Version 02 of Relay
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@@ -1,105 +1,181 @@
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#include <Wire.h>
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#include <EEPROM.h>
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#define DEFAULT_ADDRESS 0x08
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#define MAX_NAME_LENGTH 24
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#define EEPROM_SIZE 64
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#define EEPROM_ADDR_LOC 0 // EEPROM location for I2C address
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#define EEPROM_NAME_LOC 1 // EEPROM location for device name
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#define DEVICE_NAME_LEN 24
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#define DEFAULT_I2C_ADDR 0x08 // Default I2C address
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// EEPROM Structure
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struct Config {
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uint8_t address;
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char deviceName[MAX_NAME_LENGTH+1];
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uint8_t relayStates;
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char deviceName[DEVICE_NAME_LEN] = "Relay";
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uint8_t i2cAddress = DEFAULT_I2C_ADDR;
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// I2C command codes
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enum Command : uint8_t {
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CMD_SET_ADDR = 0x01,
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CMD_SET_NAME = 0x02,
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};
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Config config;
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// --- RELAY FEATURE ADDITIONS ---
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const int relayPins[8] = {0, 1, 2, 3, 4, 5, 6, 7}; // GPIOs 0-7
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uint8_t relayStates[8] = {0}; // 0=OFF, 1=ON
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unsigned long relayTimers[8] = {0}; // millis() when to turn off, 0 = no timer
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void handleCommand(int numBytes);
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void saveConfig();
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void loadConfig();
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void emergencyStop();
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enum RelayCommand : uint8_t {
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CMD_RELAY_SET = 0x10, // [relay#][0|1] (relay# = 1..8)
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CMD_RELAY_ALL = 0x11, // [0|1]
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CMD_RELAY_TIMER = 0x12, // [relay#][ms_L][ms_H][ms_U][ms_T]
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CMD_RELAY_ALL_TIMER = 0x13 // [ms_L][ms_H][ms_U][ms_T]
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};
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// *** INVERTED RELAY LOGIC ***
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// User relay numbers: 1–8. Array indices: 0–7.
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void setRelay(uint8_t relayNum, uint8_t state) {
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if (relayNum >= 1 && relayNum <= 8) {
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uint8_t idx = relayNum - 1;
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relayStates[idx] = (state == 1 ? 1 : 0);
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// Inverted logic: LOW = ON, HIGH = OFF
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digitalWrite(relayPins[idx], relayStates[idx] ? LOW : HIGH);
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}
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}
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void setAllRelays(uint8_t state) {
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for (uint8_t i = 1; i <= 8; i++) setRelay(i, state);
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}
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// --- END RELAY FEATURE ADDITIONS ---
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void storeAddressToEEPROM(uint8_t addr) {
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EEPROM.write(EEPROM_ADDR_LOC, addr);
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EEPROM.commit();
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}
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uint8_t readAddressFromEEPROM() {
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uint8_t addr = EEPROM.read(EEPROM_ADDR_LOC);
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if (addr == 0xFF || addr == 0x00) {
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addr = DEFAULT_I2C_ADDR;
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storeAddressToEEPROM(addr);
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}
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return addr;
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}
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void storeNameToEEPROM(const char* name) {
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for (int i = 0; i < DEVICE_NAME_LEN; i++) {
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EEPROM.write(EEPROM_NAME_LOC + i, name[i]);
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if (name[i] == '\0') break;
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}
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EEPROM.commit();
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}
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void readNameFromEEPROM(char* name) {
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for (int i = 0; i < DEVICE_NAME_LEN; i++) {
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name[i] = EEPROM.read(EEPROM_NAME_LOC + i);
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if (name[i] == '\0') break;
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}
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name[DEVICE_NAME_LEN - 1] = '\0';
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}
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// Handle data received from master
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void onReceive(int len) {
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if (len < 1) return;
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uint8_t cmd = Wire.read();
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switch (cmd) {
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case CMD_SET_ADDR:
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if (Wire.available()) {
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uint8_t newAddr = Wire.read();
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if (newAddr > 0x00 && newAddr < 0x78) {
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storeAddressToEEPROM(newAddr);
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ESP.restart();
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}
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}
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break;
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case CMD_SET_NAME: {
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int i = 0;
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while (Wire.available() && i < DEVICE_NAME_LEN - 1) {
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deviceName[i++] = Wire.read();
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}
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deviceName[i] = '\0';
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storeNameToEEPROM(deviceName);
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break;
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}
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// --- RELAY FEATURE ADDITIONS ---
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case CMD_RELAY_SET:
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if (Wire.available() >= 2) {
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uint8_t relayNum = Wire.read(); // Now 1..8
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uint8_t state = Wire.read(); // 0|1
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setRelay(relayNum, state);
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if (relayNum >= 1 && relayNum <= 8) relayTimers[relayNum-1] = 0;
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}
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break;
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case CMD_RELAY_ALL:
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if (Wire.available() >= 1) {
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uint8_t state = Wire.read(); // 0|1
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setAllRelays(state);
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for (int i = 0; i < 8; i++) relayTimers[i] = 0;
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}
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break;
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case CMD_RELAY_TIMER:
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if (Wire.available() >= 5) {
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uint8_t relayNum = Wire.read(); // 1..8
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uint32_t ms = Wire.read();
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ms |= ((uint32_t)Wire.read()) << 8;
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ms |= ((uint32_t)Wire.read()) << 16;
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ms |= ((uint32_t)Wire.read()) << 24;
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setRelay(relayNum, 1);
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if (relayNum >= 1 && relayNum <= 8)
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relayTimers[relayNum-1] = millis() + ms;
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}
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break;
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case CMD_RELAY_ALL_TIMER:
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if (Wire.available() >= 4) {
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uint32_t ms = Wire.read();
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ms |= ((uint32_t)Wire.read()) << 8;
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ms |= ((uint32_t)Wire.read()) << 16;
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ms |= ((uint32_t)Wire.read()) << 24;
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setAllRelays(1);
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unsigned long offTime = millis() + ms;
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for (int i = 0; i < 8; i++) relayTimers[i] = offTime;
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}
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break;
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// --- END RELAY FEATURE ADDITIONS ---
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default:
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break;
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}
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}
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// Handle data requested by master
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void onRequest() {
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String response = String(i2cAddress, HEX) + ",GENERIC," + deviceName;
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Wire.write((const uint8_t*)response.c_str(), response.length());
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}
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void setup() {
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Serial.begin(115200);
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EEPROM.begin(sizeof(Config));
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loadConfig();
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// Initialize relays
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for(int i=0; i<8; i++) {
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EEPROM.begin(EEPROM_SIZE);
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i2cAddress = readAddressFromEEPROM();
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readNameFromEEPROM(deviceName);
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Wire.begin(i2cAddress);
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Wire.onReceive(onReceive);
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Wire.onRequest(onRequest);
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for (int i = 0; i < 8; i++) {
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pinMode(relayPins[i], OUTPUT);
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digitalWrite(relayPins[i], HIGH); // Active-low logic
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digitalWrite(relayPins[i], HIGH); // Inverted logic: HIGH = OFF at start
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}
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Wire.onReceive(handleCommand);
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Wire.onRequest([]() {
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String response = String(config.address) + ",8-relay," +
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config.deviceName + "," +
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String(config.relayStates, BIN);
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Wire.print(response);
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});
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Wire.begin((uint8_t)config.address);
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Serial.print("I2C Slave started at address 0x");
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Serial.println(i2cAddress, HEX);
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Serial.print("Device name: ");
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Serial.println(deviceName);
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}
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void loop() { /* Empty */ }
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void handleCommand(int numBytes) {
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uint8_t cmd = Wire.read();
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switch(cmd) {
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case 0xA0: // Set relay state
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if(numBytes == 3) {
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uint8_t relay = Wire.read();
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uint8_t state = Wire.read();
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if(relay < 8) {
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digitalWrite(relayPins[relay], state ? LOW : HIGH);
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bitWrite(config.relayStates, relay, state);
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}
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}
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break;
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case 0xB0: // Emergency stop
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emergencyStop();
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break;
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case 0xC0: // Set address
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if(numBytes == 2) {
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config.address = Wire.read();
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saveConfig();
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Wire.begin((uint8_t)config.address);
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}
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break;
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case 0xD0: // Set device name
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if(numBytes > 1) {
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uint8_t i = 0;
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while(Wire.available() && i < MAX_NAME_LENGTH) {
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config.deviceName[i++] = Wire.read();
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}
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config.deviceName[i] = '\0';
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saveConfig();
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}
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break;
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void loop() {
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unsigned long now = millis();
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for (int i = 0; i < 8; i++) {
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if (relayTimers[i] && now >= relayTimers[i]) {
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setRelay(i+1, 0); // Use relay number 1..8
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relayTimers[i] = 0;
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}
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}
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}
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void emergencyStop() {
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for(int i=0; i<8; i++) {
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digitalWrite(relayPins[i], HIGH);
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}
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config.relayStates = 0;
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}
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void loadConfig() {
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EEPROM.get(0, config);
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if(config.address < 0x08 || config.address > 0x77) {
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config.address = DEFAULT_ADDRESS;
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strcpy(config.deviceName, "8-Relay Module");
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saveConfig();
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}
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}
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void saveConfig() {
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EEPROM.put(0, config);
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EEPROM.commit();
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}
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