![]() ![]() ![]() Once you have all this setup, we can start working on the code. You will also need a power supply to power up the device. The isolated 4-20mA current loop transmitter board has a 2 connection screw terminal which provides 4-20mA output, over here you can connect the device or sensor you want control. Automation Systems Interconnect ASI ASI451124 Single Channel Dual Output Analog Signal Isolator Transmitter Splitter, 3-Way Isolation, DIN Rail Mount, Single 4-20 mA Input, Dual 4-20 mA Output. To connect the arduino with 4-20mA current loop transmitter board all you will need to do is insert the arduino module into the arduino i2c shield and use an i2c cable to connect these two boards together. It is real simple to interface these isolated 4-20mA current loop receiver boards with arduino, raspberry pi, usb or any other computer, You can follow the exact same steps and can make it work with any of the platforms. By chaining the address bit its possible to connect two 4-20mA current loop transmitter boards together. ![]() The board works on i2c communication and it has 1 address bit. This one channel isolated 4-20mA current loop transmitter board has 1kV power isolation and also has i2c communication isolation( 2500Vrms). In this post we will be using this one and the 4 channel will work in same way. Sold by Funiquee and ships from Amazon Fulfillment. On the one channel 4-20mA transmitter the DAC is MCP4725. This item: DC 420mA Signal Isolator, Module Signal Transmitter Conditioner Signal Converter Detect Signal Conditioner(One in two out, 0-10V) 32.19. This isolated 4-20mA current loop transmitter has a 12 bit DAC which provides high resolution 4-20mA output. If input is 2-wire sensor signal, user need to add power supply in serial connection. The sensor or device values are changed by varying the current value. 1-channel 4-20mA source signal or 4-wire 4-20mA signal input, 2-channel 4-20mA signal output, 4-20mA signal splitter. The 4-20mA current loop is also known as 2 wire protocol, in such setups there are two wires which control the device as well as provide the power using same two wires. To control such a sprinkler you will change the current output using arduino and this current output will control the sprinkler. For example lets say you want to want to control a sprinkler which works on 4-20mA current loop signal, in that case you will need a 4-20mA current loop transmitter board. 4-20mA transmitter devices are used to provide 4-20mA signal which can be used to control pumps, valves, switches and transducers. In our last post we interfaced 4-20mA current loop receiver with the arduino, in this article we will learn how you can interface isolated 4-20mA current loop transmitter board with arduino. The SI231 is an isolated loop-powered signal converter for common process signals, and features: Field configurable inputs 4-20mA, 0-1mA, 0-10mA, 0-20mA. Interfacing Isolated 4-20mA Current Loop Transmitter Arduino ![]()
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