https://github.com/lab11/nucleum
½ inch² sensor node designed around the nRF51822. Based on the atum project.
https://github.com/lab11/nucleum
Last synced: about 2 months ago
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½ inch² sensor node designed around the nRF51822. Based on the atum project.
- Host: GitHub
- URL: https://github.com/lab11/nucleum
- Owner: lab11
- Created: 2015-04-17T16:21:31.000Z (about 11 years ago)
- Default Branch: master
- Last Pushed: 2017-05-15T19:29:16.000Z (about 9 years ago)
- Last Synced: 2025-03-12T17:50:31.581Z (about 1 year ago)
- Language: Eagle
- Homepage:
- Size: 34 MB
- Stars: 3
- Watchers: 14
- Forks: 3
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
Nucleum
====
Nucleum is a ½ inch² drop-in sensor node module designed to enable rapid
prototyping of Bluetooth Low Energy embedded devices.
The core of Nucleum is the NRF51822
SoC with an Arm Cortex M0 and BLE radio stack. Nucleum also includes an
antenna, 4 kilo-bytes of non-volatile FRAM memory, an RTC, and a tri-color LED.
Nucleum is designed to have two different usage patterns. First, three sides
of the device have castellated headers allowing Nucleum to be directly
soldered onto a carrier PCB. Nucleum handles all of the computation and
communication while the carrier board supplies power and attaches
sensors or other peripherals. In the second option, Nucleum can function
as a complete sensor node. On the bottom are pads for a regulator
and a battery. If needed, a peripheral or sensor board can be stacked on
top using the headers as a bridge.
History
-------
Nucleum is directly derived from [Atum](http://www.github.com/lab11/atum). It
changes the radio protocol to BLE and adds an on-board programmer. Like Atum,
it is intended to be a building block for sensor platforms that only includes
the features that a sensor board needs.
Visit the [Atum](http://www.github.com/lab11/atum) page to read more about its
origins.
Name
----
Nucleum is the latin accusative form of 'Nucleus' which, like [Atum](http://www.github.com/lab11/atum),
represents a basic building block of matter. The 'LE' in the spelling of Nucleum
indicates its use as a Bluetooth Low Energy prototyping board, and the 'UM' at
the end of Nucleum represents Nucleum's development at the University of Michigan.
Usage
-----
To use the NRF51822, you should run bare metal code that is built around
the Nordic SDK and software BLE stack (known as a softdevice). We provide
some examples and drivers for the chips on the Nucleum board. For more information
on getting started please see software/README.md.
PCB
---
Nucleum PCBs are panelized into 5x8 panels. They are designed to be
1mm thick to allow for easy soldering of the castellations on the edge of
the board.
If you use the battery and regulator on the bottom of the board, you will have
to populate a 0 Ohm resistor to select regulated voltage. The selection is between 1.8V
and 3.0V. Position A is 1.8V and position B is 3.0V. The 1.8V selection was included
because it significantly lowers power draw on the NRF51822, but at this voltage
the RTC and FRAM may not work. Please see the
[hardware pdf](https://github.com/lab11/nucleum/raw/master/hardware/nucleum/rev_a/nucleum.pdf)
to locate this resistor selector.
DO NOT populate both position A and B; this will short the battery.
Pin Out
-------
