Hey guys I have a problem. I need a device to send command to raspberry pi.
Let me explain:
I have a switch that I have setup years ago, I need to measure the state of the switch. If the switch is on I want a sensor to measure it is on or off. I mean if the switch is turned on, it must have electric pass through (obviously), now I need something to connect to the end of the switch to fire a command to the pi if electric current is presence (using wifi, zwave, zigbee anything)
There are plug-in appliance modules that let you control a device (on/off) remotely via WiFi, zwave, or zigbee. Your application doesnāt appear to need the ability to control the device but some of these modules also monitor the amount of power consumed. There are examples, here on this forum, of people using power consumption as a means of determining if the device is actually operating. For example, a TV may be in standby mode and drawing very little current. However, when it is truly ON it is consuming more power and the module will report an increase in power consumption.
EDIT
Most of these āpower monitoringā devices are based on a magnetic current sensor. Hereās a homebrew version (the magnetic current sensor is plainly visible) but the appliance module I described offers the convenience of a neat, ready-built solution.