Backstory (not required reading): I am working on a project for a FIRST Robotics club I mentor. The club has a sign, "This team has gone xx days without an accident!" But they only drew enough numbers to go up to 7. So every 7 days the count is reset.
Okay, what exactly does the TPIC6B595N do? Again, sorry I'm new to all this.
After doing a continuity test I found that pins 1 and 5 are common. so I'm pretty sure it's common anode.
Need a 7.5V wallwart and TPIC6B595 to sink current from the cathodes.
Why "reset" it?You could get a pen and draw a '+' after the number 7 on the last one.
Mentor of a robotics club who doesn't know how to use google...?
Nope. There's four variants there, 1+5 common could also be common anode.You need to get +5V and GND from your Arduino and find out which way the voltage goes between pin 1 and 7. 5V should be enough to light it up dimly.
Another option would be adding ULN2803 as output buffer to 74HC595.
Quote from: CrossRoads on May 30, 2014, 04:12 pmAnother option would be adding ULN2803 as output buffer to 74HC595.Since they are using an Arduino Mega and only need to drive 14 segments they can probably just use one output pin per segment rather than using a shift register. That could be done with two ULN2803's or a bunch of small NPN transistors.
Why only two displays, why not at least 3 or maybe 4? Are you expecting to have any accident once per 99 days?
Not sure which buttons you were looking it...?