Nodemcu smart timer4/13/2023 You'll need a DHT11 temperature and humidity sensor. You'll need a DS1307 or similar Real-time Clock. You'll need an ESP32 based development board such as a NodeMCU ESP32s or DOIT devkit 01. I recently bought 5 of these for $5 each. They usually ship on development boards that contain a USB bridge for programming or serial access and can also be used to power the board in lieu of another 3.3vdc source. The chips contain a hall effect sensor that can detect magnetic fields, several touch capacitive pins, I/O pin muxing, and more. In addition to WiFi b/g/n, they support Bluetooth, including BLE, as well as ESP-NOW - a built in proprietary radio communication protocol. They also feature advanced "deep sleep" capabilities aided by a tiny coprocessor that can wake up the CPU on a number of configurable events and can operate at a max frequency of 240Mhz. The stock ESP32 chips are 3.3vdc SoCs that ship with 4MB of flash, with custom order chips supporting as much as 16MB. This time, there's no hijacking required, as the ESP32 was designed from the start not as a WiFi module but as a first class IoT board, with WiFi capabilities. Remember the WiFi module whose CPU we hijacked in the prior project in order to run a web server on it? That one. The Espressif ESP32 is the successor to the ESP8266. Like the parts they replace, these new parts are inexpensive and readily available at online electronics retailers. Specifically, we'll be using an ESP32 on a development board rather than an Arduino Mega 2560 WiFi and we'll be using a fresh 128x32 pixel monochrome OLED display instead of the old liquid crystal display. In this article, we revisit the IoT Smart Clock using newer hardware.
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