This Arduino motion-activated alarm features a tilt sensor for detecting movements and a piezo speaker for producing the siren sound. Introduction Basically, the tilt sensor produces a high voltage when it is tilted and a low voltage when it is placed flat on a surface. The siren is produced by …

The BMP085 is a relatively cheap barometric pressure sensor from Bosch. I believe this sensor is kinda old (no information about this device is found on the Bosch site) and yet it’s still used today because of its simplicity. This Arduino BMP085 tutorial covers the basics of using this device …

This is a handy Arduino programming guide for those who already have some experience with Arduino but sometimes forget about the basics.

Test command Command Response Parameter AT OK -   Reset Command Response Parameter AT+RST OK -   Get firmware version Command Response Parameter AT+GMR VERSION:<Param> OK Param : firmware version   WiFi mode Command Response Parameter AT+CWMODE=? +CWMODE:(1-3) OK - AT+CWMODE? +CWMODE: <Param> OK Param: 1 -- station mode (client) …

The HC-05 is a common Bluetooth module used in many microcontroller projects. Here's a compilation of all HC-05 Bluetooth AT Commands. For beginners, see Arduino Bluetooth.

A reference of Arduino Parts for building your own Arduino board.

There is, in fact, a way to create a NodeMCU ESP8266 WiFi jammer although technically, this is a deauther and not really a jammer. A jammer sends out noise on the WiFi frequency spectrum (2.4 GHz) while the program in this tutorial sends packets that disrupt the normal functions of …

The NodeMCU is an Arduino-compatible board that features the ESP8266 at its core. It became popular because it is a WiFi-ready microcontroller by itself - no need for an Arduino. This NodeMCU pinout reference aims to show pinouts for NodeMCU v0.9, NodeMCU v1.0, and NodeMCU v3.

I2C, or Inter-integrated Circuit, is a communications protocol common in microcontroller-based systems, particularly for interfacing with sensors, memory devices and liquid crystal displays. Similar to SPI, it's a synchronous protocol because it uses a clock line. The I2C protocol, however, uses less pins and is a much more robust standard.

SPI, short for Serial Peripheral Interface, is a communication protocol common in microcontroller systems. Sensors, liquid crystal displays and memory cards are examples of devices that use SPI. It is faster than both UART and I2C although it also has its disadvantages.