资料介绍
Table of Contents
EVAL-CN0398-ARDZ Shield Overview
CN0398 is a single supply, low power, high precision complete solution for soil moisture and pH measurements, including temperature compensation. The circuit is optimized for use with capacitive soil moisture sensors that are insensitive to water salinity and do not corrode over time. The circuit also measures soil pH and that function is suitable in a variety of applications.
The system is divided into three independent measurement front ends: pH, soil moisture, and temperature. After signal conditioning, the three channels share an AD7124-8, 24-bit sigma-delta (Σ-Δ) ADC. The AD7124-8, is a low power, low noise, completely integrated analog front end for high precision measurement applications. The device contains a low noise, 24-bit Σ-Δ analog-to-digital converter (ADC), and can be configured to have 8 differential inputs or 15 single-ended or pseudo-differential inputs. The on-chip gain stage ensures that signals of small amplitude can be interfaced directly to the ADC. The AD7124-8 uses the ADR3433,a low cost, low power, high precision CMOS voltage reference, featuring ±0.1% initial accuracy, low operating current, and low output noise. The ADR3433 provides both the 3.3 V reference and also the AVDD supply to the AD7124-8. The ADP7118-2.5 is a CMOS, low dropout (LDO) linear regulator which provides the power supply for the moisture sensor. The input to the ADP7118-2.5 is selectable via the jumper P10 as either 5 V or 7 V to 12 V coming from the Arduino-compatible platform board. The output of the ADP7118-2.5 is also selectable as 3.3 V or 5 V using the jumper on P8. The circuit uses the ADA4661-2, precision op amp to buffer the high impedance pH probe output and to drive the ADC. The ADA4661-2 is a dual, precision, rail-to-rail input/output amplifier optimized for low power, high bandwidth, and wide operating supply voltage range.
Equipment
- EVAL-CN0398-ARDZ Evaluation Board
- EVAL-ADICUP360 Base Board
- PC with a USB port and Windows 7 (32-bit) or higher
- Serial Terminal Software (Putty/TeraTerm or similar)
- 7 V to 12 V/1 A dc power supply, or equivalent 7 V to 12 V/1 A bench supply
- 3-wire moisture sensor
- pH sensor
- PT100 RTD
General Setup
- The EVAL-CN0398-ARDZ (CN0398 Shield board) connects to EVAL-ADICUP360 base board
- Power the system through the EVAL-ADICUP360 using external wall wart (7V-12V)
- Connect the system to the PC using USB cable
- Connect the sensors to the dedicated connectors
Test Setup Functional Block Diagram
Connectors and Jumper Configurations
Chip Select
The chip select is configurable to be routed to 3 general purpose I/O pins of the board, digital pins 8, 9 and 10, allowing multiple boards using SPI communications protocol to be stacked up.
As default, shunt is placed across pins 1 and 2 of connector P5 of EVAL-CN0398-ARDZ shield board which associates to the used of GPIO pin 10 of EVAL-ADICUP360.
Moisture Sensor Connector (P2)
Moisture Sensor Power Supply Jumper Selection
If the moisture sensor requires a 5V power supply place the jumper as seen on the image below
If the moisture sensor requires a 3.3V power supply, place the jumper as seen on the image below
RTD Connector (P1)
Possible RTD Configuration
pH Probe Connector (J1)
The EVAL-CN0398-ARDZ shield board comes with a BNC connector J1 for pH sensors as shown on the image below
The output of the pH sensor is bipolar and gives a maximum signal of ±414 mV at 25°C. The AD7124-8 operates from a single power supply therefore the pH probe should be biased above ground so that it is within the acceptable common-mode range of the AD7124-8. One of the integrated features of the AD7124-8 is its internal bias voltage generator that sets the common mode voltage of a channel to AVDD/2, or 1.65 V. This bias voltage from the ADC is applied to the pH probe shield and sets the output of the sensor 1.65 V ±414 mV at 25°C. For information about pH calibration, visit CN0398 Circuit Note.
Schematic, PCB Layout, Bill of Materials
EVAL-CN0398-ARDZ Design & Integration Files
- Schematics
- PCB Layout
- Bill of Materials
- Allegro Project
Software
End of Document
- CN0398设计与集成文件
- UG-1656:将EVAL-ADT7420ARDZ屏蔽与Arduino或Lduino硬件配合使用
- EVAL-CN0338-ARDZ屏蔽
- EVAL-CN0391-ARDZ屏蔽
- EVAL-CN0394-ARDZ屏蔽
- EVAL-CN0395-ARDZ屏蔽
- EVAL-CN0397-ARDZ屏蔽
- EVL-CN0357 ARDZ设计与集成文件
- EVL-CN0216 ARDZ设计与集成文件
- EVAL-AD8302-ARDZ-评估软件
- CN0398 Design & Integration Files
- CN0398 Design & Integration Files
- EVAL-ADT7420ARDZ - Schematic
- EVAL-AD8302-ARDZ - Evaluation Software
- 基于EVAL-CN0357-ARDZ流量表的参考设计
- PI电磁屏蔽材料的屏蔽机理和影响因素 1923次阅读
- 线缆屏蔽材料的种类及应用 1010次阅读
- 屏蔽线为什么使用双绞线 屏蔽线应该怎样接地 9318次阅读
- 屏蔽双绞线和非屏蔽双绞线的主要差异是什么 1.4w次阅读
- 各种屏蔽体的屏蔽效能计算方法解析 2.4w次阅读
- 如何计算屏蔽体的屏蔽效能 6527次阅读
- 屏蔽罩常用于哪些电路? 8454次阅读
- 什么是屏蔽线_屏蔽线的类型_屏蔽线的作用 1.9w次阅读
- 屏蔽线和非屏蔽线的区别_网线屏蔽线和非屏蔽线的区别 5.6w次阅读
- 屏蔽水晶头和非屏蔽的区别 6w次阅读
- 屏蔽线缆在EMC屏蔽方面的参数特性 2.7w次阅读
- 关于电磁场的屏蔽问题,如何屏蔽 2.2w次阅读
- 电磁屏蔽的基本原则 6344次阅读
- 非屏蔽双绞线和屏蔽双绞线有什么区别 4.5w次阅读
- 静电屏蔽、静磁屏蔽和高频电磁场屏蔽知识 9920次阅读
下载排行
本周
- 1电子电路原理第七版PDF电子教材免费下载
- 0.00 MB | 1491次下载 | 免费
- 2单片机典型实例介绍
- 18.19 MB | 95次下载 | 1 积分
- 3S7-200PLC编程实例详细资料
- 1.17 MB | 27次下载 | 1 积分
- 4笔记本电脑主板的元件识别和讲解说明
- 4.28 MB | 18次下载 | 4 积分
- 5开关电源原理及各功能电路详解
- 0.38 MB | 11次下载 | 免费
- 6100W短波放大电路图
- 0.05 MB | 4次下载 | 3 积分
- 7基于单片机和 SG3525的程控开关电源设计
- 0.23 MB | 4次下载 | 免费
- 8基于AT89C2051/4051单片机编程器的实验
- 0.11 MB | 4次下载 | 免费
本月
- 1OrCAD10.5下载OrCAD10.5中文版软件
- 0.00 MB | 234313次下载 | 免费
- 2PADS 9.0 2009最新版 -下载
- 0.00 MB | 66304次下载 | 免费
- 3protel99下载protel99软件下载(中文版)
- 0.00 MB | 51209次下载 | 免费
- 4LabView 8.0 专业版下载 (3CD完整版)
- 0.00 MB | 51043次下载 | 免费
- 5555集成电路应用800例(新编版)
- 0.00 MB | 33562次下载 | 免费
- 6接口电路图大全
- 未知 | 30320次下载 | 免费
- 7Multisim 10下载Multisim 10 中文版
- 0.00 MB | 28588次下载 | 免费
- 8开关电源设计实例指南
- 未知 | 21539次下载 | 免费
总榜
- 1matlab软件下载入口
- 未知 | 935053次下载 | 免费
- 2protel99se软件下载(可英文版转中文版)
- 78.1 MB | 537793次下载 | 免费
- 3MATLAB 7.1 下载 (含软件介绍)
- 未知 | 420026次下载 | 免费
- 4OrCAD10.5下载OrCAD10.5中文版软件
- 0.00 MB | 234313次下载 | 免费
- 5Altium DXP2002下载入口
- 未知 | 233046次下载 | 免费
- 6电路仿真软件multisim 10.0免费下载
- 340992 | 191183次下载 | 免费
- 7十天学会AVR单片机与C语言视频教程 下载
- 158M | 183277次下载 | 免费
- 8proe5.0野火版下载(中文版免费下载)
- 未知 | 138039次下载 | 免费
评论
查看更多