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  • HackerBoxes 0004: Three Fives Replica and 555 Timer Experiments

    Thanks for the info. Makes sense. I get that some of the LEDs can be powered by 2 different pins from the decade counter. In this case though, doesn't the decade counter only power 1 pin at a time? So the diode prevents the unpowered pin from seeing voltage from the powered pin. But is there a risk associated with applying power to an unpowered output pin? I.e. is it really necessary in this application or is it just "good form"?I guess in the spirit of hackerology, I might just try it w/o the diodes and see if the whole project bursts into flames. But i definitely appreciate the insight of the pros.

    Awesome, totally makes sense. Thanks for the explanation!

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  • HackerBoxes 0004: Three Fives Replica and 555 Timer Experiments

    I built the giant 555 project as soon as my box arrived. Very cool! In my experience, most "scale" models have been scaled down. I love that this one was a scale up.I built a Larson scanner this afternoon. Totally awesome for a guy who grew up on Knight Rider and BSG. (Remember in the opening credits for the A-Team when Templeton "Faceman" Peck A/K/A Starbuck encounters a Cylon at Universal Studios?! Priceless.) Anyway, building this was a lot of fun!One questions for the experts: Why are the diodes upstream of the LEDs necessary?

    I built the giant 555 project as soon as my box arrived. Very cool! In my experience, most "scale" models have been scaled down. I love that this one was a scale up.I built a Larson scanner this afternoon. Totally awesome for a guy who grew up on Knight Rider and BSG. (Remember in the opening credits for the A-Team when Templeton "Faceman" Peck A/K/A Starbuck encounters a Cylon at Universal Studios?! Priceless.) Anyway, building this was a lot of fun!One questions for the experts: Why are the diodes upstream of the LEDs necessary?

    I built the giant 555 project as soon as my box arrived. Very cool! In my experience, most "scale" models have been scaled down. I love that this one was a scale up.I built a Larson scanner this afternoon. Totally awesome for a guy who grew up on Knight Rider and BSG. (Remember in the opening credits for the A-Team when Templeton "Faceman" Peck A/K/A Starbuck encounters a Cylon at Universal Studios?! Priceless.) Anyway, building this was a lot of fun!One questions for the experts: Why are the diodes upstream of the LEDs necessary?

    View Instructable »
  • HackerBoxes 0002: Stepping up to ARM32, MCU Video, Wii Nunchuck

    I finally sat down to play around with the "Cool" Arduino and the TFT shield. I've been through a bunch of libraries and troubleshooting, but all I get on the display is multicolored snow. Anybody have any guidance for a super-novice?

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