https://www.crc.id.au/ 2026-07-30T13:05:55+10:00 Steven Haigh https://www.crc.id.au/ Jekyll © 2026 Steven Haigh /assets/img/favicons/favicon.ico /assets/img/favicons/favicon-96x96.png 2026-07-22T12:00:00+10:00 2026-07-22T12:00:00+10:00 https://www.crc.id.au/2026/07/22/custom-dtbo-for-pps-inputs/ Steven Haigh

A while ago, I wrote about using a cheap GPS module as a NTP PPS source, and hot on the heals of Telstra’s NTP issues, I figured I should resurrect my GPS time source. Just because. This used a serial port and the DCD pin to make this work. However, what if you wanted to hook up an embedded board and use the onboard GPIOs instead? Reviewing the GPS module, you’ll see it’s pretty straight forw...

2026-05-07T00:00:00+10:00 2026-05-07T00:00:00+10:00 https://www.crc.id.au/2026/05/07/upgrading-ev-switch-ev-charger-firmware/ Steven Haigh

I have an EV Switch AC7000 EV charger installed at home and it’s integrated into Home Assistant via the OCPP integration. It’s kind of annoying if you want to update the firmware - as the only real option has been to contact their support, they want you to connect back to their OCPP server, wait a random amount of time, they push the update, you reconnect back to your OCPP server, and hopefully...

2025-01-16T00:00:00+11:00 2025-01-16T00:00:00+11:00 https://www.crc.id.au/2025/01/16/remote-update-of-sipeed-nanokvm/ Steven Haigh

The Sipeed NanoKVM is a pretty neat device. Level 1 Techs review: The procedure to update firmware however, is a little obscure. The system has two components: The Firmware - the embedded linux image that boots the device; and The NanoKVM application - which runs the Web UI and does video encoding etc etc. The application itself can be updated within the Web UI, but the firmware itsel...

2024-10-06T00:00:00+10:00 2024-10-06T00:00:00+10:00 https://www.crc.id.au/2024/10/06/secure-dns-with-bind-and-dot/ Steven Haigh

Starting with BIND 9.19, you can now set up DNS over TLS in the forwarders option. You can use this in Fedora now by installing the bind9-next packages instead of bind. Configuring this is quite simple, the example below uses Google, Quad9 and Cloudflare as upstream DNS servers: tls cloudflare-tls { remote-hostname "one.one.one.one"; }; tls quad9-tls { remote-hostname "dns.quad9.net"; }; tls...

2024-09-21T16:57:00+10:00 2024-09-21T16:57:00+10:00 https://www.crc.id.au/2024/09/21/simple-and-cheap-stratum-1-ntp-with-gps/ Steven Haigh

The Linus Tech Tips channel ShortCircuit recently did a video on an NTP time source card. Video here for reference: It’s really nice to have your own clock source, but when you start digging into the price of those units, saying you might not get change from $13,000 isn’t a lie. Of course, that’s for the highest end cards - but do we really need that for a small user? What if you could get m...