Arduino Pro Mini + current sensor GY-712 monitor the burnout of lamps
Hello. I want to share one of the projects created on the basis of Arduino.
For me, working with current sensors GY-712 was the first time. Before creating this project, a test block was created.
If you are already interested, then continue.
Here I will talk about one module, since it’s not very easy to describe and sketch 7 modules.
')
It was those task:
1) Lamps (lanterns) 50-65VT 220V recess or 24V constant;
2) Indication of the lamp (LED on the panel);
3) Sound indication of a burnt out lamp.
The decision was made as follows:
We use current sensor GY-712 5A
For reasons:
1) Measures AC and DC;
2) Easy to connect to the controller;
3) Compact;
4) Inexpensive when ordering from China.
Let's look at the scheme:
How the program works.
At start-up, it is checked whether the toggle switch is on, if you turn on a sound signal and a light indication, so that the sensor can be calibrated without load. If the toggle switch is turned off, the prog will give a sound + indication.
Next comes the calibration. After calibration - beep.
And the main program starts. Control of the toggle switch, if the control of the lamp load current is on, if the current is above a predetermined threshold, then turn on the indication. If there is no current, then turn off the display and give a sound signal.
Here is a simple diagram without a toggle switch control, just a light indication. This is in case someone just needs a load indicator light - but then you can simply wind the ferrite ring around the wire (make a current transformer) and connect the LED.
Photo tests:
Video test:
For me, working with current sensors GY-712 was the first time. Before creating this project, a test block was created.
If you are already interested, then continue.
Here I will talk about one module, since it’s not very easy to describe and sketch 7 modules.
')
It was those task:
1) Lamps (lanterns) 50-65VT 220V recess or 24V constant;
2) Indication of the lamp (LED on the panel);
3) Sound indication of a burnt out lamp.
The decision was made as follows:
We use current sensor GY-712 5A
For reasons:
1) Measures AC and DC;
2) Easy to connect to the controller;
3) Compact;
4) Inexpensive when ordering from China.
Let's look at the scheme:
How the program works.
At start-up, it is checked whether the toggle switch is on, if you turn on a sound signal and a light indication, so that the sensor can be calibrated without load. If the toggle switch is turned off, the prog will give a sound + indication.
Next comes the calibration. After calibration - beep.
And the main program starts. Control of the toggle switch, if the control of the lamp load current is on, if the current is above a predetermined threshold, then turn on the indication. If there is no current, then turn off the display and give a sound signal.
Here is a simple diagram without a toggle switch control, just a light indication. This is in case someone just needs a load indicator light - but then you can simply wind the ferrite ring around the wire (make a current transformer) and connect the LED.
Photo tests:
Video test:
A sample program for one module. IDE 1.5.2
float srab = 0.650;
const int currentPin1 = 0; // Analog input from current sensor
const unsigned long sampleTime = 100000UL; // sample over 100ms and 50Hz and 60Hz mains
const unsigned long numSamples = 250UL; // choose to keep up
const unsigned long sampleInterval = sampleTime / numSamples; // the sampling interval must be longer than ADC conversion time
// const int adc_zero = 512; // relative digital zero of the arudino input from ACS712 (could make it a variable and auto-adjust it)
int adc_zero1; // Auto Calibration Variable
float first;
void setup ()
{
pinMode (13, OUTPUT); // Pin indicator
pinMode (12, OUTPUT); // pin of sound
pinMode (2, INPUT); // pin input relay (switch)
digitalWrite (13, LOW);
digitalWrite (12, LOW);
while (digitalRead (2) == 0) {// If the toggle switch is on, then output a sound and light signal until it is turned off for calibration
tone (12,2000,500);
digitalWrite (13, HIGH);
delay (500);
digitalWrite (13, LOW);
delay (500);
}
tone (12,1500,100); // Sound Start Calibration
delay (180);
tone (12,1500,100);
delay (180);
tone (12,1500,100);
//Serial.begin(9600);
adc_zero1 = determineVQ (currentPin1); // Quiscent output voltage - ACS712 shows with no load (0 A)
digitalWrite (13, HIGH);
tone (12,1000,100);
delay (150);
digitalWrite (13, LOW);
}
void loop () {
// Serial.print ("ACS712 @ A2_1:"); Serial.print (readCurrent (currentPin1, adc_zero1), 3); Serial.println ("mA");
delay (300);
if (digitalRead (2) == 0) {// If the switch is on, then:
if (readCurrent (currentPin1, adc_zero1)> srab) // If the current is greater than the specified trigger threshold then:
{
digitalWrite (13, HIGH); // Enable indicator
}
else // Else
{
if (digitalRead (2) == 0) {// If the toggle switch is still on then:
digitalWrite (13, LOW); // Redeem Indicator
tone (12,2000,500); } // and beep
}
}
else {// Otherwise
digitalWrite (13, LOW); // // Redeem Indicator
}
// ------------------------------------------------ -------------------------------------------------- -----------------------------------------------
delay (250);
}
int determineVQ (int PIN) {
//Serial.print (ideestimating avg. Quiscent voltage: ");
long VQ = 0;
// read 5000 samples to stabilize value
for (int i = 0; i <5000; i ++) {
VQ + = analogRead (PIN);
delay (1); // depends on sampling (on filter capacitor), can be 1/80000 (80kHz) max.
}
Vq / = 5000;
//Serial.print(map (VQ, 0, 1023, 0, 5000)); Serial.println ("mV");
return int (VQ);
}
float readCurrent (int PIN, int adc_zero0)
{
unsigned long currentAcc = 0;
unsigned int count = 0;
unsigned long prevMicros = micros () - sampleInterval;
while (count <numSamples)
{
if (micros () - prevMicros> = sampleInterval)
{
int adc_raw = analogRead (PIN) - adc_zero0;
currentAcc + = (unsigned long) (adc_raw * adc_raw);
++ count;
prevMicros + = sampleInterval;
}
}
float rms = sqrt ((float) currentAcc / (float) numSamples) * (75.7576 / 1024.0);
return rms;
//Serial.println(rms);
}
const int currentPin1 = 0; // Analog input from current sensor
const unsigned long sampleTime = 100000UL; // sample over 100ms and 50Hz and 60Hz mains
const unsigned long numSamples = 250UL; // choose to keep up
const unsigned long sampleInterval = sampleTime / numSamples; // the sampling interval must be longer than ADC conversion time
// const int adc_zero = 512; // relative digital zero of the arudino input from ACS712 (could make it a variable and auto-adjust it)
int adc_zero1; // Auto Calibration Variable
float first;
void setup ()
{
pinMode (13, OUTPUT); // Pin indicator
pinMode (12, OUTPUT); // pin of sound
pinMode (2, INPUT); // pin input relay (switch)
digitalWrite (13, LOW);
digitalWrite (12, LOW);
while (digitalRead (2) == 0) {// If the toggle switch is on, then output a sound and light signal until it is turned off for calibration
tone (12,2000,500);
digitalWrite (13, HIGH);
delay (500);
digitalWrite (13, LOW);
delay (500);
}
tone (12,1500,100); // Sound Start Calibration
delay (180);
tone (12,1500,100);
delay (180);
tone (12,1500,100);
//Serial.begin(9600);
adc_zero1 = determineVQ (currentPin1); // Quiscent output voltage - ACS712 shows with no load (0 A)
digitalWrite (13, HIGH);
tone (12,1000,100);
delay (150);
digitalWrite (13, LOW);
}
void loop () {
// Serial.print ("ACS712 @ A2_1:"); Serial.print (readCurrent (currentPin1, adc_zero1), 3); Serial.println ("mA");
delay (300);
if (digitalRead (2) == 0) {// If the switch is on, then:
if (readCurrent (currentPin1, adc_zero1)> srab) // If the current is greater than the specified trigger threshold then:
{
digitalWrite (13, HIGH); // Enable indicator
}
else // Else
{
if (digitalRead (2) == 0) {// If the toggle switch is still on then:
digitalWrite (13, LOW); // Redeem Indicator
tone (12,2000,500); } // and beep
}
}
else {// Otherwise
digitalWrite (13, LOW); // // Redeem Indicator
}
// ------------------------------------------------ -------------------------------------------------- -----------------------------------------------
delay (250);
}
int determineVQ (int PIN) {
//Serial.print (ideestimating avg. Quiscent voltage: ");
long VQ = 0;
// read 5000 samples to stabilize value
for (int i = 0; i <5000; i ++) {
VQ + = analogRead (PIN);
delay (1); // depends on sampling (on filter capacitor), can be 1/80000 (80kHz) max.
}
Vq / = 5000;
//Serial.print(map (VQ, 0, 1023, 0, 5000)); Serial.println ("mV");
return int (VQ);
}
float readCurrent (int PIN, int adc_zero0)
{
unsigned long currentAcc = 0;
unsigned int count = 0;
unsigned long prevMicros = micros () - sampleInterval;
while (count <numSamples)
{
if (micros () - prevMicros> = sampleInterval)
{
int adc_raw = analogRead (PIN) - adc_zero0;
currentAcc + = (unsigned long) (adc_raw * adc_raw);
++ count;
prevMicros + = sampleInterval;
}
}
float rms = sqrt ((float) currentAcc / (float) numSamples) * (75.7576 / 1024.0);
return rms;
//Serial.println(rms);
}
Source: https://habr.com/ru/post/249811/
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