Help with UNIT IR and NanoC6 in Uiflow2

HybridZach

Hi. I usually use M5 products with esphome. I an completely novice with UIflow2 and mycropython. I would like some help using the unit IR to decode a ac remote. I followed the video example on m5docs, and I have an error.

Here is the code:

import os, sys, io
import M5
from M5 import *
from unit import IRUnit



ir_0 = None


data = None
addr = None


def ir_0_rx_event(_data, _addr, _ctrl):
  global ir_0, data, addr
  data = _data
  addr = _addr
  print(data)


def setup():
  global ir_0, data, addr

  M5.begin()
  ir_0 = IRUnit((1, 2))
  ir_0.rx_cb(ir_0_rx_event)
  data = 0
  addr = 27


def loop():
  global ir_0, data, addr
  M5.update()


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")

I get error:

Traceback (most recent call last):
  File "<stdin>", line 25, in <module>
  File "<stdin>", line 17, in setup
  File "unit/ir.py", line 24, in rx_cb
  File "driver/ir/nec.py", line 116, in __init__
  File "driver/ir/nec.py", line 67, in __init__
  File "driver/ir/receiver.py", line 47, in __init__
ValueError: invalid Timer number

The only thing that is different from the YouTube video is instead of setting a label to print the data value I am printing it to console, could this be the problem?

yuyun2000

The "invalid Timer number" error occurs because the IRUnit is trying to use a hardware timer that's either unavailable or already in use on your M5 device. ESP32-based boards have limited hardware timers (usually 4, IDs 0-3), and the default timer allocation in the IR library might conflict with other system functions.
Solution:Explicitly specify a valid timer ID when initializing the IRUnit. Modify your setup code to include the timer_id parameter with a value between 0-3:
ir_0 = IRUnit((1, 2), timer_id=1) # Try timer IDs 0, 1, 2, or 3

Troubleshooting Tips:

Test different timer IDs (0-3) if the first attempt fails
Ensure no other libraries/features are using the same timer (e.g., PWM, other sensors)
Verify your M5 device's firmware is up-to-date via UIFlow2

https://chat.m5stack.com/