May 21 2017
Most electronic projects operate on low voltage direct current. This is often provided by a USB connection or a battery. There are several possibilities to power a project from the 120 Vac power line. A common way is to use a wall adapter (wall wart) and feed low voltage direct current to your project through …
Permanent link to this article: https://w4krl.com/power-supply-measurements/
Dec 11 2016
The key to using solar power in an Internet of Things project is to put the microcontroller unit into sleep modeafter the sensors are read and the data posted to your IoT server. The NodeMCU and the Wemos D1 WiFi, a larger profile that mimics the Arduino UNO form, reliably woke from deep sleep. So …
Permanent link to this article: https://w4krl.com/sleep-mode-for-the-wemos-d1-mini/
Nov 24 2016
A solar power supply would be a really neat addition to any Internet of Things project. The ultimate goal would be to have a self-sufficient IoT device that could be remotely reprogrammed with the Over The Air (OTA) feature. A key to using solar power is to reduce the average power requirement of the IoT device. …
Permanent link to this article: https://w4krl.com/solar-power-supply/