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Thomas Gohle
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This is my “Hello World” hardware project on the new ToGo-Lab server. Years ago I built a tiny Morse throwie: ATtiny + one LED + one resistor, plus firmware. This version adds a supercapacitor and small solar cells. It uses the LED as a light detector, so it only blinks in the dark.
It’s not a throwie anymore. Hang it anywhere with decent light (for charging) and dry conditions and let it blink Morse on its own during night.
It's not a throwie anymore. Hang it anywhere with decent light (for charging) and dry conditions and let it blink Morse on its own during night.
Goal: a beginner-friendly DIY kit with clear docs and hackable firmware.
Checkout also the [blog about this project](https://togo-lab.io/)
Checkout also the [blog about this project](https://https://togo-lab.io/?p=82)
Suggestions welcome. Open an issue or email [tgohle@togo-lab.io](mailto:tgohle@togo-lab.io).
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0001_FireFly/
├─ KiCad/ # .kicad_pro, schematic, PCB, fabrication outputs
├─ CAD/ # 2D/3D mechanical drawings, panel outlines (if any)
├─ Programm/ # firmware source, hex, Makefiles / Arduino sketches
├─ Program/ # firmware source, hex, Makefiles / Arduino sketches
└─ Documentation/ # assembly guide, quick start, FAQ, photos, BOM CSV
```
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## Hardware
- **MCU**: ATtiny45/85 (internal RC clock, no crystal).
- **I/O**: 1× LED + series resistor. Unused pins broken out to breadboard-style pads.
- **Programming**: external ISP programmer via Arduino IDE; PDIP-8 ATtiny45/85 footprint.
- **Burning Attiny**: external ISP programmer via Arduino IDE; PDIP-8 ATtiny45/85 footprint.
- **Power**: 3V DC (coin cell & & solar cell + supercapacitor with Schottky diodes to extend battery power).
- **Safety**: low voltage only. Observe polarity.
- **PCB**: hackable; access to unused ATtiny pins.
> PCB notes: big pads for beginners, clear silks, LED polarity marks, ISP near board edge for pogo-clip.
- **PCB**: hackable; access to unused ATtiny pins. (big pads for beginners, clear silks, LED polarity marks)
---
## KiCad
- **Version**: 7.x or newer recommended.
- Open `0001_FireFly/KiCad/ToGo-Lab_FireFly.kicad_pro`.
- Run ERC/DRC and fix errors before fabrication.
- Plot: Gerbers + drill. Add a README in `KiCad/fab/` with board thickness, finish, mask color, and min track/space.
- Optional: panel outline DXF/SVG in `CAD/`.
---
## Firmware
Two paths. Use what you like.
### A) Arduino IDE
## Firmware / Arduino IDE
- Follow `Documentation/ToGo-Lab_FireFly_ArduinoIDE_Program_Guide.md`.
- Board core: any stable ATtiny45/85 core.
- Clock: **internal**. No fuse change required for first tests.
- Programmer: USBasp / AVRISPmkII / Arduino-as-ISP.
- Open the sketch in `0001_FireFly/Programm/arduino/`.
- Set message and WPM in `config.h`. Build and **Upload Using Programmer**.
> Timing: internal RC. Unit may run at 1 MHz (CKDIV8) by default—adjust `F_CPU` or disable CKDIV8.
### B) avr-gcc + make
- Toolchain: `avr-gcc`, `avr-libc`, `avrdude`.
- `cd 0001_FireFly/Programm/avr/` then `make all` → `firefly.hex`.
- Flash: `make flash` (edit `PROGRAMMER` and `PORT` in the Makefile).
- `config.h` holds CPU clock, WPM, brightness.
- Open the sketch in `0001_FireFly/Program/`.
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2. Power at 3–5 V. Current < 10 mA idle.
3. Program firmware over ISP.
4. Verify Morse timing; adjust WPM in `config.h` if needed.
5. Optional: measure sleep current.
5. Optional: measure current.
---
## BOM
- `Documentation/ToGo-Lab_FireFly_BOM.csv` is the source of truth.
- Columns: `Designator,Qty,Manufacturer,MPN,Alt1,Description,Notes`.
- Keep alternates for LED and MCU. Note lot/date codes in commit messages for production.
- Follow `Documentation/ToGo-Lab_FireFly_BOM.csv` as source of truth.
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---
## Contributing
PRs and issues welcome. Keep it simple. Reproducible steps beat long essays.
Photos of your build go in `Documentation/gallery/` with a short caption and license notice.
PRs and issues welcome. Keep it simple.
Photos of your build you send me go in `Documentation/gallery/` with a short caption and license notice.