Electronics > Projects, Designs, and Technical Stuff
Driving 2x Hewlett-Packard HDSP-6508 over i2c
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Lomax:
I'm working on a mock-up "submarine" exhibit for a public exhibition, which I want to fill with bits of surplus aviation/military gadgetry (because surplus "submarine" gadgets are rare & expensive). Most of this will be completely non-functional, though I've got the illumination of the gauges hooked up. I'm also adding some lighted pushbutton matrixes and a couple of 7-segment LED displays. Nothing needs to be accurate, I just want it to look somewhat convincing. Amongst the military surplus bits I've got hold of is the front panel of a Racal vehicle radio, which has two lovely HP HDSP-6508 16-segment LED modules, and I cannot resist trying to bring this to life. The LED modules are conveniently broken out into a pin header, for which I've established which pin corresponds to which segment - and they are common anode modules. I've only really used common cathode displays before, and it turns out finding a suitable driver for common anode displays is harder than I thoguht. There's the obsolete Philips SAA1065, which can still be bought as bare chips, but I don't have time to make a board for these. So I though I'd check here, if anyone has any suggestions? As I'm rather pressed for time I really need a plug'n'go type solution, or at least a finished breakout board - something like the Adafruit HT16K33 "backpack", but for common anode displays.
Tomorokoshi:
Something like this in perf board wire-wrap sockets?
https://www.digikey.com/products/en?keywords=MCP23017-E%2FSP-ND
https://www.digikey.com/products/en?keywords=MCP23008-E%2FP-ND
Lomax:
Scratch that, I'm an idiot - they are common cathode LEDs. :palm:
Please distract yourselves from my stupidity with these pretty pictures!
Lomax:
Success, using the HT16K33 driver:
Pin assignment:
--- Code: --- HT16K33 Segment HDSP-6508
-----------------------------
A0 h 25
A1 i 20
A2 j 16
A3 g2 18
A4 k 9
A5 l 5
A6 m 8
A7 g1 1
A8 a2 19
A9 a1 23
A10 b 22
A11 c 24
A12 d2 4
A13 d1 11
A14 e 7
A15 f 26
-- dp 2
--- End code ---
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