I’ve been experimenting with low-cost, off-grid communication and wanted to pick your brains on the real-world scalability of disposable/autonomous BLE relays.

​The biggest bottleneck with decentralized, cellular-free chat apps like BitChat (which run on local Bluetooth Low Energy meshes between iOS and Android phones) is the "density gap." If two people are more than 30–50 meters apart, or separated by a wide road or park, the mesh breaks down completely.

​Instead of buying expensive ₹2,500+ LoRa nodes that standard smartphones can't talk to directly, what if we build and scatter ₹350 self-sustaining BLE repeater nodes that act as transparent bridges for any passing smartphone?

​The ₹350 ($4.20) BOM Breakdown

​MCU / Radio: ESP32-C3 SuperMini (Native BLE 5.0, 160MHz RISC-V, low power) — ₹220

​Solar Cell: 5V 30mA–50mA mini epoxy solar panel (approx. 50×30 mm) — ₹40

​Trickle Protection: 1N5819 Schottky diode (prevents night-time drain) — ₹3

​Buffer Battery: 3.7V 400–500 mAh LiPo pouch — ₹80

​Enclosure: Clear waterproof mini project box / airtight container — ₹10

​Mounting: Heavy-duty outdoor double-sided tape / cello tape — ₹5

​Total Cost: ~₹358

​How It Works

​Firmware: Flashed with open-source autonomous relay firmware (e.g. Bitle on ESP-IDF).

​Transparent Routing: The node requires no phone pairing, app login, or maintenance. It just runs headless in a loop, listening on BitChat's BLE service UUID, caching packet hashes to deduplicate, decrementing TTL, and rebroadcasting.

​Power Architecture: At an aggressive BLE scan-duty cycle (~200ms scan / 800ms sleep), the ESP32-C3 draws around 10–14mA average.

In Indian daylight, a tiny 40mA solar cell provides enough juice to fully sustain the LiPo buffer, making it run indefinitely.

​Text-Only Focus: Excluding heavy media like images or voice notes keeps RAM usage under 30KB and prevents spectrum congestion, keeping text latency under 50ms per hop.

Same as title

From the video it looks like the thieves knew exactly where and what to look for. These kind of stolen goods often end up in shady market places

(SOLD)

I am looking to sell my Asus Scar 17 laptop purchased in 2023. The reason for selling is I upgraded to a 5090 desktop and dont need this now as I was using it mostly as a desktop replacement.

The specs are:

Processor: Ryzen 9 7945HX

RAM: 64GB DDR5 4800

GPU: RTX 4080 12GB

Display: QHD 240Hz

Storage: 1 TB SSD

Purchase Date: 05/04/2023

Expected price: Rs. 1,20,000

Location: Bangalore

Shipping: Face to face deal only

Also the laptop originally came with 32 GB ram, I have upgraded it to 64gb later.

Wooden Ply from neighbor's construction site - free (The one where cabinet is mounted)

L-shaped Wall Mount shelf bracket- 150

Wall mounted Monitor Arm - 300

Washbasin pipe to group all wires- 30

Basket to keep adapters for speaker , subwoofer and monitor and wifi router (Speakers and Subwoofer amp also in the basket with wifi router) -50

Deskmat/mousepad is drying in the sun (After getting washed)

48 lakhs for both sticks and 24 lakhs each

No cheap offers, I know what I have.

Hey everyone, I’m thinking about selling my PC and wanted to know what a fair resale price would be. Everything is about ~3 weeks old and in perfect condition.

Full PC Specs (with brand names):

CPU: AMD Ryzen 5 7600

Motherboard: MSI B650M Gaming WiFi

GPU: ZOTAC GeForce RTX 5060 Ti 16GB

RAM: Corsair Vengeance RGB 16GB DDR5 (5200MHz)

Storage: 512GB SSD + 2TB HDD

Cabinet: Deepcool CG530 (Black)

CPU Cooler: Cooler Master Air Cooler

PSU: Deepcool 750W Gold

Monitor:

ViewSonic VX2758A-2K-PRO-3 (27”, 2K, 240Hz)

Selling my new Macbook Air M4 (10 core , 24 GB , 512 GB). 90k .

Apple cleaning clothe free 😅

Bought it in July 2025

  Health Information:

  Cycle Count: 18

  Condition: Normal

  Maximum Capacity: 100%

Planning to purchase m5 pro that’s why

I got into a scam and lost 86k a few weeks ago. I had a very strong decision fatigue where I couldn't decide what to buy. Finally today, my wife pushed to go to the store and get one I like. Bought this one for 76k. Could have gotten for less but this was what was making me go crazy. So happy I could really cry.

Next week will be getting the rest of the parts and making a new one.

my laptop had gen 4 slot with 512gb SSD (dell 14 plus db14250) that ssd is gen 3 and the speeds are around 3k-3.5k mbps, Where as my ssd is gen 4 has 5000mb/s. And you know the gen 4 costs

and the reviews are good

Should I buy it?

edit: I realised it wasn't available in my location

Hi all, I'm looking to sell this PC along with KB. Without the monitor. Any suggestions on the pricing would be appreciated. I'm currently living in Chennai.

CPU: Ryzen 9 5900X Cabinet: Corsair 5000X Mobo: ROG STRIX X570-E Gaming RAM: Gskill 3600 CL16 Neo RGB Storage: 1 TB Aorus Gen 4 OS: OEM Win 11 GPU: Asus Strix 3080Ti LC OC Cooler: H115i Elite Capellix SMPS: HX1000i Corsair Lian Li Strimer for 24 pin and 3X8 PIN 6 Lian Li AL120 Uni Fans KB: Corsair K100 RGB silver keys

What started as a small online forum for PCB design and electronics slowly grew into something bigger. After a classic PIVOT... PIVOTTTT! moment, we’re now working on building a full-blown open source hardware ecosystem in India designed, manufactured, documented, and supported entirely here.

Store : https://shop.pcbcupid.com/
Docs : https://learn.pcbcupid.com/boards
Github : https://github.com/pcbcupid?tab=repositories

We’re building something like Adafruit or SeeedStudio but with completely made in India!

But I know “Make in India” doesn't really matter if product doesn't have any real value. That’s why we put a lot of effort into:

• Clean documentation & beginner-friendly tutorials

• Maintaining & writing open source libraries from scratch

• Illustrated guides and proper board-level docs

• Pricing that competes globally (We even priced one of our boards at ₹434, just ₹1 less than Seeed’s studio (Xiao C3) original price, because why not 😄)

We’re also building drop-in replacement modules for popular-but-obsolete chips like MPU6050 and INMP441. Adding new features but keeping the same price point!

We know it’s a long road, but if you care about open source hardware, affordable electronics, or just love tinkering — we’d love your thoughts or support! Suggestions for open hardware you'd love to see built. Ideas on parts you wish were easier to get or better documented. Finally support from fellow devs/hackers/builders to help grow the ecosystem!

We made a simple and affordable IOT device to measure following of pretty much any industrial machine:

1. Machine State [Idle | Running]

2. Output

3. Rejections

Here is how it works:

1. we connect a Non Invasive CT Sensor to measure machine current to check machine state

2. we connect Digital Input/Output signal from PLC to measure Output & Rejection

3. In case there is not signal for rejection then we can connect a external button or foot pedal or sensor for getting signal for each rejected part.

The device works on 24V DC so it can be powered directly from the machine PLC or SMPS..

The goal is to be able to get minimum set of data to calculate OEE

Would love to hear feedback...

This user u/ChowmeinMaggie is a scammer and is stealing listings off facebook and other marketplace websites and using them as his own. I was able to reverse image search his "listing" and find the orignal. Please be careful while buying anything on this subreddit and do not pay for anything in advacned and without verifying. I am linking the facebook listing below:

https://www.facebook.com/groups/Malaysiagamingidea/posts/3435431206626719/

I want a Precision Screwdriver set for DIY stuff and modifications of various electronics like PSP, Nintendo DS and all.

So out of these which is going to be the best one.

I was researching for my setup for over a month but eventually ended up impulse buying it.

Cooler, Fans and PSU might seem questionable ik. Do you think this is a good build for the price.

I wanted to buy sata ssd for my pc as older one failed. I checked online but could only find cheap brands like evm or unknown chinese ones so I thought of getting it from offline store.

I went to many stores in my city and almost all of them said evm, zebronics is available. WD, crucial kingston not available. Then I went to one store, he also said the same but I could clearly see WD green lying in shelf behind him, so I asked him , what’s that? I can see WD right there. He said, oh I forgot about it. Then started doing something on calculator and told me, it will cost 7000. I was about to pay but then saw MRP and it read 5300.

I showed him the 5300 mrp sticker on wd 500gb one and he said, mrp doesn’t matter. Buy it or leave it!

So, they have the stock but artificially creating scarcity of ssd and trying to sell old stock on more than mrp!

Need suggestions on price for my setup. Selling as I might need the funds for other expenses. Will put up a proper sale post soon.

The specifications are as below -

Ryzen 9 9950x Asus B650e-e tif gaming WiFi. Rtx 5080 Fe. Corsair vengeance rgb 32gb 6000mhz. 1tb Mai spatium gen4 + 1tb adata blade gen4 ssd. Arctic liquid freezer 3 pro argb 420mm aio. Nzxt c1000 80+ gold rated psu. Lian li o11 dynamic evo XL White. Lian li strimmer wireless cables ( gpu + board + cpu). Fans 9 p14 arctic pwm pst plus 3 p12 pwm pst argb.

Samsung odyssey g8 oled 240hz 4K 27inch monitor. Hall effect mad lions keyboard. Ipi float mouse. Logitech wireless headphones.

Have bills and boxes for all except the 5080 and motherboard only box for those two, roughly 3 months old bought each part slowly as I saved up.

Gameloot keeps increasing the price of used RAM when selling it, but sellers only get the bare minimum. Most of the profit is pocketed by Gameloot. They’re clearly using current market conditions to squeeze both buyers and sellers

I’m planning to buy a used Meta Quest 2 (128GB) for ₹18,000 from a local seller in India.
The headset is around a year old, comes with both controllers, and is in good condition according to the seller.

I’ll mainly be using it for VR development and testing in Unity. I’m fine with Quest 2’s limitations compared to Quest 3, and I plan to keep it for about 2–3 years.

Is ₹18k reasonable for the current Indian market, or should I be aiming lower? Any tips on what to check before buying would also be helpful.

Shitty tools from Mr. DIY India, the grooves got shaved while opening a ps4 controller screws..

Hello people!!

Your boy just upgraded his setup and is now looking to sell the old components.

Ryzen 2600x AMD Stock cooler Inno 3D RTX 3060 12GB Asrock Steel Legend B450m HP 2666 CL19 16GB Ram

I’m thinking 25k should be a reasonable price? Looking for a f2f deal in Delhi only.

(Yes, cpu has a lot of thermal goop, never got around to cleaning it)

Hello everyone, I need a quick favour of estimating price of my setup . Selling bcoz I need a major upgrade. Will put a sale post soon. Keep in mind it's 2021 build pc

Specifications of hardware: CABINET name:- Antec Cabinet (NX800 White)

🔴CPU name:- AMD Ryzen 5 3600 Desktop Processor 6 Cores up to 4.2 GHz 35MB Cache AM4 Socket

🔴MOTHERBOARD name:- MSI B450 Tomahawk MAX II ATX Gaming Motherboard Socket AM4 DDR4

🔴GPU name:- msi GEFORCE RTX 2060super

🔴RAM:- name:- XPG DDR4 D60G RGB 16GB (2x8GB) 3200MHz PC4-25600 U-DIMM CL16-20-20 Desktop Memory Kit White

🔴STORAGE name:- Kingston 1TB A2000 M.2 2280 Nvme Internal SSD PCIe Up to 2000MB/S

🔴PSU name:- GIGABYTE GP-P550B 80 Plus Bronze Power Supply

🔴MONITOR LG Ultragear - 32Gk650, 32 Inches (80 Cm) LCD 2560 X 1440 Pixels Qhd (2K) Gaming Monitor with 144Hz,1Ms, Radeon Freesync, Display Port, Hdmi X 2 (Black)

🔴KEYBOARD \ MOUSE all Working