SR-25 homemade HPA engine with Bluetooth FCU update - 50rps and more :)

[@airsoftargonaut3738]

Nice to hear an English voice behind this project! Great work

[@FreedomAirguns]

That's actually awesome. You should make some drop in kits and sell them!

[@JanHoving77]

Hello, I have a question. Is the Bluetooth/Arduino code already available? Would like to build something like this myself.

[@No1sonuk]

An option I like on my GATE Titan is burst/auto mode in the auto position. This basically fires the n-round burst then looks at the trigger - if the trigger is still pulled, it just carries on firing auto with no discernible delay. This means if you just flick the trigger, it fires an n-round burst, but if you hold the trigger, it fires full auto.

[@No1sonuk]

I'd be interested to know the details of the valve, FCU, etc. please.

[@ianisciuperca]

Can you make a video where you assemble it?

[@TheGiuse45]

Hi, those solenoid valves say min activation time is 0.05 s so max 20 rps... How are you getting 50 rps?

[@vp1xel687]

Hey there i was wondering if i could get the Arduino Sketch for this? and the name of the app being used as i am trying to make a project similar to this.

[@laurynasmazeika3351]

Hey man, how long is the signal to open the solenoid valve? (How long you keep it opened?)

[@jorgevargas3483]

is it possible for you to share the details of this electromagnet coil?

[@TheDjjeanb]

hey great job, any chance you release the arduino sketch and android app?

[@pizzatimecomedy3403]

This is so cool!

[@leighhodson6800]

Thats running nicely. Any chance you might share your arduino sketch?

[@koplandavid]

how much pressure do you need for solid fps?

[@maunladbalesandusedclothin3227]

can you share the code

[@2roti]

With the small sizes of the new lipo are you having in mind to go further with the coil project? Nice job

[@koplandavid]

can you drive solenoid directly from the arduino nano?

[@Snakebitey]

David Koplan you need a driver, like a MOSFET - the Arduino can only supply ~40mA itself.

[@koplandavid]

Hey I recreated the design.... and have problems getting the info through the bt module. Could you send me the arduino sketch it would be really helpful.

[@BERESHIDA2008]

any uptade on this design will be nice

[@Snakebitey]

It works, I posted a scopecam vid of it a lil while back too. I'll be working more on the electromagnetic engine soon.

[@BackdraftAirsoft]

what fps does this get?

[@Snakebitey]

It's capable of 550 fps with 0.20 g at the max pressure the valve can handle. It wasn't the most efficient engine though and liked to tear up hop buckings if it wasn't perfectly aligned. I rebuilt the SR-25 later with a small HPA tank in the stock and a Wolverine Reaper engine to get the most out of it. Got a video on that on the channel.

[@BackdraftAirsoft]

@@Snakebitey What solenoid do you use? My engine isnt even close to that fps. It caps out between 250 and 280 with .28g bbs at 120 psi.

[@Snakebitey]

@@BackdraftAirsoftI think it's an airtac 3V110-06 with 12 Vdc coil

[@Nazrac79]

Any chance I can get the source to your FCU?

[@Snakebitey]

Charles Estes It's a bespoke script I wrote to go with the Bluetooth app, so won't mean anything by itself. it's being constantly revised so when I'm on a more final version I'll publish it all!

[@Nazrac79]

Mainly I wanted the arduino sketch. I want to see how you handled semi auto. My program is IMHO not that great. I am used to ladder logic and if I put a PLC in there I could make it do all sorts of things, but...

[@Snakebitey]

Charles Estes I use a while loop that stays looping while the trigger is held - it just can't continue the script until the trigger is released. It might not be the best way but it works...

[@Nazrac79]

No I actually like that better than my way. I was setting a bit and then doing a goto bypassing the main script until the trigger is released. Kinda a latch and unlatch.

[@jiachunyuan8742]

amazing

[@---GAME-MANIA----]

Hi! looks cool. I also rework my Gear to Hpa. please give a link to the sketch and the name of the program on your phone to control the Arduino, or where it can be downloaded. thank you in advance.

[@BelgianWaffleAirsoft]

i got an a&k sr25 just laying around here doing nothing so this would be insta buy for me!

[@nutzerab18]

Nice :)

[@jessecowle4070]

Neat stuff. If you're interested you should check out my facebook page ( cowle airsoft) lots of homemade hpa engines.

[@rangerup100]

Hello, my name is Kevin Forney, you may recognize my name from the KC02 Facebook page if you are on it, I am working on an ambitious HPA project and I’m not great with electronics. I am looking for some help on the electronic portion of it. If you would be willing to i would greatly appreciate it. Thanks in advance

[@Snakebitey]

Heya - I do indeed, I have one of your pistons in my KC-02 :) I'd love to help out but I won't have time for a new project for a few months. Please let me know if you have some questions though and I'll do my best to help out!

[@rangerup100]

Snakebitey thank you for the response! If you could send me a friend request on Facebook I would love to discuss the project with you. It will be a few months till I’ve finished the mechanical part of the kit so I’m in no rush. Thanks again!

[@Snakebitey]

Clarksville, Tennessee?

[@rangerup100]

Yessir!

[@Snakebitey]

Incoming :)

[@GenuwineG]

I’ll give you $ 9.95