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The Elektor LoRa Node

Versatile, long-range, 868-MHz remote control with state feedback and STM32 Inside

The Elektor LoRa Node
The Elektor LoRa Node
Labs Project
Based on a Labs project | September 2019 | Find it here
Convinced of the combined power of open-source hardware and software, Elektor smashes the myth that LoRa is for pros only. This article not only tells the story of persistence in electronics design in the face of real challenges, but also of a 3-element LoRa Node you can easily replicate for reliable on/off control with status feedback and covering distances 10 to 20 times those of consumer-level WiFi and 433-MHz ISM LPR.

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Materials

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.

The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

Components

The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.

Download the BOM list

Component list

Component List

For LoRAWAN Experimental Platform board

Note: 2 required, 1 for Switch, 1 for Button.

 

Resistors

R1 = 100kΩ, thick film, 5%, 0.1W, 150V

R2,R10 = 680Ω, thick film, 5%, 0.1W, 150V

R3,R8,R9 = 4.7kΩ, thick film, 5%, 0.1W, 150V

R4,R5,R11 = 10kΩ, thick film, 5%, 0.1W, 150V

R6,R7 = 150kΩ, thick film, 5%, 0.1W, 150V

 

Capacitors

C1,C5,C8,C14,C15 = 4.7µF, 16V, X7R, SMD 0805

C2,C3,C7,C9,C10,C11,C12,C17,C18 = 100nF, 50V, X7R, SMD 0805

C4 = see text

C6 = 470nF, 25V, X7R, SMD 0805

C16 = not fitted

C20 = not fitted

C19,C21 = 100µF, 10V, SMD 1206 [3216 Metric], ± 20%, X5R

 

Semiconductors

D1 = PMEG3010EJ, 115, diode, 30V, 1A    

LED1 = low current, red, SMD 0805

LED2 = low current, green, SMD 0805

T1 = SI2347DS, MOSFET, p-channel, 5A, 30V, 0.033Ω

IC1 = TLV809K33DBVR, voltage supervisor

IC2 = TLV75533PDBVR, 3V3 LDO, 500mA, low-IQ, SOT-23-5

IC3 = optional. Space for: AT25SF081-SSHD-T 8Mbit flash IC

IC4 = STM32F072C8T6TR ARM Cortex-M0 microcontroller

IC5 = optional. Space for: ATECC608A-SSHDA-B, CryptoAuthentification

IC6,IC7 = MAX40200AUK+T ‘Ideal Diode’ controller, 1-channel, 1A

MOD1 = RFM95W-868S2 LoRa transceiver, Elektor Store SKU 18715

 

Miscellaneous

X1 = 32.768 kHz oscillator module, SMD, 3.2mm x 1.5mm (Abracon ASH7KW-32.768KHZ-L-T)

S1,S2 = switch, tactile feedback, 12V, 50mA (Multicomp TM-553I-Q-T/R)

Bt1, Bt2 = optional. Space for: AAA battery holder with PCB pins (Multicomp MP000341)

F1,F2 = 500mA PPTC resettable fuse (Bel Fuse 0ZCK0050FF2E)

K1 = PCB pin

K2 = 2-pin pinheader

K3 = 4-pin SIL pinheader

K4 = 5-pin pinheader

K5 = 17-way SIL pinheader

K6 = 3-pin pinheader

K5,K6,K3,K4 = 40-pin SIL pinheader

ANT1 = Wire antenna, 1mm enamelled copper wire, length 8.2cm

PCB 180516 V3.1 from Elektor Store

Component List

For Lora AC Switch Board

 

Resistors

R1 = NTC, 120Ω, Epcos type B57236S0121M000

R2,R3 = 10Ω, carbon film, 5%, 0.25W, 250V

R4 = 100kΩ, carbon film, 5%, 0.25W, 250V

R5,R6 = 47kΩ, carbon film, 5%, 0.25W, 250V

R7,R8 = 1kΩ, carbon film, 5%, 0.25W, 250V

 

Inductor

L1 = ACM4520V-231-2P-T common-mode filter (Farnell # 2455201)

 

Capacitors

C1,C2 = 100nF, 50V, X7R, 0.2’’ (5.08mm) pitch

C3 = 1µF, 16V, radial, 5mm

C4 = 10µF, 16V, radial, 5mm

 

Semiconductors

D1,D2 = 1N4148

D3 = 1N4007

T1,T2 = BS170

IC1 = CNY65 optocoupler

 

Miscellaneous

RE1 = G5RLK1AEDC5 power relay, latching dual coil, 5V, 16A, SPST (Omron)

K1,K2 = 3-way PCB screw terminal block, 0.3’’ (7.62 mm), 500V

K3 = 2-row board-to-board connector, 0.1’’ (2.54mm) pitch, 16 contacts, receptacle, WR-PHD series, surface mount (Würth # 610316243021)

S1 = Pushbutton switch, IP68 class (Alcoswitch PB6B2FM3M1CAL07)

MOD1 = AC/DC PCB mount power supply 5V, 200mA (Mean Well IRM-02-5)

F1,F2 = Fuseholder, PCB mount, 5x20mm

F1 = 60mAT fuse, 20mm

F2 = 5AT fuse, 20mm

PCB 180666-1 V1.1 from Elektor Store

Case: HAMMOND 1591-ATBU (Ice Blue)

 

Component List

For LoRa Button board

 

Resistors

R1 = 270Ω, carbon film, 5%, 0.25W, 250V

R2 = 10kΩ, carbon film, 5%, 0.25W, 250V

R3,R4 = 680Ω, carbon film, 5%, 0.25W, 250V
 

Semiconductors

LED2 = red, 3mm

LED1 = green, 3mm

 

Miscellaneous

K2,K4 = 2-way PCB screw terminal block, 0.2’’ pitch (5.08mm), 630V

K3 = pinheader socket, breakable, 1 row, 5-way, vertical

K5 = pinheader socket, breakable, 1 row, 17-way, vertical (see text)

K6 = Pinheader socket, breakable, 1 row, 3-way, vertical

1 pc. Switch with blue integral LED

 

Miscellaneous

Blue 0.96" OLED display, I²C, 4-pin (optional)

PCB 180666-2 V1.2 from Elektor Store

Case: Spelsberg type TK PS 94 x 94 x 57 mm, IP66

 

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