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Chip: ACS712ELC-5A / ACS712ELC-20A / ACS712ELC-30A
Potencia de alimentación: 5 V.
Rango de medición: 5 A / 20 A 30 A.
Salida analógica: 200 mv/A.
Cuando no hay corriente de detección, el voltaje de salida es VCC / 2
Dimensiones de la placa PCB: 31 x 13 mm.
El paquete incluye:
Detector de módulo de sensor de corriente ACS712 2 unidades
Paul E. Stevenson
Comentado en los Estados Unidos el 21 de marzo de 2025
While my circuit requirements are very basic, this sensor did not achieve them. I need to detect when the connection is open and current flow is off, when there is a "low" power connection with current under 20mA, and when there is a "high" power connection with current above 20mA. I chose the 5A sensor hoping it would give the best accuracy in this range. I don't even need accurate values so much as just the ability to distinguish between these three scenarios.In my controller logic, I'm taking about 1-thousand samples and averaging them together to filter out noise. I'm also separately measuring the 5v rail so that I can calibrate the measured sensor readings. And my microcontroller has 12-bit analog inputs, so I have plenty of resolution to distinguish down to about 1mV.What I'm seeing is that anything below about 50mA all looks the same. And there's lots of fluctuation in the readings.Testing with my multimeter, my circuit is drawing a constant 8.24mA, and the readings I've achieved with this sensor are fluctuating anywhere from -21mA to +29mA, a 50mA variance, all within a minute of monitoring (sampling once per second).This is enough variance to confuse my logic into thinking all 3 scenarios have occurred (disconnected, low power, and high power).I also used some longer jumper wires to distance the sensor from other wires, in case the sensor was being influence by nearby electrical fields. While signal consistency and range both improved a small amount, the max variance was still about 43mV, so it wasn't enough to solve the issues.I did confirm that I have the 5A sensor chip. It seems worthless for this type of monitoring. Glad I was able to test this for cheap before incorporating it into my design.
harold hare
Comentado en los Estados Unidos el 19 de marzo de 2025
They are what they are
David W.
Comentado en los Estados Unidos el 30 de enero de 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
Comentado en los Estados Unidos el 14 de junio de 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
Comentado en los Estados Unidos el 13 de mayo de 2023
However, the screw-in connectors are only 10A/15A max rated.
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