Meshtastic HeltecV3 Hel-Txt 18650 "RUGGED"
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Meshtastic Stand alone device remix based of Harukis "Hel-Txt" messenger.
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UPFRONT!
I created a Discord channel for my Thermal vision builds but will add a #meshtastic channel there as well in case you have questions or problems. Please remain to the meshtastic channel for all sort of questions as all the other channels are ONLY for my thermal builds!
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My try on Harukis design to transform the “consumer version” of his Hel-TXT meshtastic device into a little tank.
First thing I did was making the reset button a lot smaller as I kept pressing it accidentally. (maybe I am clumsy, but I dont see a good reason why the reset button would need to be the same size as the program button)
As I used the original design mostly outside, sunlight could cause some problems at time making it hard to read the heltecs display, that for I implemented a little sunshield above the screen, works great in direct sunlight.
GPS antenna was changed from Haruki original design to that was mounted on the outer edge of the frame, works fine but I wanted to utilize the same arrangement like on my other design I made recently. Having the GPS antenna positioned in a 45 degree angle it always points towards the sky no matter if the device is laying on its back or standing upright.
4000mAH lipo battery surely works great but I did not want to wait for the order to arrive and remixed the frame to take 2 x 18650 cells, my personal unit now features a pack of two cells with whopping 7000mAh.
Made a slot for the buzzer right underneath the mounting option on the top frame so sound can be heard unobstructed no matter if you use the TPU frame or not. Simply slot the buzzer in with the solder points exposed to the back.
The GPS mainboard also simply gets glued against the backside with some double sided tape. ( I am using nija tape as its sticks really well and stays flexible)
7000mAH is a big capacity and the heltecs onboard charging would take forever to charge the cells all the way, that for I implemented its own quick charging circuit that delivers 15Watts@5volts, which means 5 times faster charging then with the heltecs charging circuit.
On top I added 3 mounting options for ropes, carabiners, you name it, also acting as a antenna base protector (antennas with a max base diameter of 11mm are possible)
Using a peice of translucent filament as optical fiber the breathing ( status) light is well visible from all sides.
The whole build sits in a TPU printed frame that can take quite the beating, covering the on/off switch as well the heltecs USB C connector as those are not needed in every day use.
Not only does the TPU cover looks nice it also feels nice and rubbery when hand hold.
I guess that's it, gonna add a lot more pictures of the inside and how to connect GPS and make it work with a mosfet so you can switch it on/off by software ( The transistor you see on the official docu never worked for me in over 6 devices I tried, but then found a working solution with a mosfet that works reliable)
Things your going to need for this build:
PCB Keyboard:
Eingabegeräte CardKB Mini Keyboard Programmable Unit V1.1(MEGA8A) : Amazon.de: Computer & Zubehör
GPS module:
3 volt buzzer 8.5x8.5x3mm
Heltec V3 Lora dev board:
RGB LED: ( decide for either RED, BLUE or GREEN and use the responsible leads)
Power switch:
The 18650 Cells are also not protected so your going to need a BMS for each cell!
Battery management System:
I am aware that the Heltec V3 does include a BMS but the connected GPS will still draw power from the Heltec regardless of the BMS, this would kill your battery if the device is not switched off, that for an additional BMS connected to the battery directly will prevent this!
GPS Power switch Software based:
If you want to be able to switch GPS off and on, on demand by setting up a GPS_enable GPIO pin in the app and by pressing the button 3 times your going to need a Mosfet for that ( of course this is totally optional but helps a lot with saving power!!): SI2312
Check pictures how you need to solder the mosfet on the heltec board, connect the ground from the GPS mainboard to the middle mosfet pin.
Quickcharge Addon charging board:
In addition you will need some double sided tape for the GPS PCB, solder iron and related equipment and thin wire and of course the knowledge to do that kind of work.
Print top cover and quick charge cover in the orientation shown in the preview with support up from the print bed.
Print back cover in the orientation shown in the preview with supports everywhere.
Print tpu frame in the orientation shown in the preview with supports everywhere
Print LED head in translucent color in FDM or Resin. LED also needs to b filed down to make it fit into the LED head.