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  • Synergizing the Beauty of Mathematics and Art

    just love it, it is really awesome. would like to make 10-13x larger one and hang it in the backyard. zen...

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  • ESP 8266 Standalone WiFI Relay Control [ytUt]

    just stumbled on this page and noticed that relay circuit in step7 is not correct.as some have already commented, output of ESP-01 is low when active. so there need to be another resistor (pullup) between GP2 and 3.3V. but more importantly transistor in that circuit is connected backwards (C and E are swapped - when facing BC547 as shown, terminals from left to right are CBE and not EBC). with these two modifications hardware side of the relay circuit can work.

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  • nice ible... thanks for sharing.btw. how can a photo cause flickering? that is a single static image frame...if you still can see flickering, your display is at fault - or more precisely its power supply or background light inverter. try different monitor and see if the problem goes away.i checked video and at there is indeed flickering at 5:56 but this is from interference of background light with camera scan rate not from LED display.I just checked datasheet and XL4016 is a "low ripple" DC/DC regulator with filtered output up to 8A (http://www.xlsemi.com/datasheet/xl4016%20datasheet... but actual ripple value is not mentioned anywhere. Btw. lower current draw means lower ripple.according to linked LED strip data, LEDs draw 5.6W per meter. So 10m strip draws 56W which at 12V is…

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    nice ible... thanks for sharing.btw. how can a photo cause flickering? that is a single static image frame...if you still can see flickering, your display is at fault - or more precisely its power supply or background light inverter. try different monitor and see if the problem goes away.i checked video and at there is indeed flickering at 5:56 but this is from interference of background light with camera scan rate not from LED display.I just checked datasheet and XL4016 is a "low ripple" DC/DC regulator with filtered output up to 8A (http://www.xlsemi.com/datasheet/xl4016%20datasheet... but actual ripple value is not mentioned anywhere. Btw. lower current draw means lower ripple.according to linked LED strip data, LEDs draw 5.6W per meter. So 10m strip draws 56W which at 12V is about 4.7Amp. if we consider this load to be resistive - that would be equivalent of 2.57 Ohm. RC time constant (with shown filter cap of 1000uF) is 2.57ms. that is short enough to cause flicker - if the period of oscillator is similar or slower. but it is not... 180kHz means that DC/DC converter period is only 5.56us (500 times faster) indicating that this is indeed very hard filtered output with low ripple. no surprises here since according to datasheet intended use for this chip is in TVs as well.

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  • panic mode commented on kludge77's instructable Gummy Bear Axe

    nice ible... thumbs up.

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  • clean and simple... good job.

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  • 74LS164 does not have latch. still it can be used to control multiple characters. one option is to simply use one 74LS164 for each digit. this can only work if displays are individual and not multiplexed. if they are multiplexed (which is common when they are one display unit) you need also something to select and power one digit at a time (L293x will do).

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