Show HN: PaperMono, e-ink fridge magnet shopping list with mobile web page

Fridge magnet shopping list on an M5Stack PaperMono (ESP32-S3, e-ink
touchscreen), synced with a phone web app over Wi-Fi. Works offline,
~2,400 lines of C++.

This is a great wee device! BLE, Wi-Fi and LoRa on one board makes it flexible
for way more than a shopping list, this is just what I built first. This
firmware only uses Wi-Fi.

Fully vibe-coded with Claude Code, I didn't hand-write this. I wanted to see
how Claude would get on with building something useful for a new hardware device.

As it's stuck to the fridge it's easy for the family to use, and it's already being used day to day which I'll admit is a first for a home built project like this




Comments URL: https://news.ycombinator.com/item?id=49875801


Points: 16


# Comments: 4

guid

https://news.ycombinator.com/item?id=49875801

source_url

https://github.com/seamusc/papermono-shopping-list

author_name

seamus_c

id: 7158
uid: DIs6k
insdate: 2026-09-28 14:05:24
title: Show HN: PaperMono, e-ink fridge magnet shopping list with mobile web page
additional:

Fridge magnet shopping list on an M5Stack PaperMono (ESP32-S3, e-ink
touchscreen), synced with a phone web app over Wi-Fi. Works offline,
~2,400 lines of C++.

This is a great wee device! BLE, Wi-Fi and LoRa on one board makes it flexible
for way more than a shopping list, this is just what I built first. This
firmware only uses Wi-Fi.

Fully vibe-coded with Claude Code, I didn't hand-write this. I wanted to see
how Claude would get on with building something useful for a new hardware device.

As it's stuck to the fridge it's easy for the family to use, and it's already being used day to day which I'll admit is a first for a home built project like this




Comments URL: https://news.ycombinator.com/item?id=49875801


Points: 16


# Comments: 4


category: Hacker News
md5:
guid: https://news.ycombinator.com/item?id=49875801
source_url: https://github.com/seamusc/papermono-shopping-list
updated:
image:
author_name: seamus_c
author_link:
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