I2C sensor with WiPy2

[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 !