Chris Wilcox Posted February 17, 2019 Report Share Posted February 17, 2019 I'd like to use a LogicStart Shield with a basic 5V Arduino UNO to use for early S/W design of a digital clock for a High School STEM program I am teaching. We need a 7-Seg display and some switches to set the time, timer, and mode of the clock. It looks like the slide switches would be fine but will the 7-Segment AN drivers be OK driven by 5V Arduino UNO outputs? As I recall, some of the individual LEDs have limiting resistors on the DUO so I'll stay away from driving those. Thanks, -Chris Quote Link to comment Share on other sites More sharing options...
F6EEQ Posted April 2, 2019 Report Share Posted April 2, 2019 Funny enough, but the LED's have 330 ohms limiting resistors, but not the 7 segment., at least this is what I see on the Megawing schematic.. I checked the 7 segment notice, so it is said 20 mA, and 2.1 V typical, but nothing about a limiting resistor, which is always good to have in my opinion. I don't know why Jack did not provide these... Anyway, when I use a LED (anyone) with an ARDUINO, it is always safe to have a limiting resistor (330 ohms if you wish a bright glow, but 1 k should do the trick). More important: ARDUINO provides 3.3 or 5 V, so be sure not to overload the Megawing! Have fun. Gerard. Quote Link to comment Share on other sites More sharing options...
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