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gioblu
PJON
C++2015–2022
gioblu / PJON

PJON

PJON (Padded Jittering Operative Network) is an experimental, arduino-compatible, multi-master, multi-media network protocol.

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Explore on GitHubRead Hacker News discussions
13Distinct people
105Mentions
0Explicit recommenders
2.8KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

PJON (Padded Jittering Operative Network) is an experimental, arduino-compatible, multi-master, multi-media network protocol.

GitHub

Where it is used

No documented product use was verified in the last source check.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 7:24:48 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year105 dated mentions

Observed mentions: 2015-08-07 02:16:44 UTC to 2022-12-20 15:15:32 UTC.

01020302015-01-01 00:00:00 UTC to 2016-01-01 00:00:00 UTC (exclusive): 6 mentions; 4 submissions, 2 comments20152016-01-01 00:00:00 UTC to 2017-01-01 00:00:00 UTC (exclusive): 12 mentions; 11 submissions, 1 comments2017-01-01 00:00:00 UTC to 2018-01-01 00:00:00 UTC (exclusive): 14 mentions; 9 submissions, 5 comments2018-01-01 00:00:00 UTC to 2019-01-01 00:00:00 UTC (exclusive): 7 mentions; 5 submissions, 2 comments20182019-01-01 00:00:00 UTC to 2020-01-01 00:00:00 UTC (exclusive): 29 mentions; 13 submissions, 16 comments2020-01-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 24 mentions; 5 submissions, 19 comments2021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 11 mentions; 1 submissions, 10 comments2022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2022

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20152015-01-01 00:00:00 UTC2016-01-01 00:00:00 UTC642
20162016-01-01 00:00:00 UTC2017-01-01 00:00:00 UTC12111
20172017-01-01 00:00:00 UTC2018-01-01 00:00:00 UTC1495
20182018-01-01 00:00:00 UTC2019-01-01 00:00:00 UTC752
20192019-01-01 00:00:00 UTC2020-01-01 00:00:00 UTC291316
20202020-01-01 00:00:00 UTC2021-01-01 00:00:00 UTC24519
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC11110
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC202

What Hacker News says

24 sources
gioscarab·Dec 20, 2020
Here you can find the implementation of PJDL used by Jack Anderson to determine the maximum range: https://github.com/gioblu/PJON/tree/master/src/strategies/So... All devices listed in the compatibility section are able to communicate over a twisted pair with no additional hardware, as Fred well noted, you just need one wire and connect directly the IO pins. And up to 255 devices can share the same twisted pair. As you can read in Video Camera Control Jack just used two arduinos, 2km of wiring within his university's network and a couple of pull-down resistors. The protocol works even when the human body is used as a conductor as shows the gif present in the article. On social compare someone made this: https://socialcompare.com/en/comparison/comparison-of-networ... I think the comparison between PJON and LIN there is revealing. As you ca
Read the rest
n see LIN handles up to 16 devices, it is master-slave and has a range of 40, with a complex front-end at a relatively high voltage. PJON is free for use, it is all open-source. We do sell products to fund the development of the project.
In How we made the PJON network protocol from scratch
gioscarab·Dec 20, 2020
Ciao jlgaddis Jack in Video Camera Control used PJON over PJDL which is a wired data link that needs only ground and a data cable to connect up to 255 devices, cables can be up to 2km long at the slowest baudrate (1.97kB/s - 15808Bd). PJDL in few words is a sort of open 1-Wire with a longer range, support for more devices and a stronger immunity to noise. See: https://github.com/gioblu/PJON/blob/master/src/strategies/So... The core of the community uses PJON over PJDL in home automation systems, irrigation systems, feeding systems ecc. Soon Mysensors will include PJON over PJDL in their list of supported transports. PJON works also over TCP, UDP, MQTT, ESPNOW, LoRa ecc. so generally a router is built and programmed to run 2 instances of PJON for example PJDL and MQTT, to then route data to and from a process running on a real-time operati
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ve system See: https://github.com/gioblu/PJON/blob/master/examples/routing/... which can also run PJON thanks to the wide support of the implementation. See: https://github.com/gioblu/PJON/wiki Looks to be handy for many to connect devices, even on different media. Although many also use PJON to implement mesh or peer-to-peer networks, there is a group in Australia building such a network using PJON over LoRa. I must say I hope we will be able to start building a private network infrastructure with it, that would be awesome. Companies and institutions are also implementing PJON within their products and services. AD24, a Czech company, recently created a mesh network over PJON to connect advertising monitors around the city of Prague. It looks there are also few companies in Germany which use PJON to create real world automation systems. Recently contacted by the Universitat Politècnica de València (UPV) to support the development of a PJON network of temperature and humidity sensors to monitor the vault of the Cathedral of Valencia and avoid its decay, I hope this will end up done, it would be really rewarding.
In How we made the PJON network protocol from scratch
d4r114·Aug 8, 2020
I see the same approach being rarely applied today, most protocols are done by regimented groups of competitive people that just want to see their idea being standardised, the result is often complex and inefficient constructs. I do see the folks of the PJON project being the few trying to replicate the approach and the development environment described by the author: https://github.com/gioblu/PJON
In Steve Crocker on the History of RFCs
gioscarab·Jun 21, 2020
Made a new release of PJON: https://github.com/gioblu/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 operates on a wide range of media and protocols like TCP, UDP, MQTT, ESPNOW, USB, Serial, RS485, LoRa, PJDL, PJDLR and PJDLS.
In Ask HN: What did you make during lockdown?

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