November 15, 2019  New product: NMEA 2000 Run Indicator

The device visualizes DC loads on NMEA 2000 displays, analyzes power consumption and can warn you about fresh water or seawater leaks.

Yacht Devices NMEA 2000 Run Indicator

At the beginning of crossing the Atlantic in 2013, a crewmember on one of the yachts found that they forgot to fill one of the water tanks. He switched the fresh water system to use the second tank, but few hours later, he realized that they were then down to water in bottles. In a fuss, even an experienced yachtsman can easily draw the wrong conclusion.

The Run Indicator has 4 channels to connect DC loads with operating voltage up to 40V and current up to 10 A (15 A peak). Thanks to built-in measurement shunts, it is very easy to install. On modern chart plotters, you can see the state of channels (including current) as digital switching equipment, and for legacy displays, the device can send data as though it were four virtual NMEA 2000 batteries.

The device can turn on and off channels of digital switching equipment based on user rules. For example, with the Yacht Devices Circuit Control, it can turn off a load if the current is too high or alert with a sound alarm using Yacht Devices Alarm Button. User rules offer special algorithms to analyze bilge and fresh water pumps. For example, you can configure the an alert to sound when the fresh water pump turns on at regular intervals, since this is likely caused by a leak steadily draining the system. Or when the bilge pump turns on frequently, or when the shower pump works too long.

On a rented boat or with a new crew, it is easy to miss the visual signal on the panel that some pump or other equipment is on, and in windy weather, it is easy not to hear. The Run Indicator makes analog loads visible for the helmsman, and can be configured to attract the attention in some typical situations.

The Run Indicator has a 85x45x25mm case and is equipped with an NMEA 2000 Micro Male connector. The NMEA 2000 interface has high-voltage galvanic isolation from loads, and the typical power consumption is 50 mA. Multiple devices can be installed across a NMEA 2000 network.

The Run Indicator will be presented at the Yacht Devices booth #5.455 at the METS Trade expo on November 19, and will be available for order in November for USD $189.

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 November 14, 2019  New firmware for Tank Adapter

With the new firmware, the device can control NMEA 2000 digital switching equipment. The data damping interval now can be increased to improve liquid volume readings stability in rough sea conditions.

NMEA 2000 Tank Adapter with digital switching support

We have already added the option to control standard NMEA 2000 digital switching equipment using our smart sensors. The time has come to add the same feature to our Tank Adapter.

With the new firmware, you will be able to control NMEA 2000 digital switching equipment managed by the NMEA 2000 "Switch Bank Control" PGN 127502. Compatible equipment includes our own products:

You can set 4 rules to turn the digital switching equipment channels ON and 4 rules to turn them OFF. Rules can be set with either a configuration file on a MicroSD card or "YD commands" which can be sent to the Device by setting NMEA 2000 installation description Fields.

For example, with those rules you can create a tank monitoring system with audible alarms using our Alarm Button YDAB-01. You will be able to hear an alarm when the tank fluid level is too low, or while refilling the tank when it is almost full.

Below, we will show how to handle the following situations:

First we need to set up an Alarm Button YDAB-01 and upload 4 custom sounds (voice messages) in slots number 25—28. We generated voice messages for you (see links above) using Text2Speech.org (this free service was first in Google, we did not cost services) and adjusted the frequency of WAV files to 22 kHz with free Audacity software.

Then set the YDAB-01 Digital Switching "bank number". We will use bank number 1 in the example configuration below. Then we need to configure the Tank Adapter and set the rules. If a MicroSD card is used, the rules will be:


  # Empty tank, <1% for 15 seconds, bank 1, channel 25 ON
  SW1_ON=<1 15 1 25
  # Immediately cancel empty tank alarm, if the level is >1%, bank 1, channel 25 OFF
  SW1_OFF=>1 0 1 25

  # Low fluid level, <20% for 60 seconds, bank 1, channel 26 ON
  SW2_ON=<20 60 1 26
  # Cancel low fluid level alarm, if the level is >20% for 30 seconds, bank 1, channel 26 OFF
  SW2_OFF=>20 30 1 26

  # Refueling complete, >96% for 20 seconds, bank 1, channel 27 ON
  SW3_ON=>96 20 1 27

  # Sensor failure for 3 seconds, bank 1, channel 28 ON
  SW4_ON=ER 3 1 28
  # Cancel sensor failure alarm, turn bank 1, channel 28 OFF
  SW4_OFF=OK 3 1 28

One of our customers noticed that the fluid level values reported by YDTA-01 are too sensitive to the boat attitude and that level readings fluctuate a lot in rough sea conditions. YDTA-01 already has a signal damping feature, but the data damping time constant was fixed to 3 seconds.

Now it is possible to set the damping constant explicitly with DAMPING settings. We have also modified and added the corresponding "YD commands", so you can perform the Device configuration using an installation description strings.

Command responses have also been modified: if the command is sent to the Device and the parameter is omitted, it will reply with the current parameter value.

Firmware Update for Tank Adapter YDTA-01 (1.05) is available on the Downloads page. Please check the updated YDTA-01 manual for additional details.

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 November 13, 2019  New product: NMEA 2000 Battery Monitor

The device reports battery voltage, current, health and charge state to NMEA 2000 and can turn on the genset or warn when the battery state is critical.

Yacht Devices NMEA 2000 Battery Monitor YDBM-01N

There may be many reasons not to turn on the engine: the watch has just changed, your wife is a light sleeper, or just to feel the magic of sailing in silence. But even deep cycle batteries may die unexpectedly fast despite the price and the brand. And the magic time of sailing in harmony with nature will be shorter and shorter.

The Battery Monitor gives control over the discharge of your batteries including turning off unnecessary loads in advance, and warning you or your crew when batteries are flat, or even automatically turning on the genset. The device is designed to work with a standard 75 mV shunt (not supplied with the device) with no limits for rated current (shunts in the range from 5A to 1200A are widely available). 50 and 100 mV shunts can also be used with limits in range and accuracy.

The Battery Monitor can be configured to use data from a NMEA 2000 thermometer connected to the battery to detect the charge state and health more accurately. The device configuration can be uploaded from a text configuration file on a MicroSD card. The chemistry, nominal capacity and voltage, and other parameters can be set, including custom discharge curve if required.

The user can also specify digital switching channels to turn on to raise alarms (for example, with Alarm Button) or to run the genset, and set custom rules for actions. The device is compatible with digital switching and alarm units managed with standard NMEA 2000 PGNs 127501/127502.

The device can also be used to provide NMEA 2000 devices, including chart plotters and data recorders, with the actual performance of wind generators, solar panels, alternators and other DC sources or loads (windlasses, fridges) with operating voltage up to 40V.

The device's case is 54mm in length, and is equipped with a NMEA 2000 Micro Male or SeaTalk NG connectors. The device can be connected directly to the backbone, no NMEA 2000 drop cables are required.

The Battery Monitor will be presented at the Yacht Devices booth #5.455 at the METS Trade expo on November 19, and will be available for order in January for USD $149.

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