Hello @AndyT

please have a look at the following example which stores variables after the ULP code: deep sleep example

Cheers
Felix

Hello Mike

it looks like the AtomMatrix example has been replaced and works now. (And yes, the previous example was broken for me too.)

Cheers
Felix

Hello Mike

I don't know if it helps, but I wouldn't mix UIFlow versions. Try selecting beta in UIFlow Web which should match the UIFlow firmware v1.6.5 on your M5AtomMatrix.

Felix

Hello Mike

hmm, the color picker is a little popup window. Maybe try a different browser?

Felix

Hello Paul

my M5StickC is doing that out of the box. As soon as I attach USB it turns on. Is that not happening to your M5StickC?

Cheers
Felix

Hello Mike

try clicking onto the little color rectangle next to the text 'Set atom matrix'. This should give you a color picker.

Cheers
Felix

Hello @Balta

you are absolutely correct - as long as you don't call Wire.begin(25,21,10000) GPIO25 or GPIO21 should be available for OneWire.

Unfortunately I only have one DS18B20 so I cannot fully recreate your setup. Did you try your M5Atom Lite setup with only one sensor?

Good luck!
Felix

Hello @JackH

Here is my attempt to reduce flicker for a simple counter. The code separates the digits and only updates the ones which are necessary. The flicker isn't completely gone, but at least only the digit which changes flickers a little bit.

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

setScreenColor(0x000000)

count0 = None
oldten0 = None
one0 = None
ten0 = None

from numbers import Number
import math

count0 = 0
oldten0 = 0
for count in range(30):
  one0 = count0 % 10
  lcd.print(one0, 20, 5, 0x000000)
  count0 = (count0 if isinstance(count0, Number) else 0) + 1
  one0 = count0 % 10
  lcd.print(one0, 20, 5, 0xff0000)
  ten0 = math.floor(count0 / 10)
  if ten0 != oldten0:
    lcd.print(oldten0, 5, 5, 0x000000)
    lcd.print(ten0, 5, 5, 0xff0000)
    oldten0 = ten0
  wait_ms(300)

BTW: In the Arduino environment a solution to reduce flicker is to use sprites, but I have no idea if sprites exist in M5Stack's MicroPython implementation.

Cheers
Felix

Hello @Balta

I think you missed enabling Serial on your M5Atom. Try including:

#include <M5Atom.h>

then in setup() enable Serial and disable I2C to have GPIO25 and GPIO21 freed up for use with OneWire:

// Enable Serial, disable I2C, enable Display
M5.begin(true, false, true);

and I would add some delay in your loop():

delay(1000);

BTW: In my M5Atom setup I've verified all available GPIOs (19, 22, 23, 33, 21 and 25) successfully to work with OneWire.

Good luck
Felix

For reference - full code using GPIO25:

#include <M5Atom.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// GPIO where the DS18B20 is connected to
const uint8_t oneWireBus = GPIO_NUM_25;

// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(oneWireBus);

// Pass our oneWire reference to Dallas Temperature sensor
DallasTemperature sensors(&oneWire);

float DS18B20_temperature = -100.0;

void setup() {
  // Enable Serial, disable I2C, enable Display
  M5.begin(true, false, true);
  sensors.begin();
}

void loop() {
  sensors.requestTemperatures();
  const float temperature = sensors.getTempCByIndex(0);
  Serial.println(temperature);
  delay(1000);
}

Hello @Skink

thank you for the clarification. I appreciate it.

Thanks
Felix