DIY Smart Laundry - Electric Dryer Voice Notifications

Do you use an electric dryer and need a solution to send voice notifications when the cycle is complete?  Let's build a simple non-invasive DIY sensor that monitors the electrical draw from the dryer using a Wemos D1/NodeMCU, a couple resistors, capacitor and a split core current transformer.  You can also apply this same project to many other electrical monitoring projects in the home. 

Parts List
Split Core Current Transformer
Wemos D1 Mini 
10µF Capacitor
10k Resistors 
Preformed Jumpers

Alternative NodeMCU 8266 
Alternative NodeMCU 8285

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Sample Home Assistant Config

  - platform: mqtt
    name: "Dryer Current"
    state_topic: "digiDryerMon-4A443E/SCT"
    unit_of_measurement : "A"
    icon: mdi:flash-circle
    availability_topic: "digiDryerMon-4A443E/LWT"
    payload_available: "Online"
    payload_not_available: "Offline"

  - platform: mqtt
    name: "DryerMon Signal"
    state_topic: "digiDryerMon-4A443E/RSSI"
    unit_of_measurement: "dBm"
    availability_topic: "digiDryerMon-4A443E/LWT"
    payload_available: "Online"
    payload_not_available: "Offline" 

  - platform: mqtt
    name: "DryerMon Status"
    state_topic: "digiDryerMon-4A443E/BUILD"
    availability_topic: "digiDryerMon-4A443E/LWT"
    payload_available: "Online"
    payload_not_available: "Offline"

Sample Home Assistant Voice Notifications from the S31 Video -


  1. Hi, I'm having trouble with this. My d1mini keeps rebooting. When I watch the serial monitor, I see it connect, run for a little, and then say "Soft WDT reset", then there's a stack dump, and then says "rst cause:2, boot mode:(3,7)" Any thoughts on what might be wrong? Thanks!

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