Easily build a custom, wirelessly-connected scale. The OpenScale IoT features an ESP32-PICO-MINI for Bluetooth configuration and WiFi data streaming with any standard load cell.
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Building a custom, high-accuracy scale shouldn't require writing complex code from scratch. The SparkFun OpenScale IoT takes the hassle out of measuring weight and temperature with an easy-to-use, wireless solution built around the powerful ESP32-PICO-MINI. This updated version of the original SparkFun OpenScale supports multiple load cell types and lets users access the device via multiple interfaces of their choosing. That means, regardless of whether you are monitoring the static load of a beehive over several months or need to precisely weigh the right amount of beans for the perfect cup of coffee, this board turns any standard load cell into a fully functional, wirelessly connected weighing system.
Getting your OpenScale up and running is incredibly simple. Just attach any four or five-wire load cell, and you'll be able to configure your calibration, sample rates, and precision through a straightforward terminal menu. This enables you to turn a load cell or four load sensors, arranged in a Wheatstone bridge configuration, into a DIY weigh scale for whatever the application.
Connecting the OpenScale IoT to a Bluetooth host device requires a terminal application installed on it; if you're connecting it to a phone or other mobile device, make sure to install a terminal application of your choice. However, if connecting to this OpenScale wirelessly isn't quite your style, you can still interface with it via a wired serial connection over USB-C or serial port.
To ensure you get the most accurate data possible, the OpenScale - IoT combines multiple sensing technologies into a single footprint. The onboard HX711 acts as a 24-bit ADC when, let’s say, you attach four individual strain gauges to read your Wheatstone bridge using a combinator with high precision.
The OpenScale design is intended for projects and applications where the load is static or where constant readings are needed without user intervention (for example, on a conveyor belt system). A load cell equipped with an OpenScale IoT can remain in place for months without user interaction! Because physical load cells can drift slightly with environmental changes, the board also features an integrated TMP102 sensor to log ambient temperature. We even added a 3-pin screw terminal to attach an external temperature probe using the one-wire interface directly at the measurement site!
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