We will then obtain and periodically print the random numbers on the main loop function. We will start our code by opening a serial connection on the Arduino setup function, so we can output the results of our program. If you prefer, you can check the video version of this tutorial below. The tests of this ESP32 tutorial were performed using a DFRobot’s ESP-WROOM-32 device integrated in a ESP32 FireBeetle board. Īs a lower level analysis of the ESP32 Random Number Generation, you can check this great article. One interesting thing to mention regarding the ESP32 Random Number Generator is that a data sample of 2 GB obtained from it with the WiFi enabled has passed all the tests of the Dieharder Random Number Testsuite, which is a testing suite for random number generators. You can read here an explanation about the difference of these two types of randomness. Īlthough for this simple tutorial it is not relevant if the numbers are truly random or pseudo random, the capability of the ESP32 to generate truly random numbers is very important since they can be used for cryptographic operations. Those true random numbers are generated based on the noise of the WiFi / Bluetooth RF subsystem, which means that if the Bluetooth and WiFi are both disabled, then only pseudo random numbers are generated. In terms of hardware, the ESP32 has a True Random Number Generator, meaning the values obtained from it are truly random. The objective of this post is to explain how to generate random numbers on the ESP32, using the Arduino core. The objective of this post is to explain how to generate random numbers on the ESP32, using the Arduino core. The tests of this ESP32 tutorial were performed using a DFRobot’s ESP-WROOM-32 device integrated in a ESP32 FireBeetle board.
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