SparkFUN NAU7802 24 位 ADC 秤重感測器模組 高精度 具備 QWIIC 接口

描述

SparkFUN NAU7802 24 位 ADC 秤重感測器模組 高精度 具備 QWIIC 接

SparkFUN NAU7802 24 位 ADC 秤重感測器模組 是 NAU7802 的小型分線板，可讓您輕鬆讀取稱重傳感器以準確測量物體的重量。通過將電路板連接到您的微控制器，您將能夠讀取稱重傳感器的電阻變化，並且通過一些校準，您將能夠獲得非常準確的重量測量值。這可以方便地創建您自己的工業規模、過程控製或簡單的存在檢測。使用我們方便的 Qwiic 系統，無需焊接即可將其連接到系統的其餘部分。但是，如果您更喜歡使用麵包板，我們仍然會斷開 0.1″ 間距的引腳。

通過將稱重傳感器連接到 Qwiic 秤，您將能夠將傳感器數據轉換為微控制器可以讀取的內容。NAU7802 是一款具有內置增益和 I ² C 輸出的 ADC，用於放大和轉換來自標準稱重傳感器的讀數。稱重傳感器基本上是一種將壓力或力轉換為電信號的裝置。在大多數情況下，這個信號非常小，需要放大。有許多流行的芯片可以讀取變化並將其放大，但 NAU7802 更進一步，將所有內容轉換為真正的 I ² C 輸出（連接到 Qwiic 連接器）。

該板提供一個四彈簧端子，無需焊接即可連接稱重傳感器。除了 I ² C 引腳外，該板還向板邊緣引出一個中斷引腳和 AVDD。差分輸入信號（加上第二組輸入信號）也被分解到電路板的中間。

注： NAU7802的 I ² C 地址為 0x2A，由硬件定義。需要多路復用器/Mux 才能與單個總線上的多個 NAU7802 傳感器通信。如果您需要使用多個 NAU7802 傳感器，請考慮使用 Qwiic Mux Breakout。

特色

• 工作電壓：3.3V（NAU7802：2.7V-5.5V）
• 24 位雙通道模數轉換器
• 可編程增益放大器
• 片上溫度傳感器
• 同時抑制 50Hz 和 60Hz
• 可編程 PGA 增益從 1 到 128
• 可編程 ADC 數據輸出速率
• 外部差分參考電壓範圍為 0.1V 至 5V
• 低功耗和可編程電源管理選項
  • <1uA 待機電流
• 2 個 Qwiic 連接器

文件與資源

• 原理圖
• 鷹檔案
• 聯播指南
• 數據表(NAU7802)
• 稱重傳感器入門
• SparkFun Qwiic 秤 NAU7802 Arduino 庫
• 硬件回購

SparkFun Qwiic Scale – NAU7802

The SparkFun Qwiic Scale is a small breakout board for the NAU7802 that allows you to easily read load cells to accurately measure the weight of an object. By connecting the board to your microcontroller you will be able to read the changes in the resistance of a load cell and, with some calibration, you’ll be able to get very accurate weight measurements. This can be handy for creating your own industrial scale, process control or simple presence detection. Utilizing our handy Qwiic system, no soldering is required to connect it to the rest of your system. However, we still have broken out 0.1″-spaced pins in case you prefer to use a breadboard.

By connecting a load cell to the Qwiic Scale you will be able to translate sensor data into something your microcontroller can read. The NAU7802 is an ADC with built in gain and I²C output to amplify and convert the readings from a standard load cell. A load cell is basically a device that translates pressure or force into electrical signals. In most cases this signal is very small and needs to be amplified. There are many popular chips that read the change and amplify it, but the NAU7802 goes one step further and converts everything to a true I²C output (attached to a Qwiic connector).

The board provides a four spring terminal to connect your load cell with no soldering required. In addition to the I²C pins, the board also breaks out an interrupt pin and AVDD to the edge of the board. The differential input signals (plus a second set of input signals) are broken out to the middle of the board, as well.

Note: The I²C address of the NAU7802 is 0x2A and is hardware defined. A multiplexer/Mux is required to communicate to multiple NAU7802 sensors on a single bus. If you need to use more than one NAU7802 sensor consider using the Qwiic Mux Breakout.

Features

• Operating Voltage: 3.3V (NAU7802: 2.7V-5.5V)
• 24-bit Dual-Channel Analog to Digital Converter
• Programmable Gain Amplifier
• On-chip temperature sensor
• Simultaneous 50Hz and 60Hz rejection
• Programmable PGA gains from 1 to 128
• Programmable aDC data output rates
• External differential reference voltage range from 0.1V to 5V
• Low Power Consumption and Programmable Power Management Options
  • <1uA standby current
• 2x Qwiic Connectors

DOCUMENTS

• Schematic
• EagleFiles
• Hookup Guide
• Datasheet (NAU7802)
• Getting Started with Load Cells
• SparkFun Qwiic Scale NAU7802 Arduino Library
• Hardware Repo