Hello everyone,
I'm stuck and I need some help. I have the LIS2HH12 accelerometer connected to my raspberry pi via SPI. So far, I have been able to collect real-time accelerometer data . But my goal is to only get data once the accelerometer is titled or moved(I've noticed that z goes to less than 0.7g when tilted). I'm trying to program the INT1 pin to send a high or low signal to my gpio once movement is detected. But so far, I've failed.
Here's my code, if anyone can please look at it and help a desperate PhD student I would be very thankful!
import spidev
import RPi.GPIO as GPIO
import time
# SPI Configuration
spi = spidev.SpiDev()
spi.open(0, 0) # Bus 0, Device 0
spi.max_speed_hz = 10000000 # 10 MHz
spi.mode = 0b11
# GPIO Configuration
INT_PIN = 22
GPIO.setmode(GPIO.BCM)
GPIO.setup(INT_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)
# Register addresses
CTRL1 = 0x20
CTRL2 = 0x21
CTRL3 = 0x22
CTRL4 = 0x23
CTRL5 = 0x24
CTRL7 = 0x26
IG_THS_X1 = 0x32
IG_THS_Y1 = 0x33
IG_THS_Z1 = 0x34
IG_DUR1 = 0x35
IG_CFG1 = 0x30
IG_SRC1 = 0x31
XL_REFERENCE = 0x3A
def write_register(reg, value):
spi.xfer2([reg & 0x7F, value])
def read_register(reg):
return spi.xfer2([reg | 0x80, 0x00])[1]
# Initialization sequence
write_register(CTRL1, 0x3F) # ODR 100Hz, XYZ enabled, BDU
write_register(CTRL2, 0x02) # HP filter for interrupt
write_register(CTRL3, 0x08) # INT1 from IG1
write_register(CTRL4, 0x04) # FS=2g, auto-increment
write_register(CTRL5, 0x00) # Active high, push-pull
write_register(CTRL7, 0x04) # Latched interrupt
# Set thresholds (250 mg)
write_register(IG_THS_X1, 0x20)
write_register(IG_THS_Y1, 0x20)
write_register(IG_THS_Z1, 0x20)
write_register(IG_DUR1, 0x00) # No duration
# Dummy read to settle HP filter
read_register(XL_REFERENCE)
# Configure interrupt sources
write_register(IG_CFG1, 0x2A) # Enable XHIE, YHIE, ZHIE
print("Waiting for wake-up event...")
try:
while True:
if GPIO.input(INT_PIN) == GPIO.LOW:
# Read interrupt source to clear INT pin
src=read_register(IG_SRC1)
print(f"Interrupt triggered! Source: {bin(src)}")
# Add your event handling code here
except KeyboardInterrupt:
spi.close()
GPIO.cleanup()
