let your own RS485 AC energy meter work with Tuya app, so that can remote monitor meter data by Tuya app via internet.
arduino source code donwload:
Tuya_AdapterV2_RS485_Energy_Meter.zip (Size: 2.41 KB / Downloads: 580)
Code:
#include <ModbusMaster.h>
#include <Arduino.h>
#include <TuyaWifi.h>
#include "HardwareSerial.h"
//---------RS485 setting
#define DEBUG 1
#define SERIAL_BAUD 9600
#define RX_PIN 32
#define TX_PIN 33
#define SERIAL_NUM 2
#define SLAVE_ADDR 225
//#define READ_ADDR 0
#define READ_NUM 2
uint8_t raw_vcp_data[8] = {0};
uint16_t total_energy = 0;
uint16_t READ_ADDR = 0;
const static uint16_t addr_start_arr[6] = {
0,100,106,118,142,144,
};
const static String emeter_name_arr[6] = {
"Total active energy",
"Voltage",
"Current",
"Active power",
"Power factor",
"Grid frequency",
};
typedef struct
{
float total_active_energy;
float voltage;
float current;
float active_power;
float power_factor;
float grid_freq;
}EMETER_STR;
typedef union
{
EMETER_STR emeter_str;
float emeter_arr[6];
}EMETER_UNION;
/* Current device DP values */
EMETER_UNION emeter_union = {0};
HardwareSerial My485Serial(SERIAL_NUM);
ModbusMaster node;
uint16_t rcv_buf[READ_NUM] = {0};
uint16_t conv_buf[READ_NUM] = {0};
static int16_t cnt_read = 0;
static void ReadEmeterRegs(void)
{
uint32_t read_tmp = 0;
READ_ADDR = addr_start_arr[cnt_read];
uint8_t result = node.readHoldingRegisters(READ_ADDR, READ_NUM);
if (result == node.ku8MBSuccess) {//if communicate successful then
for (uint8_t j = 0; j < READ_NUM; j++)
{
rcv_buf[j] = node.getResponseBuffer(j);
}
conv_buf[1] = rcv_buf[0];
conv_buf[0] = rcv_buf[1];
emeter_union.emeter_arr[cnt_read] = *(float*)&conv_buf[0];
switch(cnt_read)
{
case 0:total_energy = emeter_union.emeter_arr[cnt_read] * 10;break;
case 1:
read_tmp = emeter_union.emeter_arr[cnt_read] * 10;
raw_vcp_data[0] = (read_tmp &0xff00)>>8;
raw_vcp_data[1] = (read_tmp &0x0ff);
break;
case 2:
read_tmp = emeter_union.emeter_arr[cnt_read] * 1000;
raw_vcp_data[2] = (read_tmp &0x0ff0000)>>16;
raw_vcp_data[3] = (read_tmp &0x0ff00)>>8;
raw_vcp_data[4] = read_tmp &0x0ff;
break;
case 3:
read_tmp = emeter_union.emeter_arr[cnt_read] * 1000;
raw_vcp_data[5] = (read_tmp &0x0ff0000)>>16;
raw_vcp_data[6] = (read_tmp &0x0ff00)>>8;
raw_vcp_data[7] = read_tmp &0x0ff;
break;
default:break;
}
#if DEBUG
Serial1.print(emeter_name_arr[cnt_read]);
Serial1.print(":<HEX 0x");
Serial1.print(rcv_buf[0],HEX);
Serial1.print(" ");
Serial1.print(rcv_buf[1],HEX);
Serial1.print(" FVALUE ");
Serial1.print(emeter_union.emeter_arr[cnt_read]);
Serial1.println("> ");
#endif
cnt_read++;
if(cnt_read>=4) cnt_read = 0;
}
else
{
node.clearResponseBuffer();
}
}
//---RS485 setting end----
TuyaWifi my_device;
/* Current LED status */
unsigned char led_state = 0;
/* Connect network button pin */
int key_pin = 25;
/* Data point define */
typedef enum
{
DPID_TOTAL_ENERGY = 1,
//DPID_VOLTAGE,
//DPID_CURRENT,
//DPID_ACTIVE_POWER,
DPID_VCP = 6,
//DPID_POWER_FACTOR,
//DPID_GRID_FREQ,
}EMETER_DPID_DEF;
#define LED_WiFi 26
//#define LED_User 33
/* Stores all DPs and their types. PS: array[][0]:dpid, array[][1]:dp type.
* dp type(TuyaDefs.h) : DP_TYPE_RAW, DP_TYPE_BOOL, DP_TYPE_VALUE, DP_TYPE_STRING, DP_TYPE_ENUM, DP_TYPE_BITMAP
*/
unsigned char dp_array[][2] =
{
{DPID_TOTAL_ENERGY, DP_TYPE_VALUE},
{DPID_VCP, DP_TYPE_RAW},
};
unsigned char pid[] = {"gl3gvyksva54unam"}; ////change pid here....
unsigned char mcu_ver[] = {"1.0.0"};
/* last time */
unsigned long last_time = 0;
void setup()
{
My485Serial.begin(SERIAL_BAUD, SERIAL_8E1, RX_PIN, TX_PIN); //RS485 serial port
node.begin(SLAVE_ADDR,My485Serial);
Serial.begin(9600,SERIAL_8N1,22,19); //Tuya module serial port
Serial1.begin(115200,SERIAL_8N1,3,1); //USB serial port
// Serial with tuyawifi
//Initialize led port, turn off led.
pinMode(LED_WiFi, OUTPUT);
digitalWrite(LED_WiFi, LOW);
/* pinMode(LED_User, OUTPUT);
digitalWrite(LED_User, LOW);*/
//Initialize networking keys.
pinMode(key_pin, INPUT_PULLUP);
//Enter the PID and MCU software version
my_device.init(pid, mcu_ver);
//incoming all DPs and their types array, DP numbers
my_device.set_dp_cmd_total(dp_array, 2);
//register DP download processing callback function
my_device.dp_process_func_register(dp_process);
//register upload all DP callback function
my_device.dp_update_all_func_register(dp_update_all);
//delay(300);
last_time = millis();
}
void loop()
{
ReadEmeterRegs(); // read RS485 sensor
my_device.uart_service();
//Enter the connection network mode when Pin7 is pressed.
if (digitalRead(key_pin) == LOW) {
delay(80);
if (digitalRead(key_pin) == LOW) {
my_device.mcu_set_wifi_mode(SMART_CONFIG);
}
}
/* LED blinks when network is being connected */
if ((my_device.mcu_get_wifi_work_state() != WIFI_LOW_POWER) && (my_device.mcu_get_wifi_work_state() != WIFI_CONN_CLOUD) && (my_device.mcu_get_wifi_work_state() != WIFI_SATE_UNKNOW)) {
if (millis()- last_time >= 500) {
last_time = millis();
if (led_state == LOW) {
led_state = HIGH;
} else {
led_state = LOW;
}
digitalWrite(LED_WiFi, led_state);
}
}
/* report the temperature and humidity */
if ((my_device.mcu_get_wifi_work_state() == WIFI_CONNECTED) ||
(my_device.mcu_get_wifi_work_state() == WIFI_CONN_CLOUD)) {
dp_update_all();
}
delay(1000);
}
/**
* @description: DP download callback function.
* @param {unsigned char} dpid
* @param {const unsigned char} value
* @param {unsigned short} length
* @return {unsigned char}
*/
unsigned char dp_process(unsigned char dpid,const unsigned char value[], unsigned short length)
{
/* all DP only report */
return TY_SUCCESS;
}
/**
* @description: Upload all DP status of the current device.
* @param {*}
* @return {*}
*/
void dp_update_all(void)
{
my_device.mcu_dp_update((unsigned char)DPID_TOTAL_ENERGY, total_energy, 1);
my_device.mcu_dp_update((unsigned char)DPID_VCP, raw_vcp_data, 8);
}
