Test_HVAC_Communication.ino
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/*
* https://github.com/Jeroen88/EasyOpenTherm
* https://www.tindie.com/products/Metriot/OpenTherm-adapter/
*
* Test_Boiler_Communication is a program to test if your MCU can communicate with your OpenTherm compatible HVAC
* Copyright (C) 2022 Jeroen Döll <info@metriot.nl>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* You need an OpenTherm controller that you can buy at my Tindie store, see <https://www.tindie.com/products/jeroen88/opentherm-controller/>
* Connect the two HVAC wires to the OpenTherm controller pins marked OT. The order is not important.
* Connect the OpenTherm controller to your microcontroller's power (3v3) and ground (GND) pins.
* Connect the OpenTherm TXD pin to the microcontroller's pin defined by #define OT_RX_PIN.
* Connect the OpenTherm RXD pin to the microcontroller's pin defined by #define OT_TX_PIN.
*/
#include <Arduino.h>
#include <EasyOpenTherm.h>
#define OT_RX_PIN (34)
#define OT_TX_PIN (17)
void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
Serial.println("\n\nStarted");
delay(5000);
}
void loop() {
// put your main code here, to run repeatedly:
static OpenTherm thermostat(OT_RX_PIN, OT_TX_PIN); // Create an OpenTherm thermostat (is primary device; HVAC is secondary device ) with OT_RX_PIN to receive data from HVAC and GPIO17 to send data to HVAC
// First try to connect to the HVAC to read it's capabilities. The HVAC returns an 8 bit secondaryFlags and each bit has a meaning. The bits are defined in enum class OpenTherm::HVAC_CONFIGURATION_FLAGS
// The secondaryMemberIDCode identifies the manufacturer of the HVAC
uint8_t secondaryFlags;
uint8_t secondaryMemberIDCode;
if(thermostat.read(OpenTherm::READ_DATA_ID::HVAC_SECONDARY_CONFIGURATION, secondaryFlags, secondaryMemberIDCode)) { // Mandatory support
Serial.println("Your setup is working! A frame was send to the HVAC and the HVAC responded with a valid frame.");
Serial.printf("Secondary configuration flags is 0x%02x, HVAC manufacturer's ID is %d (0x%02x).\n", secondaryFlags, secondaryMemberIDCode, secondaryMemberIDCode);
Serial.println("Here is the meanining of each bit in these flags:");
if(secondaryFlags & uint8_t(OpenTherm::HVAC_CONFIGURATION_FLAGS::SECONDARY_SYSTEM_TYPE)) Serial.println("HVAC system type set"); else Serial.println("HVAC system type cleared");
if(secondaryFlags & uint8_t(OpenTherm::HVAC_CONFIGURATION_FLAGS::SECONDARY_BYPASS)) Serial.println("HVAC bypass enabled"); else Serial.println("HVAC bypass disabled");
if(secondaryFlags & uint8_t(OpenTherm::HVAC_CONFIGURATION_FLAGS::SECONDARY_SPEED_CONTROL)) Serial.println("Speed control enabled"); else Serial.println("Speed control disabled");
} else {
secondaryFlags = 0;
if(thermostat.error() == OpenTherm::ERROR_CODES::UNKNOWN_DATA_ID) {
// Valid data is received but the for HVAC mandatory DATA-ID OpenTherm::READ_DATA_ID::HVAC_SECONDARY_CONFIGURATION is not recognised. This is not a HVAC but another device!
Serial.println("Your setup is working correctly but the remote device is not a HVAC.");
Serial.println("Look in EasyOpenTherm.h for the SECONDARY_CONFIGURATION or SOLAR_SECONDARY_CONFIGURATION\n DATA-ID and the corresponding primary and secondary flags.");
} else {
// No data or invalid data received
Serial.println("Your setup is not working yet. Please check:");
Serial.println("Is the OpenTherm controller connected to the HVAC using two wires? The order of the wires is not important.");
Serial.println("Is the OpenTherm controller correctly powered? The GND pin should be connected to the GND pin of the\n microcontroller and the 3v3 pin to the 3v3 pin of the microcontroller.");
Serial.printf("Is the OpenTherm controller TxD pin connected to the microcontroller's Rx pin as specified by\n #define OT_RX_PIN? Currently this pin is defined as %d.\n", OT_RX_PIN);
Serial.printf("Is the OpenTherm controller RxD pin connected to the microcontroller's Tx pin as specified by\n #define OT_TX_PIN? Currently this pin is defined as %d.\n", OT_TX_PIN);
Serial.printf("Is the microcontroller's Tx pin (currently pin %d} not an 'input only' pin?\n", OT_TX_PIN);
Serial.printf("Is in your software the OpenTherm object defined as OpenTherm thermostat(OT_RX_PIN, OT_TX_PIN);\n Currently this expands to OpenTherm thermostat(%d, %d);\n", OT_RX_PIN, OT_TX_PIN);
Serial.println("\n");
}
}
// Wait 5 secs and try again
delay(5000);
}