Smart Washing Machine

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This project shows how to control a washing machine in a home automation environment using MQTT.

The LEDs of the washing machine are read using photoresistors attached to digital pins of the WeMos. Using a 10kOhm resistor a voltage divider is formed. The 10kOhm pulls to ground and the photoresistor pulls to Vcc. Since the resistance in the dark is high the pull down dominates. Illuminated, the photoresistor pulls the level at the pin over the high threshold. This way the digital pin can read if the LED underneath the photoresistor is lit.

A MG90s servo motor is used to push a button. The servo signal is generated using PWM at 50Hz with a valid duty cycle between 5 to 10%.

Ass MQTT Broker a Raspberry Pi with Mosquitto is used. See here.

Code & 3D Models

For the firmware Mongoose OS is used. The code is Java Script run on the default esp8266 image. Models are available as blender files and stl. All files can be found here:

https://github.com/bitluni/SmartWashingMachine

Mongoose OS can be downloaded here:

https://mongoose-os.com/software.html

Apps

The MQTT apps used have been MQTT Dash and MQTT Snooper for android devices. (Sorry, have no Apple devices)

Node-RED Flow

This is the current Node-RED flow as shown in How to Node-RED!

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msg.topic = \"countdown\";\n msg.payload = \"\";\n return msg;\n }\n}\nif(msg.topic === \"tick\" && context.countdown > 0 && context.active)\n{\n context.countdown--;\n msg.topic = \"countdown\";\n msg.payload = context.countdown;\n return msg;\n}\n\n","outputs":1,"noerr":0,"x":936.0005683898926,"y":696.6667890548706,"wires":[["79174afc.970154","dbc5c3f7.eca9d"]]},{"id":"79174afc.970154","type":"ui_text","z":"a34f2e41.dd53a","group":"335f2e6.c0353d2","order":7,"width":0,"height":0,"name":"countdown","label":"Countdown","format":"{{msg.payload}}","layout":"row-spread","x":1165.167091369629,"y":693.0002031326294,"wires":[]},{"id":"6b75c69.6340e38","type":"ui_switch","z":"a34f2e41.dd53a","name":"","label":"Enable 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Date.now()) / 1000));\nreturn msg;","outputs":1,"noerr":0,"x":683.9999656677246,"y":688.0000371932983,"wires":[["caf8cadc.339188"]]},{"id":"335f2e6.c0353d2","type":"ui_group","z":"","name":"Washing Machine","tab":"d31f8864.3cea88","order":2,"disp":true,"width":"6"},{"id":"171132c7.ece67d","type":"mqtt-broker","z":"","broker":"localhost","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":"60","cleansession":true,"willTopic":"","willQos":"0","willPayload":"","birthTopic":"","birthQos":"0","birthPayload":""},{"id":"d31f8864.3cea88","type":"ui_tab","z":"","name":"Washing Machine","icon":"dashboard","order":2}]
 

Parts

WeMos microcontroller:
http://s.click.aliexpress.com/e/jUfAmUF
http://ebay.to/2skrCE1
http://amzn.to/2saaoKL

Photoresistors:
http://s.click.aliexpress.com/e/IUJYVrN

Photoresistor modules:
http://s.click.aliexpress.com/e/vzrvN3j

MG 90s:
http://s.click.aliexpress.com/e/7eAAQz7

…more links to come

These links support my work at no additional cost for you. They are just a reference so you can find the right parts.