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by rork69
Tue Jan 23, 2018 5:20 pm
Forum: General discussion
Topic: ACS712 30A, zero current problem
Replies: 10
Views: 1859

Re: ACS712 30A, zero current problem

Omarlim thanks!

You have reason also because I measured sensitivity and it seems 150mV/A, similar to 713. Vout at A=0 is Vcc*0.1.
I Also measured a sort of reverse sensitivity and it seems 40mV/A.

But how could it be possible?
In the IC I read: ACS712T ELC-30A 16329

Thanks!
by rork69
Mon Jan 22, 2018 8:59 pm
Forum: General discussion
Topic: ACS712 30A, zero current problem
Replies: 10
Views: 1859

Re: ACS712 30A, zero current problem

I can connect the sensor to my AD converter (waveshare) successfully.
But I can measure correctly only when current go in one direction (volts raise from 0.5v) not in the opposte: the output is not symmetric.
by rork69
Sat Jan 20, 2018 11:32 pm
Forum: General discussion
Topic: ACS712 30A, zero current problem
Replies: 10
Views: 1859

Re: ACS712 30A, zero current problem

If i short or open the input, the result is the same.
I bougth 4 differenti chip from two different suppliers but the result is same :(
by rork69
Sat Jan 20, 2018 9:18 pm
Forum: General discussion
Topic: ACS712 30A, zero current problem
Replies: 10
Views: 1859

Re: ACS712 30A, zero current problem

Yes, i measured the voltage in the chip (the output is directly connected) and the 5v are correctly supplied to the chip.
This is the schema:
http://www.electroschematics.com/wp-con ... ircuit.jpg
Thanks
by rork69
Fri Jan 19, 2018 8:10 pm
Forum: General discussion
Topic: ACS712 30A, zero current problem
Replies: 10
Views: 1859

Re: ACS712 30A, zero current problem

yes, I tried in different sites
by rork69
Fri Jan 19, 2018 4:17 pm
Forum: General discussion
Topic: ACS712 30A, zero current problem
Replies: 10
Views: 1859

ACS712 30A, zero current problem

Hi all. I bougth some ACS712 30A of various brand and I want to connect to my pi3 using an AD converter. If I connect Vcc and Gnd to a 5v source, without any load, I expect to measure Output-Gnd a value of 2.5V (Vcc/2). My problem is that with voltmeter of my tester (great impedence) I measure only ...

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