adafruit_lis3dh
¶
CircuitPython driver for the LIS3DH accelerometer.
See examples in the examples directory.
Author(s): Tony DiCola
Implementation Notes¶
Hardware:
Software and Dependencies:
Adafruit CircuitPython firmware for the supported boards: https://circuitpython.org/downloads
Adafruit’s Bus Device library: https://github.com/adafruit/Adafruit_CircuitPython_BusDevice
- adafruit_lis3dh.AccelerationTuple¶
alias of
acceleration
- class adafruit_lis3dh.LIS3DH(int1=None, int2=None)[source]¶
Driver base for the LIS3DH accelerometer.
- Parameters
int1 (digitalio.DigitalInOut) –
digitalio.DigitalInOut
connected to the LIS3DH INT1 interrupt pinint2 (digitalio.DigitalInOut) –
digitalio.DigitalInOut
connected to the LIS3DH INT2 interrupt pin
- property acceleration¶
The x, y, z acceleration values returned in a 3-tuple and are in \(m / s ^ 2\)
- property data_rate¶
The data rate of the accelerometer.
Could have the following values:
DATA_RATE_400_HZ
DATA_RATE_200_HZ
DATA_RATE_100_HZ
DATA_RATE_50_HZ
DATA_RATE_25_HZ
DATA_RATE_10_HZ
DATA_RATE_1_HZ
DATA_RATE_POWERDOWN
DATA_RATE_LOWPOWER_1K6HZ
DATA_RATE_LOWPOWER_5KHZ.
- property range¶
The range of the accelerometer.
Could have the following values:
RANGE_2_G
RANGE_4_G
RANGE_8_G
RANGE_16_G.
- read_adc_mV(adc)[source]¶
Read the specified analog to digital converter value in millivolts. ADC must be a value 1, 2, or 3. NOTE the ADC can only measure voltages in the range of ~900-1200mV!
- read_adc_raw(adc)[source]¶
Retrieve the raw analog to digital converter value. ADC must be a value 1, 2, or 3.
- set_tap(tap, threshold, *, time_limit=10, time_latency=20, time_window=255, click_cfg=None)[source]¶
The tap detection parameters.
Note
Tap related registers are called
CLICK_
in the datasheet.- Parameters
tap (int) – 0 to disable tap detection, 1 to detect only single taps, and 2 to detect only double taps.
threshold (int) – A threshold for the tap detection. The higher the value the less sensitive the detection. This changes based on the accelerometer range. Good values are 5-10 for 16G, 10-20 for 8G, 20-40 for 4G, and 40-80 for 2G.
time_limit (int) – TIME_LIMIT register value. Defaults to
10
time_latency (int) – TIME_LATENCY register value. Defaults to
20
time_window (int) – TIME_WINDOW register value. Defaults to
255
click_cfg (int) – CLICK_CFG register value.
- shake(shake_threshold=30, avg_count=10, total_delay=0.1)[source]¶
Detect when the accelerometer is shaken. Optional parameters:
- Parameters
shake_threshold (int) – Increase or decrease to change shake sensitivity. This requires a minimum value of 10. 10 is the total acceleration if the board is not moving, therefore anything less than 10 will erroneously report a constant shake detected. Defaults to
30
avg_count (int) – The number of readings taken and used for the average acceleration. Default to
10
total_delay (float) – The total time in seconds it takes to obtain avg_count readings from acceleration. Defaults to
0.1
- property tapped¶
True if a tap was detected recently. Whether its a single tap or double tap is determined by the tap param on
set_tap
.tapped
may be True over multiple reads even if only a single tap or single double tap occurred if the interrupt (int) pin is not specified.The following example uses
board.I2C
and specifies the interrupt pin:import adafruit_lis3dh import digitalio import board i2c = board.I2C() # uses board.SCL and board.SDA int1 = digitalio.DigitalInOut(board.D11) # pin connected to interrupt lis3dh = adafruit_lis3dh.LIS3DH_I2C(i2c, int1=int1) lis3dh.range = adafruit_lis3dh.RANGE_8_G
- class adafruit_lis3dh.LIS3DH_I2C(i2c, *, address=24, int1=None, int2=None)[source]¶
Driver for the LIS3DH accelerometer connected over I2C.
- Parameters
i2c (I2C) – The I2C bus the LIS3DH is connected to.
address – The I2C device address. Defaults to
0x18
Quickstart: Importing and using the device
Here is an example of using the
LIS3DH_I2C
class. First you will need to import the libraries to use the sensorimport board import adafruit_lis3dh
Once this is done you can define your
board.I2C
object and define your sensor objecti2c = board.I2C() # uses board.SCL and board.SDA lis3dh = adafruit_lis3dh.LIS3DH_I2C(i2c)
Now you have access to the
acceleration
attributeacc_x, acc_y, acc_z = lis3dh.acceleration
- class adafruit_lis3dh.LIS3DH_SPI(spi, cs, *, baudrate=100000, int1=None, int2=None)[source]¶
Driver for the LIS3DH accelerometer connected over SPI.
- Parameters
i2c (I2C) – The I2C bus the LIS3DH is connected to.
address – The I2C device address. Defaults to
0x18
Quickstart: Importing and using the device
Here is an example of using the
LIS3DH_SPI
class. First you will need to import the libraries to use the sensorimport board import adafruit_lis3dh
Once this is done you can define your
board.SPI
object and define your sensor objecti2c = board.SPI() lis3dh = adafruit_lis3dh.LIS3DH_SPI(spi)
Now you have access to the
acceleration
attributeacc_x, acc_y, acc_z = lis3dh.acceleration