Differences

This shows you the differences between two versions of the page.

--- housemon [2022/11/11 11:04] – [Data Collection Nodes] glen
+++ housemon [2022/11/13 12:27] (current) – glen
@@ Line 8: / Line 8: @@
 {{ :housemon.drawio.png?direct&400 |}}
-===== Telemetry Aggregator =====
+The telemetry and sensing functions include:
+  * HVAC run monitoring: current measurement to determine when compressor and air handler are running, detect conditions where they are running too long, too often or out of sync.
+  * HVAC temperature monitoring: measure temperature output at one or more vents, compare to ambient temperature and outside temperature, detect when the temperature delta begins to narrow which may indicate refrigerant leak or other problems.
+  * HVAC air flow: trend air flow velocity to detect when filters need to be changed
+  * Appliance current monitoring to detect usage: especially for EV chargers to determine use patterns and estimate costs. Monitoring hot water heater can detect trending that may indicate problems. Can also detect burned out bulbs by correlating a switch that is on with low current draw.
+  * Ambient temperature and humidity: detect trends that may lead to problems due to high humidity in certain rooms or crawl space. Can also warn of freezing temperatures which may lead to problems.
+  * Pool water level: detect water level drops that may create operational problems
+  * Pool water temperature
+  * AC mains availability: report on outages
+  * Water flow measure: detect system leaks, faucets left open
+  * Water leak detector: detect presence of water to detect leaks
+  *
+===== Components =====
+==== Telemetry Aggregator ====
 The is a set of nodes that receive data from gateway nodes and stores it for rendering in graphics or generating alerts.
-===== House Gateway Node =====
+==== House Gateway Node ====
 The gateway node is responsible for:
@@ Line 22: / Line 37: @@
   * System monitoring and management
   * Some telemetry collection where appropriate - so it may serve as a data collection node as well as a gateway
+The Gateway node hosts a wifi network that uses credentials to join - this is the only security for the link between the gateway and data collectors.
 [[Gateway Node Hardware|Gateway Node Hardware]]
-===== Data Collection Nodes =====
+==== Data Collection Nodes ====
 Data collection nodes are connected to sensors and generate telemetry that is fed into the system.
@@ Line 30: / Line 48: @@
 [[Data Collector Protocol]] describes the protocol recognized by the data collection nodes