could you please tell me where to connect ground terminal on Arduino Uno, when giving analog input from signal generator ?
thanks...
Sure. It's a pin labeled GND on the board. You can't miss it. It's right next to the pin labeled 5V.
Thank you raschemmel... I will connect my analog input(sine wave 3.3V) between the pins A0 and GND(which is next to 5V) and proceed with my testing... Thank you.
Is the sinewave AC or DC ?
As far as I know, function generator generates AC sine wave and that is the input I am going to give to my Arduino uno board on A0 pin and GND to the pin beside 5V. Do you mean the Inverter output as DC sine wave ? I don't have any idea what a DC sine wave is. Please clarify this concept to me.
And, Do I need to use Aref pin, while connecting analog inputs ?
Thanks...
A DC sine wave is one where the polarity never reverses, ie the trough is still +ve or zero, never negative.
I may be wrong but I don't think you can / should apply -ve voltage, ie an AC sine wave, to the Arduino, since then the pin is -ve wrt to ground.
Thank you JimboZA for your reply.
I will simplify my question. Can I apply the output of signal generator to Arduino uno ?
Can I apply the output of signal generator to Arduino uno ?
I think I answered: as far as I know, no- not if the signal is AC ie the trough is -ve wrt the ground.
If it's all positive, even the trough, then yes, why not, as long as it's not over 5V at the top. It's really no different from the standard ide example with a potentiometer varying the input between 0 and 5.
Sorry for my ignorance. Please tell me how to filter out negative voltages from the sine wave generated by a signal generator ? is there any general setting for doing so ?
sine wave i
is simply a name that describes a waveshape, irregardess of the the min/max voltage. It is true that usually sinewaves are AC but they need not be so to be called sinewaves.
When applying an AC signal to the arduino A0 pin it is necessary to couple it with a seriels 1uF cap. (it can be as much as 4.7 uF) with the + lead of the cap as the input if it is a polarized cap. It is also useful to add a voltage divider of two 4.7 k ohm resistors with the input and cap connected to the middle point.
Please tell me how to filter out negative voltages from the sine wave generated by a signal generator ?
If your generator has a DC offset adjustment you can use it.
If you use a voltage divider to bias it midpoint between 5V and GND, and you connect the signal through a series 1 uF cap, that should keep the signal right about 2.5V. What is the peak to peak voltage ?
it should be 5v