EEVblog > EEVblog Specific
EEVblog 1493 - The MacGyver Project - Part 2
EEVblog:
Powering up the Banshee ultrasonic leak detector LED display to see how the display is multiplexed turned out to be very interesting!
With special guest debugger, Sagan!
JustMeHere:
Drive this with a SPI running at 2v? It looks like a MOSI, a CLK, and a CS.
firewalker:
I believe everything has to do with the case. You could build a spark igniter inside the case and they wouldn't mind.
Alexander.
NivagSwerdna:
On the PCB it is marked HDSP-U113... now all you 7-segment fan boys will recognise that as a Broadcom Device... https://docs.broadcom.com/doc/AV02-3584EN
Now on those babies Vf is 2.1V and 15mA/seg at full brightness... A supply of 2V doesn't cut it. And those segments all appear evenly lit... and 88888 looks as bright as .40.db. and v.v.
There is still some mystery to be solved here Scooby!
NivagSwerdna:
Could it be you have your knickers in a twist?
@20:49 you notice that during the shift register refresh the CH3 signal goes high... that probably represents being OFF for the duration of the data refresh to avoid artifacts... the actual driving is when this is LOW?
(The free range bits also suggest a shared data line? "Free Range" is a great term... might have to adopt that)
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