Connecting multi TOF4m units via PA.hub - weird behaviour

sqbaczek

Greetings I am trying to connect 2 TOF4m sensors to M5Stack Core Basic via Pa.hub.
Below basic blockly schematics. As soon as I connect second sensor to PAhub- labels react in a weird way. For example: If I put something near one of sensors - both labels change and show some random distance. As soon as I connect only one sensor to pahub - everything works fine and distance information works.

felmue

Hello @sqbaczek

assuming the programming is correct my best guess would be that the two ToF4m influence each other due to the signal they both send out. Maybe the signal of one gets reflected from the walls and then is picked up by both (and vice versa)?

BTW: have you tried the UIFlow2 instead? Do you get the same results?

Thanks
Felix

sqbaczek

Greetings @felmue!
Thank you for your reply,
Even if I space apart both sensors and direct them in different spots - they still get weird readings. As soon as I disconnect one of them from pa.hub one label gets proper readings - and other gets very simillar reading to first label (even though it is linked with disconnected sensor).
Below screenshot of readings with one sensor disconnected from pa.hub - and both labels change as soon as I get some object near the connected sensor.

For UIflow 1 code is:

from m5stack import *
from m5ui import *
from uiflow import *
import time
import unit


setScreenColor(0x222222)
tof4m_0 = unit.get(unit.TOF4M, unit.PAHUB0)
tof4m_1 = unit.get(unit.TOF4M, unit.PAHUB2)






label0 = M5TextBox(43, 36, "label0", lcd.FONT_Default, 0xFFFFFF, rotate=0)
label1 = M5TextBox(45, 88, "label1", lcd.FONT_Default, 0xFFFFFF, rotate=0)


while True:
  label0.setText(str((str('odl 1 ') + str(((str(((tof4m_0.get_single_distance_value) / 10)) + str('cm')))))))
  label1.setText(str((str('odl 2 ') + str(((str(((tof4m_1.get_single_distance_value) / 10)) + str('cm')))))))
  wait_ms(500)
  wait_ms(2)

When I try to run it on UIflow 2.0 with pa.hub I get error:

Traceback (most recent call last):
File "<stdin>", line 29, in <module>
File "<stdin>", line 20, in setup
File "driver/vl53l1x.py", line 60, in init
File "driver/vl53l1x.py", line 176, in get_model_info
File "driver/vl53l1x.py", line 273, in _read_register
TypeError: unexpected keyword argument 'addrsize'

This is my code for uiflow 2 - and it does not work

import os, sys, io
import M5
from M5 import *
from hardware import *
from unit import TOF4MUnit
from unit import PAHUBUnit



label0 = None
label1 = None
i2c1 = None
pahub_0 = None
tof4m_2 = None
tof4m_0 = None


def setup():
  global label0, label1, i2c1, pahub_0, tof4m_2, tof4m_0

  M5.begin()
  Widgets.fillScreen(0x222222)
  label0 = Widgets.Label("label0", 44, 65, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu18)
  label1 = Widgets.Label("label1", 43, 111, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu18)

  i2c1 = I2C(1, scl=Pin(22), sda=Pin(21), freq=100000)
  tof4m_0 = TOF4MUnit(PAHUBUnit(i2c=i2c1, channel=1), 0x29)
  tof4m_2 = TOF4MUnit(PAHUBUnit(i2c=i2c1, channel=0), 0x29)


def loop():
  global label0, label1, i2c1, pahub_0, tof4m_2, tof4m_0
  M5.update()
  label0.setText(str((str('Odl1 ') + str((tof4m_2.get_distance)))))
  label0.setText(str((str('Odl2 ') + str((tof4m_0.get_distance)))))


if __name__ == '__main__':
  try:
    setup()
    while True:
      loop()
  except (Exception, KeyboardInterrupt) as e:
    try:
      from utility import print_error_msg
      print_error_msg(e)
    except ImportError:
      print("please update to latest firmware")

Thank you for help,
best,
Matt

felmue

Hello @sqbaczek

unfortunately I don't have the proper hardware, e.g. TOF4m unit, so I cannot test this myself. Sorry.

BTW: are you aware that in UIFlow1 you use PaHUB channel 0 and 2 and in UIFlow2 you setup PaHUB channel 0 and 1.

Thanks
Felix

sqbaczek

Hi @felmue,
thanks for response - yes I have tried different ports on PA.hub so between two uiflows sensors might have different port values.

best,