A Pi-hole-class DNS ad-blocker on an ESP32-C3 (no PSRAM)

T1Covered by 1 source · first reported by Raspberry Pi / Arduino / Adafruit at 07 Oct, 19:18 UTC

Zed (@M-Abozaid) published a DNS ad-blocker on GitHub that runs on a $2 ESP32-C3 with no PSRAM. Most ESP32 DNS sinkholes load blocklist domain strings into RAM, which is why they need PSRAM. This one stores each domain as a sorted 40-bit FNV-1a hash in flash and binary-searches it. Over 140,000…