aapicella

basically you want to rotate the font bits so instead of taking colums you take rows.I would think you could accomplish that in drawSprite function by swapping x and y. If I get some time this week I will test it.

Awesome thanks so much.

I like the instructable and was going to try it but the link to the source code took me to another blog but no source code. Could you make the source available It looks like you are very successful with this bot.

In the code you would change the linesconst int LEDMATRIX_WIDTH = 31; const int LEDMATRIX_HEIGHT = 7;const int LEDMATRIX_SEGMENTS = 4;to (assuming straight line) const int LEDMATRIX_WIDTH = 63; const int LEDMATRIX_HEIGHT = 7;const int LEDMATRIX_SEGMENTS = 8;I hope that helps, Good luck.

Currently I set it to 52 characters. Can modify the HTML in the arduino script.if you search for maxlenght='52' you may change that. I hope that answers your question.

I updated the doc, but this board has RX/TX mislabeled so it looks like rx/rx when its really rx/tx

http://www.esp8266.com/wiki/doku.php?id=esp8266-de...the esp8266 site called out the typos on the dev board labels. That's what caused the confusion.

I should explain that. The development board has them reversed. Apparently they were mislabeled. I didn't find that out until I read an article after this post. You are absolutely correct that is should be Rx-> Tx and Tx-> Rx.

I went ahead and rebuilt it as you said. I think there is value in using this build because it limits the complexity of the ESP8266 programming. you can just serial print when you want to display something. Here is the ESP8266 Only version: www.instructables.com/ESP8266-To-LED-Matrix-Look-Ma-No-Arduino/

I took your advice and built this out without the Arduino. This build does have its advantages in lowering the complexity of the ESP8266 programming. Just Serial print and see the results. I put an Instructable up for the ESP8266 without the Arduino here: https://www.instructables.com/id/ESP8266-To-LED-Matrix-Look-Ma-No-Arduino

Fixed the typo thanks.

The LED matrix I have runs on 5v. When given 3.3v it stops working properly. The letters scroll through the first part then the display starts flickering. There are 256 leds so maybe once a certain number are lit it stops working properly. In any case the MAX7219 is rated for 5v and there is a different low voltage chip available called MAX6951 which sparkfun recommends for low voltage projects. I will rebuild this project without the arduino to verify.

No but i will. The datasheet said the min was 3.5 so it may work.

That sounds like a good idea to me.