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GreatScott! Builds a LoRa Alarm System
In this article we present a project designed by Youtuber GreatScott! to transmit a notification signal from the intruder alarm system installed in his garage box to his apartment using LoRa, covering a distance of 600 metres. He used two STM32 Nucleo boards and two RFM95 LoRa modules (with Elektor breakout boards) sponsored by Elektor to build and test the hardware.
Component list
Component List
Note: parts required for receiver AND transmitter
(i.e. order 2 pcs of each item):
STM32 Nucleo L476RG Board
RFM95 Ultra LoRa Transceiver Module
Elektor RFM95 Break-out Board no. 191069-1
C1 = 100nF, 10%, 10V, MLCC, X7R, SMD 0805
C2 = 10µF, 20%, 10V, MLCC, X5R, SMD 0805
2 pcs 8-way pinheader 0.1'' (2.54mm) pitch
82 mm wire (antenna)
Additional parts for transmitter:
K1,K2 = 2-way PCB screw terminal block 0.2'' (5.08mm) pitch
Additional parts for receiver:
R1 = 10Ω
T1 = IRLML6344TRPBF (with optional breakout board) or TN0702 (TO-92 case)
Bz1 = 5VDC buzzer
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