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    The ESP8266 module is a rhomb.io Slave Module that delivers highly integrated Wi-Fi solution to meet users’ continuous demands for efficient power usage, compact design and reliable performance in the Internet of Things industry. This module has been build around the ESP-WROOM-02 module from Espressif. Its complete and self-contained Wi-Fi networking capabilities can be controlled easily by AT commands through the UART interface.  
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    The S100 Slave - RF RFM69CW module is a certified Rhomb.io module with a transceiver capable of operation over a wide frequency range, including the 315, 433, 868 and 915 MHz license-free ISM (Industry, Scientific and Medical) frequency bands. All major RF communication parameters are programmable and most of them can be dynamically set. The RF RFM69CW offers the unique advantage of programmable narrow-band and wide-band communication modes. The RFM69CW is optimized for low power consumption while offering high RF output power and channelized operation.
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    The S100 Slave - uSD Holder v1.1 is a certified rhomb.io Slave module that contains a micro SD Holder. Like every Rhomb.io Slave Module, it can be controlled by the rhomb.io Masters.
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    The S100 Slave - RS-485 Module is a certified rhomb.io Module with two RS-485 transceiver IC that convert UART serial stream to RS-485, a serial communications standard widely used in industry for its simplicity and robustness. Due to the module has two transceivers, you can use two RS-485 buses independently or convert the system in full-duplex, it will depend on the configuration of the assembled resistors.
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    The S100 Slave - ALS VL6180X is a certified Rhomb.io module that includes proximity and ambient light sensors (ALS) that use the ST's FlightSense technology, that allow absolute distance to be measured independent of target reflectance by combining an IR emitter, a range sensor and an ambient light sensor in a three-in-one ready-touse reflowable package.
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    The LoRa RFM9X module is based on the HopeRF RFM9xW LoRa™ SiP (System in Package) family. Those transceivers feature the LoRa™ long range modem that provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. The module can achieve a sensitivity of over -148 dBm and has an internal +20 dBm power amplifier that make it perfect for applications requiring range and robustness. The following table summarizes the main features of the LoRa RFM9X module
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    The GPS-GPRS SIM868 is a rhomb.io S100 Slave Module that allows GPRS low speed communication and GNSS possitionining. Even more, it has an optional Bluetooth communication interface. The GPRS part, it is quad-band 850/900/1800/1900 MHz GSM/GPRS, with maximun speed of 85.6 kbps, available in eSIM and nanoSIM versions. The GNSS part has a low power consumption performance and supports various location applications including GPS, GLONASS and BEIDOU. About the optional part, it is Bluetooth 3.0 compliant (firmware upgrade required). All three parts has a 50Ω UMCC antenna connector for each one.
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    The S100 Slave - Camera Module with Trully Camera.
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    The S100 Slave - NFC PN532 is a certified rhomb module with a highly integrated transceiver module for near field communication at 13.56 MHz based on the 80C51 microcontroller core supporting different card and reader/writer operating modes.