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Normally Closed

A 1-post collection

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ESP 8266 Mailbox Notifier using DeepSleep and Blynk

Update July 2020 - if you're interested in creating a mailbox notifier that'll work on regular AA batteries literally for years, take a look at my »

Mike Diamond on ESP8266 - Battery - reed Switch - 18650 - blynk - deepSleep - mailbox - antenna - U.FL to SMA cable - laptop - low-power - ESP8266-07 - notifier - Normally Open - Normally Closed - arduino IDE - BC557 PNP Transistor - IOT 22 June 2016
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