SparkFun

OpenScale IoT Wireless Load Cell Scale Controller

Name: OpenScale IoT Wireless Load Cell Scale Controller
Brand: SparkFun
SKU: SF-SEN-30282
Price: 82.9 AUD
Availability: InStock

· MPN: SEN-30282

ESP32 & IoT Force & Flex Sensors SparkFun Qwiic Ecosystem

$82.90 |

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Build a connected weighing system without starting from low-level load cell code. OpenScale IoT is a wireless scale controller built around the ESP32-PICO-MI...

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Build a connected weighing system without starting from low-level load cell code. OpenScale IoT is a wireless scale controller built around the ESP32-PICO-MINI, designed to turn a standard load cell setup into a configurable, connected weigh scale.

Attach a four or five-wire load cell, or use four load sensors in a Wheatstone bridge arrangement, then configure calibration, sample rates and precision through a terminal menu. You can access it over Bluetooth/BLE, USB-C wired serial, or a serial port connection.

For connected projects, the board can join a local 2.4GHz WiFi network for live data viewing and Over-The-Air firmware updates. It also includes a Qwiic connector for solder-free I2C expansion, an onboard TMP102 temperature sensor, and a 3-pin screw terminal for an external one-wire temperature probe at the measurement site.

Documentation and design resources include a schematic, KiCad files, board dimensions, hookup guide, HX711 and TMP102 datasheets, firmware binaries and a GitHub repository.

Features:

Bluetooth & Wired Config: Connect via Bluetooth/BLE or a wired USB-C/serial connection to access the terminal menu at 115,200bps. Terminal configuration via Bluetooth is not supported on Apple devices.
WiFi Integration: Connect the board to your local 2.4GHz WiFi network to view your live data and perform Over-The-Air (OTA) firmware updates.
Qwiic Expansion: Easily add additional I2C sensors and displays to your project using the integrated Qwiic connector. No soldering required.
ESP32-PICO-MINI Module
2.4GHz WiFi, Bluetooth®, and Bluetooth LE supported
On-Chip PCB antenna
Serial configuration menu supported over wired and Bluetooth connections
Over-the-Air (OTA) firmware updates with WiFi connection
On Board & External Temperature Sensors
Fixed & Adjustable Gain

Specifications:

Operating Voltage: 5V
Operating Amperage: 80-100mA
Power Cycling: above 500ms
Selectable Output Data Rate: 10SPS or 80SPS

It is suited to long-running static load monitoring, DIY scales, beehive monitoring, conveyor applications, coffee measurement and other projects where ongoing weight and ambient temperature data are useful.

Jargon buster

Plain-language definitions for the technical terms used above.

2.4GHz WiFi: 2.4GHz WiFi is a common wireless networking band used by many routers and embedded devices, offering good range but more congestion than the 5GHz band. Devices on this band can join networks to transfer data or receive firmware updates.
BLE: BLE stands for Bluetooth Low Energy, a Bluetooth mode designed for low power use and broad compatibility with modern phones and computers. It connects well to battery-powered and mobile devices, including Apple hardware, though it behaves differently from Bluetooth Classic and its serial-style profiles.
ESP32: ESP32 is a family of low-cost microcontroller chips and modules from Espressif with built-in WiFi and Bluetooth. They support programmable firmware and over-the-air updates, and are commonly programmed with toolchains such as the Arduino core and ESP-IDF.
I2C: I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
IoT: Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
OTA: OTA means over-the-air updating, where a device's firmware is updated wirelessly rather than through a programming cable. This lets firmware be updated or maintained after a device is installed without a physical connection.
PCB antenna: A PCB antenna is an antenna pattern built directly into the circuit board rather than a separate metal antenna. It matters because placement, nearby metal and enclosure design can affect wireless range.
Qwiic: Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
USB-C: USB-C is a small, reversible USB connector that can carry power, data and, on some devices, video over a single cable. The same connector can range from charging only to high-speed data, so the functions a given port actually supports vary.