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A SATCOM platform for relaying messages in remote locations.

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Satellite Communication Relay

About

A SATCOM platform for relaying messages in remote locations. This project provides a standard interface for messages to be relayed over a Satcom link. Initially, this is using the RockBlock Iridium 9603 satellite modem, but the system is designed to be able to handle any other satcom system designed for small burst data transmissions.

System Design

Relay MCU

Iridium Modem Interface MCU

Arduino Libraries

  • Adafruit GPS Library by Adafruit
  • IridiumSBDi2c by SparkFun Electronics (datasheet)
  • ArduinoJson by Benoit Blanchon

Wiring Diagram

fritzing

*Note on connecting AdaLogger Feather and LoRa Feather: Only pins with indicated wires should be connected to quadrupler. All others should be removed or folded out of the way.

Architecture Diagram

architecture

Hardware Assembly

hardware-collapse-animation.gif

Bill of Materials

Short Name Product Name Price Link
MCU Feather M0 Basic Proto $19.95 https://www.adafruit.com/product/2772
GPS Ultimate GPS FeatherWing $24.95 https://www.adafruit.com/product/3133
SATCOM Interface MCU Feather M0 Adalogger $19.95 https://www.adafruit.com/product/2796
Stacking Headers Stacking Headers for Feather - 12-pin and 16-pin female headers $1.25 https://www.adafruit.com/product/2830
SATCOM Modem RockBlock 9603N $249.95 https://www.adafruit.com/product/4521
PCB-A Feather Quad Side-By-Side $9.95 https://www.adafruit.com/product/4254
PCB-B RockBlock to Feather Adapter --- Design Files
Battery Lithium Ion Battery Pack - 3.7V 6600mAh $24.50 https://www.adafruit.com/product/353
GPS Battery CR1220 Coin Cell Battery $0.95 https://www.adafruit.com/product/380
Sensor FeatherWing FeatherWing Proto $4.95 https://www.adafruit.com/product/2884
Micro SD Card Micro SD Card --- ---
Dry Box Case SE 56 Micro $26.00 https://evergreencases.com/
Dry Box Screws Rounded Head Thread-Forming Screws for Brittle Plastic, 18-8 Stainless Steel, Number 4 Size, 3/8" Long --- https://www.mcmaster.com/97349A100/
3D Printed Case Chassis SE56-chassis.STL --- SE56-chassis.STL
Threaded Inserts Tapered Heat-Set Inserts for Plastic Brass, M2.5 x 0.45 mm Thread Size, 3.4 mm Installed Length --- https://www.mcmaster.com/94180A321/
Mounting Screws Button Head Hex Drive Screw Passivated 18-8 Stainless Steel, M2.5 x 0.45 mm Thread, 4mm Long --- https://www.mcmaster.com/92095A456/
Mounting Screws Button Head Hex Drive Screw 18-8 Stainless Steel, M2.5 x 0.45 Thread Size, 20mm Long --- https://www.mcmaster.com/92095A115/

Operations

The M0 uses SERCOM2 (RX pin 5 and TX pin 22) to listen for JSON messages from other devices. These messages then get additional keys added (uptime_ms and version) and then logged out the console.

The M0 will automatically go to sleep after AWAKE_INTERVAL (1 minute) if the interrupt pin (A1) hasn't been toggled. Every time the interrupt pin is toggled the awakeTimer is reset and the count towards AWAKE_INTERVAL starts over. When in sleep mode, toggling the interrupt pin will wake up the M0 again.

About

A SATCOM platform for relaying messages in remote locations.

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