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ESP32 Hall Sensor: Master Beginner-Friendly Guide with Tips, Projects, and Code Examples

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By Raj Kumar
On: November 20, 2025
ESP32 Hall Sensor

Table of Contents

Learn ESP32 hall sensor basics, wiring, code, projects, RPM measurement, and Home Assistant integration in this complete beginner-friendly guide.

Whether you’re tinkering with embedded electronics or exploring IoT projects, the ESP32 hall sensor is a fantastic tool for detecting magnetic fields without touching the source. Today, we’ll take a deep dive into everything you need to know: how it works, wiring, code, projects, and tips for using it in real-world applications. Grab your coffee, and let’s explore ESP32 hall sensor tutorials like a pro.

Introduction and Basics

Welcome to your journey with the ESP32 hall sensor. In this guide, we’ll start from the very basics — what a hall sensor is, how it works on the ESP32, and why it’s so useful for makers and IoT enthusiasts.

1. What is a Hall Sensor?

A hall effect sensor detects magnetic fields. When a magnet comes near, it generates a voltage proportional to the magnetic field strength. This property allows hall sensors to:

  • Detect magnet presence or proximity
  • Measure rotational speed (RPM)
  • Sense current in a wire (via hall effect current sensors)

2. Does ESP32 Have a Hall Effect Sensor?

Yes! The ESP32 comes with a built-in internal hall sensor. You can use it to detect magnets without adding extra hardware. Additionally, external hall sensors can be connected for more precision or different placement in your project.

3. Internal vs External Hall Sensor

FeatureInternal Hall SensorExternal Hall Sensor
Hardware RequiredNoneYes (digital/analog sensor)
Wiring ComplexityMinimalRequires VCC, GND, OUT
AccuracyModerateHigh
Use CasesSimple magnet detectionRPM measurement, current sensing, multi-sensor projects

4. ESP32 Hall Sensor Pins

The internal hall sensor doesn’t need a specific GPIO pin — you can read it using hallRead() in Arduino IDE.
For external hall sensors, wiring typically looks like:

  • VCC → 3.3V
  • GND → GND
  • OUT → GPIO pin (digital or analog depending on sensor type)

5. Basic Arduino Code for Internal Hall Sensor

void setup() {
  Serial.begin(115200);
}

void loop() {
  int hallValue = hallRead();
  Serial.println("Hall Value: " + String(hallValue));
  delay(500);
}

Explanation:

  • hallRead() returns a value representing the magnetic field strength.
  • Positive/negative changes indicate the presence and polarity of a magnet.

6. Why Use ESP32 Hall Sensor?

The ESP32 hall sensor is useful because it’s:

  1. Cost-effective: Internal sensor requires no extra hardware.
  2. Versatile: Can detect magnets, measure RPM, or monitor current.
  3. IoT-ready: Combine with Wi-Fi and Bluetooth for smart home projects.

7. ESP32 Hall Sensor Use Cases

  • RPM Measurement: Count rotations of motors using an external hall sensor.
  • Magnet Detection: Detect doors/windows or moving objects.
  • Current Sensing: Measure current with a hall effect current sensor.
  • Smart Home Automation: Combine with ESPHome or Home Assistant for alerts.

Wiring, Connections, and Interrupts

Now that we’ve covered the basics and the built-in hall sensor in Part 1, let’s move on to practical wiring, using external hall effect sensors, and leveraging interrupts for responsive applications. Whether you’re building a motor RPM counter, door sensor, or a current monitor, this part will guide you step by step.

1. ESP32 Hall Sensor Wiring

A. Using the Internal Hall Sensor

The ESP32 built-in hall sensor is already connected to the chip. You don’t need any extra wires. All you need is to call hallRead() in your Arduino IDE or MicroPython script to get readings.

B. Using an External Hall Sensor

If you need higher accuracy or want to measure stronger magnetic fields, you can use an external hall effect sensor.

Step-by-step wiring:

Hall Sensor PinESP32 PinNotes
VCC3.3VProvide 3.3V power
GNDGNDCommon ground
OUTGPIO 4Digital output to read sensor signal

Tips:

  1. Make sure the sensor is 3.3V compatible.
  2. Use short wires to reduce interference.
  3. Add a pull-up resistor (10kΩ) if required by your sensor.

2. Using ESP32 Hall Sensor with Interrupts

Interrupts allow your ESP32 to react instantly when a magnetic field is detected, without constantly polling the sensor. This is useful for applications like:

  • Motor RPM counting
  • Door open/close sensors
  • Event logging

Arduino IDE Example – Hall Sensor Interrupt

volatile int pulseCount = 0;

void IRAM_ATTR countPulse() {
  pulseCount++;
}

void setup() {
  Serial.begin(115200);
  // Connect your external sensor output to GPIO 4
  pinMode(4, INPUT);
  attachInterrupt(digitalPinToInterrupt(4), countPulse, RISING);
}

void loop() {
  int rpm = (pulseCount * 60) / 2; // Assuming 2 pulses per revolution
  Serial.println("RPM: " + String(rpm));
  pulseCount = 0;
  delay(1000);
}

Explanation:

  • attachInterrupt() monitors the pin for a rising edge.
  • Every time the sensor detects a magnet, the ISR (countPulse) is called.
  • pulseCount tracks the number of pulses for RPM calculation.

MicroPython Example – Interrupt

from machine import Pin
import time

pulse_count = 0

def count_pulse(pin):
    global pulse_count
    pulse_count += 1

sensor_pin = Pin(4, Pin.IN)
sensor_pin.irq(trigger=Pin.IRQ_RISING, handler=count_pulse)

while True:
    print("Pulse count:", pulse_count)
    pulse_count = 0
    time.sleep(1)

3. Internal vs External Hall Sensors

FeatureInternal Hall SensorExternal Hall Sensor
AccuracyModerateHigh
WiringNo external wiring requiredRequires VCC, GND, OUT pins
Use CasesSimple projects, testingRPM counters, precise detection
Power ConsumptionLowDepends on sensor model

4. Common Projects Using External Hall Sensors

  1. Motor RPM Measurement
    • Attach a small magnet to the motor shaft.
    • Count pulses using interrupts.
  2. Magnetic Door/Window Sensor
    • Use hall sensor to detect magnet movement.
    • Trigger notifications in Home Assistant with ESPHome ESP32 hall sensor.
  3. Current Sensing
    • Place the wire carrying current near the hall effect sensor.
    • Detect magnetic field proportional to current.
  4. Smart Gadgets
    • Combine ESP32 touch sensor example and hall sensor for interactive applications.

5. Wiring Tips for Stable Readings

  1. Avoid placing the sensor near high-current wires or motors unless needed.
  2. Keep wires short and twisted if possible to reduce noise.
  3. For digital output hall sensors, use pull-up resistors (typically 10kΩ).
  4. If your ESP32 readings fluctuate, consider using software debouncing.

6. ESP32 Hall Sensor Removed / Disabling Sensor

Sometimes you may want to disable the hall sensor:

  • Simply avoid calling hallRead() in your code.
  • Internal sensors consume minimal power, so removal is usually not necessary.

Real Projects & Step-by-Step Examples

Now that we’ve covered wiring, internal vs external sensors, and interrupts, it’s time to put theory into practice. In this part, we’ll explore hands-on ESP32 hall sensor projects for beginners and enthusiasts. You’ll see how to build useful applications like RPM counters, magnetic door sensors, current sensing, and smart IoT integrations.

1. Motor RPM Measurement Using ESP32 Hall Sensor

Measuring rotational speed (RPM) of a motor is one of the most common uses of a hall sensor. Let’s see how to implement it with an external hall effect sensor.

Components Required

  • ESP32 development board
  • Hall effect sensor (digital output)
  • Small magnet
  • Jumper wires

Wiring

  1. VCC → 3.3V on ESP32
  2. GND → GND
  3. OUT → GPIO 4

Place the magnet on the rotating shaft so that it passes near the sensor once per rotation.

Arduino IDE Code Example

volatile int pulseCount = 0;

void IRAM_ATTR countPulse() {
  pulseCount++;
}

void setup() {
  Serial.begin(115200);
  pinMode(4, INPUT);
  attachInterrupt(digitalPinToInterrupt(4), countPulse, RISING);
}

void loop() {
  int rpm = (pulseCount * 60) / 1; // 1 pulse per rotation
  Serial.println("Motor RPM: " + String(rpm));
  pulseCount = 0;
  delay(1000);
}

Explanation:

  • Every time the magnet passes the hall sensor, an interrupt triggers.
  • We count pulses per second and convert to RPM.

2. Magnetic Door/Window Sensor

Using a hall sensor, you can detect whether a door or window is open or closed. This is ideal for smart home automation.

Components

  • ESP32
  • Small hall effect sensor
  • Magnet
  • Jumper wires

Wiring

  • Connect the hall sensor as per standard ESP32 hall sensor wiring.
  • Place the magnet on the door/window and the sensor on the frame.

Arduino IDE Code

const int sensorPin = 4;
int state = 0;

void setup() {
  Serial.begin(115200);
  pinMode(sensorPin, INPUT);
}

void loop() {
  state = digitalRead(sensorPin);
  if (state == HIGH) {
    Serial.println("Door closed");
  } else {
    Serial.println("Door opened");
  }
  delay(500);
}

Optional: Integrate with Home Assistant using ESPHome ESP32 hall sensor configuration to receive notifications when doors open or close.

3. Hall Effect Current Sensor with ESP32

You can use a hall effect sensor to measure current passing through a wire. This is useful in power monitoring or DIY energy projects.

Wiring

  1. Place a current-carrying wire near the sensor.
  2. Connect VCC to 3.3V, GND to GND, and OUT to an analog pin on ESP32 (for analog hall sensors).

Arduino Code Example

const int hallPin = 34; // Analog pin
int hallValue = 0;

void setup() {
  Serial.begin(115200);
}

void loop() {
  hallValue = analogRead(hallPin);
  float current = (hallValue / 4095.0) * 3.3; // Convert ADC to voltage
  Serial.println("Current reading: " + String(current) + " V");
  delay(500);
}

Tip: Calibrate readings with known currents for accurate measurement.

4. Smart IoT Gadgets with ESP32 Hall Sensor

Combine the ESP32 internal hall sensor or an external sensor with other ESP32 peripherals:

  • Touch Sensor Combo: Detect touch and magnet presence to trigger smart actions.
  • Temperature Sensor Combo: Combine hall sensor with ESP32 temperature sensor code to monitor environmental conditions alongside magnetic events.
  • MicroPython Projects: Use MicroPython for quick prototyping:
from machine import Pin
import esp32
import time

while True:
    hall_value = esp32.hall_sensor()
    print("Hall Value:", hall_value)
    time.sleep(0.5)

5. Advanced Projects Ideas

  1. Rotating Platform with RPM Display
    • Measure rotations and display RPM on OLED or LCD.
  2. Automated Door Lock
    • Detect magnet to allow smart unlocking.
  3. Motor Current Monitoring
    • Combine hall effect current sensor with logging for motor diagnostics.
  4. Interactive Art Installation
    • Detect magnet movement to trigger LED sequences or sounds.

6. Wiring Best Practices for Projects

  • Keep sensor wires short and away from high-power circuits.
  • For analog sensors, use shielded wires to prevent noise.
  • For interrupts, always use IRAM_ATTR in Arduino IDE for ISR functions.
  • Use ESP32 hall sensor pin carefully – avoid using pins with conflicts.

Advanced Techniques & Optimization

By now, you’re comfortable with wiring, basic projects, and interrupts. In Part 4, we’ll go deeper into calibrating the hall sensor, advanced coding techniques, combining multiple sensors, and optimizing performance for real-world applications.

1. Calibrating ESP32 Hall Sensor

Calibration is important to ensure accurate magnetic field readings. Both internal and external hall sensors may have offsets or noise.

Steps for Calibration

  1. Read the baseline value without any magnets nearby:
int baseline = hallRead();
Serial.println("Baseline Value: " + String(baseline));
  1. Subtract the baseline from all readings:
int hallValue = hallRead() - baseline;
Serial.println("Calibrated Value: " + String(hallValue));
  1. Optionally, average multiple readings to reduce noise:
int sum = 0;
for (int i = 0; i < 10; i++) {
    sum += hallRead();
}
int avgValue = sum / 10;
Serial.println("Average Hall Value: " + String(avgValue));

Tip: External hall sensors may require current or voltage calibration depending on your project, like RPM or current sensing.

2. Advanced Interrupt Handling

Using ESP32 Hall Sensor Interrupts Efficiently

  • Avoid heavy processing inside the ISR (Interrupt Service Routine).
  • Only update counters or flags; handle logic in the main loop.

Example – Optimized RPM Counting

volatile int pulseCount = 0;

void IRAM_ATTR countPulse() {
  pulseCount++; // Only increment counter
}

void setup() {
  Serial.begin(115200);
  pinMode(4, INPUT);
  attachInterrupt(digitalPinToInterrupt(4), countPulse, RISING);
}

void loop() {
  static int lastCount = 0;
  int rpm = (pulseCount - lastCount) * 60; // simple RPM calculation
  lastCount = pulseCount;
  Serial.println("RPM: " + String(rpm));
  delay(1000);
}

3. Combining Multiple Sensors

Hall Sensor + Touch Sensor

  • Detect magnetic presence and user touch together for interactive gadgets.

Arduino Example:

const int hallPin = 4;
const int touchPin = T0; // ESP32 touch pin
void setup() {
  Serial.begin(115200);
}
void loop() {
  int hallVal = hallRead();
  int touchVal = touchRead(touchPin);
  Serial.println("Hall: " + String(hallVal) + " Touch: " + String(touchVal));
  delay(500);
}

Hall Sensor + Temperature Sensor

  • Monitor environmental conditions alongside magnetic events.
#include "DHT.h"
#define DHTPIN 5
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
}

void loop() {
  int hallVal = hallRead();
  float temp = dht.readTemperature();
  Serial.println("Hall: " + String(hallVal) + " Temp: " + String(temp));
  delay(500);
}

4. Using ESPHome with ESP32 Hall Sensor

ESPHome allows Home Assistant integration without writing complex code.

Example YAML Configuration:

sensor:
  - platform: esp32_hall
    name: "ESP32 Hall Sensor"
    id: hall_sensor
    filters:
      - median:
          window_size: 5
          send_every: 1
  • Easily integrate magnetic events into smart home automation.

5. Advanced Coding Techniques

1. Smoothing Readings

  • Use a moving average to reduce sensor noise:
#define WINDOW 10
int readings[WINDOW];
int index = 0;

void loop() {
  readings[index] = hallRead();
  index = (index + 1) % WINDOW;

  int sum = 0;
  for (int i = 0; i < WINDOW; i++) sum += readings[i];
  int avg = sum / WINDOW;

  Serial.println("Smoothed Hall Value: " + String(avg));
  delay(200);
}

2. Threshold Detection

  • Trigger actions when hall readings exceed a threshold:
int threshold = 50;
int hallVal = hallRead();
if (hallVal > threshold) {
    Serial.println("Magnet Detected!");
}

6. Multi-Magnet and Multi-Sensor Setup

For larger projects like conveyor belts or robotics:

  • Place multiple magnets along the path.
  • Use ESP32 hall sensor pins to read each sensor individually.
  • Combine readings for position tracking or counting objects.

Troubleshooting, FAQs, and Final Tips

You’ve learned about internal and external hall sensors, wiring, projects, interrupts, and advanced techniques. In this final part, we’ll consolidate everything with common troubleshooting tips, FAQs, and expert guidance to help you become confident in using ESP32 hall sensors for any project.

The ESP32 hall sensor is a versatile tool for detecting magnetic fields, counting rotations, or building smart home devices. However, beginners and even experienced developers often face challenges. This guide will cover all common problems, causes, and solutions for the ESP32 hall sensor, including both internal and external sensors.

1. No Readings from Internal Hall Sensor

Problem

When calling hallRead(), the ESP32 returns zero or constant values.

Possible Causes

  • Code not calling hallRead() correctly.
  • ESP32 is defective (rare).
  • Noise interference masking the signal.

Solution

  • Use correct Arduino IDE or MicroPython code:
int hallValue = hallRead();
Serial.println("Hall Value: " + String(hallValue));
  • Place the ESP32 away from motors, high-power devices, or magnets that may saturate the sensor.
  • Reset the ESP32 and test again.

2. External Hall Sensor Not Detected

Problem

Your external hall effect sensor is wired but doesn’t respond when a magnet is nearby.

Possible Causes

  • Incorrect wiring (VCC, GND, OUT).
  • Sensor incompatible with 3.3V ESP32 logic.
  • Weak or misaligned magnet.

Solution

  • Check wiring: VCC → 3.3V, GND → GND, OUT → GPIO.
  • Ensure the sensor is 3.3V compatible.
  • Use a stronger magnet or adjust distance.
  • For digital sensors, consider adding a 10kΩ pull-up resistor.

3. Fluctuating or Noisy Readings

Problem

Hall sensor readings jump randomly or fluctuate even without a magnet nearby.

Possible Causes

  • Electrical noise from motors, LEDs, or power supplies.
  • Long unshielded wires causing interference.
  • Sensor not calibrated.

Solution

  1. Keep wires short and twisted.
  2. Use software filtering, such as moving average:
#define WINDOW 10
int readings[WINDOW];
int index = 0;
for(int i=0;i
  1. Calibrate by finding a baseline with no magnet and subtracting it from readings.

4. Interrupts Not Triggering

Problem

Your ESP32 hall sensor connected to a GPIO pin with attachInterrupt() does not trigger on magnetic events.

Possible Causes

  • Wrong GPIO pin used.
  • Incorrect interrupt type (RISING, FALLING, CHANGE).
  • Heavy processing inside ISR blocking execution.

Solution

  • Verify GPIO pin is suitable for interrupts.
  • Use attachInterrupt(digitalPinToInterrupt(pin), ISR, RISING); for digital output sensors.
  • Keep the ISR light; only increment counters or set flags.
volatile int count = 0;
void IRAM_ATTR sensorISR() {
  count++;
}
attachInterrupt(digitalPinToInterrupt(4), sensorISR, RISING);

5. RPM Measurements Are Inaccurate

Problem

ESP32 hall sensor counts motor RPM incorrectly.

Possible Causes

  • Weak magnet or misaligned position.
  • Noise causing false pulses.
  • Incorrect formula for converting pulses to RPM.

Solution

  • Ensure the magnet is strong and positioned to trigger each rotation.
  • Use software filtering to ignore small fluctuations.
  • Calculate RPM accurately:
int rpm = (pulseCount * 60) / pulsesPerRevolution;

6. Home Assistant Integration Issues

Problem

ESP32 hall sensor data does not appear in Home Assistant using ESPHome.

Possible Causes

  • Incorrect YAML configuration.
  • ESP32 not connected to Wi-Fi.
  • Sensor not assigned a proper platform in ESPHome.

Solution

  • Example ESPHome YAML configuration:
sensor:
  - platform: esp32_hall
    name: "ESP32 Hall Sensor"
    id: hall_sensor
    filters:
      - median:
          window_size: 5
          send_every: 1
  • Verify ESP32 is online and Wi-Fi credentials are correct.

7. Sensor Calibration Issues

Problem

Your hall sensor readings are off or inconsistent.

Possible Causes

  • Sensors have manufacturing offsets.
  • Environmental magnetic fields affecting the sensor.

Solution

  • Take multiple readings with no magnetic field:
int baseline = 0;
for(int i=0;i<20;i++) baseline += hallRead();
baseline /= 20;
  • Subtract baseline from all future readings.

8. Weak Magnet Detection

Problem

ESP32 hall sensor cannot detect your magnet reliably.

Possible Causes

  • Magnet too small or too far from the sensor.
  • Sensor sensitivity too low.

Solution

  • Use a stronger neodymium magnet.
  • Place the magnet closer to the sensor.
  • Adjust code to handle lower threshold values:
if(hallRead() > threshold) Serial.println("Magnet Detected");

9. Multiple Sensors Conflicting

Problem

Using multiple hall sensors on ESP32 causes interference or inaccurate readings.

Possible Causes

  • Pins share interrupts or are not suitable for multiple sensors.
  • Crosstalk between sensor wires.

Solution

  • Assign different GPIO pins to each sensor.
  • Use shielded cables or keep wires apart.
  • Handle each sensor in its own ISR or polling loop.

Advanced Tips for Reliable Performance

  1. Calibrate Your Sensor:
    Subtract baseline readings to remove offsets.
  2. Use Interrupts Wisely:
    Only increment counters or set flags in ISR; handle logic in the main loop.
  3. Filter Data:
    Use moving average or median filters to reduce noise.
  4. Combine Sensors for Complex Projects:
    Integrate with touch sensors (esp32 touch sensor example) or temperature sensors (esp32 temperature sensor code) for enhanced functionality.
  5. Shield External Sensors:
    Keep wires away from motors, power lines, or electromagnetic sources.

ESP32 Hall Sensor – Frequently Asked Questions (FAQs)

1. Does the ESP32 have a hall effect sensor?

Yes, the ESP32 features a built-in internal hall sensor that can detect magnetic fields. This sensor allows developers to measure proximity to magnets, detect rotation, or use it for basic DIY projects without additional hardware.

2. What is the difference between internal and external hall sensors on ESP32?

  • Internal hall sensor: Built-in, easy to use, minimal wiring, moderate accuracy.
  • External hall sensor: Separate hardware, high accuracy, can measure higher currents or RPMs, requires wiring (VCC, GND, OUT).

3. How do I read the internal hall sensor on ESP32?

In Arduino IDE:

int hallValue = hallRead();
Serial.println(hallValue);
  • Returns an integer representing the magnetic field strength.
  • In MicroPython:
import esp32
hall_value = esp32.hall_sensor()
print(hall_value)

4. How do I connect an external hall sensor to ESP32?

  • VCC → 3.3V
  • GND → GND
  • OUT → GPIO pin (digital or analog depending on the sensor)
  • Optional: Add a 10kΩ pull-up resistor for digital sensors.

5. Can I use ESP32 hall sensor to measure motor RPM?

Yes! By placing a magnet on a rotating shaft and using an external hall sensor, you can detect each rotation. Use interrupts to count pulses and calculate RPM:

volatile int pulseCount = 0;
void IRAM_ATTR countPulse() { pulseCount++; }
attachInterrupt(digitalPinToInterrupt(4), countPulse, RISING);

6. How do I integrate ESP32 hall sensor with Home Assistant?

Using ESPHome, you can integrate ESP32 hall sensors as smart home sensors. Example YAML configuration:

sensor:
  - platform: esp32_hall
    name: "ESP32 Hall Sensor"
    id: hall_sensor
    filters:
      - median:
          window_size: 5
          send_every: 1

7. Why are my ESP32 hall sensor readings unstable?

Common causes:

  • Electrical noise from motors or high-power circuits.
  • Long or unshielded wires.
  • Weak or misaligned magnet.
    Solutions:
  • Shorten/shield wires.
  • Use software filtering (moving average or median filter).
  • Place a stronger magnet closer to the sensor.

8. Can the ESP32 hall sensor detect current?

Yes, with an external hall effect current sensor placed near a current-carrying wire. The sensor measures the magnetic field generated by the current. Use analog read to get current levels.

9. Can ESP32 hall sensor work with touch sensors?

Yes! You can combine the hall sensor with ESP32 touch sensors for interactive projects. Example: detect magnet presence and touch simultaneously:

int hallVal = hallRead();
int touchVal = touchRead(T0);

10. How do I calibrate an ESP32 hall sensor?

Calibration ensures accurate readings. Steps:

  1. Take multiple readings without a magnet to find baseline.
  2. Subtract baseline from all subsequent readings.
  3. Optionally, average multiple readings to reduce noise.

11. How to remove or disable the internal hall sensor?

If you don’t need the internal hall sensor, simply stop calling hallRead() in your code. It consumes minimal power when unused.

12. How many hall sensors can I use on one ESP32?

You can connect multiple external hall sensors on different GPIO pins. Use separate interrupts or polling loops to handle multiple inputs. Keep wires short and shielded to avoid crosstalk.

13. Can I use MicroPython with ESP32 hall sensor?

Yes! MicroPython provides esp32.hall_sensor() to read the internal hall sensor value. It’s perfect for rapid prototyping

14. Can hall sensors detect polarity of a magnet?

Yes. ESP32 internal hall sensor returns positive or negative values depending on the north or south pole of the magnet

15. Can ESP32 hall sensors be used in IoT projects?

Absolutely! Combine ESP32 hall sensors with Wi-Fi or Bluetooth to:

  • Monitor doors/windows
  • Measure motor RPM remotely
  • Detect magnetic objects
  • Integrate with ESPHome or Home Assistant

Combining Sensors for Smart Projects

Advanced projects can combine hall sensors with other sensors:

  • Smart doors and windows: Hall + ESPHome + Home Assistant.
  • Motor monitoring: Hall sensor + temperature sensor for motor health monitoring.
  • Interactive gadgets: Hall sensor + touch sensor for creative IoT applications.

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