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Thanks a lot for your answers @allObjects and @Gordon !
I have Puck.js v2, so I think the on-board FET will be a great solution for me.
Thank you!

Hi Everybody,
we have 4 connection points on the bottom right part of Puck: D1, D2, 3V, GND.
Is it possible to switch off this 3V/GND from software?
Many thanks for the answer!

I just found: if I re-insert the batteries after the 4) step above (without re-loading the codes), then everything work correctly. So I think it's not a problem anymore.
Thanks!

I tried now also the 2nd example ( at "Making it faster" ):
Here I have the following problem:
1) I press the button on master-puck, the green LED lights; now the red LED lights also on the slave-puck(this is OK);
2) if I press the master-puck again, the red LED is OFF on slave-puck (this is OK also);
3) I play this 3 times (on and off)
4) After the 7. button press on master-puck, the green LED is always lights on master-puck, but the slave-puck do nothing. Only if I make a reset() and a new load/code copie to the master can I run this procedure again.
5) .. and I cannot connect anymore to my slave-puck via WEB IDE, I must remove/put in again the battery

What could be the problem here?

Thank you Gordon, it's working now!
I think the require("ble_simple_uart")" on WEB IDE via "Send to Espruino" was not correctly executed - it runs now fine.

oh, sorry, my copy/paste was wrong here :-(
here is the test what I made, and I have the problem in this version:

//===========================================================================================================================================
Slave:

var on = 0;
function toggle() {
  on = !on;
  digitalWrite(LED, on);
}

--> save();

//===========================================================================================================================================
Master:

// Are we busy?
var busy = false;

// Function to call 'toggle' on the other Puck
function sendToggle() {
  if (!busy) {
    busy = true;
    digitalPulse(LED3, 1, 500); // light blue to show we're working
    NRF.requestDevice({ filters: [{ name: 'Puck.js ae23' }] }).then(function(device) {
      require("ble_simple_uart").write(device, "toggle()\n", function() {
        digitalPulse(LED2, 1, 500); // light green to show it worked
        busy = false;
      });
    }).catch(function() {
      digitalPulse(LED1, 1, 500); // light red if we had a problem
      busy = false;
    });
  }
}

// Call sendToggle when the button is pressed
setWatch(sendToggle, BTN, { edge:"rising", debounce:50, repeat: true });

--> save();

I have the pucks named "c123" (master), and "ae23" (slave).
I followed the description at https://www.espruino.com/Puck.js+Controlling+Other+Pucks
1) slave: code copied to puck named "ae23" and save()
2) master: puck name changed to "...filters: [{ name: 'Puck.js c123'..." , code copied and save()

Testing with and without loading "require("ble_simple_uart")" on WEB IDE via "Send to Espruino"

The result is always
a) master: the blue LED is on (OK), then the red LED is on (KO)
b) slave does nothing

What do I do wrong?
Thanks for the answer!

OK,thank you!

Hi,
I have a PuckJS 2 with 2v06 and a PN532 NFC v3 module from Elechouse, connected as follows:

Puck.js_D28 to PN532_SCL,
Puck.js_D29 to PN532_SDA,
Puck.js_3V to PN532_VCC,
Puck.js_GND to PN532_GND,

Puck.js works fine and the red LED on the PN532 is also active.
Actually I use the Espruino Web Ide Tool, so:
1) I wrote the require("PN532"); on the right side;
2) sent with "Send to Espruino button" - the loading was OK (screen refreshed);
3) I tried to run it as described in the example for PN532 ( scl:B6 and sda:B6 changed to D28 and D29 );

I see now the following on the web console:
...
...
2v06 (c) 2019 G.Williams

I2C1.setup({scl:28, sda:29});
=undefined
var nfc = require("PN532").connect(I2C1);
={
i2c: I2C1
}
print(nfc.getVersion());
Uncaught InternalError: I2C Write Error 33281
at line 1 col 172
...sh(0);this.i2c.writeTo(36,b);b=this.i2c.readFrom(36,6);b[4]&...

                          ^

in function "cmd" called from line 1 col 22
var a=this.cmd([2],12);return{chip:"PN5"+a[2].toString(16),f...

                 ^

in function "getVersion" called from line 1 col 22
print(nfc.getVersion());

                 ^

...
...

Can somebody help me, what could be the problem?
Thank you!