QRCode2 is hot

glabasnat

Hi, I’m using the AtomS3 Lite with the QRCode2 Base.
The QRCode2 draws a high current of around 170 mA at 5 V and starts to heat up after a few minutes, even in pulse mode.

Is this normal?
Is there any way to reduce its power consumption?

Tomas

yuyun2000

@glabasnat
The Atomic QRCode2 Base (SKU: A133-B) typically draws a working current of around 174.18 mA at 5V when connected to an Atom-Lite. Your observation of 170 mA is within the expected range, so this behavior is normal.
However, if the device is heating up significantly, you can try the following to reduce power consumption:

Use Pulse Mode: Ensure you are using the TRIGGER_MODE_PULSE mode to minimize continuous power draw.
Adjust Lighting: Reduce the brightness of the fill light (set_fill_light_brightness) or turn it off when not needed (FILL_LIGHT_OFF).
Limit Continuous Operation: Avoid prolonged continuous scanning by using shorter decode delays (set_decode_delay).

If the issue persists, check for firmware updates or ensure proper ventilation around the device.

https://chat.m5stack.com/

hacxx

170 mA at 5V does seem a bit high for QRCode2. Some heating is normal, especially under continuous or pulse operation. To reduce power consumption, try lowering the duty cycle or reducing the brightness if possible. Also, check if firmware updates offer power-saving modes. Good ventilation or a small heat sink can help with heat dissipation too. If it keeps overheating, it might be worth contacting the manufacturer for advice or possible defects.

glabasnat

@yuyun2000
Hi, I used the chat, but it didn’t help.

I’m using a similar code with Pulse mode:

AtomS3 Lite + QRCode2 Base = 230mA
AtomS3 Lite + QRCode1.1 Base = 75mA

That’s too big of a difference when using a battery.

import os, sys, io
import M5
from M5 import *
import time
from base import AtomicQRCode2Base

base_qrcode2 = None

def setup():
  global base_qrcode2, data

  M5.begin()
  base_qrcode2 = AtomicQRCode2Base(2, 5, 6, 7)
  base_qrcode2.set_trigger_mode(base_qrcode2.TRIGGER_MODE_PULSE)
  base_qrcode2.set_trig(0)
  time.sleep_ms(30)
  base_qrcode2.set_trig(1)
  print('take measurements')


def loop():
  global base_qrcode2, data
  time.sleep_ms(30)