ACS712 Hall Current Sensor 5/20/30 A
by Allegro / module
SKU: PSA-CMP-ACS712
No reviews yetTypical India street price
₹80–₹180
Isolated-ish Hall current for AC/DC motors and inverters in class.
Interface: Analog
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Concept
Current in a PCB trace makes a magnetic field; Hall IC outputs a voltage around Vcc/2.
A little theory
5 A module ≈ 185 mV/A. Zero-current is 2.5 V at 5 V Vcc. Sample many times and average. In the classroom, treat ACS712 Hall Current Sensor 5/20/30 A as a intermediate part using Analog. Typical India street price is about ₹80–₹180. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
analogRead, subtract midpoint, scale by sensitivity. For AC, compute RMS.
Classroom & project use
- Energy monitor demo
- Overcurrent cut-off
- Motor labs
Buying in India
Precautions
- Mains projects need a teacher + isolation transformer
- 5 V analog only
Specifications
| Ranges | 5/20/30A |
| Output | Analog |
| Category | Sensors |
| Difficulty | Intermediate |
| Voltage | 5V analog |
| Interface | Analog |
Pinout
VCC | GND | AO (and DO if comparator module)
