Arduino 模擬讀取4～20ma 電流感測器並顯示於 1602 液晶螢幕

由台灣智能感測科技產品展示與導覽 4-20mA, 信號產生器, 感測器, 電流產生器, 電流轉換電壓

工業用感測器領域有很多是用 4-20mA 來呈現數據。所以本段影片我們使用簡單的 Arduino 搭配 4-20mA 信號發生器與電流轉電壓模組 4-20mA 轉 0-5V 這兩個模組來實驗。本實驗可以應用於未來實際接觸到 4-20mA 類型的感測器的數據讀取與應用。

所需材料:

1. 電流轉電壓模組 4-20mA 轉 0-5V 是將電流信號傳輸末端，將信號轉換成電壓信號供單片機檢測。商品連結
2. 4-20mA 信號發生器商品連結

接線方式

步驟與項目

針對電流產生器的部分

信號輸出兩線轉接到電流轉電壓模組

以上兩個模組採共用電源 9-24V 皆可.

接線到 Arduino 的腳位

Vout 接 A0
此外 Arduino UNO 的 GND 腳位與電流轉電壓模組共地

// include the library code:
#include <LiquidCrystal.h>
int Min = 0;    // This is the Min reading of the sensor
int Max = 1023; // This is the Max reading of the sensor
float Desired_Min = 4.0; // this is the desired number that you want converted with min reading of the sensor
float Desired_Max = 20.0; // this is the desired number that you want converted with max reading of the sensor
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
void setup() {
lcd.begin(16, 2);              // start the library
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
}
// the loop routine runs over and over again forever:
void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
float voltage = sensorValue * (5.0 / 1023.0);
float Readings = mapf(sensorValue, Min , Max, Desired_Min, Desired_Max);
// print out the value you read:
Serial.print(voltage);
Serial.print("v / Raw:");
Serial.print(sensorValue);
lcd.setCursor(0,0);
lcd.print("4-20mA"); // LCD 標題
lcd.setCursor(9,0);
lcd.print(char(61)); // 印出 = 的字元
char mAvalue[28];
dtostrf(Readings, 4, 1, mAvalue);
Serial.print(" MA:");
Serial.println(mAvalue);
lcd.print (mAvalue);
lcd.print ("mA");
lcd.setCursor(0,1);            // move cursor to second line "1" and 9 spaces over
lcd.print(voltage); lcd.print(F("v / "));
char buffer [8]; // a few bytes larger than your LCD line
uint16_t raw = sensorValue; // data read from instrument
sprintf (buffer, "RAW:%04u", raw); // send data to the buffer
lcd.print (buffer); // display line on buffer
delay(1000);
}
double mapf(double val, double in_min, double in_max, double out_min, double out_max) {
return (val - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

// include the library code:

#include <LiquidCrystal.h>

int Min = 0; // This is the Min reading of the sensor

int Max = 1023; // This is the Max reading of the sensor

float Desired_Min = 4.0; // this is the desired number that you want converted with min reading of the sensor

float Desired_Max = 20.0; // this is the desired number that you want converted with max reading of the sensor

// initialize the library with the numbers of the interface pins

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

void setup() {

lcd.begin(16, 2); // start the library

// initialize serial communication at 9600 bits per second:

Serial.begin(9600);

}

// the loop routine runs over and over again forever:

void loop() {

// read the input on analog pin 0:

int sensorValue = analogRead(A0);

// Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):

float voltage = sensorValue * (5.0 / 1023.0);

float Readings = mapf(sensorValue, Min , Max, Desired_Min, Desired_Max);

// print out the value you read:

Serial.print(voltage);

Serial.print("v / Raw:");

Serial.print(sensorValue);

lcd.setCursor(0,0);

lcd.print("4-20mA"); // LCD 標題

lcd.setCursor(9,0);

lcd.print(char(61)); // 印出 = 的字元

char mAvalue[28];

dtostrf(Readings, 4, 1, mAvalue);

Serial.print(" MA:");

Serial.println(mAvalue);

lcd.print (mAvalue);

lcd.print ("mA");

lcd.setCursor(0,1); // move cursor to second line "1" and 9 spaces over

lcd.print(voltage); lcd.print(F("v / "));

char buffer [8]; // a few bytes larger than your LCD line

uint16_t raw = sensorValue; // data read from instrument

sprintf (buffer, "RAW:%04u", raw); // send data to the buffer

lcd.print (buffer); // display line on buffer

delay(1000);

}

double mapf(double val, double in_min, double in_max, double out_min, double out_max) {

return (val - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;

}

Arduino 模擬讀取4～20ma 電流感測器並顯示於 1602 液晶螢幕