💡 Details

Power

The Smart Garden can be powered in two ways: through the USB-C (only for programming and testing purposes) or through the AC Input, but not simultaneously.

AC Power

The Smart Garden is powered directly through a Power Jack connector located on the bottom part of the board. The recommended size for the input connector is a 5.5mm (outer) and 2.1mm (inner) diameter power jack.

As the Smart Garden was designed to control sprinkles, it is expected to be powered with a 24VAC source, such as the NIMO YL15-2401000 220VAC to 24VAC (1A).

Alternatively, and if you are not expecting to control AC sprinkles, powering the board from any VDC in the range of 12-24V is posible as well.

Note

Choose always a power supply that can deliver the same or more (within the Technical Specifications limits) voltage than your loads (solenoid valves/ pumps), as the DC/DC regulator operates as a step-down converter.

The Power LED indicator is disconnected by default, under normal working circumstances this would be an unnecesary energy waste. For enabling it you just need to solder the jumper placed side the silkscreen bulb, located on the bottom layer. For more info, visit the Jumpers section.

I/O

The Smart Garden supports up to 4 independent relay outputs, 4 analog inputs and anoter 4 digital inputs/outputs:

Pinout table

GPIO	Name
1	In 1
2	In 2
3	In 3
4	In 4
5	Out 1
6	Out 2
7	Out 3
8	Out 4
10	Relay 1
11	Relay 2
12	Relay 3
13	Relay 4

Relays

Each one of the relays can only be on True/False states. However, the type of output voltage that the relays deliver can be assigned previously via hardware:

Next to the power jack connector, there are 4 slide switches that configure each of the 4 outputs as DC or AC:

• If the 24 VAC is selected, the controlled relay will output 0 or 24VAC. This is the way to control solenoid valves such as the Hunter PGV series or the Gardena’s Irrigation Valve 24V

• If the VDC is selected, the controlled relay will output 0 or a fixed regulated 12 VDC voltage.

The connection port of each of the outputs is located on the top left part of the board and is done through 3.5mm screw terminals. The polarity of the connection (for DC operations) is defined on the PCB silkscreen.

As an indicator that the relay is being activated, a LED will turn on/off, depending on the relay’s state.

From left to right, the pin definion of each output is:

Relay 1

GPIO10

Relay 2

GPIO11

Relay 3

GPIO12

Relay 4

GPIO13

Auxiliar inputs/outputs:

The connection port for these auxiliar pins is located on the top right part of the board and is done through 2.54 pins.

These pins are grouped in 4 sets, containing:

Auxiliar 1

GND, GPIO5 & GPIO1

Auxiliar 2

GND, GPIO6 & GPIO2

Auxiliar 3

GND, GPIO7 & GPIO3

Auxiliar 4

GND, GPIO8 & GPIO4

Error

The silkscreen on the board is wrong, the right one should be:

Hint

These pins can be used to read if a pushbutton has been pressed and therefore activate the LED ring on the pushbutton, or simply to read any additional sensor like an analog soil moisture probe.

Communications

In addition to the I/O mentioned before, there is also a direct connection to:

IIC (\(I^2C\)) bus:

SDA

GPIO33

SCL

GPIO34

Serial bus:

Tx

U0TXD

Rx

U0RXD

Enclosure

The Smart Garden has been designed to fit in the electronics enclosure LK-PLC01, compatible with DIN rails and screws, and it is recommended for indoors only.

External size

115x90x40mm

Material

ABS Plastic

Color

Transparent cover, black or beige base