_SKU_SEN0214__20A电流传感器 - jimaobian/DFRobotWikiCn GitHub Wiki
简介
这款20A电流传感器模块采用ACS712霍尔电流感应芯片,具有量程大、简单易用、体积小巧、精度较高、无需焊接等特点,可用于直流电流和交流电流的测量。在设计上做了高压隔离,确保使用的安全性。模块输出的电压线性对应测量电流,且接口为Gravity 3P接口,即插即用。
该模块不建议在20A及以上的大电流情况下长时间工作。在测量高压电时,请注意安全。 |
产品参数
- 供电电压:+5.0V
- 测量范围:0 ~ ±20A DC, 0 ~ 17A(RMS) AC
- 测量容忍电压:220V AC,311V DC
- 相对误差:±3%
- 尺寸:39mm * 22mm *17mm
- 接口:Gravity PH2.0-3P
- 重量:18g
引脚说明
| | | | -------------------------------------------------------------- | | | | |
标号 | 名称 | 功能描述 |
1 | GND | GND |
2 | VCC | 5V电压输入 |
3 | 信号线 | 信号输出 |
4 | 测量电流输入+ | 测量电流输入端 |
5 | 测量电流输出- | 测量电流输出端 |
20A电流传感器引脚对应表
使用教程
本教程演示如何使用这款20A电流传感器。
准备
- 硬件
- Arduino UNO x1
- 20A电流传感器模块 x1
- Gravity PH2.0-3P接线 x1
- 杜邦线、导线 若干
- 软件
- Arduino IDE 版本1.6.8 点击下载Arduino IDE
接线图
样例代码
|
/***********************************************************
This sample code shows how to use 20A current sensor module.
Created 2016-4-26
By Bernie Chen <[email protected]>
GNU Lesser General Public License.
See <http://www.gnu.org/licenses/> for details.
All above must be included in any redistribution
****************************************************/
/***********Notice and Trouble shooting***************
1.Connection and Diagram can be found here, http://wiki.dfrobot.com.cn/index.php?title=(SKU:SEN0214)_20A%E7%94%B5%E6%B5%81%E4%BC%A0%E6%84%9F%E5%99%A8#.E6.A0.B7.E4.BE.8B.E4.BB.A3.E7.A0.81
2.This code is tested on Arduino Uno.
****************************************************/
const int currentSensorPin = A0; //define sensor pin
const int mVperAmp = 100; // use 185 for 5A Module, and 66 for 30A Module
float Vref = 0; //read your Vcc voltage,typical voltage should be 5000mV(5.0V)
void setup()
{
Serial.begin(115200);
Vref = readVref(); //read the reference votage(default:VCC)
}
void loop()
{
/*If you are reading DC current, use this function to read DC current. Then uncomment the AC function.*/
float CurrentValue = readDCCurrent(currentSensorPin);
/*If you are reading AC current, use this function to read AC current,it returns the RMS. Then uncomment the DC function.*/
//float CurrentValue = readACCurrent(currentSensorPin);
Serial.println(CurrentValue);
delay(500);
}
/*read DC Current Value*/
float readDCCurrent(int Pin)
{
int analogValueArray[31];
for(int index=0;index<31;index++)
{
analogValueArray[index]=analogRead(Pin);
}
int i,j,tempValue;
for (j = 0; j < 31 - 1; j ++)
{
for (i = 0; i < 31 - 1 - j; i ++)
{
if (analogValueArray[i] > analogValueArray[i + 1])
{
tempValue = analogValueArray[i];
analogValueArray[i] = analogValueArray[i + 1];
analogValueArray[i + 1] = tempValue;
}
}
}
float medianValue = analogValueArray[(31 - 1) / 2];
float DCCurrentValue = (medianValue / 1024.0 * Vref - Vref / 2.0) / mVperAmp; //Sensitivity:100mV/A, 0A @ Vcc/2
return DCCurrentValue;
}
/*read AC Current Value and return the RMS*/
float readACCurrent(int Pin)
{
int analogValue; //analog value read from the sensor output pin
int maxValue = 0; // store max value
int minValue = 1024; // store min value
unsigned long start_time = millis();
while((millis()-start_time) < 200) //sample for 0.2s
{
analogValue = analogRead(Pin);
if (analogValue > maxValue)
{
maxValue = analogValue;
}
if (analogValue < minValue)
{
minValue = analogValue;
}
}
float Vpp = (maxValue - minValue) * Vref / 1024.0;
float Vrms = Vpp / 2.0 * 0.707 / mVperAmp; //Vpp -> Vrms
return Vrms;
}
/*read reference voltage*/
long readVref()
{
long result;
#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega328__) || defined (__AVR_ATmega328P__)
ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
#elif defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) || defined(__AVR_AT90USB1286__)
ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
ADCSRB &= ~_BV(MUX5); // Without this the function always returns -1 on the ATmega2560 http://openenergymonitor.org/emon/node/2253#comment-11432
#elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
ADMUX = _BV(MUX5) | _BV(MUX0);
#elif defined (__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
ADMUX = _BV(MUX3) | _BV(MUX2);
#endif
#if defined(__AVR__)
delay(2); // Wait for Vref to settle
ADCSRA |= _BV(ADSC); // Convert
while (bit_is_set(ADCSRA, ADSC));
result = ADCL;
result |= ADCH << 8;
result = 1126400L / result; //1100mV*1024 ADC steps http://openenergymonitor.org/emon/node/1186
return result;
#elif defined(__arm__)
return (3300); //Arduino Due
#else
return (3300); //Guess that other un-supported architectures will be running a 3.3V!
#endif
}
|} 函数功能说明: float readDCCurrent(int Pin) ,该函数用来测量直流电流。 float readACCurrent(int Pin) ,该函数用来测量交流电流,测得的是交流电流的有效值。 根据被测电流,选择相应的函数调用即可,不能两个函数同时调用。
常见问题
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