In our previous article we use ESP8266 working as Station mode. In Station mode we need a wireless router for connecting ESP8266 module. In this article we use SoftAP mode of ESP8266. In Access Mode the ESP8266 works as 2.4GHz wireless router and maximum 4 devices can connect with this router. Before starting please go […]
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WiFi (Wireless Fidelity) is a technology that allows devices to connect to the internet or communicate with each other wirelessly using radio waves. It operates based on the IEEE 802.11 standard, enabling high-speed data transfer over short distances. The ESP8266 operates exclusively in the 2.4 GHz frequency band. It supports WiFi communication based on the
Bluetooth is a wireless technology used for short-range communication between devices. It operates using radio waves in the 2.4 GHz frequency range and is commonly used for connecting peripherals like headphones, speakers, keyboards, mice, and even smart home devices. There are different versions of Bluetooth, with newer versions (like Bluetooth 5.0, 5.1, and 5.2) offering
The universal synchronous asynchronous receiver transmitter (USART) offers a flexible means of Full-duplex data exchange with external equipment requiring an industry standard NRZ asynchronous serial data format. The USART offers a very wide range of baud rates using a programmable baud rate generator. It supports synchronous one-way communication and Half-duplex Single-wire communication, as well as
In our previous article we use AHT20 sensor which can measure temperature & humidity. But it can’t measure air biometric pressure, so we use another sensor either BME280 or BMP280. Both BMP280 & BME280 can measure biometric pressure & temperature, but BME280 has one extra feature of measuring humidity along with temperature & pressure. In
The Universal Serial Bus (USB) is technology that allows a person to connect an electronic device to a computer. It is a fast serial bus type. The STM32 performance line embeds a USB device peripheral compatible with the USB full-speed 12 Mb/s. The USB interface implements a full-speed (12 Mbit/s) function interface. It has software-configurable
Some time we need a square door lock or square entry for security reasons. RFID card has a unique ID with 1Kb ram. We can write or read from the memory block. The MFRC522 is a highly integrated reader/writer IC for contactless communication at 13.56MHz. Since on board we have 27.12MHz frequency, we have to
In ATmel section we learn about ADC (Analog to Digital Converter). In AVR microcontroller we have 10bit ADC: 210 , but in STm microcontroller we have 12bit ADC: 212. In AVR we have 5V as reference voltage that’s work on most sensors, but in STm microcontroller we have ref voltage 3.3V. The voltage 3.3V divide
In ATmel section we learn about watchdog timer. In STm32 we have system window watchdog (WWDG) & independent watchdog (IWDG). Not all STm32 family has IWDG feature but all have WWDG feature. The system window watchdog (WWDG) is used to detect the occurrence of a software fault, usually generated by external interference or by unforeseen
In this article we interface servo motor & use ultrasonic sensor to detect small object. In our case the servo motor will rotate 450 in each step and ultrasonic sensor detects any object nearby. Before start first go through my servo motor control & ultrasonic sensor article. In our basic timer part we learn about
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