NTP server heated with Bitcoin mining dongles

Bitcoin Mining ASICs Repurposed To Keep NTP Server On Track

They say time is money, but if that’s true, money must also be time. It’s all figurative, of course, but in the case of this NTP server heater powered by Bitcoin mining dongles, money actually does become time.

This is an example of the lengths to which Network Time Protocol aficionados will go in search of slightly better performance from their NTP servers. [Folkert van Heusden], having heard that thermal stability keeps NTP servers happy, used a picnic cooler as an environmental chamber for his  Pi- and GPS-based NTP rig. Heat is added to the chamber thanks to seven Block Erupter ASIC miner dongles, which are turned on by a Python script when a microcontroller sends an MQTT message that the temperature has dropped below the setpoint.

Each dongle produces about 2.5 Watts of heat when it’s working, making them pretty effective heaters. Alas, heat is all they produce at the moment — [Folkert] just has them working on the same hash over and over. He does say that he has plans to let the miners do useful work at some point, not so much for profit but to at least help out the network a bit.

This seems like a bit of a long way around to solve this problem, but since the mining dongles are basically obsolete now — we talked about them way back in 2013 — it has a nice hacky feeling to it that we appreciate.

Portable GPS Time Server Powered By The ESP8266

Most Hackaday readers will be familiar with the idea of a network time server; a magical box nestled away in some distant data center that runs the Network Time Protocol (NTP) and allows us to conveniently synchronize the clocks in our computers and gadgets. Particularly eager clock watchers can actually rig up their own NTP server for their personal use, and if you’re a true time aficionado like [Cristiano Monteiro], you might be interested in the portable GPS-controlled time server he recently put together.

The heart of the build is a NEO-6M GPS module which features a dedicated pulse per second (PPS) pin. The ESP8266 combines the timestamp from the GPS messages and the PPS signal to synchronize itself with the atomic clock aboard the orbiting satellite. To prevent the system from drifting too far out of sync when it doesn’t have a lock on the GPS signal, [Cristiano] is using a DS3231 I2C real-time clock module that features a high accuracy temperature-compensated crystal oscillator (TCXO).

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Apparently Time IS Money

Some people like to tweak cars. Some like to overclock PCs. Then there are the guys like [Jack Zimmermann] who are obsessed with accurate time. He’s working on a project that will deploy NTP (Network Time Protocol) servers in different African countries and needed small, cheap, energy-efficient, and accurate servers. What he wound up with is a very accurate setup for around $200. Along the way, he built some custom hardware, and hacked a computer to sync to the GPS clock reference.

His original attempt was with a Raspberry Pi 3. However, the network adapter isn’t the fastest possible, both because it is 100 MBPS and, primarily, because it is connected via the USB bus. Network latency due to these limitations makes it difficult to serve accurate time.

His solution includes an Odroid C2. For $50 it is a very capable computer with four cores, gigabit Ethernet, and can even use eMMC storage which is faster than the usual SD card. You can still use a conventional SD card, though, if you prefer.

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