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Chip: ACS712ELC-5A / ACS712ELC-20A / ACS712ELC-30A
Supply Power: 5V
Measuring range: 5A / 20A 30A.
Analog output: 200 mv/A
When there is no the detection current , the output voltage is VCC / 2
PCB board dimension:31x13mm
Package Included:
2pcs ACS712 Current Sensor Module Detector
David W.
Reviewed in the United States on January 30, 2025
These are amazing little devices. They work as designed. I had one problem with my design. These devices output 1/2 of the supply voltage when no current is flowing. Then they output like 100 mv per amp. I would read the output to get the zero-current baseline then try to read current output. My problem was that the supply voltage would go up or down slightly when relays kicked in or LEDs were turned on/off, therefore throwing off the reading. My future designs will have an absolute stable supply voltage or a supply voltage divider to read each time to get zero current voltage level, then read device output to calculate the difference at that moment. This is probably a great product, just a bad design on my part. I felt like I should give a 3 star rating to help people know this before purchasing.
MonkeySue
Reviewed in the United States on June 14, 2024
Product: 2 modules of 5A ACS712Overview: One of 2 modules failed during the initial ("proper voltage w/ zero current") test. The second failed subsequent tests. Many of the electrical characteristics seem out-of-spec. The modules gave only approximation of the current (may or may not be usable, depending on your application). These are only suitable for learning. If you buy, do not expect high accuracy. Report the mean value, calc from 10's-to-100's of measures.Details:Packaging: the product was delivered w/ foam pin protection, inside an anti-state wrapper, inside zip-locked plastic. Neither module was visibly damaged.Quality: I agree w/ prior reviewers-the screw terminal is the design's "achilles heel". It is not correctly sized for wire > 18AWG. The solder connections and the board layout are good.Zero-Current Tests (i.e., module was powered, but zero current flowing): the 1st module had 2.55v (expected 2.5v) at the output pin. Using my arduino's ADC output as a proxy for voltage and taking the mean of 100 measures I found the mean value ranged 514.5-521.3 [I expected 511.5, (ie, 1023/2)]. These values are acceptable. Total current was 13.6mA (within IC specs if the LED's current draw is considered). The same tests performed on module#2 found values well away from the expected values and rather variable (unusable).Accuracy: The datasheet reports IC's accuracy +/- 1.5% (note that this accuracy is @ 5A and 25 degC). I tested at 1A and below. Error was +/- 15% (600-1000mA) to more than 50% (
W.Jager
Reviewed in the United States on May 13, 2023
However, the screw-in connectors are only 10A/15A max rated.
Customer
Reviewed in the United States on March 9, 2021
The board seems to work OK electrically, but the mounting holes are so close to components that they are unusable.
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