Hi,
Basically I've decided to get into electronics more and therefore I am strictly a beginner.
Part of one of my projects is a LED bar graph driven via LM3914.
I am running it via a Arduino kit which supplies me with a 5V source and I've made it output a trial signal varying between 0-5V (basically over a period of 1 minute). Prototyping on a breadboard.
However, when I hook it up like in the first example of the data sheet or some other arrangements (some of which I've seen in other posts), ALL the lights remain lit and the only change is that the LEDs themselves seem to get brighter as the signal voltage increases!
My latest pin layout is as follows:
2) GND
3) 5V source
4) GND
5) Arduino analog output
6) 5V source
7) GND via 1.2k resistor
8) GND
9) 5V source
As mentioned previously, I've tried other arrangements too including the one in the datasheet on page 2!
I've tested voltages on all pins and got what I expected, including the signal source from the arduino unit.
I have not included the capacitor as it says its only needed for lengths greater than 6"
I do not have all the LEDs connected (ran out early) and as I am writing this post I just realised I could replace them with resistors temporarily! I'm thinking that my issue is not having all the LEDs connected, something I'll have to try tomorrow. Is this my problem?
Any help would be greatly appreciated!
Basically I've decided to get into electronics more and therefore I am strictly a beginner.
Part of one of my projects is a LED bar graph driven via LM3914.
I am running it via a Arduino kit which supplies me with a 5V source and I've made it output a trial signal varying between 0-5V (basically over a period of 1 minute). Prototyping on a breadboard.
However, when I hook it up like in the first example of the data sheet or some other arrangements (some of which I've seen in other posts), ALL the lights remain lit and the only change is that the LEDs themselves seem to get brighter as the signal voltage increases!
My latest pin layout is as follows:
2) GND
3) 5V source
4) GND
5) Arduino analog output
6) 5V source
7) GND via 1.2k resistor
8) GND
9) 5V source
As mentioned previously, I've tried other arrangements too including the one in the datasheet on page 2!
I've tested voltages on all pins and got what I expected, including the signal source from the arduino unit.
I have not included the capacitor as it says its only needed for lengths greater than 6"
I do not have all the LEDs connected (ran out early) and as I am writing this post I just realised I could replace them with resistors temporarily! I'm thinking that my issue is not having all the LEDs connected, something I'll have to try tomorrow. Is this my problem?
Any help would be greatly appreciated!