HardLabs

Lora - RS485 bridge

RainDrop-lora·raindrop·Electronics/lora-rs485-bridge/lora-bridge.kicad_pcb

Lora - RS485 bridge PCB layout, top view — open source Microchip SAM board by RainDrop-lora
Simulate this board

About the Lora - RS485 bridge PCB

Lora - RS485 bridge is an open source Microchip SAM PCB design by RainDrop-lora, published on GitHub under the Apache-2.0 license. It is a 4-layer board measuring 63 × 50 mm, with 62 components from 29 distinct parts.

Its main chip is the ATSAMD21G18A-AUT, from the Microchip SAM family. Other key parts include the SN65HVD72, RFM95W-868S2 and NCP718. By type, the board carries 20 resistors, 15 capacitors, 9 diodes, 5 transistors, 5 connectors and 4 ICs.

It belongs with the rf & radio and power & battery designs in this gallery.

From the project

Soil moisture monitoring system on LoRaWAN network

This is a board that is specifically designed to easily hook up RS485 and I2C sensors to LoRaWAN network.

Arduino compatible (Adafruit Feather M0 based) Low power: Sleep current - 15uA Message cost @ SF7 - 38mC (~190k messages from 4xAA battery) Power switching for external I2C and RS485 sensors ESD protection Reverse polarity protection Wide input voltage range (up to 12V) * Footprint for edge SMA antenna connector

Lora - RS485 bridge, from the project README
From the project README

Main components on the Lora - RS485 bridge

SN65HVD72ATSAMD21G18A-AUTRFM95W-868S2NCP718

Lora - RS485 bridge bill of materials (BOM)

62 components, 29 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
SN65HVD72
U1
1
ATSAMD21G18A-AUT
U2
1
RFM95W-868S2
U3
1
NCP718
U4
4
Q_PMOS_GSD
Q1, Q3, Q4, Q7
1
Q_NMOS_GSD
Q2
1
32.768
Y1
1
battery
J1
1
i2c
J3
1
rs485
J4
1
SWD
J5
1
USB micro
J9
1
SW_Test
SW1
1
SW_Reset
SW2
1
Thermistor_PTC
TH1
3
D_TVS_x2_AAC
D1, D4, D9
1
7.6V
D2
1
1N4148
D3
1
D_TVS
D5
3
LED
D6, D7, D8
Show 9 more
QtyPartRefs
2
22p
C1, C2
9
1u
C3, C4, C5, C6, C8, C9, C12, C13 +1
4
4.7u
C7, C10, C11, C16
5
1k
R1, R13, R14, R15, R25
9
1M
R3, R4, R8, R9, R16, R17, R19, R21 +1
2
150
R5, R10
2
4.7k
R6, R7
1
20k
R11
1
10k
R12

Lora - RS485 bridge design files

The KiCad project lives in the RainDrop-lora/raindrop repository on GitHub; these links point at the commit this page was built from.

Lora - RS485 bridge: common questions

What microcontroller does the Lora - RS485 bridge use?

The Lora - RS485 bridge is built around the ATSAMD21G18A-AUT, from the Microchip SAM family.

How big is the Lora - RS485 bridge PCB?

The Lora - RS485 bridge measures 63 × 50 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Lora - RS485 bridge?

62 components, from 29 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Lora - RS485 bridge design files?

From the RainDrop-lora/raindrop repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Lora - RS485 bridge design in my own project?

Yes, under the terms of its Apache-2.0 license, which RainDrop-lora chose for the repository.

Can I test firmware for the Lora - RS485 bridge without the hardware?

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

More boards in raindrop

Similar boards