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  • Using a 4 Digit, 7 Segment Display, With Arduino

    Hey nice catch! I just went through the library and in the definition for the begin() function I see the parameter "bool resOnSegmentsIn=0" you were talking about.I'm glad you found this, and further along in the library it is clear that this parameter affects how the display updates its value and if assigned a value inconsistent with the electrical schematic used, then some LEDs would be powered unequally and some would perhaps completely burn out. However, I'm not sure how this would throw an Error if the parameter has been assigned to a default parameter of 0 though? The whole point of default parameters is that the compiler won't throw an Error if a parameter is not assigned a value when the function is called.In any case, I will update the code and add a comment to indicate…

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    Hey nice catch! I just went through the library and in the definition for the begin() function I see the parameter "bool resOnSegmentsIn=0" you were talking about.I'm glad you found this, and further along in the library it is clear that this parameter affects how the display updates its value and if assigned a value inconsistent with the electrical schematic used, then some LEDs would be powered unequally and some would perhaps completely burn out. However, I'm not sure how this would throw an Error if the parameter has been assigned to a default parameter of 0 though? The whole point of default parameters is that the compiler won't throw an Error if a parameter is not assigned a value when the function is called.In any case, I will update the code and add a comment to indicate to users that if they want to deviate from the schematic and use 8 resistors on the 8 segment pins they would have to change the code.Thanks you both for starting and finishing this inquiry.

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  • Using a 4 Digit, 7 Segment Display, With Arduino

    Convince me why a resistor per segment is better than a resistor per digit and I will edit. The instructions so far work and don’t burn out any LEDs so perhaps your solution will save some power?? I think both solutions accomplish the same thing because the internal wiring in the segment (a multiplexing setup) has all of the connections between connected LEDs in series so it shouldn’t matter where you put the resistors, as long as every LED has one in either of its respective series’ (the series where all of the A-segments are connected or the series where all of the segments in the 3rd digit are connected). I opted for putting resistor on the digit pins because it would require less resistors (I.e less $, less work, more organized breadboard). The only evidence I’m getting to put them on…

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    Convince me why a resistor per segment is better than a resistor per digit and I will edit. The instructions so far work and don’t burn out any LEDs so perhaps your solution will save some power?? I think both solutions accomplish the same thing because the internal wiring in the segment (a multiplexing setup) has all of the connections between connected LEDs in series so it shouldn’t matter where you put the resistors, as long as every LED has one in either of its respective series’ (the series where all of the A-segments are connected or the series where all of the segments in the 3rd digit are connected). I opted for putting resistor on the digit pins because it would require less resistors (I.e less $, less work, more organized breadboard). The only evidence I’m getting to put them on the segments is “multiplexing” and “this guy has done it totally wrong.” Expand and let’s see if we could get to the bottom of which one is better...

    Convince me why a resistor per segment is better than a resistor per digit and I will edit. The instructions so far work and don’t burn out any LEDs so perhaps your solution will save some power?? I think both solutions accomplish the same thing because the internal wiring in the segment (a multiplexing setup) has all of the connections between connected LEDs in series so it shouldn’t matter where you put the resistors, as long as every LED has one in either of its respective series’ (the series where all of the X-segments are connected or the series where all of the segments in the Y-digit are connected). I opted for putting resistor on the digit pins because it would require less resistors (I.e less $, less work, more organized breadboard). The only evidence I’m getting to put them on t…

    see more »

    Convince me why a resistor per segment is better than a resistor per digit and I will edit. The instructions so far work and don’t burn out any LEDs so perhaps your solution will save some power?? I think both solutions accomplish the same thing because the internal wiring in the segment (a multiplexing setup) has all of the connections between connected LEDs in series so it shouldn’t matter where you put the resistors, as long as every LED has one in either of its respective series’ (the series where all of the X-segments are connected or the series where all of the segments in the Y-digit are connected). I opted for putting resistor on the digit pins because it would require less resistors (I.e less $, less work, more organized breadboard). The only evidence I’m getting to put them on the segments is “multiplexing” and “this guy has done it totally wrong.” Expand and let’s see if we could get to the bottom of which one is better...

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  • lol "indestructible" if that is a typo or not it definitely fits the bill when describing this instructable. Great job with the tutorial describing the process and the designs are AMAZING. PS im trying to get a delta printer. Can you tell me which of yours you would say is better based on print size, price, and precision / accuracy?

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  • Might be something wrong with your arduino board. You can determine if this is the case my light a single led with the pin on the arduino that lights up the decimal point. Use a simple LED blink sketch and if the LED does not light up that means your arduino is broken. If this is the case you can just change the code and the schematic so that it uses a different pin. If it does work then double check the code. Otherwise I have no idea.

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  • It isn't a problem with the library but it is a problem with the code because when I first got this I had to match the segments to the way that the libraries turned on each segment for each number. So I had to try a whole bunch of variations until I found what I THOUGHT was the right variation. Because you guys are having this problem I am guessing that I found the wrong one. Shouldn't be to hard to fix. I will try to fix it ASAP which might not be until the weekend (school). Thanks for informing me of your problems.

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  • "If i type 2222, 3333, 3141, 2141, 2888, 3888 etc wherever i put the 3 or the 2 it will show a 0 missing the lower left segment."I am a little lost when you say "it will show a 0 missing" because there is no 0 in the numbers 2222, 3333, 3141, etc....Are you saying that one of the segments are not on?If so which segment? _I _ II _ I

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  • Yeah I agree, 220Ω are fine just brighter i think.

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  • This is simply amazing and joetomel's comment about considering the options of solar power is excellent. Imagine being able to heat an entire building off of oxygen and hydrogen gasses taken from water with solar power. 100% Natural!!

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  • Looking at the schematic it seems as though you are literally creating a short-circuit with a li-po battery. From my RC days I know that it is extremely dangerous to short-out a li-po or any other battery for that matter, in fear for explosion. Because yours has not exploded, and is instead creating energy in the form of heat, what kind of wire are you using?Great InstructableGreat Workshop

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  • thank you so much for these links!!!!

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  • where on earth did you buy your electronics (stepper motors, A4988, and the hardware like the couplers and stuff). Most stepper motors are around $15 a pop and you need at least two so that already uses $30 of the $50/$60 price statement. As for A4988 they are at least $10 and you again need 2 of them resulting in $20 added to the $30 totaling in $50. So you spent $10 dollars on the wood, hardware, arduino, making the pcb, etc?Please share!!!!!!!!!!! Those are some sick deals

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