| Electronics > Projects, Designs, and Technical Stuff |
| Driving 2x Hewlett-Packard HDSP-6508 over i2c |
| (1/1) |
| 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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