Description
Download Arduino Library
HLW8012 high-precision energy metering IC in Pakistan
HLW8012 is a single-phase multi-function metering chip that provides high-frequency pulse CF for energy metering, indicating active power, and high-frequency CF1 for indicating current RMS or voltage RMS
Chip pin
|
No. |
Pin name |
Types of |
description |
|
1 |
VDD |
power supply | 5V voltage |
|
2 |
V1P |
Analog input | Current Channel Differential Input, Maximum Differential Input Voltage Range ±43.75mV |
|
3 |
V1N |
Analog input | |
|
4 |
V2P |
Analog input | Voltage Channel Positive Input, Max Input Signal ±700mV |
|
5 |
GND |
Simulated ground | Simulated ground |
|
6 |
CF |
Digital output | Output active power high-frequency pulse, pulse duty cycle 50% |
|
7 |
CF1 |
Digital output | SEL=0, CF1 output current arms, pulse duty cycle 50% SEL=1; CF1 output voltage arms, pulse duty cycle 50% |
|
8 |
SEL |
Digital input | Configure CF1 output current or voltage arms, internal pull-down |
Chip features
High-frequency pulse CF, indicating active power, ±0.2% accuracy in 1000:1 range
High-frequency pulse CF1 can be configured as output current arms or voltage arms, achieving 0.5% accuracy over a 500:1 range
Built-in oscillator
Low power consumption, +5V single-supply operation, working power less than 15mW
SOP-8 package
Application:
Metering socket
Smart home electricity collector
Intelligent street light power collection end
The power quality monitoring system
Various types of energy metering systems
Internal block diagram
Sample code
#include
#define SERIAL_BAUDRATE 9600
// GPIOs
#define SEL_PIN 11
#define CF1_PIN 13
#define CF_PIN 12
// Check values every 2 seconds
#define UPDATE_TIME 2000
// Set SEL_PIN to HIGH to sample current
// This is the case for Itead’s Sonoff POW, where a
// the SEL_PIN drives a transistor that pulls down
// the SEL pin in the HLW8012 when closed
#define CURRENT_MODE HIGH
// These are the nominal values for the resistors in the circuit
#define CURRENT_RESISTOR 0.002
#define VOLTAGE_RESISTOR_UPSTREAM ( 5 * 470000 ) // Real: 2280k
#define VOLTAGE_RESISTOR_DOWNSTREAM ( 1000 ) // Real 1.009k
HLW8012 hlw8012;
void unblockingDelay(unsigned long mseconds) {
unsigned long timeout = millis();
while ((millis() – timeout) UPDATE_TIME) {
last = millis();
Serial.print(“[HLW] Active Power (W) : “); Serial.println(hlw8012.getActivePower());
Serial.print(“[HLW] Voltage (V) : “); Serial.println(hlw8012.getVoltage());
Serial.print(“[HLW] Current (A) : “); Serial.println(hlw8012.getCurrent());
Serial.print(“[HLW] Apparent Power (VA) : “); Serial.println(hlw8012.getApparentPower());
Serial.print(“[HLW] Power Factor (%) : “); Serial.println((int) (100 * hlw8012.getPowerFactor()));
Serial.println();
// When not using interrupts we have to manually switch to current or voltage monitor
// This means that every time we get into the conditional we only update one of them
// while the other will return the cached value.
hlw8012.toggleMode();
}
}
Reviews
There are no reviews yet.