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ESP32 with ADXL335 Accelerometer

11-06-2025

🔧 Key Features of ADXL335

Feature	Description
Type	Analog 3-axis accelerometer
Measurement Range	±3 g (g = gravity, approx. 9.81 m/s²)
Power Supply	1.8V to 3.6V
Output Type	Analog voltage
Sensitivity	~300 mV/g (at 3V supply)
Low Power	~350 µA typical
Operating Temp	-40°C to +85°C
Bandwidth	Adjustable via external capacitors

📊 How It Works

The ADXL335 uses a micro-machined structure suspended by springs inside a silicon chip.
As the device accelerates, the structure deflects, changing the capacitance between fixed plates.
This change is converted into an analog voltage signal on each of the X, Y, and Z output pins.

📈 Typical Output

Each axis outputs a voltage that is approximately:

0V to Vcc (depending on acceleration)
At 0g, each axis outputs about Vcc/2
- E.g., for 3.3V Vcc, 0g = ~1.65V
±1g will cause an increase or decrease of about 300 mV from the 0g level.

⚙️ Applications

Tilt sensing
Motion and vibration detection
Gaming and user interface devices
Wearables
Robotics and drones
Automotive crash detection or car alarms

🔌 Connecting ADXL335 to a Microcontroller (e.g., Arduino)

ADXL335 Pin	Arduino
VCC	3.3V
GND	GND
X OUT	A0
Y OUT	A1
Z OUT	A2

📌 Summary

The ADXL335 is a simple, reliable, analog accelerometer.
Ideal for detecting orientation and motion in low-power embedded systems.
Requires an ADC (Analog-to-Digital Converter) to read data (like in Arduino).
Easy to use, but needs calibration for precise results.

HOW TO OPERATE

#define x_out 13 /* connect x_out of module to A1 of UNO board */

#define y_out 12 /* connect y_out of module to A2 of UNO board */

#define z_out 14 /* connect z_out of module to A3 of UNO board */

void setup(void){

Serial.begin(115200); /*Set the baudrate to 115200*/

}

void loop() {

int x, y, z;

x = analogRead(x_out); /* Digital value of voltage on x_out pin */

y = analogRead(y_out); /* Digital value of voltage on y_out pin */

z = analogRead(z_out); /* Digital value of voltage on z_out pin */

Serial.print("x = ");

Serial.print(x);

Serial.print("\t\t");

Serial.print("y = ");

Serial.print(y);

Serial.print("\t\t");

Serial.print("z = ");

Serial.print(z);

Serial.println("");

/*wait a second*/

delay(1000);

}

ESP32 with ADXL335 Accelerometer

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