The "Padded Jittering Operative Network" protocol (PJON)


PJON® (Padded Jittering Operative Network) is an Arduino compatible, multi-master, multi-media network protocol. It proposes a new Open Standard, it is designed as a framework and implements a totally software-defined network protocol stack that can be easily cross-compiled on many MCUs and architectures like ATtiny, ATmega, SAMD, ESP8266, ESP32, STM32, Teensy, Raspberry Pi, Linux, Windows x86, Apple and Android.


PJON is used in thousands of devices and its community has spread worldwide because of the following 6 key factors:

  • New technology : PJON is an experimental network protocol stack crafted in 8 years of research and experimentation. It was originally developed as an open-source alternative to i2c and 1-Wire but during development its scope and features have been extended to cover use cases where IP is generally applied. PJON has been engineered to have a variable footprint (4.2-8.2 kB program memory) and overhead (5-22 bytes per packet) depending on its configuration.
  • Multi-media support : PJON packets can be transmitted on a wide range of media and protocols like TCP, UDP, Serial, RS485 and LoRa. The PJON network protocol stack specifies and implements also the PJDL wired data link able to communicate data through a single common conductive element shared by up to 255 devices, PJDLR wireless data link compatible with many ASK/FSK/OOK radio modules, and also PJDLS wireless data link able to communicate through light pulses using off the shelf LEDs and laser diodes easing integration and enabling a lot of applications.
  • Increased security : Devices using Ethernet/WiFi are often vulnerable to ransomware, cyber warfare and private data leak. PJON has been engineered to enhance security not necessarily implementing the standard network protocol stack together with its vulnerabilities where it is not absolutely necessary offering a set of alternatives for many use cases.
  • Increased reliability : Many protocols massively applied worldwide expose dangerous vulnerabilities, have weak error detection algorithms and are not resilient to interference. PJON is based on years of analysis and study not to make the same mistakes present in most alternatives and provide with a set of simpler and more efficient solutions.
  • High flexibility : PJON is totally software-defined and its implementation is designed to be easily extensible. it builds out-of-the-box in all supported devices and operates transparently on top of any supported protocol or medium.
  • Low cost : Without any additional hardware needed to operate, minimal network wiring requirements and direct pin-to-pin or LED-to-LED communication, PJON is extremely energy efficient, cheap to be implemented and maintained. This implementation is kept updated and meticulously tested thanks to the strong commitment of its growing community of end users, testers and developers.


PJON 12.0 – Networking freedom for hackers, makers and experimenters | Hacker News

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