I would really like to have an M5stack with e-paper display! I do have one of the use cases you mentioned - bitcoin price ticker, but I'm not using M5Stack due to several limitations, the biggest of which is that the display cannot stay ON while device is sleeping.

If anyone develops an M5stack with e-paper display (and eliminates the above limitation), I will gladly buy large quantities of this device!

For those who are interested in trying out the TicrThing for free, you can now find the firmware in the M5Burner.

For those who are interested, the code at the end of this tutorial works well. The tutorial is about strings, but works in exactly the same way for base64-encoded jpg images. All you have to do after decoding the string (containing the base64-encoded jpg image) is to write it to SPIFFS and then call M5.Lcd.drawJpgFile(SPIFFS, jpgFileName, 0, 0);

Thank you @ajb2k3 for the tip. That worked! I contacted the M5Stack technical support and not long after my firmware was included in the M5Burner.

Hey @ajb2k3, thanks for your input, but I'm afraid bigger/external battery doesn't answer OP's question and neither the issue I referenced. An e-paper display will certainly render the M5stack a lot more energy efficient while preserving the same product size (while external battery will just make the product bigger). And yes, e-papers of this size do exist, though are probably more expensive than the OLED.

@Mati if your M5stick is indeed in deep sleep while the display is on, then the issue I referenced earlier affects only the M5stack. I don't see why this issue is not fixed in this product...

@gipsyblues I suppose you have figured it out by now (and sorry for late reply - I got no notification for this post). In any case, you can download the M5Burner software, connect your M5stack basic (not core2) and flash the TicrThing firmware. Let me know if you encounter difficulties, preferably in a PM so we don't hijack this thread.

For those who are interested, the code at the end of this tutorial works well. The tutorial is about strings, but works in exactly the same way for base64-encoded jpg images. All you have to do after decoding the string (containing the base64-encoded jpg image) is to write it to SPIFFS and then call M5.Lcd.drawJpgFile(SPIFFS, jpgFileName, 0, 0);

Thank you @ajb2k3 for the tip. That worked! I contacted the M5Stack technical support and not long after my firmware was included in the M5Burner.

For those who are interested in trying out the TicrThing for free, you can now find the firmware in the M5Burner.

How does one include their firmware in the M5Burner? I followed the official instructions and submitted a pull request, but 10 days later there is still no merge or even comment.

Is there another way to include firmware? Or I simply need to wait (indefinitely)?

Bonus question: how do you include an image/gif with your firmware, so it appears in M5Burner? This is not explained in the official instructions.

I saw a crypto project on the M5Stack and had to comment!

First of all congrats to @frittna for the good execution of the concept. Didn't try it myself, but looks great on the photos!

Seven years ago I started working on a similar crypto project. Decided to go all the way from idea to market, not just because I love crypto, but because I wanted to gain the learning and experience on the way. It was worth it!

I've seen a lot of "weekend projects", but none of them had the features I wanted or was easily configurable by non-technical people. So I brought my crypto project to a full commercial product. I call it the TicrThing - your dedicated price ticker. (sorry for the obvious ad)

The previous versions had custom-made hardware, but they always lacked something... Once I discovered the M5Stack, I thought it was a perfect fit. So I completely re-wrote my code for the M5Stack, wrote also the server side, and released the new product earlier this year. Hope this helps bring the M5Stack platform to a wider audience!

P.S. It was not my intention to hijack the thread, but to share the story of a similar crypto project and how it evolved to use the M5Stack.

Greetings,
Do you have a minimal example in Arduino/C showing how to draw a base64 encoded image? Imagine I have an image that is saved as a base64 string (either in a string variable or in a text file, doesn't matter). The question why I have the image as base64 encoded string is out of scope :). How do I draw this image on the screen of an M5Stack Core? Thanks in advance!

Note that I am not talking about encoding an image to base64, nor about serving (webpages containing) base64 images. I have a base64 encoded image saved on the M5Stack Core and I want to display it on the screen.

Hey @pierred and @crami25 - no offense, but it looks like you are hijacking this thread to discuss a different topic, i.e. how to wake from sleep. The original topic of this thread is "how to enter deep sleep while keeping the LCD on". This is still not solved and I doubt that it will ever be.

Hey @mati. Any success on this?
Just to be clear, the issue is not that I need to cut the LCD in deep sleep, but just the opposite - to keep the LCD ON while the M5Stack is in deep sleep. Have you managed to test this?

Hey @ajb2k3, thanks for your input, but I'm afraid bigger/external battery doesn't answer OP's question and neither the issue I referenced. An e-paper display will certainly render the M5stack a lot more energy efficient while preserving the same product size (while external battery will just make the product bigger). And yes, e-papers of this size do exist, though are probably more expensive than the OLED.

@Mati if your M5stick is indeed in deep sleep while the display is on, then the issue I referenced earlier affects only the M5stack. I don't see why this issue is not fixed in this product...