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+ | [[File:IButton.jpg|left|thumb|alt=|150x150px]] | ||
{{Tool Infobox | {{Tool Infobox | ||
|Category=Observe | |Category=Observe | ||
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− | + | The Thermocron iButton is a small hardware device that records the temperature every five minutes onto its non-removable memory. No network (Bluetooth, Wifi, etc.) is required. No other device is required until you want to transfer the logs to a computer to read them. | |
== Example CSV output == | == Example CSV output == | ||
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* [https://www.maximintegrated.com/en/design/technical-documents/app-notes/5/5917.html Linux] | * [https://www.maximintegrated.com/en/design/technical-documents/app-notes/5/5917.html Linux] | ||
− | == | + | == circadiaware's description from [https://circadiaware.github.io/VLiDACMel-entrainment-therapy-non24/SleepNon24VLiDACMel.html] == |
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Wrist skin temperature sensor for circadian rhythm phase assessment: Maxim Thermocron iButton [https://www.maximintegrated.com/en/products/ibutton-one-wire/data-loggers/DS1925EVKIT.html DS1925EVKIT] (Starter kit including one [https://www.maximintegrated.com/en/products/ibutton-one-wire/data-loggers/DS1925.html DS1925L iButton] and the DS9490R and DS1402D-DR8+ connectors to retrieve the iButton's data on computers via USB as a CSV file). Cost: about ~$100. If DS1925L is unavailable, can also use DS1922L but the internal memory and battery are much shorter (4 years for DS1925L with 5min sampling rate (setup 300s in the config), 6 months for DS1922L for 2min sampling rate). The iButton does not need to be recharged, but unfortunately once it runs out of battery, it cannot be replaced (although there is [https://www.researchgate.net/publication/270579725_Replacing_the_batteries_on_ibutton_Thermochron_Hygrochron_data_loggers one academic paper which shows how to replace an iButton's battery], but this is not an official instruction, do it at your own risk, and of course the device will be much less airtight after). | Wrist skin temperature sensor for circadian rhythm phase assessment: Maxim Thermocron iButton [https://www.maximintegrated.com/en/products/ibutton-one-wire/data-loggers/DS1925EVKIT.html DS1925EVKIT] (Starter kit including one [https://www.maximintegrated.com/en/products/ibutton-one-wire/data-loggers/DS1925.html DS1925L iButton] and the DS9490R and DS1402D-DR8+ connectors to retrieve the iButton's data on computers via USB as a CSV file). Cost: about ~$100. If DS1925L is unavailable, can also use DS1922L but the internal memory and battery are much shorter (4 years for DS1925L with 5min sampling rate (setup 300s in the config), 6 months for DS1922L for 2min sampling rate). The iButton does not need to be recharged, but unfortunately once it runs out of battery, it cannot be replaced (although there is [https://www.researchgate.net/publication/270579725_Replacing_the_batteries_on_ibutton_Thermochron_Hygrochron_data_loggers one academic paper which shows how to replace an iButton's battery], but this is not an official instruction, do it at your own risk, and of course the device will be much less airtight after). | ||
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** This setup provides true 24/7 skin temperature monitoring setup, as the iButton DS1925L can last 4 years with its integrated battery (then need to buy another one or can try to manually [https://www.researchgate.net/profile/Sean_Haughian/publication/270579725_Replacing_the_batteries_on_ibutton_Thermochron_Hygrochron_data_loggers/links/54aeabbf0cf29661a3d3a42e/Replacing-the-batteries-on-ibutton-Thermochron-Hygrochron-data-loggers.pdf replace the battery] as some researchers have done). | ** This setup provides true 24/7 skin temperature monitoring setup, as the iButton DS1925L can last 4 years with its integrated battery (then need to buy another one or can try to manually [https://www.researchgate.net/profile/Sean_Haughian/publication/270579725_Replacing_the_batteries_on_ibutton_Thermochron_Hygrochron_data_loggers/links/54aeabbf0cf29661a3d3a42e/Replacing-the-batteries-on-ibutton-Thermochron-Hygrochron-data-loggers.pdf replace the battery] as some researchers have done). | ||
** Data need to be transferred to a computer every 6 months (for the DS1925L, the interval is much smaller with DS1922L, about 10 days), and the device memory (mission) needs to be reset, otherwise it will stop recording new records. | ** Data need to be transferred to a computer every 6 months (for the DS1925L, the interval is much smaller with DS1922L, about 10 days), and the device memory (mission) needs to be reset, otherwise it will stop recording new records. | ||
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