Circuit Digest

How to Build an Automatic Toll Gate System Using Arduino

An automatic toll gate system using Arduino revolutionises traditional toll collection by eliminating manual intervention.
GitHub

Control a relay with an ESP8266 - purpose built module

So you want to control some mains electrical (or lower voltage) item using your phone, perhaps? This single ESP8266 plug-in controls a relay that is built in to the module. An Android app (.apk) ...
GitHub

Controlling relays with NodeMCU V1.0 (ESP8266-12E). Contains fritzing layout and Arduino IDE Code.

This PCB was planed for Sainsmart 4-Channel 5V Relay Module. It is alss possible to measure the current if ACS712 is connected to the prepared header. ACS Generic male header - 3 pins pin spacing ...
IEEE

11.5 A 3.2×1.5×0.8mm3 240nA 1.25-to-5.5V 32kHz-DTCXO RTC module with an overall accuracy of µ1ppm and an all-digital 0.1ppm compensation-resolution scheme at 1Hz

Abstract: Timekeeping based on a 32kHz XTAL still remains the most popular, cost effective, low power, accurate solution for low-power portable applications. Simple solutions with overall accuracies ...