121GW-Open-Firmware
Open replacement firmware for the EEVblog 121GW multimeter in hand-written Thumb-2 assembly, with a full emulator
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GITHUB · launched Nov 1, 2026 · 39 upvotes (top 70%) · 0 views
Niche: embedded systems and firmware utilities · 239 launches, 4 in the last 7 days ▼ -76% · Explore this niche →
Category and tags
- Horizontal
- Hardware & robotics
- Prosumer
- Not AI
- Hobby / open-source project
Visit website ↗ Source listing ↗
More like this: all 239 launches in embedded systems and firmware utilities →
Could you build this?
No Writing replacement firmware for a specific multimeter in hand-written Thumb-2 assembly requires reverse engineering the hardware, its peripherals, and its boot and flash process, and testing on the real device. Vibe coding can help with the emulator but not with the hardware-specific firmware.
What it would actually take: Start by dumping and disassembling the stock firmware, then map the MCU peripherals (ADC, display, GPIO, flash) from the schematics or probing. Write a bootstrap and drivers in ARM assembly, build a cycle-accurate or peripheral-level emulator to test against, and flash through the device's debug or bootloader interface. The hard parts are the undocumented hardware and the calibration and safety of a measurement instrument, which need an embedded engineer with the physical unit.
Competitors
Other products that read as similar to this one : 534 launches clear the similarity bar, closest 8 shown.
Attention rank: #373 of 535 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 361 days after the earliest competitor.
- 121GW-Multimeter-Firmware-RE · github · 2026-11-03 · 43 upvotes · similarity 0.75
- Kelvin · github · 2026-10-19 · 42 upvotes · similarity 0.51
- Model-TG · github · 2026-09-30 · 57 upvotes · similarity 0.50
- PALPack · github · 2026-09-20 · 16 upvotes · similarity 0.50
- esp32-sensors-mqtt-god · github · 2026-09-21 · 9 upvotes · similarity 0.49
- esp32-sensors-mqtt-tft-epaper-elsie · github · 2026-09-21 · 9 upvotes · similarity 0.48
- G1-Emu · github · 2026-09-18 · 30 upvotes · similarity 0.47
- Voltide · github · 2026-10-30 · 64 upvotes · similarity 0.46
The niche, labels, vibe code rating and competitor comparison on this page are analysis by Nicheloom. If you use them, please credit nicheloom.com. How you may use our data.