Python example?

[mattrpav]

I'm looking to wire up the 2m sensors to a Raspberry Pi for an 8th grade intro to engineering class. Any tips or sample code for reading the sensor via Python?

[mattrpav]

I have it wired up to a raspberry pi 5. the indicator light is on, and I am able to detect it using i2cdetect.

However, I do not think I am getting a proper read b/c it mostly returns a value of 0. Occasionally, it will output a different value, but not consistently when I waive may hand over the sensor.

Thoughts?

i2cdetect output:

# i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- 29 -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --                         

Sample code:

import smbus
import time

# I2C channel 1 is connected to the GPIO pins
channel = 1

#  REV-31-1505  defaults to address 0x52
address = 0x29

# Initialize I2C (SMBus)
bus = smbus.SMBus(channel)

while True:
    print('value: ' + str(bus.read_byte(address)))
    time.sleep(1)

Code output:

value: 0
value: 0
value: 1
value: 64
value: 0
value:0

[mattrpav]

Reviewing the C++ code, looks like the I2C device needs to be initialized. Is there a specification on the I2C commands needed to initialize the 2m sensor via i2c?