Hardware: Hive Interface Board 5

After a failed attempt at Hive Interface board version 0.4, work has begun on version 0.5.

Analog Devices AD7124-8 Eval Board connected to the Nordic nRF52840 Product Development Kit

A different approach from version 0.4 was taken. Evaluation boards and Preview Development Kits (PDK) were purchased.

• nRF52840 preview Development Kit

Goal

Create a low power, battery operated, wireless scale with extended communcation range using Bluetooth Low Energy version 5 (BLE5) with a high performance Analog to Digital Converter (ADC)

Features

• AD7124-8 24 bit ADC with 8 differential inputs

Provides independent channels for each of the 4 load cells or four scales with 4 loads cells in parallel.

• Bluetooth Low Energy (BLE) support

Uses the Nordic nRF52 32 bit ARM processor with GPIO lines and eight 16 bit ADC inputs.

• 40 pin header plug into a Pi.

The board can run from the Pi without the BMD301 as a replacement for the HX711

Data Sheets

AD7124-8 (pdf)

http://www.analog.com/en/design-center/design-tools-and-calculators/converter-tools.html