Libelium library

It is mandatory to include the 4-20 mA library when using this board. The following line must be introduced at the beginning of the code:

#include <currentLoop.h>

Waspmote's API 4-20 mA files:

• currentLoop.cpp

• currentLoop.h

API's functions

Public functions:	Action realized:
uint8_t ON(uint8_t powerSupply)	Powers on the 4-20 mA supply (5 V or 12 V)
uint8_t OFF(uint8_t powerSupply)	Powers off the 4-20 mA supply (5 V or 12 V)
int readChannel(uint8_t channel)	Gets the sensor value in integer format
float readVoltage(uint8_t channel)	Gets the sensor value as a voltage
readCurrent(uint8_t channel, float offSet)	Gets the sensor value as a current in mA and introduce an offSet correction factor
float readCurrent(uint8_t channel)	Gets the sensor value as a current in mA
uint8_t isConnected(uint8_t channel)	Checks if the current loop is well connected

When using the Plug & Sense! 4-20 mA model, the correspondence between the board channels and the external sockets is defined like this:

• channel 1 → socket A

• channel 2 → socket B

• channel 3 → socket C

• channel 4 → socket D

This way, a Plug & Sense! user with a sensor on socket A (channel 1 of the 4-20 mA sensor board) will use the next line to read it:

int value = currentLoopBoard.readChannel(SOCKET_A);