NodeMCU BT Wrist Hand Flame Flash IDK


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There is nothing up my sleeve .. save for this giant WIFI and Bluetooth enabled flash paper igniter.

With a sleight of hand .. a touch of the screen .. and poof.

No one is paying attention any ways bcz they are looking at their phones too.



1. Prototype .. read the room.

2. NodeMCU (wifi) + HC-05 (not BLE) + TIP120 (relays) shd be a maker board. "VijeCU"?

3. Bcz the glow plugs are simply resistance wire coils, they gnd the circuit. MOSFET was attempted yet interference troubled the MCU+BT. For a more immediate impatient solution, we must use mechanical relays. Huge, bulky, module, relays....

4. WTH happen to those Radio Shack drawer 'mini' 5V relays?!

5. Isolate.

6. "Fallen Hero" by Emily M. Klassen

7. Updated version due to 'actual' teaching use by a STEM educator. Includes more remote firing housing and a toggle on/off switch .. the switch is most exciting to me.

Standard Tesselated Geometry - 114.58 kB - 01/29/2019 at 20:16


SSEYO Koan Play File - 572.34 kB - 01/29/2019 at 20:15


  • 3 × Glow Plug
  • 1 × NodeMCU 12E
  • 3 × AA
  • 1 × HC-05 BT Module
  • 1 × Flash Paper

View all 7 components

  • Updated STEM?! Version

    Vije Miller05/26/2019 at 21:12 0 comments

    I often abandoned and recycle projects for other projects but this particular project projected to project the -uh- what I mean is that a STEM educator has been utilizing this device for flashy (pun) teaching and after much abuse, required an updated version -- which was hobbled together. This time 'round - toggle switch!

  • Endangering Children is Proper Fun

    Vije Miller02/23/2019 at 16:08 0 comments

    Technology students at a local private school had a go with bluetooth and wifi enabled dousing distances with puffs of flames.

  • NodeMCU Snagglebluetooth Only Versio

    Vije Miller02/02/2019 at 22:02 0 comments

    // Magic Flame Hand Thing
    // Bluetooth Only Version
    // Vije Miller
    // Pins
    int one = D0;
    int two = D1;
    int thr = D2;
    // Burn Time
    int burn = 2500;
    int mix_burn = 2000;
    void setup() {
      pinMode(one, OUTPUT);
      pinMode(two, OUTPUT);
      pinMode(thr, OUTPUT);
      digitalWrite(one, LOW);
      digitalWrite(two, LOW);
      digitalWrite(thr, LOW);
    void loop() {
      if (Serial.available())
        char data;
        data =;
        if (data == '1') {
          digitalWrite(one, HIGH);
          digitalWrite(one, LOW);
        else if (data == '2') {
          digitalWrite(two, HIGH);
          digitalWrite(two, LOW);
        else if (data == '3') {
          digitalWrite(thr, HIGH);
          digitalWrite(thr, LOW);
        else if (data == '4') {
          digitalWrite(one, HIGH);
          Serial.write("Bomb's Away");
          digitalWrite(two, HIGH);
          digitalWrite(one, LOW);
          digitalWrite(thr, HIGH);
          digitalWrite(two, LOW);
          digitalWrite(thr, LOW);

  • Stouty Wristuals

    Vije Miller02/02/2019 at 05:38 0 comments

  • Not Enough OJ

    Vije Miller01/31/2019 at 23:43 0 comments

    Lesson in futility ... and a reminder why I hate fancy products.

    Needs perhaps just 1 more battery .. to which then I no longer care .. having reached my official project-tolerance-epoch.

    Those with patience, money and steady soldering hands are welcome to venture onward.

  • Ugh

    Vije Miller01/30/2019 at 00:56 0 comments

    After a complete tear down of the TIP120s from the board believing they were wired wrong -- they were not -- and after some wild testing -- it appears that the glow plugs being a mere resistance, are grounding the entire circuit.

    Now .. permitting that I am not wise in the ways of electrical engineering .. this will require all my internet-ing slash begging for assistance skills.

    Following this .. will more than likely transition to 2N2222 NPNs for the switch bcz they are easier to manage on the scale of the project.

  • Proto-tpynig

    Vije Miller01/29/2019 at 20:15 0 comments

  • NodeMCU + BT + (3) TIP120 Shd be a thing ...

    Vije Miller01/28/2019 at 16:45 0 comments

    For any entrepreneurs out there .. this .. this shd be a thing .. but refined of course.

    NodeMCU + HC-05 Bluetooth Module + 3 TIP120 (60V Relays)

    Offers WIFI and BT IOT capabilities for up to 3 low voltage .. things. A veritable maker's paradise.

    Point is .. a large majority of my projects and other's-maker's projects would embrace a primal integration of these elements in to a refined minute board. None of that learning complex AT cmds for ESP or BLE non-sense .. #MakeMakeMakeAgain

    Hey, @Benchoff .. HaD branded board?

  • Version 0.5 Abandoned-ish

    Vije Miller01/26/2019 at 17:21 0 comments

  • Version 0.4 Abandoned

    Vije Miller01/25/2019 at 11:26 0 comments

View all 12 project logs

  • 1
    Step 1

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Martin wrote 02/18/2019 at 09:56 point

Of course the ancient TIP120 (darlington ) would be  lousy driver for the low voltage (2V?) glow plug. But that is for sure no justification to use a bulky relay. There are MOSFETs available down in the sub-milliohm range.

Also needing "just one more battery" is a little crazy approach to the problem of too high internal resistance and too little available current. It's better to use less but bigger cells. E.g. two double AAs (NiCd ?) and a small step up for the electronics. Or use a sufficcient LiPO cell.

Or 2 big cells and one small in series. The glow plug will of course be connected to the tap and switched with MOSFETs to GND.

  Are you sure? yes | no

Vije Miller wrote 02/19/2019 at 06:01 point

Tried various N/P MOSFET-s ... circuit gnd and failed.

Relay modules were on hand (supplies and funds limited).

"extra battery" due to isolating glo plug drain.

Could create a more complex circuit but .. mechanical engineer, not electrical .. oh yeah and I don't care; see notation #1 and/or project 1 thru 75.

Tone the smug down to a 3 .. this is not a weapon for the Pentagon. 

  Are you sure? yes | no

Martin wrote 02/21/2019 at 11:12 point

Excuse me, if I sounded too harsh. As a professional electronics developer I often (have to) have a very critical point of view regarding circuits and solutions.

The difference to the weapons for the Pentagon (which should reliably kill): The products I mostly work on should reliably NOT kill. :-) 

In the case of this project one of my priorities would have been a very small and compact size to make it easy to hide. But often it is enough if it just works. :-)

  Are you sure? yes | no

Vije Miller wrote 02/21/2019 at 22:43 point

In re: to your re: .. much like the Pentagon, I too forgive.

Besides, we mechanical-ists are all too aware of the disposition of you, electrical-ists. :-) .. but I am sure we can then agree that those software blokes, a bunch of ----

Compactness was the original intent (i.e. tips) but as is the case with 98.47% of my projects (..and life) time and money are luxuries I simply do not have .. thus function often trumps vanity for the sake of progress and sanity.

Adapt. Program. Survive.


  Are you sure? yes | no

Dan Maloney wrote 01/31/2019 at 15:38 point

I simultaneously want to see the video, and don't want to see the video...

  Are you sure? yes | no

Vije Miller wrote 02/02/2019 at 23:14 point

#PirateWorldProblems .. that's an eye patch joke.

  Are you sure? yes | no

Mike Szczys wrote 01/29/2019 at 22:03 point

Ooof, that kind of makes me queasy to see those so close to your wrists/palms... invest in burn cream ;-P

  Are you sure? yes | no

Vije Miller wrote 02/02/2019 at 23:13 point

The sweat from the stress of the thought of it exploding on my wrist acts as a natural flame retardant.

  Are you sure? yes | no

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