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4-20 mA (Current Loop) Sensor Shield for Raspberry Pi

125 €125.00

Availability: In stock

The 4-20 mA Current Loop Board is one of the most robust sensor signaling standard. Current loops are ideal for data transmission because of their inherent insensitivity to electrical noise. In a 4-20 mA current loop, all the signaling current flows through all components; the same current flows even if the wire terminations are less than perfect. All the components in the loop drop voltage due to the signaling current flowing through them. The signaling current is not affected by these voltage drops as long as the power supply voltage is greater than the sum of the voltage drops around the loop at the maximum signaling current of 20 mA.

Transmitting sensor information via a current loop is particularly useful when the information has to be sent to a remote location over long distances (500 meters, or more). The loop operation is straightforward: a sensor output voltage is first converted to a proportional current, with 4 mA normally representing the sensor zero-level output, and 20 mA representing the sensor full-scale output. Then, a receiver at the remote end converts the 4-20 mA current back into a voltage which in turn can be further processed by a computer or display module.

This kit includes:
- 4-20 mA (Current Loop) Sensor Board for Arduino, Raspberry Pi and Intel Galileo
- Raspberry Pi to Arduino Shields Connection Bridge

4-20 mA Current Loop
Type Analog
Media Twisted pair
No. of channels 4
Distance 900 m
Supply 5-24V

Documentation:
Tutorial

Note: Raspberry Pi not included. You can take a look on the new Starter Kits for Raspberry Pi, or buy it separately.

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Description

The 4-20 mA Current Loop Board is one of the most robust sensor signaling standard. Current loops are ideal for data transmission because of their inherent insensitivity to electrical noise. In a 4-20 mA current loop, all the signaling current flows through all components; the same current flows even if the wire terminations are less than perfect. All the components in the loop drop voltage due to the signaling current flowing through them. The signaling current is not affected by these voltage drops as long as the power supply voltage is greater than the sum of the voltage drops around the loop at the maximum signaling current of 20 mA.

Transmitting sensor information via a current loop is particularly useful when the information has to be sent to a remote location over long distances (500 meters, or more). The loop operation is straightforward: a sensor output voltage is first converted to a proportional current, with 4 mA normally representing the sensor zero-level output, and 20 mA representing the sensor full-scale output. Then, a receiver at the remote end converts the 4-20 mA current back into a voltage which in turn can be further processed by a computer or display module.

This kit includes:
- 4-20 mA (Current Loop) Sensor Board for Arduino, Raspberry Pi and Intel Galileo
- Raspberry Pi to Arduino Shields Connection Bridge

4-20 mA Current Loop
Type Analog
Media Twisted pair
No. of channels 4
Distance 900 m
Supply 5-24V

Documentation:
Tutorial

Note: Raspberry Pi not included. You can take a look on the new Starter Kits for Raspberry Pi, or buy it separately.

Warnings:

  • The 4-20 mA Board is not designed to supply industrial devices such as PLC's and thermostats. It must be used only to supply sensors.
  • If you are going to use the 4-20 mA Board with Raspberry Pi, you must supply your sensors with your own power supply.
  • The 4-20 mA board uses the digital 5 pin to enable/disable the 24 V output.
  • In Arduino and Raspberry Pi, the analog pins 5 and 4 are used by the i2c bus, so it is not possible to use them at the same time.

Related Tutorials

The 4-20 mA Current Loop Board is one of the most robust sensor signaling standard. Current loops are ideal for data transmission because of their inherent insensitivity to electrical noise. In a 4-20 mA current loop, all the signaling current flows through all components; the same current flows even if the wire terminations are less than perfect.

All the components in the loop drop voltage due to the signaling current flowing through them. The signaling current is not affected by these voltage drops as long as the power supply voltage is greater than the sum of the voltage drops around the loop at the maximum signaling current of 20 mA.

The idea behind the Raspberry Pi to Arduino shields connection bridge is to allow to use any of the shields, boards and modules designed for Arduino in Raspberry Pi.

It includes also the possibility of connecting digital and analog sensors, using the same pinout of Arduino but with the power and capabilities of Raspberry.

If you are interested in Internet of Things (IoT) or M2M projects check our open source sensor platform Waspmote which counts with more than 100 sensors available to use 'off the shelf', a complete API with hundreds of ready to use codes and a low consumption mode of just 0.7µA to ensure years of battery life.

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