MPU6050 vs ADXL345: Accelerometer & Gyro Sensors
One tracks raw tilt, the other tracks tilt and spin. Do you really need all 6 axes of movement?
MPU6050 (6-Axis IMU)
The MPU6050 is a powerhouse 6-axis Inertial Measurement Unit (IMU). It contains a 3-axis accelerometer AND a 3-axis gyroscope on a single chip.
ADXL345 (3-Axis)
The ADXL345 is a classic 3-axis accelerometer. It is great for measuring static tilt, gravity, and sudden impacts.
Specifications Comparison
| Specification | MPU6050 (6-Axis IMU) | ADXL345 (3-Axis) |
|---|---|---|
| Axes | 6-Axis (3 Accel + 3 Gyro) | 3-Axis (3 Accel ONLY) |
| Built-in Processor | DMP (Digital Motion Processor) | None |
| Communication | I2C | I2C and SPI |
| Voltage | 3V - 5V | 3V - 5V |
| Gyro Range | ±250, 500, 1000, 2000 °/s | None |
| Accel Range | ±2, 4, 8, 16 g | ±2, 4, 8, 16 g |
| Price (India) | ₹150 - ₹250 | ₹120 - ₹180 |
MPU6050 (6-Axis IMU)
Pros
- Includes a Gyroscope! Can track rotation and spin dynamically
- Features an onboard Digital Motion Processor (DMP) to do complex math for you (like filtering noise)
- The absolute gold standard for quadcopters and self-balancing robots
- Incredibly accurate when the accelerometer and gyro data are fused together
Cons
- Library math can be heavy for a standard Arduino Uno without using the DMP
- DMP documentation is confusing and primarily relies on reverse-engineered libraries
- Higher power consumption
ADXL345 (3-Axis)
Pros
- Supports both SPI and I2C communication
- Extremely simple to read XYZ raw gravity values
- Built-in tap/double-tap detection and free-fall detection interrupts
- Very low power consumption, ideal for battery-operated pedometers
Cons
- NO GYROSCOPE! It cannot measure spin or twist, only linear acceleration and gravity tilt
- Struggles with dynamic tilt measurement (it gets confused if moving and tilting at the same time)
- Costs almost as much as the MPU6050 but does less
Our Recommendation
Choose the **MPU6050** for drones, self-balancing robots, VR headsets, or anything that rotates or moves quickly through space. Choose the **ADXL345** if you only need to measure static tilt (like a digital level), detect an impact/drop, or build a low-power pedometer.
The Verdict
Generally, you should just buy the MPU6050. The addition of the gyroscope makes it infinitely more useful for modern robotics at barely any extra cost.