Long-Range Wireless Sensors
Hardware modules for communicating with battery-powered End-Points over a long-range wireless link are GSC's most recent developments (jointly with IceWire).
The modules are based on spread-spectrum, LoRa-compatible, sub 1 GHz, transceivers from Semtech (SX1276). These transceivers can operate through walls over very long distances (up to 15km in rural setting). Modules are optimized for battery-powered operation with life-times of many years depending on “sleep” duty cycles.
- End Points have transceiver and sensor plug-in sub-modules making customization fast and simple.
- End Point controller is a modern fast 32-bit ARM processor with floating point unit (STM32L486), and many peripherals including RTC, I2C, SPI, UART, COM, A/Ds and D/As, and uSD storage; It's optimized for low-power applications.
- Gateway (GW) is Raspberry Pi 3B with a custom “hat” having LoRa transceiver, real-time clock, and EEPROM.
- Easily customized for any sensor; current sensors are temperature, humidity, and 3-axis accelerometer, magnetometer, and gyroscope
Optimized for independent networks connected to the internet through the Gateway using a web server and data-base server running on the GW; a monthly subscription to a LoRaWAN cloud server is not required.
White Paper describing Sensor Interface Conditioners and demonstration platform.
White Paperr describing GSC's general purpose 0.5GHz-7.5GHz 40LP digital PLL with fractional/N functionality; one of four DPLL's GSC has developed.