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small sketch to receive modbus data from epever solar charger in json over serial. support for two rs485 connections.
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/*tracerRegisters
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This program is based off of RS485_HalfDuplex.ino found at
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https://github.com/4-20ma/ModbusMaster/blob/master/examples/RS485_HalfDuplex/RS485_HalfDuplex.ino
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RS485_HalfDuplex.pde - example using ModbusMaster library to communicate
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with EPSolar LS2024B controller using a half-duplex RS485 transceiver.
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This example is tested against an EPSolar LS2024B solar charge controller.
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See here for protocol specs:
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http://www.solar-elektro.cz/data/dokumenty/1733_modbus_protocol.pdf
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Library:: ModbusMaster
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Author:: Marius Kintel <marius at kintel dot net>
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Copyright:: 2009-2016 Doc Walker
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Modified:: 2023 DeltaLima
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Notes: I took the register stuff from https://github.com/Bettapro/Solar-Tracer-Blynk-V3
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Had to hack around e.g. the battOverallCurrent as I only got garbage
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when using the method from Bettapro.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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We're using a MAX485-compatible RS485 Transceiver.
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In order to allow for Modbus communication and serial communication with the Arduino Uno,
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we're using software serial.Rx/Tx is hooked up to the software serial port at RX=10 & TX=11.
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The Data Enable and Receiver Enable pins are hooked up at DE = 3 & RE = 2.
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Wiring
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MAX485=>Arduino Uno
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GND => GND
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VCC => 5V
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DI => 11
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DE => 3
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RE => 2
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RO => 10
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TRACER => MAX485
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blue => B
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green => A
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*/
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//#include <TracerRegisters.h> // empty library for potential future use
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#include <ModbusMaster.h>
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#include <SoftwareSerial.h>
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#include "ArduinoJson.h"
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SoftwareSerial myserial(10, 11); // RX, TX
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#define MAX485_DE 3
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#define MAX485_RE_NEG 2
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// instantiate ModbusMaster object
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ModbusMaster node;
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// not needed...
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//float batVolt;
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//float batPercentage = 0.0;
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float battChargeCurrent, battDischargeCurrent, battChargePower;
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float bvoltage, ctemp, btemp, bremaining, lpower, lcurrent, pvvoltage, pvcurrent, pvpower;
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float stats_today_pv_volt_min, stats_today_pv_volt_max;
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uint16_t battOverallCurrent_raw;
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int16_t battOverallCurrent_war;
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float battOverallCurrent;
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bool rs485DataReceived = true;
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bool loadPoweredOn = true;
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uint8_t result;
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uint16_t data[6];
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int outputValue1 = 0;
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int countIt = 0;
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void preTransmission()
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{
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digitalWrite(MAX485_RE_NEG, 1);
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digitalWrite(MAX485_DE, 1);
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}
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void postTransmission()
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{
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digitalWrite(MAX485_RE_NEG, 0);
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digitalWrite(MAX485_DE, 0);
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}
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void setup()
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{
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pinMode(MAX485_RE_NEG, OUTPUT);
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pinMode(MAX485_DE, OUTPUT);
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// Init in receive mode
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digitalWrite(MAX485_RE_NEG, 0);
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digitalWrite(MAX485_DE, 0);
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// Modbus communication runs at 115200 baud
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//Tracer connection
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myserial.begin(115200);
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//USB Serial connection
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Serial.begin(115200);
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// Modbus slave ID 1
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node.begin(1, myserial);
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// Callbacks allow us to configure the RS485 transceiver correctly
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node.preTransmission(preTransmission);
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node.postTransmission(postTransmission);
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}
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//was true
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bool state = true;
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void loop()
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{
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// uint8_t is short hand for a byte or an integer of length 8 bits
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AddressRegistry_3100();
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AddressRegistry_3106();
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AddressRegistry_310D();
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AddressRegistry_311A();
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AddressRegistry_331B();
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StaticJsonDocument<128> jsonOut;
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jsonOut["pvpower"] = pvpower;
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jsonOut["pvcurrent"] = pvcurrent;
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jsonOut["pvvoltage"] = pvvoltage;
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jsonOut["lcurrent"] = lcurrent;
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jsonOut["pvpower"] = pvpower;
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jsonOut["lpower"] = lpower;
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jsonOut["pvpower"] = pvpower;
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jsonOut["btemp"] = btemp;
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jsonOut["bvoltage"] = bvoltage;
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jsonOut["bremaining"] = bremaining;
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jsonOut["ctemp"] = ctemp;
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jsonOut["battChargeCurrent"] = battChargeCurrent;
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jsonOut["battChargePower"] = battChargePower;
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jsonOut["battOverallCurrent"] = battOverallCurrent;
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jsonOut["loadPoweredOn"] = loadPoweredOn;
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serializeJson(jsonOut, Serial);
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Serial.println();
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delay(1000);
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}
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// AddressRegistry from esp8266_max485_simple
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void AddressRegistry_3100() {
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result = node.readInputRegisters(0x3100, 6);
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if (result == node.ku8MBSuccess) {
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pvvoltage = node.getResponseBuffer(0x00) / 100.0f;
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//Serial.print("PV Voltage: ");
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//Serial.println(pvvoltage);
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pvcurrent = node.getResponseBuffer(0x01) / 100.0f;
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//Serial.print("PV Current: ");
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//Serial.println(pvcurrent);
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pvpower = (node.getResponseBuffer(0x02) | node.getResponseBuffer(0x03) << 16) / 100.0f;
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//Serial.print("PV Power: ");
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//Serial.println(pvpower);
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bvoltage = node.getResponseBuffer(0x04) / 100.0f;
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//Serial.print("Battery Voltage: ");
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//Serial.println(bvoltage);
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battChargeCurrent = node.getResponseBuffer(0x05) / 100.0f;
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//Serial.print("Battery Charge Current: ");
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//Serial.println(battChargeCurrent);
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}
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}
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void AddressRegistry_3106()
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{
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result = node.readInputRegisters(0x3106, 2);
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if (result == node.ku8MBSuccess) {
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battChargePower = (node.getResponseBuffer(0x00) | node.getResponseBuffer(0x01) << 16) / 100.0f;
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//Serial.print("Battery Charge Power: ");
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//Serial.println(battChargePower);
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}
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}
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void AddressRegistry_310D()
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{
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result = node.readInputRegisters(0x310D, 3);
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if (result == node.ku8MBSuccess) {
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lcurrent = node.getResponseBuffer(0x00) / 100.0f;
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//Serial.print("Load Current: ");
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//Serial.println(lcurrent);
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lpower = (node.getResponseBuffer(0x01) | node.getResponseBuffer(0x02) << 16) / 100.0f;
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//Serial.print("Load Power: ");
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//Serial.println(lpower);
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} else {
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rs485DataReceived = false;
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//Serial.println("Read register 0x310D failed!");
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}
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}
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void AddressRegistry_311A() {
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result = node.readInputRegisters(0x311A, 2);
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if (result == node.ku8MBSuccess) {
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bremaining = node.getResponseBuffer(0x00) / 1.0f;
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//Serial.print("Battery Remaining %: ");
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//Serial.println(bremaining);
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btemp = node.getResponseBuffer(0x01) / 100.0f;
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//Serial.print("Battery Temperature: ");
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//Serial.println(btemp);
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} else {
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rs485DataReceived = false;
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//Serial.println("Read register 0x311A failed!");
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}
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}
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void AddressRegistry_331B() {
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result = node.readInputRegisters(0x331B, 2);
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if (result == node.ku8MBSuccess) {
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//battOverallCurrent = (node.getResponseBuffer(0x00)| node.getResponseBuffer(0x01) << 16) / 100.0f;
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// idk why this works not with arduino. with esp8266 it worked
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//battOverallCurrent_war = *((int16_t *)&battOverallCurrent_raw);
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//battOverallCurrent = 0.001 * battOverallCurrent_war;
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battOverallCurrent = (battChargeCurrent - lcurrent);
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Serial.print("Battery Discharge Current: ");
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Serial.println(battOverallCurrent);
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} else {
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rs485DataReceived = false;
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//Serial.println("Read register 0x331B failed!");
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}
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}
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