Reading Fifo continuosly

[cool112624]

Hi, first of all thank you for your code
What I was trying is to read continuosly from fifo and write to file, but I am confused on the convert data
this is the error that I face, Can you help me?
Thank you in advance

Code

# Import Library
import MPU6050_lib_3 as MPU6050
import RPi.GPIO as GPIO
import time

pin = 21
GPIO.setmode(GPIO.BCM)
GPIO.setup(pin, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

# TargetSampleNumber= 1024
# TargetRate =  33    # frequency =  8000 / ( integr value + 1)  minimum frequency=32,25

# Adjust read rate
TargetRate = 1000 # max = 2000Hz 

# Setting Sensor
mpu6050 = MPU6050.MPU6050()
mpu6050.setup()
mpu6050.setGResolution(2)
mpu6050.setSampleRate(TargetRate)
mpu6050.resetFifo()
mpu6050.enableFifo(True)
time.sleep(0.01)

print ("Capturing {0} samples/sec".format(mpu6050.SampleRate))
value=[]
#FO = open("RawData.txt","a")


for i in range(10000):
    f = open("data.txt", 'a')
    t1 = time.time()
    trigger = GPIO.input(pin)
    value = mpu6050.readDataFromFifo()
    I = mpu6050.convertData(value)
    print(I.Gyrox)
    f.write("{0:1.1f}\t{1:1.1f}\t".format(t1,trigger))
    f.write("{0:0.3f}\t{1:2.3f}\t{2:2.3f}\t".format(I.Gx,I.Gy,I.Gz))
    f.write("{0:3.3f}\t{1:3.3f}\t{2:3.3f}\t{3:3.2f}\n".format(I.Gyrox,I.Gyroy,I.Gyroz,I.Temperature))
    value.clear()
    t2 = time.time()
    print((t2-t1)*1000)

[danjperron]

Hi, the code was made for python2. on python3 you just need to get rid of buffer

def convertData(self,ListData): ShortData = struct.unpack(">hhhhhhh", bytearray(ListData)) .....etc...

Explanation of the code ***@***.***:~/mpu6050TestInC $ python3 Python 3.9.2 (default, Mar 12 2021, 04:06:34) [GCC 10.2.1 20210110] on linux Type "help", "copyright", "credits" or "license" for more information. # I will load the library with buffer removed from convertData # and manually read the sensor #first import the needed library

>> import MPU6050 >> import struct

# initialize the mpu6050

>> mpu6050 = MPU6050.MPU6050() >> mpu6050.setup()

#ok we need to create an smbus object since I will execute fonction outside the library

>> import smbus >> bus = smbus.SMBus(1)

#here I'm reading 14 bytes! This is the three accelarations, three gyros and the last one is the temperature

>> Gdata = bus.read_i2c_block_data(mpu6050.MPU6050_ADDRESS, mpu6050.MPU6050_RA_ACCEL_XOUT_H,14) >> Gdata

[243, 128, 16, 128, 195, 72, 238, 240, 246, 70, 250, 183, 252, 97] #ok I want to extract the 7 values which are 16bits unsigned # best way is use struct unpack but it needs to be a stream of bytes so in python3 bytearray directly # no need to convert to buffer

>> struct.unpack(">hhhhhhh",bytearray(Gdata))

(-3200, 4224, -15544, -4368, -2490, -1353, -927)

>>

Best regards, Daniel Le 01/03/23 03:00, cool112624 ***@***.***> a écrit :

…

Hi, first of all thank you for your code What I was trying is to read continuosly from fifo and write to file, but I am confused on the convert data this is the error that I face, Can you help me? Thank you in advance (https://user-images.githubusercontent.com/51593747/222078911-9f9dd9b5-8b64-4e91-8436-e3fdb20e0970.png" rel="noopener noreferrer nofollow noopener noreferrer" target="1">Code # Import Library import MPU6050_lib_3 as MPU6050 import RPi.GPIO as GPIO import time pin = 21 GPIO.setmode(GPIO.BCM) GPIO.setup(pin, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # TargetSampleNumber= 1024 # TargetRate = 33 # frequency = 8000 / ( integr value + 1) minimum frequency=32,25 # Adjust read rate TargetRate = 1000 # max = 2000Hz # Setting Sensor mpu6050 = MPU6050.MPU6050() mpu6050.setup() mpu6050.setGResolution(2) mpu6050.setSampleRate(TargetRate) mpu6050.resetFifo() mpu6050.enableFifo(True) time.sleep(0.01) print ("Capturing {0} samples/sec".format(mpu6050.SampleRate)) value=[] #FO = open("RawData.txt","a") for i in range(10000): f = open("data.txt", 'a') t1 = time.time() trigger = GPIO.input(pin) value = mpu6050.readDataFromFifo() I = mpu6050.convertData(value) print(I.Gyrox) f.write("{0:1.1f}\t{1:1.1f}\t".format(t1,trigger)) f.write("{0:0.3f}\t{1:2.3f}\t{2:2.3f}\t".format(I.Gx,I.Gy,I.Gz)) f.write("{0:3.3f}\t{1:3.3f}\t{2:3.3f}\t{3:3.2f}\n".format(I.Gyrox,I.Gyroy,I.Gyroz,I.Temperature)) value.clear() t2 = time.time() print((t2-t1)*1000) — Reply to this email directly, view it on GitHub(#3 ), or unsubscribe(https://github.com/notifications/unsubscribe-auth/ABBF7XGIREJ2UY25RZJVB4LWZ363PANCNFSM6AAAAAAVLWP47I ). You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[cool112624]

Thank you for your detail explaination

I use MPU6050 library before and sucess, but I want to read sensor value every 1ms, but using this library I can only read sensor value fatest at 1.8ms

so I want to read from sensor Fifo

[danjperron]

I use MPU6050 library before and sucess, but I want to read sensor value every 1ms, but using this library I can only read sensor value fatest at 1.8ms

I'm confuse is it about my library or another one?

If it is mine you should use the C version.

[cool112624]

I am sorry, I ask in wrong place
but thank you for your kind explaination
appreciated