-80℃~+70℃ 1 1 128 2.5Mbps 230uA 4.75V~5.25V Half-Duplex Transceiver SOIC-8 RS-485 / RS-422 ICs ROHSMaxim Integrated (Analog Devices)RS-485 / RS-422 ICs
MIC5504-3.3YM5
SOT-23-5-40℃~+125℃@(Tj) 1 120uVrms 15uA 180mV@(300mA) 3.3V 300mA 5.5V 75dB@(1kHz) Fixed Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdModbus RTU Sensor Hub
:rotating_light: This project is not yet in V1.0 state and is to be considered a work in progress. A release will be created when everything is working as expected.
This PCB with limited footprint is designed to provide a robust and versitale sensor hub using Modbus RTU over RS485.
PCB
General
PCB measurements: ca 32mm x 30.5mm x 11mm
| PCB Front | PCB Back |
|---|---|
 |  |
Microcontroller
The sensor hub leverages the very capable ATtiny3216 (arduino compatible!).
- 32Kb flash, 2k SRAM - that's the same as an ATmega328p!
- 17 available I/O pins
- 8 PWM pins (6 on TCA0, 2 on TCD0) with 8-bit resolution.
- Servo, Tone, Serial, SPI and Wire (I2C) support "just works"
- 2 Type B timers - so Servo and Tone can both be used simultaneously, or one or both can be taken over for input capture, periodic interrupt, or other functionality.
- DAC output (just do analogWrite() on the DAC pin - voltage is between 0V and the DAC reference voltage, which can be set with setDACReference() ).
- 11 analog inputs, referenced to Vcc, external reference, or one of the 5 built-in analog references. Internal clock at up to 20MHz at 5v, up to 10MHz at 3.3v
Capabilities
- wide range of allowed power supply voltage: 7-30V
- onboard convertor for 3.3V power supply (300mA max)
- onboard convertor for 5V power supply (1.5A max, board power consumption not included)
- two dedicated RS485 connector for leveraging Modbus RTU (bus in and out)
- dedicated 1-Wire connector
- dedicated UPDI connector for programming the board
- dedicated SPI connector
- dedicated I²C connector
- 2 remaining digital pins
- 4 remaining digital/analog pins
Getting started
- Required Soldering Materials
- BOM (Bill Of Materials)
- Ordering the PCBs
- Soldering the PCBs
- Building an UPDI programmer
- Programming
Example projects
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10k | Resistor_SMD:R_1206_3216Metric | R4, R5, R6, R7, R8 |
| 3 | 100u | Capacitor_SMD:C_1206_3216Metric | C1, C2, C3 |
| 2 | Conn_01x03 | Connector_JST:JST_SH_SM03B-SRSS-TB_1x03-1MP_P1.00mm_Horizontal | 1-Wire1, UPDI1 |
| 1 | 100u | Capacitor_SMD:CP_Elec_6.3x7.7 | C4 |
| 1 | 120 | Resistor_SMD:R_1206_3216Metric | R3 |
| 1 | 300 | Resistor_SMD:R_1206_3216Metric | R1 |
| 1 | 4.7k | Resistor_SMD:R_1206_3216Metric | R2 |
| 1 | ATtiny3216-S | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U1 |
| 1 | Conn_01x04 | Connector_JST:JST_XH_S4B-XH-A-1_1x04_P2.50mm_Horizontal | RS485 |
| 1 | Conn_01x04 | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | I²C1 |
| 1 | Conn_01x06 | Connector_JST:JST_SH_SM06B-SRSS-TB_1x06-1MP_P1.00mm_Horizontal | SPI1 |
| 1 | Conn_01x9 | Connector_PinHeader_2.54mm:PinHeader_1x09_P2.54mm_Vertical | H1 |
| 1 | LD1086DT50TR | Package_TO_SOT_SMD:TO-252-2 | LDO1 |
| 1 | LED | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D1 |
| 1 | MAX1487CSA+T | MAX1487CSA_T:SOIC127P600X175-8N | U2 |
| 1 | MIC5504-3.3YM5 | Package_TO_SOT_SMD:SOT-23-5 | LDO2 |
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Questions
How big is the ModbusRtuSensorHub PCB?
It measures 30.7 × 34.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ModbusRtuSensorHub use?
23 parts, built around the ATTINY3216-SF, MAX1487CSA+T and MIC5504-3.3YM5. 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 ModbusRtuSensorHub KiCad files?
From the MichielVanwelsenaere/HomeAutomation.ModbusRtuSensorHub repository on GitHub, at the commit this page was made from: the board is src/ModbusRtuSensorHub.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the ModbusRtuSensorHub design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).