#161 Measuring weight using an ESP32, a strain gauge, and a HX711

Let’s build a connected scale, which alarms us when the food bin is empty. Of course, we will be able to use the same principle to measure the weight of any other good like the honey in remote beehives, or even your own weight to visualize it somewhere in the cloud… So, today we will:

• Measure quite small weights with an Arduino like Microcontroller
• We will need some tricks to do that
• Then, we will build a bowl for our cat which is capable to detect if no food is available anymore
• And we will send a Twitter alarm to our Smartphone

We will also slow down the clock rate of the ESP32 to fit the timing of the HX711chip, and will use an OLED display and an MQTT library.

Links: Sketch: https://github.com/SensorsIot/Weight-Sensors

HX711 library: Based on https://github.com/bogde/HX711. Please use the one in my Github. Otherwise, you will get a compilation error HX711 module: http://bit.ly/2fBZ82W Strain Gauges: http://s.click.aliexpress.com/e/Jqb2biU

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