Produced by the Analog Devices (AD), it is an ultra-low power 3 axis-accelerometer being capable of high-resolution measurements up to ± 16g. If you plan to measure just the Earth’s gravity then ± 2g can be enough for you. For a car movement, ± 4g will be fine but if you want to track an object that suddenly stops you will need ± 16g:
The ADXL345 can be connected to the ESP8266 over SPI or I2C lines. In our case, we will use the I2C connection. The bus address on which the accelerometer will respond is 0x53.
|
Pin |
Description |
|
GND |
Connect to the ground |
|
VCC |
VCC 3V3. Some modules accept 5V since they have a voltage drop to 3V3 |
|
CS |
Chip select. High for I2C and LOW for SPI connection to ESP8266 |
|
INT1 |
Programmable interrupt |
|
INT2 |
Programmable interrupt |
|
SDO |
Serial data out for SPI. For I2C select the bus address |
|
SDA |
Serial data for I2C |
|
SCL |
Serial clock signal |