This board is a breakout for the Arduino Nano, designed with two principles in mind:

• Flexibility of setup
• Ease of installation and maintenance

Note: a support page for the board can be found here

The board is suitable for permanent or semi-permanent installations such as art/architecture projects, escape rooms, arcade cabinets, tool/machine control, etc...

All the connectors are pluggable, which means swapping out the board is easy in cramped spaces. The board allows for labelling of each connector, so you always have a reminder of your wiring layout.

Because all connectors have their own ground and power connections, wiring up of your project becomes a lot simpler. If you spent a lot of time wiring up Arduinos to those 1/2/4 channel relay boards, you'll know that it can get messy quickly. This board aims to make life easier by making most of those connections for you just by connecting or removing jumpers.

Here's the board features:

For flexibility

Digital Outputs

D3 through D10 are each broken out to a configurable I/O header. Each I/O connection has its own power and ground. Power for each I/O can be selected from either 5V or 12V.

D3 to D6 outputs can be configured to either be connected directly to its output connector or switch a relay.

The relay COM terminal can be connected to 12V, 5V or left open. The NC terminal can be connected to GND or left open. The relay can therefore be used as a simple "dumb" switch or to switch power from the board.

Digital Inputs

When used as a digital input, the input protected by a 10K resistor and clamping diodes. This means high-voltage signals can be directly connected to the header without needing external divider or clamping circuitry.

Analog Inputs

A0 through A2 are each broken out to a configurable I/O header. Each I/O connection has its own power and ground. Power for each I/O can be selected from 5V or 12V.

Note that unlike the digital inputs, these inputs are not protected against overvoltage. 5V-GND only!

Other Connections

D0, D1 and D2 are connected to 3-way headers with 5V, signal and GND. These pins not protected against overvoltage

SPI, UART and I2C connections are provided, each with 5V and GND pins.

Reset is broken out to a 2-way header to allow reset via an external switch or other reset circuit.

For ease of installation and maintenance:

All connectors are keyed and pluggable. No tools are required to insert or remove them. This makes replacing the board a lot easier than (for example) unscrewing terminal blocks.

All configuration is via standard 0.1" headers/jumpers. No soldering of jumpers required.

Each connector row has an area of silkscreen for labelling the connections in permanent marker or label tape.

Power

The board is powered from a 12V supply. A DC/DC module provides 5V power up to 1A.

The USB can be connected safely at the same time as the 12V supply without causing damage.

Options

Please select if you would like an Arduino shipped with the board.

I also have an 8-relay version of this board for sale here

Connectors

The board is not supplied with any pluggable terminal block connectors. These are available from Farnell, Mouser, Digikey etc.

Compatible connectors include:

• Camden Boss CTBP92HE/3 (3-way), CTBP92HE/2 (2-way)
• Phoenix Contact MC 1,5/ 3-ST-3,81 (3-way), MC 1,5/ 2-ST-3,81 (2-way)

Any similar 3.81mm pitch connectors should also be compatible.