Abstract

• In this research, the data such as temperature and humidity from one ESP board is transferred to the other two ESP boards using ESP_NOW protocol. ESP_NOW is one of the connectionless communication protocols. It can transfer data in the form of short packet transmission. Multiple devices can talk to each other in ESP_NOW protocol. In this research, data are transferred from one-to-many boards. One ESP32 board functioned as the data sender while two other ESP32 boards are used as receivers. ESP8266 boards or Wemos boards can be also used instead of ESP32 boards. DHT 11 sensor is used to obtain the data of temperature and humidity. The messages from the sender are visualized in a serial monitor or PuTTY. The receiving data are displayed on the I2C LCD as well as on the serial monitor or PuTTY. The proper data transferring range is also measured.