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ESPheatpump.ino
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ESPheatpump.ino
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////// Defines
#define HOST_NAME "heatpump"
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266HTTPClient.h>
HTTPClient http;
// Webserver
#include <ESPAsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include "index.h"
AsyncWebServer server(80);
// Cylinder temperature:
#include <OneWire.h>
#include <DallasTemperature.h>
float cyltemp = -99.99;
uint8_t cyltempint = 0;
uint8_t cyltempdec = 0;
OneWire oneWire(1);
DallasTemperature sensors(&oneWire);
// SSID and password
const char* ssid = "wifiSSID"; //your wifi ssid
const char* password = "wifiPass"; //your wifi password
//emon stuff
#define EMONAPI "xxx" //your emonpi write api
// Time
uint32_t mLastTime = 0;
uint32_t mTimeSeconds = 0;
//heartbeat leds
const long heartbeat = 2000; //blink the esp led this often
long blinktime = 0;
// heatpump status
byte POWER = 0;
byte CH = 0; //Central heating demand
byte DHW = 0; //DHW demand
int8_t OAT = 0; //outdoor air temp *2 to give 1/2 degree resolution
byte FROST = 0; //Frost protection active
byte DEFROST = 0; //Defrost cycle active
byte LOWTARRIF = 0; //Low tarrif mode //not yet implemented
byte NIGHTMODE = 0; //Night mode //not yet implemented
byte FAN = 0; //fan on
byte PUMP = 0; //circulating pump on
byte COMPRESSOR = 0; //compressor running
byte COMPOVERRUN = 0; //compressor overrun
int8_t CIRCWATERRETURN = 0; //Circulating water return temperature, 1degC
uint8_t COMPFREQ = 0; //Compressor operating frequency, 1Hz
int8_t DISCHARGTEMP = 0; //Refrigerant discharge temperature, 1degC
uint8_t POWERCONS = 0; //Power consumption, 100W
uint8_t FANSPEED = 0; //Fan speed, 10rpm
int8_t DEFRTEMP = 0; //Defrost temperature, 1degC
//int8_t OATREQ = 0; //Outside Air Temp, requested, 1degC. Probably not used
uint8_t PUMPSPEED = 0; //Water circulating pump rpm, 100rpm
int8_t SUCTIONTEMP = 0; //Refrigerant suction temperature, 1degC
int8_t CIRCWATERFLOW = 0; //Circulating water return temperature, 1degC
// http server handlers
uint8_t buttonpause = 0; //stop pressing buttons?
void notFound(AsyncWebServerRequest *request) {
request->send(404, "text/plain", "Not found");
}
void handleRoot(AsyncWebServerRequest *request) {
digitalWrite(LED_BUILTIN, 0);
request->send_P(200, "text/html", MAIN_page);
digitalWrite(LED_BUILTIN, 1);
}
void handledata(AsyncWebServerRequest *request) {
digitalWrite(LED_BUILTIN, 0);
String datastring = String(cyltempint) + "." + String(cyltempdec) + "#" + String(POWER) + "#" + String(CH) + "#" + String(DHW) + "#" + String(OAT) + "#" + String(FROST) + "#" + String(DEFROST) + "#" + String(LOWTARRIF) + "#" + String(NIGHTMODE) + "#" + String(FAN) + "#" + String(PUMP) + "#" + String(COMPRESSOR) + "#" + String(COMPOVERRUN) + "#" + String(CIRCWATERRETURN) + "#" + String(COMPFREQ) + "#" + String(DISCHARGTEMP) + "#" + String(POWERCONS) + "#" + String(FANSPEED) + "#" + String(DEFRTEMP) + "#" + String(PUMPSPEED) + "#" + String(SUCTIONTEMP) + "#" + String(CIRCWATERFLOW) + "#" + String(ESP.getFreeHeap());
request->send(200, "text/plain", datastring);
digitalWrite(LED_BUILTIN, 1);
}
void pausebuttons(AsyncWebServerRequest *request) {
digitalWrite(LED_BUILTIN, 0);
request->send(200, "text/plain", "Buttons paused");
buttonpause = 1;
digitalWrite(LED_BUILTIN, 1);
}
void resumebuttons(AsyncWebServerRequest *request) {
digitalWrite(LED_BUILTIN, 0);
request->send(200, "text/plain", "Buttons resumed");
buttonpause = 0;
digitalWrite(LED_BUILTIN, 1);
}
// Serial stuff
#define SERIAL_BAUD 1200
#define BYTE_PERIOD 18 //18ms between the start of each byte in a word
byte messagereceived[30] = {0};
unsigned long nextbyteexpectedby = 0;
uint8_t nextbytetoreceive = 0;
int8_t messagereceivelengthexpected = 0;
// button stuff
#define UP_BUTTON 16
#define DOWN_BUTTON 5
#define BACK_BUTTON 14
#define TICK_BUTTON 4
#define RELAY_U8 12
#define RELAY_U7 13
unsigned long buttondowntime = 0;
uint8_t buttondown = 0;
const unsigned long buttonpress = 75; //ms to press a button
const unsigned long buttonhold = 3500; //ms to hold a button
uint8_t tx_go = 0; //disable tx at start
uint8_t onreqscreen = 0;
int16_t lastrequestsent = 100;
int16_t lastrequestreceived = 0;
unsigned long requestsent = 0;
const unsigned long requesttimeout = 20000; //20secs should give enough time to manually press buttons for recovery
uint8_t responsereceived = 0;
int8_t requestincrement = 1;
unsigned long buttonwait = 15; //seconds before we start pressing buttons
void resetreceived() {
yield();
nextbytetoreceive = 0; //discard message so far
memset(messagereceived, 0, sizeof(messagereceived)); //clear variable
messagereceivelengthexpected = 0;
nextbyteexpectedby = 0;
}
void procmessagereceived() {
yield();
if (messagereceived[0] >= 5 && messagereceived[0] <=29) {
byte checksum = 0;
String message = "1: 0x";
for ( uint8_t i = 0; i < messagereceived[0]; i++) {
message += String(messagereceived[i], HEX);
message += ", ";
checksum += messagereceived[i];
}
message += "end";
if (checksum == 255) {
processword();
} else { //checksum error
resetreceived();
}
} else { //word is too long or too short to be correct
resetreceived();
}
}
void processword() { //anything getting this far has already been verified as a word - correct length and checksum
yield();
String url;
switch (messagereceived[3]) { //4th byte is message type
case 152:
//0x98 - Day/Time and power/demands back from the ASHP
POWER = bitRead(messagereceived[8], 0);
DHW = bitRead(messagereceived[9], 0);
CH = bitRead(messagereceived[8], 2);
url = "http://emonpi/input/post?node=heatpump&fulljson={%22hppowerstat%22:" + String(POWER) + ",%22dhw%22:" + String(DHW) + ",%22CH%22:" + String(CH) + "}&apikey=" + EMONAPI;
break;
case 153:
//0x99 - Request from the remote to the ASHP
lastrequestsent = messagereceived[5];
break;
case 154:
//0x9A - From the ASHP, contains various data
lastrequestreceived = messagereceived[5];
responsereceived = 1;
switch (messagereceived[5]) {
case 100:
CIRCWATERRETURN = messagereceived[7];
url = "http://emonpi/input/post?node=heatpump&fulljson={%22circwaterreturn%22:" + String(CIRCWATERRETURN) + "}&apikey=" + EMONAPI;
break;
case 101:
COMPFREQ = messagereceived[7];
url = "http://emonpi/input/post?node=heatpump&fulljson={%22compfreq%22:" + String(COMPFREQ) + "}&apikey=" + EMONAPI;
break;
case 102:
DISCHARGTEMP = messagereceived[7];
url = "http://emonpi/input/post?node=heatpump&fulljson={%22refrdischarge%22:" + String(DISCHARGTEMP) + "}&apikey=" + EMONAPI;
break;
case 103:
POWERCONS = messagereceived[7];
url = "http://emonpi/input/post?node=heatpump&fulljson={%22cpowercons%22:" + String(POWERCONS) + "}&apikey=" + EMONAPI;
break;
case 104:
FANSPEED = messagereceived[7];
url = "http://emonpi/input/post?node=heatpump&fulljson={%22fanspeed%22:" + String(FANSPEED) + "}&apikey=" + EMONAPI;
break;
case 105:
DEFRTEMP = messagereceived[7];
url = "http://emonpi/input/post?node=heatpump&fulljson={%22defrtemp%22:" + String(DEFRTEMP) + "}&apikey=" + EMONAPI;
break;
// case 106:
// OATREQ = wordreceived[7]; //ignore, we don't use this
// break;
case 107:
PUMPSPEED = messagereceived[7];
url = "http://emonpi/input/post?node=heatpump&fulljson={%22pumpspeed%22:" + String(PUMPSPEED) + "}&apikey=" + EMONAPI;
break;
case 108:
SUCTIONTEMP = messagereceived[7];
url = "http://emonpi/input/post?node=heatpump&fulljson={%22refrsuction%22:" + String(SUCTIONTEMP) + "}&apikey=" + EMONAPI;
break;
case 109:
CIRCWATERFLOW = messagereceived[7];
url = "http://emonpi/input/post?node=heatpump&fulljson={%22circwaterflow%22:" + String(CIRCWATERFLOW) + "}&apikey=" + EMONAPI;
break;
}
break;
case 156:
//0x9C - From the ASHP, contains the outside air temp and pump, fan and compressor status
OAT = messagereceived[6];
PUMP = bitRead(messagereceived[8], 5);
FAN = bitRead(messagereceived[8], 4);
COMPRESSOR = bitRead(messagereceived[8], 6); //FAN and COMP may need swapping?
COMPOVERRUN = bitRead(messagereceived[8], 7);
url = "http://emonpi/input/post?node=heatpump&fulljson={%22oat%22:" + String(OAT) + ",%22pump%22:" + String(PUMP) + ",%22fan%22:" + String(FAN) + ",%22compressor%22:" + String(COMPRESSOR) + ",%22overrun%22:" + String(COMPOVERRUN) + "}&apikey=" + EMONAPI;
break;
// case 8: //0x08 - 'OK' status from the ASHP?
// case 9: //0x09 - Ack from the remote?
// case 151: //0x97 - Day/Time and power from the remote
// case 161: //0xA1 - Unknown, but from the remote
// case 163: //0xA3 - Also unknown from the remote, but the 5th byte appears to increment periodically
default:
break;
}
http.begin(url.c_str());
http.GET();
http.end();
resetreceived();
}
void pressButton(uint8_t pinnum, uint16_t presslength) {
digitalWrite(LED_BUILTIN, LOW);
if (buttonpause == 0) { //stop pressing stuff if we're paused
digitalWrite(pinnum, HIGH);
for (uint8_t i = 0; i < presslength / 75; i++) {
yield();
delay(75);
}
digitalWrite(pinnum, LOW);
digitalWrite(LED_BUILTIN, HIGH);
yield();
delay(75);
}
}
////// Setup
void setup() {
// Initialize the Serial (for heatpump comms)
Serial.begin(SERIAL_BAUD); //comms with ashp
//GPIO 1 (TX) swap the pin to a GPIO.
pinMode(1, FUNCTION_3);
//init pins
pinMode(UP_BUTTON, OUTPUT);
pinMode(DOWN_BUTTON, OUTPUT);
pinMode(BACK_BUTTON, OUTPUT);
pinMode(TICK_BUTTON, OUTPUT);
digitalWrite(UP_BUTTON, LOW);
digitalWrite(DOWN_BUTTON, LOW);
digitalWrite(BACK_BUTTON, LOW);
digitalWrite(TICK_BUTTON, LOW);
// Builtin leds of ESP
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, LOW);
// WiFi connection
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(100);
digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
}
digitalWrite(LED_BUILTIN, HIGH);
// Register host name in WiFi and mDNS
String hostNameWifi = HOST_NAME;
hostNameWifi.concat(".local");
WiFi.hostname(hostNameWifi);
server.on("/", handleRoot);
server.on("/pause", pausebuttons);
server.on("/resume", resumebuttons);
server.on("/readdata", handledata);
server.onNotFound(handleRoot);
server.begin();
// temp sensor
digitalWrite(LED_BUILTIN, LOW);
sensors.begin();
sensors.requestTemperatures(); //get first temperature reading
sensors.setWaitForConversion(false); // makes it async
digitalWrite(LED_BUILTIN, HIGH);
// End of setup
// Check if we've just reset, or if it's a full system boot.
// It's more likely that the esp has reset, than the whole system has rebooted.
// We can check this by sending a single request, and seeing if we get anything back.
// So, send a TICK, wait a bit, and see if we've had a response back.
// If we have, the esp has just reset, and we can continue with requests. (tx_go = 1)
// If not, its a system boot, so we wait. (tx_go = 0)
//
// Send a tick...
lastrequestsent = 0;
responsereceived = 0;
pressButton(TICK_BUTTON, buttonpress);
requestsent = millis();
uint8_t waiting = 1;
//wait for a response
while(waiting == 1) {
if ((millis() - requestsent) >= requesttimeout) { //waiting too long, must be a full system boot
waiting = 0; //stop waiting
tx_go = 0; //wait until we start requests
onreqscreen = 0; //not on request screen
}
else if ( responsereceived == 1 && lastrequestsent == lastrequestreceived ) { //we've received a response to a request, and wait until we get what we asked for - slow down a bit!
waiting = 0; //stop waiting
tx_go = 1; //just an esp reset, so continue requests
onreqscreen = 1; //as above
}
//handle serial
//read
if (Serial.available() >= 1) { //something had come in
nextbyteexpectedby = millis();
messagereceived[nextbytetoreceive] = Serial.read();
yield();
if (nextbytetoreceive == 0) { //first byte is message length
messagereceivelengthexpected = messagereceived[0];
if (messagereceived[0] == 0) {
resetreceived();
} else if (messagereceived[0] > 25) {
resetreceived();
}
}
nextbytetoreceive++;
if (nextbytetoreceive == messagereceivelengthexpected) { //word complete
//process message here
procmessagereceived();
}
}
if (nextbytetoreceive < messagereceivelengthexpected) { //word incomplete
if (millis() - nextbyteexpectedby > BYTE_PERIOD + 4 ) { //but no more bytes received in time, then word corrupted or incomplete (plus 4ms 'buffer')
resetreceived();
}
}
}
}
void loop()
{
//led heartbeat
if (millis() > blinktime + heartbeat) {
digitalWrite(LED_BUILTIN, 0);
blinktime = millis();
}
else if (millis() > blinktime + 20) {
digitalWrite(LED_BUILTIN, 1);
}
if (tx_go == 1) { //we can request data
if (onreqscreen == 0) { //but we're not yet on the request screen
pressButton(BACK_BUTTON, buttonhold);
delay(500);
pressButton(TICK_BUTTON, buttonpress);
lastrequestsent = 0;
responsereceived = 0;
requestsent = millis();
onreqscreen = 1;
} else { //we are on the request screen
if ((millis() - requestsent) >= requesttimeout) { //waiting too long, send another request
if ( lastrequestsent == 0 ) { //this should not be zero - we've sent a request
// We might be on the time/day setting screen - hold the tick button to exit.
// Doing that may take us _into_ the setting screen, but we'll come out the next time around.
pressButton(TICK_BUTTON, buttonhold);
onreqscreen = 0; //try again
} else {
pressButton(TICK_BUTTON, buttonpress);
lastrequestsent = 0;
responsereceived = 0;
requestsent = millis();
}
} else if ( responsereceived == 1 && lastrequestsent == lastrequestreceived ) { //we've received a response to a request, and wait until we get what we asked for - slow down a bit!
responsereceived = 0;
if ( lastrequestreceived >= 150 ) { //ie, 50 or above on the screen (including 98, 99 etc if we've gone below 00)
requestincrement = 1; //go up
} else if ( lastrequestreceived >= 109 ) { // 09 or over on the screen
requestincrement = 0; //go down
} else if ( lastrequestreceived == 100 ) { // 00 on the screen
requestincrement = 1; //go up
}
if ( requestincrement == 1 ) { // go up
pressButton(UP_BUTTON, buttonpress);
} else { //go down
pressButton(DOWN_BUTTON, buttonpress);
}
pressButton(TICK_BUTTON, buttonpress);
lastrequestsent = 0;
responsereceived = 0;
requestsent = millis();
}
}
}
//handle serial
//read
if (Serial.available() >= 1) { //something had come in
nextbyteexpectedby = millis();
messagereceived[nextbytetoreceive] = Serial.read();
yield();
if (nextbytetoreceive == 0) { //first byte is message length
messagereceivelengthexpected = messagereceived[0];
if (messagereceived[0] == 0) {
resetreceived();
} else if (messagereceived[0] > 25) {
resetreceived();
}
}
nextbytetoreceive++;
if (nextbytetoreceive == messagereceivelengthexpected) { //word complete
//process message here
procmessagereceived();
}
}
if (nextbytetoreceive < messagereceivelengthexpected) { //word incomplete
if (millis() - nextbyteexpectedby > BYTE_PERIOD + 4 ) { //but no more bytes received in time, then word corrupted or incomplete (plus 4ms 'buffer')
resetreceived();
}
}
// Each second
if ((millis() - mLastTime) >= 1000) {
// Time
mLastTime = millis();
mTimeSeconds++;
yield();
if (mTimeSeconds % 5 == 0) { // Each 5 seconds
// Cylinder temp
cyltemp = sensors.getTempCByIndex(0);
sensors.requestTemperatures();
if (cyltemp < 70.0 && cyltemp >= 0.0) { //don't send erroneous data
cyltempint = int(cyltemp);
cyltempdec = int(cyltemp * 10) - 10 * cyltempint;
String url = "http://emonpi/input/post?node=heatpump&fulljson={%22cyltemp%22:" + String(cyltempint) + "." + String(cyltempdec) + "}&apikey=" + EMONAPI;
http.begin(url.c_str());
http.GET();
http.end();
}
}
if ((mTimeSeconds > buttonwait) && (tx_go == 0)) {
tx_go = 1;
}
}
// Give a time for ESP
yield();
}
/////////// End