4 Using dAISy
Using dAISy is as simple as connecting it with an antenna and a PC and powering up your AIS capable
application of choice. When plugged in, dAISy automatically starts to listen for AIS transmissions.
4.1 Interpreting the status LEDs
The dAISy HAT has two two-color status LED, giving us some indication about how it’s feeling. Each LED
represents one of the two AIS channels.
Short GREEN flash every 5 seconds
dAISy is well and alive and in receive mode.
While in receive mode, the mode dAISy starts in when powered up, it will very briefly blink green every 5
seconds to indicate that everything is ok.
Long GREEN flash
Yay! dAISy received a valid AIS packet.
For every packet received and passing all error checks, the LED will turn green for ¼ second. At the same
time, dAISy will send the received message to the Raspberry Pi.
Long RED flash
dAISy received an invalid packet.
dAISy caught the start of a package, but the received data did not pass other sanity checks like encoding
standard or checksum. It might be a ship just out of range, interference from another radio source, or
just random noise.
Don’t panic, you will see a lot of red even under optimal conditions.
RED turned on permanently
dAISy failed to initialize the radio IC.
Shut down the Raspberry Pi and remove power. Plug it in again and see if this resolves the problem. If
the condition persists, there might a hardware issue with your device. Please contact us.
Fast regular blinking RED
dAISy encountered an unexpected system error.
Shut down the Raspberry Pi and remove power. Plug it in again and see if this resolves the problem. If
the condition persists, there might a hardware issue with your device. Please contact us.
No LED activity
Most likely, dAISy is not in receive mode because you are using the configuration menu.
Connect to dAISy with a serial terminal and press ESC. A message should tell you that it entered AIS
receive mode and the green LED should start to blink every 5 seconds.
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