Wemos Mini and L3GD20 sensor

The L3GD20 is a low-power three-axis angular rate sensor. This is the module I bought for reference

More information can be found at http://www.st.com/content/st_com/en/products/mems-and-sensors/gyroscopes/l3gd20.html about the sensor

l3gd20

 

Features

  • Three selectable full scales (250/500/2000 dps)
  • I2 C/SPI digital output interface
  • 16 bit-rate value data output
  • 8-bit temperature data output
  • Two digital output lines (interrupt and data ready)
  • Integrated low- and high-pass filters with user-selectable bandwidth
  • Wide supply voltage: 2.4 V to 3.6 V
  • Low voltage-compatible IOs (1.8 V)
  • Embedded power-down and sleep mode
  • Embedded temperature sensor
  • Embedded FIFO
  • High shock survivability

 

Here is a schematic showing the module I had.

l3gd20-600

 

Connection

 

Wemos Mini Connection GY-50 L3GD20 connection
3v3 Vcc
Gnd Gnd
SDA – Wemos D2 SDA
SCL – Wemos D1 SCL

 

Code

I managed to find the following library that seemed to work well – https://github.com/pololu/l3g-arduino

This is the test example

#include <Wire.h>
#include <L3G.h>
 
L3G gyro;
 
void setup() {
  Serial.begin(9600);
  Wire.begin();
 
  if (!gyro.init())
  {
    Serial.println("Failed to autodetect gyro type!");
    while (1);
  }
 
  gyro.enableDefault();
}
 
void loop() {
  gyro.read();
 
  Serial.print("G ");
  Serial.print("X: ");
  Serial.print((int)gyro.g.x);
  Serial.print(" Y: ");
  Serial.print((int)gyro.g.y);
  Serial.print(" Z: ");
  Serial.println((int)gyro.g.z);
 
  delay(100);
}

 

Links

You can pick up one these sensors for about $4

L3GD20 3-axis Gyroscope Sensor replace L3G4200D Angular velocity module

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