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a private ESP32 intercom for five kids, no accounts

Details

External ID
49205627
Source
HN
Company
—
Product
Sidebar
Website domain
sundaradnus.ca
Launched
Aug. 7, 2026
Cohort
—
Upvotes
16
Upvotes percentile
0.7116935483870968
Tags
—
Fetched at
Sept. 10, 2026, 5:32 a.m.
Updated at
Sept. 10, 2026, 5:32 a.m.

Description

Hello all - Inspired by many who build/assemble for their daughters/sons, I took cue and assembled a two-way communication between my son and his friends. Nothing spectacular. Just basic stuff to talk.He is eleven and doesn't have a phone. I wanted him to talk to his friends without an account, a feed, or an algorithm in between, so I built five ESP32-S3 touchscreen units, one per kid. Tap a friend's name, their unit rings. Tap Everyone, they all ring.Each unit dials outbound to a relay I run, so no house opens a port. Audio is uncompressed 16 kHz PCM in 20 ms frames, AES-256-GCM with a fresh key per call, over UDP with an encrypted-WebSocket fallback. To be precise: encrypted to my relay, not end-to-end. No rooms, no recordings, no free-text contacts; the roster lives in a server-side allow-list.I'm a PM, engineer by degree but not by profession - let alone a firmware engineer. I assembled this with Claude as the engineering partner, which is why the write-up includes what went wrong: I shipped an OTA that boot-looped my son's board, and separately "diagnosed" a Cloudflare outage that didn't exist because I tested from the wrong vantage point. Echo is still unsolved.The enclosure was designed in FreeCAD by my son (11); the STLs are in the repo.It was a fun and exhilarating work for me and my son - like most of you would have experienced.Looking forward for your responses/feedback.

Enrichment

Theme
interactive simulations and creative experiments
Vertical
Horizontal
Function
Hardware & robotics
Audience
B2C
AI stance
Not AI
Project type
Hobby / open-source project
Normalized one-liner
private esp32 intercom for families
Manually corrected
False

Could you build this?

No This project requires custom hardware design, ESP32 microcontroller firmware, audio codec integration (I2S DAC/ADC), and raw wireless networking without public infrastructure.

What it would actually take: Requires physical hardware assembly (ESP32-S3 boards, I2S microphones like INMP441, audio amplifiers like MAX98357A, speakers, batteries, and 3D printed enclosures). Software requires ESP-IDF or Arduino C++ using ESP-NOW or raw UDP multicast over local Wi-Fi, low-latency audio buffering, Opus audio encoding/decoding, and power management. Requires embedded hardware prototyping and firmware debugging skills.

Discussion

13 comments analyzed.

Competitors mentioned: Opus codec, Tor network, Commercial subscription walkie-talkie services, Toy company mass-produced devices

Concerns raised: Static/voice effects may confuse kids unfamiliar with ham radio, Voicemail model may interfere with ham-like authenticity, TCP/Tor latency issues, Not commercially scalable due to financial and time constraints, Pricing around $250 Canadian for 6 units may limit adoption

Feature requests: In-call text chat capability, PTT (Push-to-Talk) chime, Voice effects like static for authentic ham transmission feel, Voicemail message saving feature, Reduced latency for real-time communication

Competitors

Other products that read as similar to this one — 116 launches clear the similarity bar, closest 8 shown.

Attention rank: #40 of 117 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).

Launched 281 days after the earliest competitor.

Other launches for this product

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