PVS 840 thermal vision budget 50hz binocular

WIP! Parts list, Pictures, documentation,  coming up soon!

Helm mounted or handheld, the PVS 840 uses a clever external Power solution for both scenarios. Mounted on the helmet it uses a battery pack placed on the back acting as counterweight. 

Handheld it uses a single 18650 cell located in between the tubes using the otherwise unused space in a slim and light weight approach. 

Join the PVS420 Discord where you can find the ongoing development of the PVS840 and much more.

https://discord.gg/Ce9BJ2DK3j

Part list: 

Some of the following links are affiliate links. They won’t cost you anything extra, but they help support the project and its ongoing development. This allows me to recover a small portion of the costs while continuing to offer everything for free.

 Thermal camera type: 256x192 x4 / x9

https://s.click.aliexpress.com/e/_ooy6s0V

or here

https://s.click.aliexpress.com/e/_ontNcM5

18650 battery holder: 1slot 4 pieces

4 stücke ABS 18650 Power Bank Fällen 1X 2X 3X 4X 18650 Batterie Halter Lagerung Box Fall 1 2 3 4 Slot Batterien Container Mit Harten Pin - AliExpress

M3 45mm black screws: 

M3 x 45mm Innen sechs kant schrauben aus legiertem Stahl schwarz 20St - AliExpress 13

M4 12mm black screws: 

JUIDINTO 10–30 Stück Torx-Rundkopfschraube M2 M2,5 M3 M4 M6 schwarz plattiert sechs Lappen Torx-Flachkopfschraube - AliExpress

Power connector: 5,5x2.1 male and female

1 Stück 5,5 x 2,1 2,5 mm DC-Stromanschluss mit Schraubverriegelung, Buchse und Metall-Schalttafelmontage-Buchse, sicher, Standard-Steckdose - AliExpress 13

Ocular display: 2 pieces V770 Pro C USB:

https://s.click.aliexpress.com/e/_omxErFj

Voltage booster:  Remove A and B bridge for 5 Volts!!!!!!!!!!!!!

1/5 stücke 1,5 A Multi-funktion Mini Boost Modul Step Up Board 5V 8V 9V 12V LED Anzeige Diy Spannung Modul 3,7 V lithium-batterie - AliExpress 502

Push button power switch: 

10PCS 12*8MM DC 30V 1A On Off Mini Push Button Schalter für Taschenlampe 1208YD selbst Locking - AliExpress 13

Grub screws: 4 and 5 mm: 

Klasse 12,9 schwarzer Kohlenstoffs tahl Sechs kant Innen sechs kant Innen sechs kant schraube Kegels pitze Maden Stellschrauben Schrauben m2 m2, 5 m3 m4 m5 m6 m8 m10 - AliExpress 13

Digispark ATTiny85 dev board, easy to work with as with the chip alone: 

https://de.aliexpress.com/item/1005006232777912.html

dc-dc step down: to bring the 5 volt down so you can use the cameras RX/TX line:

https://de.aliexpress.com/item/1005007038244411.html 3.3Volt 

Button set:

 125pcs 25 Typen/Los Mikrosc halter Druckknopf Taktsc halter zurücksetzen Mini-Blatsc halter smd dip 2*4 3*6 4*4 6*6 DIY sortiertes Kit - AliExpress 13

Capacitor for voltage stabilization, NUCing buffer and signal cleaning: 6.3V1000UF 20PCS

10V 16V 25V 35V 50V 400V Hochfrequenz-Aluminiumkondensator mit niedrigem ESR 100UF 220UF 330UF 470UF 680UF 1000UF 1500UF 2200UF 3300UF - AliExpress 

Brass heat inserts: M4 (OD 6mm) 5mm length.

M2 M2,5 M3 M4 M5 M6 Messing Hot Melt Einsatz Rändelmutter Gewinde Wärmeform Doppel-Twill-Injektions-Einbettungsmutter für 3D-Drucker - AliExpress

I probably forgot something, so will keep adding stuff here……………..

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WIP UPDATES: 

24.03:2025

I was running into some problems as with parallel cameras the pictures would not merge  caused by “Collimation” issues.  Optics surely can ruin your day. Luckily I was quickly able to get rid of the issue by angling the cameras outwards horizontally to nicely merge both perceived pictures. 

I added 3° and 4° dummy lenses, both worked but for me I settled with 4°. 

At this point I cant tell if this works for everybody, if you still see two pictures close to each other but not merging  giving you eye strain I happy to adjust the dummy lens to your needs. 

I also heard there are lenses who are able to do the collimation like for the original PVS14?! but I have no clue how this works, so in case you have those you maybe can just print the dummy lens holders parallel and dont have to  bother with angling the cameras slightly outwards. 

Also atm I am using 4mm lenses on the 256x192  thermal cameras,  with higher magnification the outward angle also should become less  ( if chat gpt is correct)  getting 6.8mm lenses soon so I probably have to modify again and will add those dummy lenses to the bunch….. I personally have an IPD of pretty much 60mm so if you differ a lot from that I think (not sure) this again could change the whole collimation thing again……….cheeses crisps optics are complicated O.o

26.03.2025

Working on a single cell 18650 battery pack for mobile use that pretty much doesnt take up any space as the battery and electronic is placed in between both bino tubes, updated Pictures. 

I also worked on a battery pack for the back of the helmet that is listed separately. 

28.03.2025

A single 3500mAh 18650 cell lasted 3 hours 38 Minutes which is good news. 

Adapting the Foxtrot variant to take 2 thermal cameras, including a microcontroller that also needed additional buttons fur functions. lots of improvements when it comes to making the build water resistant. Sealings on the Hinge, tube, lenses, etc. 

reinforcing the bridge , also adding a backplate for it. 

lots of other small changes and additions