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Nov 08, 2017, 07:52 AM
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Non intrusive 200A SBUS2/S-PORT current sensor


New small project, found some nice small inductive current sensors WCS1500 on aliexpress :-)
There are also other vision for less current 1600 to 1800 as I see it.

So I created a small test PCB with the atmega328PB that made it easy for me to create different versions
of this current sensor for SBUS2 ( inverted serial ), S-PORT ( normal serial ).

Need to still finish a first version to test it. But it will produce current and capacity telemetry data.
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Nov 10, 2017, 04:08 PM
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Do you get just the sensor and build your own PCB, or did you find a module with a WCS1500 and the electronics? If the latter, could you provide a link, please?
Nov 10, 2017, 05:43 PM
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this PCB is my design, most likely i need a second version to remove design bugs,

But I am making the software now, first get some readings, then combine it with my sbus2 library.
Nov 11, 2017, 12:06 AM
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Sounds like an interesting project. Good luck with it!
Nov 12, 2017, 08:45 AM
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And working,

Non-Invasive inductive SBUS2 200A current sensor (0 min 59 sec)

Ok, PCB needs a small change, because now it only goose to ~120A.
Forgot to calculate the voltage values at 200A.
200A * 11mV = 2.2 volt.
0A = 1/2vvd = 1.65V and I used 3.3 volt
0A = 1.65 volt + 2.2V = 3.85 that is above my voltage reference of 3.3V.

Still need to figure out how to simply fix it probably a 5V voltage regulator beside the 3.3V, to uses for the sensor and Vref.
Need to have the 3.3V for the microelectronic because the SBUS2 signal is 3.3V
Nov 12, 2017, 09:41 AM
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I guess is 200 A * 11 mOhms ... else Amps * Volts give Watts

What are 11 mO, a shunt ? isn't this sensor Hall based, thus output voltage directly ?
Nov 12, 2017, 02:33 PM
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11mV per amp is the sensitivity of the sensor.
Nov 13, 2017, 02:06 AM
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Ah, should think more before posting ...
What about pass the sensor output voltage through an opamp as a level shifter ?
Nov 13, 2017, 03:27 AM
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I will use 5V for the sensors, and use a simple 70% voltage divider ( 1% resistors ) to get it in the 0 to 3.3 volt range.
I need to do this because the atmega328 doesn't like high AVCC and AREF then the VCC of the digital part.
Nov 14, 2017, 08:37 AM
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pierrotm777's Avatar
Very nice project !!!
Nov 16, 2017, 02:33 PM
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still difficult to print small stuf

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