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TOPIC: how footswitch work ?

how footswitch work ? 3 years 3 months ago #732

Drwhite0910 OFFLINE New Member Posts: 3 Karma: 0	hi i'm have a problem about the process of footswitch . where a part of footswitch logic ? . i'm just see a part of setup like pinmode / define of footswitch
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how footswitch work ? 3 years 3 months ago #733

BowDown OFFLINE Senior Member Posts: 55 Thank you received: 6 Karma: 2	As far as i know, footswitch is true bypass. Meaning, if its set to bypass mode, the signal will go from the input directly to the output of pedalshield, thus there is no need for software programming.
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how footswitch work ? 3 years 3 months ago #734

Ray OFFLINE Moderator Posts: 695 Thank you received: 148 Karma: 42	yes, as nik said it is true bypass, meaning that when the effect is off or bypassed the guitar signal goes straight from input to output. The pin7 of the DUE will "feel" when the 3pdt footswitch is activated or not, the pin will be high when the effect is not working and low when is on. You can have a look at this for more info: www.electrosmash.com/forum/pedalshield-u...shooting?lang=en#535
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how footswitch work ? 3 years 3 months ago #736

BowDown OFFLINE Senior Member Posts: 55 Thank you received: 6 Karma: 2	Can you describe how a 3pdt footswitch is wired? There are 9 pins but from the picture in the forum link you provided, only 6 are used... I found this image searching for this topic.. But this image made matters even more weird...
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how footswitch work ? 3 years 3 months ago #737

Ray OFFLINE Moderator Posts: 695 Thank you received: 148 Karma: 42	I hope this image helps you: - The green is the signal flow then the effect is not working (true bypass mode). - The red flow is when the pedal is engaged. The 3PDT works connecting the middle row pins with the top pins or bottom pins depending if is pushed or not, check this again: www.electrosmash.com/forum/pedalshield-u...shooting?lang=en#535
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how footswitch work ? 2 years 4 months ago #1172

Bruno OFFLINE New Member Posts: 7 Karma: 0	And how exactly does the pin7 know that it is active ?
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how footswitch work ? 2 years 4 months ago #1173

Ray
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And how exactly does the pin7 know that it is active ?

The pin 7 has an internal pull-up, it is there by default, you dont need to define it, but in all the codes compressed in the rar file in www.electrosmash.com/forum/software-peda...-pedalshield?lang=en (I suggest you to use this codes, they are the latest and greatest) are defined to make it more clear like:

int FOOTSWITCH = 7; 
pinMode(FOOTSWITCH, INPUT_PULLUP);

So if you see, the hole circuit will be something like this:

Son when it is pushed, the pin 7 is connected to ground (and the Arduino reads a '0') and when is not pushed the arduino sees the pull-up resistor which is 3V3.
In the code is detected like this:

//Turn on the LED if the effect is ON.
  if (digitalRead(FOOTSWITCH)) digitalWrite(LED, HIGH);  // effect ON
     else  digitalWrite(LED, LOW); //effect OFF

Last Edit: 2 years 4 months ago by Ray.

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