4-20mA Sensor Brick

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IM140819001 4.jpg

4~20mA Sensor Brick is an electronic brick module that can be used to test electronic current loop from 4mA to 20mA and support type2,3,4 current output. With a 5V to 24V DC-DC power boost convertor, its max current output can be 150mA, which can be for equipment use.

Go shopping 4-20mA Sensor Brick(IM140819001)


  • Compatible with the mainstream 2.54 and 4-pin Grove interface in market
  • Compatible with type2,3,4 electronic current loop
  • With use of M4 standard fixed holes, compatible with M4-standard kits such as Lego and Makeblock.


PCB size 40.6mm X 29mm X 1.6mm
Power supply 5V DC
Compatible interfaces 2.54 4-pin interface and 4-pin Grove interface(1)

Electronic Characteristics

Parameter Min. Typical Max. Unit
Power supply 4.5 5 5.5 VDC
Input measurement current 4 - 20 mA
Output Current(DCDC) - - 150 mA


IM140819001pic1.jpg IM140819001pic2.jpg IM140819001pic3.jpg

Connected CH1 Type 2/3 CH2 Type 2/3
Disconnected CH1 Type4 CH2 Type4

Loop current type

  • Type 2 loop current

Type 2 loop current.jpg

  • Type 3 loop current

Type 3 loop current.jpg

  • Type 4 loop current

Type 4 loop current.jpg

The relationship between output voltage and input current in channel 1,2

In theory, their relationship can be described into this formula:

Vout1 = R1 * Iin1 * 2

Vout2 = R2 * Iin2 * 2


Note: error ±2% in practical test.


  • 1. Upload the demo File:4_20mA_demo.zip into Iteaduino UNO
  • 2. Connect the sensor brick and UNO as following picture. S1->A4 and S2->A5.
  • 3. Measure current loop
When access in type2,3 loop current, please connect JP1 or JP2, both 1In- and 2In- is equal to connecting ground, 1In+ and 2In+ are connected with the current pins to be measured.
When access in type4 loop current, connect the input end to 1In+ or 2In+, the output end to 1In- or 2In-, and unplug JP1 or JP2 simultaneously.