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Analog LED Bargraph? Answered

Does anyone know if something similar to the in-13 nixie tube exists in LED form?  I'm building something where space and energy are huge constraints, and I need something, well similar to the in-13 nixie in LED form, lol.  Any ideas?

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NachoMahma
NachoMahma

10 years ago

. An LM3916 or similar if you don't need true analog display. You can cascade some bar-graph drivers (eg, the LM3916), to get better resolution.

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andy70707
andy70707

Reply 10 years ago

I have used a 3914 with a single LED bargraph to make a thermometer, so I would suggest this. Get a bunch of these, and LED bargraphs (or individual LEDs), and although they have digital output, you can achieve PWM. They have a threshold which can be adjusted with R1 and R2 (one controls the scale, whilst the other controls the precision, and if you stick in a mid-sized electrolytic capacitor for C1, you can have them fade. I used a 100µf capacitor and you get a very fast 1 second or so fade assuming the input doesn't change too fast. so I would suggest a 470µf or even 1000 if you want it to fade nicely. Also, remember the LEDs need to be set up with a common anode, that has caught me out a few times.

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guyfrom7up
guyfrom7up

Reply 10 years ago

as in components? theyre fine, lol

my current plan is to use 8 leds, each pwm controlled, and put through a diffuser to give a continuous appearance while the top most lit led can vary intensity to vary the last few mm

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Goodhart
Goodhart

10 years ago

Have you considered a backlit LCD ?

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guyfrom7up
guyfrom7up

Reply 10 years ago

briefly, I'm trying to make a tron-esque watch and I feel like an LCD wouldn't give me enough contrast to give me the look im looking for.

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Goodhart
Goodhart

Reply 10 years ago

Ah yes, I see......quite a few things would work "except" that most of them use such high voltages.....hmmmm

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The Skinnerz
The Skinnerz

10 years ago

led illuminating a normal thermometer could work, depending on the optical properties of the fluid, it could even act like an optical fibre. If the heat source is somewhere else, you may have to connect the bulb with a capiliary. overall, the only power is used to for illumination.

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guyfrom7up
guyfrom7up

10 years ago

I was thinking of something along the lines of pwm an led at the bottom of a diffuser to somehow translate into a varying column of light, but it may just diffuse out and give no real good contrast with what is on and off, if u know what i mean

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steveastrouk
steveastrouk

10 years ago

Not really. An IN-13 is a truly analogue device, an LED is always discrete

Steve