# Chatter 2.0 (CircuitMess)

> A kit for building a pair of off-grid text messengers.

- **Category:** DIY & play
- **Availability:** Listed by maker
- **Price:** US$149 pair, checked 2026-09-15
- **Good for:** Build a pair of direct LoRa text messengers.
- **You'll need:** Kit assembly and 3 × AA batteries per device.
- **Trade-off:** Check the board revision before using earlier Chatter or Meshtastic firmware.
- **Page:** https://gadgets.sh/devices/chatter-2-0/

## Where to buy

| Shop | Status | Link |
|---|---|---|
| CircuitMess | Orderable | https://circuitmess.com/products/chatter-2-0?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=chatter-2-0&utm_content=api |
| Amazon | Orderable | https://www.amazon.com/dp/B0FMKJL6CY?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=chatter-2-0&utm_content=api |
| STEMfinity | Orderable | https://stemfinity.com/products/circuitmess-chatter-2-0?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=chatter-2-0&utm_content=api |

## Blueprint

**Schematics published.** Schematic PDF and closed-source-looking firmware repo (no license file) are published; no editable PCB source found.

### Design files

- schematic: [Chatter 2.0 schematic (PDF)](https://cdn.shopify.com/s/files/1/0552/3269/2430/files/Chatter_2.0_schema.pdf) (PDF)
- manual: [Chatter 2.0 build booklet (PDF)](https://cdn.shopify.com/s/files/1/0552/3269/2430/files/Chatter_2.0_booklet_2025_PRINT.pdf) (PDF)

### Source repositories

- [CircuitMess/Chatter2-Firmware](https://github.com/CircuitMess/Chatter2-Firmware) — firmware, ★18

### Key parts

| Part | Role | Datasheet |
|---|---|---|
| LoRa/Wi-Fi module marked "VGdd79S868N0S1" | radio |  |

_Notes:_ Schematic PDF verified 200. CircuitMess/Chatter2-Firmware repo exists (18 stars) but gh api reports no license field. No KiCad/Gerber files found in the repo. LoRa/Wi-Fi module marked "VGdd79S868N0S1": per drawing; exact part not otherwise identified

## Specifications

### Build and package

| | |
|---|---|
| Project | Pair of DIY LoRa text communicators; no Wi-Fi or cellular network needed |
| Build estimate | About 2 hours for both devices; beginner-friendly, ages 9+ |
| Included | Boards, acrylic cases, battery holders/covers, switch caps, button caps and bolts |
| Assembly tool | Screwdriver included in the 2025 booklet’s package list |

### Hardware in the linked v2.1 drawing

| | |
|---|---|
| Controller | WT32-S1 module |
| Display | Drawing labels a 1.77-inch TFT with a 14-pin connection |
| Power | 3 × 1.5 V AA cells per device; six for the pair |
| USB | USB-C with CH340C serial interface |
| Radio | Module marked VGdd79S868N0S1 with a PCB antenna |
| Battery reading | Drawing notes battery voltage cannot be read while USB is connected |
| Buzzer connection | GPIO22 in the linked v2.1 drawing |

### Use and programming

| | |
|---|---|
| First connection | Use the Friends app to discover another Chatter and exchange friend requests |
| Range claim | Maker estimates roughly 2 km under optimal conditions; obstacles and surroundings affect range |
| Coding | CircuitBlocks; booklet also lists Python and Arduino C++ |
| Custom projects | Screen text/graphics and buzzer programs |
| Encryption | Advertised by the maker; cipher, key handling and security evaluation remain unspecified |

### Revision check

| | |
|---|---|
| Earlier library pin map | Chatter2-Library assigns buzzer GPIO19; compatibility with the current board needs checking |

## Documentation

- [Chatter 2.0 product](https://circuitmess.com/products/chatter-2-0)
- [Exact 2.0 guide and downloads](https://circuitmess.com/blogs/resources/chatter-2-0-build-guide)
- [Chatter 2.0 creator booklet PDF](https://cdn.shopify.com/s/files/1/0552/3269/2430/files/Chatter_2.0_booklet_2025_PRINT.pdf)
- [Chatter 2.0 schematic PDF, internal v2.1](https://cdn.shopify.com/s/files/1/0552/3269/2430/files/Chatter_2.0_schema.pdf)
- [CircuitBlocks online editor — sign-in required](https://code.circuitmess.com/)
- [Older Chatter2 library pin map](https://raw.githubusercontent.com/CircuitMess/Chatter2-Library/master/src/Pins.hpp)
- [Older Chatter2 firmware source; match revision first](https://github.com/CircuitMess/Chatter2-Firmware)
- [Meshtastic documentation for earlier Chatter boards](https://meshtastic.org/docs/hardware/devices/community-supported/chatter/)

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Source: gadgets.sh · https://gadgets.sh/devices/chatter-2-0/ · JSON: https://gadgets.sh/api/v1/devices/chatter-2-0.json