I2C sensor with WiPy2

[Eric24]

@SesamProductions I'm afraid I don't have any more information on that library. But smbus is just the I2C library for whatever hardware platform it was written for. You should be able to substitute pycom's I2C functions readfrom_mem and writeto_mem for b.read_byte_data and b.write_byte_data, respectively. But note, I've never actually tried to access 16-bit addresses using pycom's I2C functions. If they don't work, please do submit a bug report, and in that case, you should be able to accomplish the same thing using the writeto and readfrom method that @robert-hh suggested earlier.

[SesamProductions]

Great! Now I'm starting to understand this a bit!
I can read and write stuff using @robert-hh's suggestions, and the sensor seem to output correct data. Now I just have to modify my library with new read/write methods.

Thanks a lot for the help!

[chumelnicu]

@iotmaker Hello , can u tell me please what is maximum distance range?

[chumelnicu]

@iotmaker Hi , did u read distance using vl53l0x with this code? Wrking and long distance too? i mean 200cm?
Thx!

[ledbelly2142]

@chumelnicu
It's in the specification of the sensor, see HERE that the VL6180X can measure up to 20 cm.

The VL53L0X will measure up to 2 Meters (6.6Ft) away. You can see it on a breakout board HERE

[chumelnicu]

@ledbelly2142 I know the diference between VL6180X and VL53L0X ! The question has target other response and was for @iotmaker

I did asked him if he managed to read the VL53L0X in long range mode (that mean 200cm)

[chumelnicu]

@sesamproductions Did u manage to read VL53LX0 in long distance mode?

Thx!

[JasonTimmins]

@iotmaker Thanks for your code for the VL53L0X distance sensor. I've got the same configuration here and, although I can read the various registers you mention (Revision ID, Device ID, etc), I can't actually get a distance from the thing. VL53L0X_REG_RESULT_RANGE_STATUS is zero all the time and your 'distance' code gives zero too.

This looks like a fairly complex device, am I missing some kind of initialisation procedure?

Cheers
Jason.

[iotmaker]

@JasonTimmins

This is my full code

just clean it up hehe

from machine import UART
from time import sleep_ms
from network import Sigfox
from machine import I2C
import socket
import pycom
import re
import binascii
import ubinascii
from machine import Pin
import ustruct
import time

VL53L0X_REG_IDENTIFICATION_MODEL_ID=0xc0
VL53L0X_REG_IDENTIFICATION_REVISION_ID=0xc2
VL53L0X_REG_PRE_RANGE_CONFIG_VCSEL_PERIOD=  0x50
VL53L0X_REG_FINAL_RANGE_CONFIG_VCSEL_PERIOD=0x70
VL53L0X_REG_SYSRANGE_START=0x00
VL53L0X_REG_RESULT_INTERRUPT_STATUS=0x13
VL53L0X_REG_RESULT_RANGE_STATUS=0x14
sensor= 0x29#I2C Address


### Sigfox Stuff
sigfox = Sigfox(mode=Sigfox.SIGFOX, rcz=Sigfox.RCZ2)

# create a Sigfox socket
s = socket.socket(socket.AF_SIGFOX, socket.SOCK_RAW)

# print Sigfox Device ID
print("Sigfox ID")
print(binascii.hexlify(sigfox.id()))

# print Sigfox PAC number
print("Sigfox PAC")
print(binascii.hexlify(sigfox.pac()))

# make the socket blocking
s.setblocking(True)

# configure it as uplink only
s.setsockopt(socket.SOL_SIGFOX, socket.SO_RX, False)

#Sigfox Stuff
pycom.heartbeat(False)
##RGB Colors
red=0xff0000
yellow=0xffff00
green=0x00ff00
blue=0x0000ff
cyan=0x00feff
purple=0xc442a1
orange=0xff8b55
dark=0x000000




def ledtoggle(color):
    pycom.rgbled(color)
    sleep_ms(50)
    pycom.rgbled(dark)
    sleep_ms(50)

def i2c_w(reg,val):
    i2c.writeto_mem(sensor,reg,bytes([val]))##Put device on standby mode
    sleep_ms(1)





## address 0x1D
i2c = I2C(0)                         # create on bus 0
i2c = I2C(0, I2C.MASTER)             # create and init as a master
i2c.init(I2C.MASTER, baudrate=400000) # init as a master
sleep_ms(30)

print("I2C Scan for devices")
print(i2c.scan())
print("Revision ID ")
print(i2c.readfrom_mem(sensor,VL53L0X_REG_IDENTIFICATION_REVISION_ID,1))
print("")
print("Device ID ")
print(i2c.readfrom_mem(sensor,VL53L0X_REG_IDENTIFICATION_MODEL_ID,1))
print("")
print("Pre Range config Period")
print(i2c.readfrom_mem(sensor,VL53L0X_REG_PRE_RANGE_CONFIG_VCSEL_PERIOD,1))
print("")
print("Final  Period")
print(i2c.readfrom_mem(sensor,VL53L0X_REG_FINAL_RANGE_CONFIG_VCSEL_PERIOD,1))
sleep_ms(30)
print("")


cnt=0
val=0
a=0
while True:

    #print("Start Measuerment")
    i2c_w(VL53L0X_REG_SYSRANGE_START, 0x02)

    while (cnt < 100):
            #1 second waiting time max

        val=i2c.readfrom_mem(sensor,VL53L0X_REG_RESULT_RANGE_STATUS,1)



        if val==64:
            cnt=200
        cnt=cnt+1

    sleep_ms(30)

    datasensor=i2c.readfrom_mem(sensor,0x14,12)#Read sensor data
    distance=datasensor[10]*256+datasensor[11]#combine integers
    #print("distance")
    print(distance)
    if 100<=distance<=200:
            print('Sending Sigfox')
            s.send(bytes([datasensor[10], datasensor[11], 255, 255, 255, 255, 255, 255, 255, 255, 255, 255]))
            ledtoggle(blue)
            ledtoggle(blue)
            ledtoggle(blue)
            ledtoggle(blue)
            print("By law it will sleep 20 seconds")
            time.sleep(20)
    ledtoggle(green)
    # for x in range(0,12):
    #     print(datasensor[x])
    #
    # print(datasensor)

    # print(datasensor[10])
    # print(datasensor[11])
    # print("")
    sleep_ms(1000)```

[JasonTimmins]

@iotmaker Thanks, that's got it working. I think I was missing...

i2c_w(VL53L0X_REG_SYSRANGE_START, 0x02)

It's now sitting here telling me how far my ceiling is above my desk!.. ~1690mm :-)

I see a distance reading on 20mm quite often (30% of the time), why do you suppose that would be?

Thanks again
Jason.

[iotmaker]

@jasontimmins

Yes thats a bug i have on the code, have not dig into it yet on how to fix it.. But if you figure it out, please share :)

[chumelnicu]

@iotmaker , @JasonTimmins Maybe that could help

https://github.com/adafruit/Adafruit_CircuitPython_VL53L0X/blob/master/adafruit_vl53l0x.py

[JasonTimmins]

@chumelnicu This looks like a great library but I'm struggling to convert it to work on the Pycom device. Python is not my strong point. How different are Adafruit and Pycom devices?

[chumelnicu]

@jasontimmins Hi , I dont know i suppose is not very hard ... try to find similar conversions for other sensors from Adafruit i2c mode and apply to pycom microphyton ...

Or maybe u should try to use i2c workflow from @iotmaker and rest of code and registers from Adafruit

The single difference that i see is the i2c addressing mode.

I dont know Python programming ...

If u have any result pls share :)

thx!

[chumelnicu]

@chumelnicu @JasonTimmins , @iotmaker Any update with VL53L0X library ?

Thank you !