dnd 5e – Can a second character remove a willing PC’s shield?

It takes an action to don and to doff a shield (See Pg 146 of the PHB).

Does that action need to be the PC’s action, Or, could another member of the party (another PC), or even a familiar with opposable thumbs (eg. Imp, Sprite), spend their action to remove a willing player’s shield?

Example: P1 is wedged under a boulder. P2 needs P1’s shield. Can P2 remove P1’s shield as an action?

dnd 5e – Can a second character remove another willing PC’s shield?

It takes an action to don and to doff a shield (See Pg 146 of the PHB).

Does that action need to be the PC’s action, Or, could another member of the party (another PC), or even a familiar with opposable thumbs (eg. Imp, Sprite), spend their action to remove a willing player’s shield?

Example: P1 is wedged under a boulder. P2 needs P1’s shield. Can P2 remove P1’s shield as an action?

dnd 5e – Can a second character remove another willing PC’s shield?

It takes an action to don and to doff a shield (See Pg 146 of the PHB).

Does that action need to be the PC’s action, Or, could another member of the party (another PC), or even a familiar with opposable thumbs (eg. Imp, Sprite), spend their action to remove a willing player’s shield? What about unwillingly removing the shield from a second player?

Exhibit A: P1 is wedged under a boulder. P2 needs P1’s shield. Can P2 remove P1’s shield as an action?

Exhibit B: An invisible imp sealthily unbuckles the shield of an opponent, right before its master launches an assault. Assuming successful conditions (stealth, strength, slight of hand, etc… check) would the familiar be able to unfasten the shield (action)?

dnd 5e – Can an ally or familiar with opposable thumbs (Imp, Sprite) doff and/or don the player’s shield for them?

The short answer is that it is up to the DM. I couldn’t find any supporting rules specifically about getying help into or out of armor. However….
Climb onto bigger creatures

As an alternative, a suitably large opponent can be treated as terrain for the purpose of jumping onto its back or clinging to a limb.

This rule allows small creatures to climb onto you and at least attempt to buckle the shield in place.

Doff and Don armor
Says:

Don. This is the time it takes to put on the item. You benefit from it’s AC only if you take the full time to don it.

Doff. This is the time it takes to take off the item. If you have help removing armor, reduce this time by half.

So at the very least they can help.

dnd 5e – Can I use Shield Spell to protect me from other attacks than just physicals and magic missiles?

No, the shield spell will not stop dragon breath.

Yes, the shield spell may stop some spell attacks that use an attack roll

The shield spell increases your armor class, making it harder to hit you when someone or something makes an attack that requires an attack roll to hit you. As with any method used to increase your armor class, you are more difficult to hit, not impossible to hit.

A damage dealing effect that ignores your armor class, such as dragon breath, is not an included case for shield, neither is any spell that calls for a saving throw to avoid damage from it. (For example, the Sacred Flame cantrip, which requires a Dexterity Saving Throw1).

From the shield spell’s description:

Casting Time: 1 reaction, which you take when you are hit by an attack or targeted by the magic missile spell. {snip} Until the start of your next turn, you have a +5 bonus to AC …

What’s an attack in this sense? It’s an action in combat that uses a roll to beat a score on a d20 that will hit your armor class for your reaction to put the shield up.

Some spells require the caster to make an attack roll to determine whether the spell effect hits the intended target. Your attack bonus with a spell attack equals your spell casting ability modifier + your proficiency bonus. Most spells that require attack rolls involve ranged attacks. (Basic Rules p. 81)

A different class of attacks require saving throws, where armor does nothing for you.

Saving Throw Many spells specify that a target can make a saving throw to avoid some or all of a spell’s effects. The spell specifies the ability that the target uses for the save and what happens on a success or failure. Basic Rules p. 81)

Magic Missile is a Special Case

The spell description calls out a specific feature of shield, which is that it prevents any damage from magic missile. No other specific exceptions are made. That one spell is the single specific spell attack that does not need to make an attack roll to hit you that is nullified by shield. The “why” seems to be “tradition.”

  • Historical note: that feature of shield was originally introduced in 1e AD&D (PHB p. 68) and has been retained throughout each edition since. When magic missile was introduced, Greyhawk, Supplement 1 to OD&D, shield (which was in the original game’s core three books) did not automatically block anything. Shield originally provided a high armor class against missiles (2) and a solid armor class against melee attacks (4) for the Magic User. In that edition, lower armor class meant better protection.

No other attack that does not need an attack roll to do damage to you — fireball, lightning bolt, dragon breath — is included as an exception (nor ever was in previous editions). If the attack does not have to deal with your armor class, then the attempt to do damage to you is not blocked by shield.

Some attacks that call for an attack roll will hit you even if shield is up, such as any attack roll of a natural 20 on the d20, or any roll that is equal to or greater than your armor class. (If you had a 20 Dex and a +1 RoP, shield’s +5 gives you and AC of 21 but a natural 20 still hits you).

Alternate ruling1

Based on the spell’s language, a DM could rule that any attack (even if it did damage) would raise the shield and boost your AC if you used your reaction to raise the shield. For example, if a hostile tempest cleric cast sacred flame or shatter against you, and didn’t kill you, that attack hitting you could trigger the shield and the volley of arrows from his band of skeletons would need to hit the higher Armor class. But that’s not necessary, due to the point about the triggering attack: if, of four arrows, the first missed, and then the next two hit, the first one hitting “triggers the reaction,” blocking that arrow and perhaps the next hit … but that fourth arrow where the skeleton rolled that 20 still hit. Seems to me a zero value added improvisation.

dnd 5e – Does Shield Master only grant DEX save bonuses vs. single-target spells?

The 2nd benefit of the Shield Master feat (PHB, p. 170) says:

If you aren’t incapacitated, you can add your shield’s AC bonus to any Dexterity saving throw you make against a spell or other harmful effect that targets only you.

So you do not gain the save bonus for AoE spells.

However, the third benefit of the spell does apply to AoE spells, effectively giving you Evasion from AoE spells for all points in space in the same area/same direction over the remainder of the turn:

If you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you can use your reaction to take no damage if you succeed on the saving throw, interposing your shield between yourself and the source of the effect.

Since this most reactions last for the remainder of the turn, and as long as additional AoEs are coming from the same point in space, your shield will continue to provide this Evasion effect.

So there are maybe 6 spells that qualify for the 2nd part of the feat – but a lot more that qualify for the 3rd part of the feat, since it includes all spells that require a Dexterity saving throw.

Just don’t confuse the two parts of the feat!

dnd 5e – Are the targeting-based restrictions for Twinned Spell metamagic and the Shield Master feat treated differently?

Yes, the ruling is different.

Twinned Spell states:

a spell must be incapable of targeting more than one creature at the spell’s current level.

So Twinned Spell is concerned not only with what the spell is doing right now, but also the full range of the spell’s potential at this level. Even if a spell will target only one creature for the entire duration of its casting this time, if it is even capable of targeting more than one creature at this level, it cannot be twinned.

As you have observed, the language of Shield Master is different:

you can add your shield’s AC bonus to any Dexterity saving throw you make against a spell or other harmful effect that targets only you.

This does not mention anything about the spell’s potential, so as long you are the only target at the moment, you may use Shield Master, even if there is the possibility that the effect can target more creatures at a different time or under different circumstances.

Note, area of effect spells target a point in space:

A spell’s description tells you whether the spell targets creatures, objects, or a point of origin for an area of effect (described below).

So for example, a fireball that only harms you would not be an eligible effect, since it targets the point in space it erupts from.

That said, there are a lot of spells and a lot of different ways spells are worded, so I must leave you with the disclaimer that your mileage may vary from spell to spell and DM to DM. There are too many spells and too little consistency between them to tell you that this ruling can be trusted every time.

An example: acid splash

Acid splash states:

You hurl a bubble of acid. Choose one or two creatures you can see within range. If you choose two, they must be within 5 feet of each other. A target must succeed on a Dexterity saving throw or take 1d6 acid damage.

Since acid splash is capable of targeting two creatures, it is never eligible for Twinned Spell, but if its caster targets only one creature, and that creature has the Shield Master feat, that creature may use it on the saving throw for acid splash.

dnd 5e – What harmful effects is the second benefit of the Shield Master feat useful against?

The term “Harmful Effects” is not actually defined by 5E, even though they use the term in several places. The closest we get to a definition is this:

Damage Types

Different attacks, damaging spells, and other harmful effects deal different types of damage.

so we go with the plain English definition. Harmful means:

causing or capable of causing harm

And Harm is defined as:

physical injury or mental damage;

Thus, we can conclude that “Harmful Effects” speaks specifically of things that can damage you. In short, by a strict usage of the English Language–that Shield Master feature applies against effects that…

  1. Only target you
  2. Require a Dex Save
  3. Deal Damage

This meshes with the Damage Types statement linked above, as it talks about Harmful Effects dealing types of damage.

I’m pulling all of these from Class Features, as they are the easiest to search

Feature works against

These class features meet all three criteria: They only target one person, require a Dex Save, and deal damage.

Storm Herald Barbarian’s Storm Aura, Sea Option

When this effect is activated, you can choose one other creature you can see in your aura. The target must make a Dexterity saving throw. The target takes 1d6 lightning damage on a failed save, or half as much damage on a successful one.

Tempest Cleric’s Wrath of the Storm

Also at 1st level, you can thunderously rebuke attackers. When a creature within 5 feet of you that you can see hits you with an attack, you can use your reaction to cause the creature to make a Dexterity saving throw. The creature takes 2d8 lightning or thunder damage (your choice) on a failed saving throw, and half as much damage on a successful one.

Arcane Archer’s Seeking Arrow

(…)If the target is within the weapon’s range and there is a path large enough for the arrow to travel to the target, the target must make a Dexterity saving throw. Otherwise, the arrow disappears after traveling as far as it can. On a failed save, the target takes damage as if it were hit by the arrow, plus an extra 1d6 force damage, and you learn the target’s current location. On a successful save, the target takes half as much damage, and you don’t learn its location.

Monk, Way of Four elements: Water Whip

You can spend 2 ki points as an action to create a whip of water that shoves and pulls a creature to unbalance it. A creature that you can see that is within 30 feet of you must make a Dexterity saving throw. On a failed save, the creature takes 3d10 bludgeoning damage, plus an extra 1d10 bludgeoning damage for each additional ki point you spend(…)

Feature does not work against

In both of these examples, you are making a Dexterity Save to evade an effect that doesn’t deal damage. Thus, the Shield Master feature does not aid you here.

Way of the Open Hand: Open Hand Technique

Whenever you hit a creature with one of the attacks granted by your Flurry of Blows
(…)
It must succeed on a Dexterity saving throw or be knocked prone.

Paladin Oath of the Ancients, Nature’s Wrath

You can use your Channel Divinity to invoke primeval forces to ensnare a foe. As an action, you can cause spectral vines to spring up and reach for a creature within 10 feet of you that you can see. The creature must succeed on a Strength or Dexterity saving throw (its choice) or be restrained.

dnd 5e – Would Subtle Spell/ Aberrant Psionics let you cast while using a shield without proficiency?

No, as these features make no mention of changing the proficiency requirement.

5th Edition uses a “specific beats general” rule:

a general rule is in effect as long as something in the game doesn’t explicitly say otherwise.

This means that for a rule to create an exception to another rule, it must be explicit. Since Subtle Spell and Aberrant Psionics make no mention of shield and armor proficiencies at all, they do not interact with them in any way. Therefore, to cast spells while wearing armor or a shield, you must be proficient, even with Subtle Spell or Aberrant Psionics.

Disparar y para un mp3 con el mismo boton en arduino uno y sparkfun mp3 shield

tengo un arduino 1 v3 y una sparkfun mp3 player shield v15. Necesito que con un mismo boton (un boton arcade) al pulsarlo la primera vez dispare un mp3 y al pulsarlo otra vez se pare. Asi en loop, intente copiar de un proyecto de ejemplo de sparkfun pero no soy capaz de que suene.

    #include <SPI.h>           // SPI library
#include <SdFat.h>         // SDFat Library
//#include <SdFatUtil.h>     // SDFat Util Library
#include <SFEMP3Shield.h>  // Mp3 Shield Library

SFEMP3Shield MP3player;


int reedSwitch = 4;

boolean active = false;


void setup() {
  pinMode(reedSwitch, INPUT); //Reed Switch
  digitalWrite(reedSwitch, HIGH); //turn on internal pullups for reed input


  MP3player.begin();
  MP3player.setVolume(0x00, 0x00); //set volume
}

void loop() 
{
  
    if (digitalRead(reedSwitch) == HIGH && !active)//when door opens
    {
      active = true;
      MP3player.stopTrack();
      MP3player.playTrack(1);
    }
    else if (digitalRead(reedSwitch) == LOW && active)//
    {
      active = false;
      MP3player.stopTrack();
  
    }
  


  delay(100);
}