Temperature, Humidity and ON/OFF Relay
In addition to standard Watchman features (i.e. Temperature, Humidity), it provides an option to operate a relay. You can use relay to operate any (electric) appliance. Relay operation is a programmed operation - based on Temperature or Humidity values that you will configure on pp-Code portal.
Here is how it works:
Here is an example:
All standard features apply. It offers relay operation along with Temperature and Humidity readings as well as corresponding email / SMS alerts.
There is a built-in safety feature that will de-energize (OFF) the relay if it stays ON for too long. The default value is 12 hours. It provides a safe operation for an appliance (connected to the relay) if it ends up running continuously for a long duration. You can change the default setting via the pp-code portal.
There is a 10 minute (not configurable) cooling period, after which, relay (hence the connected appliance) will automatically resume it's normal operation.
Watchman's relay is rated for 10A 250VAC/30VDC, that can operate many regular electric appliances such as bulbs, fans, lights, residential fridge/freezers, kettles, mini radiators and light motors/blowers etc.
Relay offers 3 connectors:
Most common will be using combo of NO and COM (it will turn ON the appliance when relay is energized).
Connect the hot wire, to appliance, via the relay as following:
As relay is energized, it will complete the complete the circuit (i.e. connecting COM and NO) and turn ON the appliance. As relay is de-energized, circuit will break and turn OFF the appliance.
Relay is programmatically energized/de-energized based on the settings that you configured on the pp-code portal (as explained in the section above).
Watchman relay can also be used to operate heavy electric appliance - with the help of an intermediate (High Amp) Relay.
If you plan to operate heavy appliances (such as heaters, air conditioners, industrial blowers etc) that draw more than 10A, you can't connect them directly to Watchman relay. Instead, you will use Watchman relay to operate an intermediate (High Amp) relay that connect to and operate your heavy appliance (as shown above).
There are many High Amp relay options available. Please make sure that:
We have tested using a generally available relay at Amazon, however any similar relay would work.
Programmatic operation (of relay) and user settings follows the same process, that is: