I can see Vin on the Uno R3 board but where do I find the V1 & V2 outputs in the attachment experiment
Thanks
V1V2.doc (35 KB)
It's Arduino pins 11 and 3 not V1 or V2
Are they pins 3 & 11 of the Atmega or the riser on the edge of the board? What is the difference between pins 3 & 11 and V1 & V2 in the attached diagram? if V1 & V2 are the same as pins 3 & 11 what is the actual wiring for this basic experiment?
Thanks again
This experiment relates to a downlod at;
We are not getting too much information here.
Assuming this is an UNO.
Pins D3 an D11 are PWM outputs found on the UNO black header pins.
Looks like they are feeding a band pass filter (no low or high frequencies).
The terminals on the left hand side of the circuit are connected to Arduino pins 3 & 11.
The terminals on the right hand side of the circuit are connected to 2 inputs of an oscilloscope.
The Arduino is programmed to generate a varying PWM signal on pins 3 &11.
The circuit filters the rectangular pulses from the Arduino, and converts them into a sinewave (or another waveform, depending on which experiment you are doing.)
V1 and V2 are not the same as pins 3 and 11.
You would see a rectangular waveform on pins 3 and 11, and a sinewave on pins V1 and V2.
dalpets:
I can see Vin on the Uno R3 board but where do I find the V1 & V2 outputs in the attachment experimentThanks
V1 and V2 are not on the Arduino, they are terminals on the circuit that you need to build/buy in order to do the experiments.
This experiment is one of a number of learning online tutorials provided by Tektronix, in relation to the probing of Arduino circuits with an oscilloscope. The actual download site is shown in the previous thread, but for convenience I have posted a *.doc attachment, including tutorial no.2, which is the subject of the OP.
It is not clear, but it seem as if the additional circuitry shown is the sum total of the tutorial wiring setup. Do you think V1 & V2 OUT then are intended to be probing terminals on the breadboard?
The code for this experiment is provided in attachment 2.
Thanks again.
Arduino probing.doc (1.06 MB)
SigType2Sine code.doc (36 KB)
The external circuitry is a filter to turn the square waves into something more like a sin wave. It is known as a single order low pass filter.
I've built the circuit, and done the experiment.
The results are shown below.
The first picture is the PWM outputs of pins 3 and 11.
(Note that this is not the standard Arduino PWM, but a faster PWM generated specially by the experiment's sketch).
The second shows pin 3 and V1.
You can see how the PWM signal is filtered to become a sine wave.
The third shows the cosine and sine waveforms on V1 and V2.
