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IoT WA - RS485

RWTH-EBC·OSIGBApp·Schematics/iot-development.hardware.iotgate_v3.iot_rs485/Design/iot_rs485.kicad_pcb

IoT WA - RS485 PCB layout, top view — open source ESP32 board by RWTH-EBC
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About the IoT WA - RS485 PCB

IoT WA - RS485 is an open source ESP32 PCB design by RWTH-EBC, published on GitHub under the MIT license. It is a 2-layer board measuring 75 × 44 mm, with 31 components from 19 distinct parts.

Its main chip is the ESP32-WROOM-32D, from the ESP32 family. Other key parts include the VXO7805-500-M, AZ1117IH-3.3 and MAX13487. By type, the board carries 10 resistors, 7 capacitors, 4 ICs, 2 transistors, 2 connectors and 2 switches.

It belongs with the iot & wireless designs in this gallery.

From the project

Open-Source Internet of Things (IoT) Gateways for Building Automation Applications

This repository entails the specifications and PCB design of a gateway communicating with devices via Modbus RTU or BACnet MS/TP.

Specifications: Battery: None Case: Datasheet outer dimensions: 85 x 85 x 37 mm inner dimensions: 73 x 73 x 25 mm PCB-Measurements: 75 x 40 x 1.6 mm

Components: ESP32-WROOM-32D(16MB) Header Pins for flashing bridge ESP-Prog UART TTL to RS485 converter (Maybe BACnet needs an own gateway with a card reader? Needs to be tested) Modbus-RTU BACnet MS/TP Additional components: Double relay switch Connector: 9 Position Screw Terminal TB001-500-09BE * Datasheet

IoT WA - RS485, from the project README
From the project README

Main components on the IoT WA - RS485

ESP32-WROOM-32DVXO7805-500-MAZ1117IH-3.3MAX13487

IoT WA - RS485 bill of materials (BOM)

31 components, 19 distinct parts.

QtyPartRefs
1
ESP32-WROOM-32D
U1
1
VXO7805-500-M
U2
1
AZ1117IH-3.3
U3
1
MAX13487
U4
2
2N7002
Q1, Q2
1
Conn_02x03
J1
1
Conn_01x09
J3
1
RT424024
K1
2
PTS815
SW1, SW2
1
BAT60A
D1
1
150060RS75000
D2
1
22u
L1
2
10u
C1, C4
2
22u
C2, C3
3
100n
C5, C6, C7
6
10k
R1, R2, R3, R4, R5, R10
2
220
R6, R8
1
120
R7
1
270
R9

IoT WA - RS485 design files

The KiCad project lives in the RWTH-EBC/OSIGBApp repository on GitHub; these links point at the commit this page was built from.

IoT WA - RS485: common questions

What microcontroller does the IoT WA - RS485 use?

The IoT WA - RS485 is built around the ESP32-WROOM-32D, from the ESP32 family.

How big is the IoT WA - RS485 PCB?

The IoT WA - RS485 measures 75 × 44 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the IoT WA - RS485?

31 components, from 19 distinct parts. The full bill of materials is listed on this page.

Where can I download the IoT WA - RS485 design files?

From the RWTH-EBC/OSIGBApp repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the IoT WA - RS485 design in my own project?

Yes, under the terms of its MIT license, which RWTH-EBC chose for the repository.

Can I test firmware for the IoT WA - RS485 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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