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CatWAN Relay

ElectronicCats·CatWAN_Relay·Hw/CatWAN-Relay.kicad_pcb

CatWAN Relay PCB layout, top view — open source Microchip SAM board by ElectronicCats

About the CatWAN Relay PCB

CatWAN Relay is an open source Microchip SAM PCB design by ElectronicCats, published on GitHub. It is a 2-layer board measuring 50 × 86.9 mm, with 48 components from 29 distinct parts.

Its main chip is the ATSAMD21E, from the Microchip SAM family. Other key parts include the RFM95W-868S2, LTV-817, LM2596_DC-DC and AP2114H-3.3TRG1. By type, the board carries 11 resistors, 8 diodes, 7 ICs, 7 capacitors, 5 connectors and 3 transistors.

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

From the project

A board for relay control with LoRa compatible with LoRaWAN

Are you interested in applying LoRa in an industrial environment or even connect a CNC or a PLC as well to a LoRaWAN network?

This board allows you to communicate with every LoRa device which works in the 915 Mhz band.

In this board you will find 3 relays outputs and 3 opto-isolated inputs, and it can be powered from 12v to 24v with a on/off jumper.

By now the provided firmware works as an invisible way to connect two wireless relays based on interrupts, this board its compatible with the Arduino LoRa library from @sandeepmistry but it can work with the Radio Head library this using only…

CatWAN Relay, from the project README
From the project README

Main components on the CatWAN Relay

ATSAMD21ERFM95W-868S2LTV-817LM2596_DC-DCAP2114H-3.3TRG1

CatWAN Relay bill of materials (BOM)

48 components, 29 distinct parts.

QtyPartRefs
1
ATSAMD21E
U1
1
RFM95W-868S2
U2
3
LTV-817
U3, U4, U5
1
LM2596_DC-DC
U6
1
AP2114H-3.3TRG1
U7
3
MMBT2222A
Q1, Q2, Q3
3
UD2-3NU
Y1, Y2, Y3
1
INPUTS
J2
1
OUTPUTS
J3
1
SWD
J4
1
Serial
J5
1
USB_B
J10
1
Antenna_Shield
AE1
1
ADJ
JP1
1
RST
SW1
1
electronic
svg2mod
3
FM4007W-W
D1, D2, D3
1
FM4007W-W
D4
2
MBR120
D5, D8
1
ON
D6
Show 9 more
QtyPartRefs
1
Rx
D7
3
0.1uF
C1, C4, C5
1
470uF
C2
1
1uF
C3
2
10uF
C6, C7
3
10K
R1, R4, R7
3
1K
R2, R5, R10
3
330R
R3, R6, R8
2
120R
R9, R11

CatWAN Relay design files

The KiCad project lives in the ElectronicCats/CatWAN_Relay repository on GitHub; these links point at the commit this page was built from.

CatWAN Relay: common questions

What microcontroller does the CatWAN Relay use?

The CatWAN Relay is built around the ATSAMD21E, from the Microchip SAM family.

How big is the CatWAN Relay PCB?

The CatWAN Relay measures 50 × 86.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the CatWAN Relay?

48 components, from 29 distinct parts. The full bill of materials is listed on this page.

Where can I download the CatWAN Relay design files?

From the ElectronicCats/CatWAN_Relay repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the CatWAN Relay design in my own project?

The repository has no license, so all rights stay with ElectronicCats. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the CatWAN Relay 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.

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