Project:Nanode
New page for Ken's new project 'Nanode' (formerly 'Ethernet Arduino') For full background and earlier work please see Ethernet Arduino
Open Source Collaborative Projects
The Nanode is possibly the first open source collaborative hardware design project at the London Hackspace- conceived, designed, manufactured and coded by Hackspace members - for Hackspace members. As an exercise in the design and building of a simple but useful microcontroller product, Nanode will introduce minimum cost web connectivity.
About the Nanode - Some Background
The Nanode is a low cost entry device aimed at Internet Connectivity projects. It has been designed to be built easily for under £20 - so that it will appeal to those on a tight budget.
It is based on the Arduino environment so will be familiar to many. It will accept Arduino shields, if necessary with longer pins to improve clearance between the Magjack connector and the underside of the shield.
It consists of a small PCB which has the ATmega328 microcontroller, some glue logic, the ENC28J60 ethernet controller and a Magjack ethernet connector. The board only uses through-hole and DIL conventional components - so that it can be easily assembled by anyone who has basic solderng skills.
It makes an ideal project for a teaching workshop on web connectivity, and as such will appeal to Hackspaces for advanced Arduino workshops.
Yes - but what does it do?
Nanode uses a Ethernet code library developed by Andrew Lindsay. Andrew has provided examples for a Twitter Client (using supertweet.net), a Pachube Publisher and Pachube Subscriber. Andrew has also developed code to allow DNS Client queries and sending UDP packet to a local network.
Nanode can be used as a micro web-server for simple home automation and control, be used to build web connected sensor networks and many other web connected applications.
For those wanting to tinker with M2M applications, two Nanodes can communicate data or commands via a web data service such as Pachube.
Another unique feature is that several Nanodes can be connected together on a multidrop serial bus and used for distributed control tasks, such as energy montoring or home automation. The wired network supplies communications and power and can be made from low cost 4 core telephone cable. Individual Nanodes can communicate via this network back to an ethernet connected "Master" unit. With RS485 driver ICs, the Nanode can be adapted as a DMX lighting controller, MIDI network or other serial control system.
By removing the ethernet controller and Magjack, it becomes a very low cost Arduino "work-alike".
Nanode is an Open Source Project.
Test Drive a Nanode at the Pachube Hackathon April 8th/9th
Ken I will be hosting a Nanode build session at the space on Saturday 2nd April from 10am.
There will be the opportunity to build up 2 pairs of Nanodes and get them talkng to each other via Pachube. There will be 4 Nanodes available for the Pachube Hackathon, with priority given to LHS members. Even if you are not at the event, but want to play with the Nanode at the space, during that event, let me know.
Board waiting list
Elliot has started a Pledge Page so that we can pool component purchasing and get the best price. The cost is £18 per Nanode which is a full kit of parts including pcb.
I would like to do a special London Hackspace branded version with a custom LHS logo on the screenprint. If anyone with EagleCAD experience would like to assist with this artwork please get in touch. As soon as we have this artwork and a minor board update, we can order the next batch. --Ken
Now that we have reached 30 boards, we should consider collecting some money and getting a batch of pcbs ordered from Spirit Electronics. I think that 2 square feet of board will just about fit 40 boards. --Ken
The First Prototypes
Here are the two boards each connected to a network port. The orange and brown wires between the boards is so that they can share the 5V power from the FTDI cable.
The upper board is the Publisher (Putter) and the lower board is the Subscriber (Getter). Every few seconds the Putter sends a new packet of data up to Pachube feed 8729, and at regular intervals the Getter subscribes to this feed to retrieve the data. In this case the data is a simple comma separated list of 6 arguments, which could be six readings from the ADCs on the Putter device, or a numerical command to which the Getter will respond.
Building a Nanode
The complete step by step build sequence can be found on my blog
Parts List
All parts are readily available. I recommend Cool Components in South London for several of the key items. Interested parties should try to pool component purchasing to access volume discounts.
* 1 ATmega328 microcontroller (with Arduino bootloader) - CoolComponents £5.00 (£2.81 without bootloader) * 1 ENC28J60 ethernet controller - CoolComponents 1.99 * 1 Magjack - CoolComponents £1.99
A target price of £18 per unit is achievable if parts are purchased in 10 off. This includes all parts, pcb, shipping and VAT.
The remainder of the parts came from Farnell Components or other suppliers eg Rapid Electronics:
Note! Rapid are much cheaper on IC sockets, SIL connectors, Voltage regulators, crystals and DC power jacks. A subsequent spreadsheet of BOM cost from Rapid showed that they should be the principal supplier, giving a kit cost of £18.
* 1 74AHC125 quad buffer 174-9617 * 1 16MHz crystal 161-1761 * 1 25MHz crystal 161-1783 * 4 22pF ceramic capacitors 114-1760 * 8 100nF ceramic capacitors 121-6444 * 2 10nF ceramic capacitors 121-6435 * 3 10uF electrolytic capacitors 945-1056 * 1 7805 5V regulator 156-4483 * 1 78L33 3V3 regulator 146-7768 * 1 2K resistor 934-1480 * 4 51ohm 1% resistors 934-3342 * 3 270 ohm resistors 933-9353 * 3 10K resistors 933-9060 * 1 tact switch 181-3689 * 2 8 way 0.1" SIL Sockets * 2 6 way 0.1" SIL Sockets * 1 6 way 0.1" right angle header * 1 2.1mm dc jack socket * 1 1N4001 diode * 1 3mm LED * 2 32 pin 0.1" header strips (for optional I/O connectors).
You will also need:
* 1 Nanode pcb - available shortly to Hackspace members * 1 FTDI USB-serial cable - becoming a standard bit of kit for talking to microcontrollers. * or similar USB to serial converter such as Sparkfun/Cool Components * 1 CAT5 network cable to connect to router
Current Build Files
The prototype is Nanode2j and has a couple of minor layout bugs, these have been corrected in 2l. The EagleCAD pcb files have been uploaded to Thingiverse as a starting point, but potential users should read the bug-list on the schematic page.
Questions & Answers & Feedback
If you have any queries - please put them here.
Is the local bandwidth between two nanodes enough to create an ethernet bridge in software? -- Answer to myself: the multidrop bus is in the range of 9600 baud.
The ATmega328 is not limited to 9600 baud serial. If the distance between nodes is short then 115,200baud may be possible. You could also connect nodes together with I2C or SPI. Ken
Can non-members join the PCB batch?
Yes - but note that we are currently only offering a full kit consisting of pcb and all components.
> Thanks. And the same deal in joining in with the full parts order? (£18.00+donation). Do we just add names to the list above?
We have been looking at the practicalities of providing a full kit, and think this is the best way to proceed, at this time.
Bare boards may be available at a later date, but for now the £18 kit is the only option being offered. A small donation to the Hackspace from non-members would be appreciated. Ken
