Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Sensor Type | Hall Effect Current Sensor |
| Available Ranges | 5A, 20A, 30A |
| Operating Voltage | 5V DC |
| Output Sensitivity (5A) | 185 mV/A |
| Output Sensitivity (20A) | 100 mV/A |
| Output Sensitivity (30A) | 66 mV/A |
| Bandwidth | 80 kHz |
| Response Time | 5 µs |
| Isolation Voltage | 2.1 kV RMS |
| Package Type | Breakout Board with Header Pins |
Anonymous
Mar 28, 2026
Rating: 5/5
Ideal for solar monitoring
I am using the 20A version to monitor my small solar panel output. It handles the current spikes well and the isolation gives me peace of mind.
Anonymous
Mar 17, 2026
Rating: 5/5
Compact and effective
Very compact design fits easily into tight enclosures. The 5A model is surprisingly sensitive and great for low-power consumption tracking.
Anonymous
Mar 11, 2026
Rating: 4/5
Good value but needs calibration
The sensor is accurate enough for general use, but you definitely need to calibrate it against a known load for precise measurements. The build quality is solid.
Anonymous
Mar 10, 2026
Rating: 5/5
Perfect for Arduino projects
This module works flawlessly with my Arduino Uno. The calibration was straightforward, and the readings are stable. Great for monitoring battery discharge rates.
Anonymous
Mar 09, 2026
Rating: 5/5
Reliable for student projects
Bought ten of these for our robotics club. They are durable and easy to solder. Students found the documentation online very helpful for integration.
Anonymous
Mar 07, 2026
Rating: 3/5
Works but noisy output
The sensor functions as described, but I noticed some noise in the output signal. I had to add a capacitor to smooth the reading. Otherwise, it's okay for the price.
Q: Does the 30A version overheat at continuous 25A load?
A: The sensor is rated for up to 30A, but running near the maximum limit continuously may cause heating. We recommend ensuring adequate airflow or using a heatsink for loads above 20A.
Q: Can this module measure AC current as well as DC?
A: Yes, the ACS712 sensor can measure both AC and DC current. The output voltage will vary around the VCC/2 baseline depending on the direction and type of current.
Q: Is there a library available for Raspberry Pi?
A: Since this is an analog sensor, it does not connect directly to the digital GPIO of a Raspberry Pi without an ADC (like MCP3008). Once connected via ADC, standard Python libraries for that ADC can be used to read the values.
Q: What is the accuracy tolerance of this sensor?
A: The typical total error is around ±1.5% to ±2% at room temperature, but this can vary slightly based on the specific range (5A, 20A, or 30A) and external electromagnetic interference.
Q: What is the exact pinout for connecting this to an ESP32?
A: Connect the VCC pin to 5V (or 3.3V if your specific board supports it, though 5V is recommended for stability), GND to GND, and the OUT pin to any analog GPIO pin on the ESP32.
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