The Multiprotocol Radio Shield is an interconnection shield for Arduino, and was designed to connect two communication modules at the same time. This that means a lot of possibilities and applications can be made using the cooking-hacks modules. The Multiprotocol Radio Shield includes the SPI bus connections that allows the use of the RS-485 and CAN Bus modules and LoRa, but also is compatible with the rest of the cooking-hacks modules as RFID, XBee and Bluetooth.
What can we do using this shield?:
The Multiprotocol Radio Shield is an interconnection shield for Arduino, and was designed to connect two communication modules at the same time. This that means a lot of possibilities and applications can be made using the cooking-hacks modules.
The Multiprotocol Radio Shield includes the SPI bus connections that allows the use of the RS-485 and CAN Bus modules, but also is compatible with the rest of the cooking-hacks modules as RFID, XBee and Bluetooth.
The RS-232 standard was first introduced in 1962 by the Radio Sector of the EIA. The original DTEs (data terminal equipment) were electromechanical teletypewriters, and the original DCEs (data circuit-terminating equipment) were usually modems.
For many years, an RS-232-compatible port was a standard feature for serial communications, such as modem connections, on many computers. The RS-232 standard is still used to connect industrial equipment (such as PLCs), console ports and special purpose equipment.
The RS-485 module for Arduino and Raspberry allows users to perform industrial and domotic applications. The RS-485 is the most versatile communication standard in the standard
This a standard defining the electrical characteristics of drivers and receivers for use in digital systems. It does not specify or recommend any communications protocol. In the next table the electrical characteristics of the standart are defined.
Libelium's LoRa module works in both 868 and 900 MHz ISM bands, which makes it suitable for virtually any country. Those frequency bands are lower than the popular 2.4 GHz band, so path loss attenuation is better in LoRa. In addition, 868 and 900 MHz are bands with much fewer interference than the highly populated 2.4 GHz band.
Besides, these low frequencies provide great penetration in possible materials (brick walls, trees, concrete), so these bands get less loss in the presence of obstacles than higher bands.
CAN is a multi-master broadcast serial bus standard for connecting electronic control units (ECUs). Each node is able to send and receive messages, but not simultaneously. A message consists primarily of an ID (identifier), which represents the priority of the message. A CAN message that is transmitted with highest priority will succeed and the node transmitting the lower priority message will sense this and back off and wait.
The information is transmitted by two twisted wires that connect all system modules. It is transmitted by voltage difference between the two levels. The high voltage value represents 1 and low 0. Its combination forms an appropriate message.
Modbus allows communication between many devices connected to the same network, for example a system that measures temperature and humidity and communicates the results to a computer
Many of the data types are named from its use in driving relays: a single-bit physical output is called a coil, and a single-bit physical input is called a discrete input or a contact.
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