ru

 RadioLocman Forum 11x42 LED Matrix with Arduino UNO
 User Name Remember Me? Password
 Register FAQ Calendar Search Today's Posts Mark Forums Read

 Microcontrollers (MCU) Application and programming of MCUs, Evaluation Kits and Demonstration Boards, Programmers.

 10-19-2015, 05:16 PM #1 tracert Member   Join Date: Nov 2013 Posts: 55 11x42 LED Matrix with Arduino UNO I'm planning to build an 11x42 LED Matrix for my Daft Punk Helmet . I decided to split into 2 sub-matrizes, 11x21 each. Therefore I will need 11+21 = 32 bits to control each sub-matrix with multiplexing. I thought of controlling the matrix with a 32-bit shift register. The shift registers will be driven an Arduino UNO that also provides the 5V current. The rows will be the cathodes, the columns will be the anodes. I want to scan it row by row, so that every row is on 1/11 of the time. Now, here's my problem: The number of leds that are lit in one row varies between 0 and 21 obviously. That means the resistance needed varies a lot, too. How do make this work and assure all the LED have the same brightness (and don't fry, obviously)? I've read about some things people used for their matrix, but I don't know which one really solves the problem: -MAX7219 LED driver -Current Driver/ Current Sink -Transistors/FETs -Darlington Arrays Also, how do I deal with the odd numbers (11 and 21)? Most of the drivers come in 8 / 16 / 32 bit only.
 10-22-2015, 05:55 PM #2 hemilton Member   Join Date: Nov 2013 Posts: 53 One of the drive lines has only one LED on at a time or no LED. That's the line you put the resistor. 9% of the time is not going to give very much brightness and you will need sinking transistors. You are much better off the have a run of 5 and a run of 6

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Electronics and ...     Microcontrollers (MCU)     Projects and Advices     Beginners     Electronic Components

 Similar Threads Thread Thread Starter Forum Replies Last Post tracert Microcontrollers (MCU) 1 08-10-2015 05:27 PM tracert Microcontrollers (MCU) 3 07-15-2015 11:34 AM Radiolocman Robot Microcontrollers (MCU) 1 05-17-2015 12:48 PM Radiolocman Robot Projects and Advices 1 10-07-2014 10:04 AM Radiolocman Robot Projects and Advices 1 11-18-2012 04:25 PM

All times are GMT. The time now is 01:24 AM.