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Topic: LED and MP3 Project For Scoreboard (Read 1 time) previous topic - next topic

florinc

CrossRoads,
Cool board, I like it. An actual LED project using it would give some inspiration to potential customers. The TPIC595 seem to be able to drive multiple LEDs in series/parallel as long as the current does not exceed 100mA and the voltage is no more than 33V.
Keep up the great work!

CrossRoads

Several people have done that. I just don't have pictures.
TPIC6B595 was selected to drive 12V-3/6/9 LED strips, and I think we did some math that showed 12 & 15 would work as well.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

SteveOr

What is the difference between the MAX7219 and the TPIC6B595? 

Ultimately I'm looking for a compact package.  I was thinking that once I finalized the design the 7 segment displays and circuitry for each side of the scoreboard would be on its own PCB. 

I guess I'll tinker around and read some more so I can actually understand the answers to the questions I ask.
Thanks

CrossRoads

MAX7219 drives up to eight 5V, common cathode, 7-segment displays (plus decimal point), by multiplexing 8 anodes line and 8 cathode lines at 800 Hz rate.

TCIP6B595 is a high current/high voltage open drain output shift register. It can be used to sink current from common anode displays.  If you add seperate anode switching control (discrete PNP transistor, PNP array such as UDN2981, or discrete P-channel MOSFET) you can use it to multiplex displays as well under arduino software control.  Or you can just use more of them, 1 per digit, and skip the multiplexing.
(I've  also used them in a multiplex situation to sink current Away from the LED anodes to keep LEDs off, while a NPN array was used for common cathode control (ULN2803). Allows for more current than a 74HC595 can supply- but also runs warmer as the current is either flowing into the display or into the TPiC6B595 all the time.)

The TCPI6B595 is useful for controlling things like 12V powered LED strip lights, which have their own built in current limit resistor.  MAX7219 can't do that without additional hardware.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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