Hardware

I would like to step up 3.3V from my power supply with the help of a dc-dc-boost converter to 5V and then I want to draw 500mA by placing a 10 Ohm resistor between the output-pin of the boost-converter and ground.

@skywatch great, thanks a lot for your suggestion. A bit of research on the internet educated me about these diodes :D looks like they already exist on the board that carries the relay. However, i deeply thank you for the info. This forum and internet in general is such a powerful tool :+1: @ejlane your concern is fully justified :+1: i also come from an engineering background and i like to think "worse case scenario". The more one look the more one find that the very vast majority or microwave ovens work the same way : there are 3 industrial switches built in the door lock. 2 of them are cabled on the "power side", one is for signaling ("software side"). So we are pretty safe on that matter. But you are so right about safety. Magnetron do emitt dangerous waves and capacitors and stuff packed in the oven can be deadly because of high voltage. Thanks both for suggestions. I will come back with updated sketches and beg for advice once more ;)

@NeoX I use a Nano, Ethernet, LCD display, and GPS for an NTP server on my isolated network to provide the time for [suspect] cameras. #define VER 12.2 bool debug = false; // must be true to have debug statements go to serial /* NTP Time Server: Modified by Gregg Ferry using softwareserial instead of Serial1 using GY-GPS6MV2 This code is in the public domain. ver 12 time server gets time from Arduino clock instead of from gps */ #define enableEthernet false #define enableGPS true #define enableDisplay true #define minimizeSerialTraffic true #if enableEthernet // ethernet #include <SPI.h> // needed for Arduino versions later than 0018 #include <Ethernet.h> #include <EthernetUdp.h> // UDP library from: bjoern@cs.stanford.edu 12/30/2008 // Time Server MAC address byte mac[] = {0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF }; // NTP Server public IP Address IPAddress ip(192, 168, 2, 130); // Time Server Port #define NTP_PORT 123 unsigned int localPort = 123; static const int NTP_PACKET_SIZE = 48; // buffers for receiving and sending data byte packetBuffer[NTP_PACKET_SIZE]; // An Ethernet UDP instance EthernetUDP Udp; int packetSize; // NTP since 1900/01/01 //#include <PGMWrap.h> //const uint8_t daysInMonth [] PROGMEM = { 31,28,31,30,31,30,31,31,30,31,30,31 }; //const or compiler complains const uint8_t daysInMonth [] = { 31,28,31,30,31,30,31,31,30,31,30,31 }; //const or compiler complains const unsigned long seventyYears = 2208988800UL; // to convert unix time to epoch #endif #if enableGPS // GPS #include <TinyGPS++.h> //GPS instance TinyGPSPlus tinyGPS; #include <NeoSWSerial.h> //#include <SoftwareSerial.h> #define rxPin 5 #define txPin 4 NeoSWSerial GPSSerial(rxPin, txPin); // CONNECT BT RX PIN TO ARDUINO txPin | CONNECT BT TX PIN TO ARDUINO rxPin char incharBefore=255; char inchar=255; #endif #if enableDisplay // Display #include "SSD1306Ascii.h" #include "SSD1306AsciiAvrI2c.h" #define I2C_ADDRESS 0x3C SSD1306AsciiAvrI2c oled; #endif bool TimeHasBeenSet = false; bool firstPass = true; //Time #include <Timezone.h> //#include "Time.h" TimeChangeRule myDST = {"PDT", Second, Sun, Mar, 2, -420}; // Daylight time = UTC - 7 hours TimeChangeRule mySTD = {"PST", First, Sun, Nov, 2, -480}; // Standard time = UTC - 8 hours Timezone myTZ(myDST, mySTD); TimeChangeRule *tcr; // pointer to the time change rule, use to get TZ abbrev time_t local; String timeString = "hh:mm:ss"; String dateString = "yyyy MMM dd"; const String localDaysOfWeek[] = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday" }; const String localMonthsOfYear[] = {"JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"}; uint8_t localDayOfWeek; uint8_t previousHour = 0; uint8_t previousMinute = 0; uint8_t previousSecond = 0; unsigned long timestamp1970; //-----------------------------------------------------------------------------------printTimes void printTimes(){ Serial.print(F("GPS ")); Serial.print(tinyGPS.date.year());Serial.print(F("/")); Serial.print(tinyGPS.date.month());Serial.print(F("/")); Serial.print(tinyGPS.date.day());Serial.print(F(" ")); Serial.print(tinyGPS.time.hour());Serial.print(F(":")); Serial.print(tinyGPS.time.minute());Serial.print(F(":")); Serial.println(tinyGPS.time.second()); Serial.print(F("UTC ")); Serial.print(year());Serial.print(F("/")); Serial.print(month());Serial.print(F("/")); Serial.print(day());Serial.print(F(" ")); Serial.print(hour());Serial.print(F(":")); Serial.print(minute());Serial.print(F(":")); Serial.println(second()); Serial.print(F("local ")); Serial.print(year(local));Serial.print(F("/")); Serial.print(month(local));Serial.print(F("/")); Serial.print(day(local));Serial.print(F(" ")); Serial.print(hour(local));Serial.print(F(":")); Serial.print(minute(local));Serial.print(F(":")); Serial.println(second(local)); Serial.print(F(" ")); Serial.print(dateString);Serial.print(F(" ")); Serial.println(timeString); } //-----------------------------------------------------------------------------------setTimeAndDateStrings void setTimeAndDateStrings(){ local = myTZ.toLocal(now(), &tcr); // two days ago -172800 char buf[32]; sprintf(buf, "%.2d:%.2d:%.2d",hour(local), minute(local), second(local)); timeString = String(buf); // char m[4]; // temporary storage for month string (DateStrings.cpp uses shared buffer) // strcpy(m, monthShortStr(month(local))); // sprintf(buf, "%.2d %s %d",day(local), m, year(local)); // dateString = String(buf); sprintf(buf, "%.2d ",day(local)); dateString = String(buf); dateString += localMonthsOfYear[month(local)-1]; sprintf(buf," %d",year(local)); dateString += String(buf); localDayOfWeek = weekday(local)-1; } #if enableGPS //-----------------------------------------------------------------------------------getgps static bool getgps() { // and update arduino time if (GPSSerial.available()==0) return false; // while (GPSSerial.available()) { incharBefore = inchar; inchar = GPSSerial.read(); tinyGPS.encode(inchar); if (!TimeHasBeenSet) Serial.print(inchar); // } if ((inchar != 10) || (incharBefore != 13)) return false; // make sure to full NMEA statement was received inchar = 0; incharBefore = 0; // NMEA statement received, reset terminators if(tinyGPS.time.isValid()){ /* * setTime( tinyGPS.time.hour(), tinyGPS.time.minute(), tinyGPS.time.second(), tinyGPS.date.day(), tinyGPS.date.month(), tinyGPS.date.year() ); */ int hh=tinyGPS.time.hour(); int mm=tinyGPS.time.minute(); int ss=tinyGPS.time.second(); int DD=tinyGPS.date.day(); int MM=tinyGPS.date.month(); int YY=tinyGPS.date.year(); setTime(hh,mm,ss,DD,MM,YY); local = myTZ.toLocal(now(), &tcr); //get the local time setTimeAndDateStrings(); if (!TimeHasBeenSet) printTimes(); TimeHasBeenSet = true; return true; } else { return false; } } #endif #if enableDisplay //-----------------------------------------------------------------------------------displayGPStimeSetTheTime void displayGPStimeSetTheTime(bool TimeSetByGPS){ oled.setCursor(0,0); // Start at top-left corner if (TimeSetByGPS) oled.print(F(" ")); else oled.print(F("!")); } //-----------------------------------------------------------------------------------displayAwaitingGPS void displayAwaitingGPS() { oled.clear(); oled.setCursor(0,0); // Start at top-left corner oled.println(F("NTP Server")); oled.println(F(" Awating")); oled.println(F(" GPS Lock ")); Serial.println(F(" Awating GPS Lock ")); } //-----------------------------------------------------------------------------------displayNewDay void displayNewDay(){ previousHour = hour(local); previousMinute= minute(local); previousSecond = second(local); oled.clear(); oled.setCursor(12,0); // center time string oled.print(timeString); uint8_t s = (10-localDaysOfWeek[localDayOfWeek].length())*6; oled.setCursor(s,3); oled.print(localDaysOfWeek[localDayOfWeek]); oled.setCursor(0,6); oled.print(dateString); } //-----------------------------------------------------------------------------------displayTime void displayTime(){ // digital clock display of the time if ((second(local)==0 && minute(local)==0 && hour(local)==0) || firstPass){ // new day firstPass = false; displayNewDay(); } else { if (hour(local) != previousHour){ previousHour = hour(local); oled.setCursor(12,0); oled.print(timeString); } else { if (minute(local) != previousMinute){ previousMinute= minute(local); oled.setCursor(48,0); oled.print(timeString.substring(3)); } else { if (second(local) != previousSecond){ previousSecond = second(local); oled.setCursor(84,0); oled.print(timeString.substring(6)); } } } } } // send to serial monitor #else void displayGPStimeSetTheTime(bool TimeSetByGPS){ } void displayAwaitingGPS() { Serial.println(F(" Awating GPS Lock ")); } void displayTime(){ #if !minimizeSerialTraffic Serial.println(); printTimes(); #endif } #endif //-----------------------------------------------------------------------------------setup #if enableEthernet void setupEthernet(){ // start the Ethernet and UDP: Ethernet.begin(mac,ip); Udp.begin(localPort); Serial.print(Ethernet.localIP()); Serial.print(F(" "));Serial.println(NTP_PORT); } #endif #if enableGPS void setupGPS(){ GPSSerial.begin(9600); // start GPS module UART // Disable everything but $GPRMC // Note the following sentences are for UBLOX NEO6MV2 GPS GPSSerial.write("$PUBX,40,GLL,0,0,0,0,0,0*5C\r\n"); GPSSerial.write("$PUBX,40,VTG,0,0,0,0,0,0*5E\r\n"); GPSSerial.write("$PUBX,40,GSV,0,0,0,0,0,0*59\r\n"); GPSSerial.write("$PUBX,40,GGA,0,0,0,0,0,0*5A\r\n"); GPSSerial.write("$PUBX,40,GSA,0,0,0,0,0,0*4E\r\n"); } #endif #if enableDisplay void setupDisplay(){ oled.begin(&Adafruit128x64, I2C_ADDRESS); oled.setFont(System5x7); oled.set2X(); } #endif void setup() { Serial.begin(115200); Serial.print("NTP Server with display version ");Serial.println(VER); #if enableDisplay setupDisplay(); #endif displayAwaitingGPS(); #if enableEthernet setupEthernet(); #endif #if enableGPS setupGPS(); #endif } //-----------------------------------------------------------------------------------loop void loop() { /* while (Serial.available()){ char inChar = Serial.read(); if (inChar == 'd' || inChar == 'D') { debug = !debug; if (debug) Serial.println(F("debug is ON"));else Serial.println(F("debug is off")); } } */ #if enableGPS if (getgps()){ if(TimeHasBeenSet) displayTime(); } #endif #if enableEthernet // if there's data available, read a packet packetSize = Udp.parsePacket(); if(packetSize) processNTP(); #endif } #if enableEthernet //-----------------------------------------------------------------------------------numberOfSecondsSince1900Epoch unsigned long int numberOfSecondsSince1900Epoch(uint16_t y, uint8_t m, uint8_t d, uint8_t h, uint8_t mm, uint8_t s) { if (y >= 1970) y -= 1970; uint16_t daysLocal = d; for (uint8_t i = 1; i < m; ++i) daysLocal += daysInMonth[i - 1]; // for (uint8_t i = 1; i < m; ++i) // daysLocal += pgm_read_byte(daysInMonth + i - 1); if (m > 2 && y % 4 == 0) ++daysLocal; daysLocal += 365 * y + (y + 3) / 4 - 1; return daysLocal*24L*3600L + h*3600L + mm*60L + s + seventyYears; } //-----------------------------------------------------------------------------------processNTP void processNTP() { Udp.read(packetBuffer,NTP_PACKET_SIZE); IPAddress Remote = Udp.remoteIP(); int PortNum = Udp.remotePort(); /* if (debug) { Serial.println(); Serial.print("Received UDP packet size "); Serial.println(packetSize); Serial.print("From "); for (int i =0; i < 4; i++) { Serial.print(Remote[i], DEC); if (i < 3) { Serial.print("."); } } Serial.print(", port "); Serial.print(PortNum); byte LIVNMODE = packetBuffer[0]; Serial.print(" LI, Vers, Mode :"); Serial.print(packetBuffer[0],HEX); byte STRATUM = packetBuffer[1]; Serial.print(" Stratum :"); Serial.print(packetBuffer[1],HEX); byte POLLING = packetBuffer[2]; Serial.print(" Polling :"); Serial.print(packetBuffer[2],HEX); byte PRECISION = packetBuffer[3]; Serial.print(" Precision :"); Serial.println(packetBuffer[3],HEX); for (int z = 0; z < NTP_PACKET_SIZE; z++) { Serial.print(packetBuffer[z],HEX); if (((z+1) % 4) == 0) { Serial.println(); } } Serial.println(); } // end of debug statements */ packetBuffer[0] = 0b00100100; // LI, Version, Mode packetBuffer[1] = 1 ; // stratum packetBuffer[2] = 6 ; // polling minimum packetBuffer[3] = 0xFA; // precision packetBuffer[7] = 0; // root delay packetBuffer[8] = 0; packetBuffer[9] = 8; packetBuffer[10] = 0; packetBuffer[11] = 0; // root dispersion packetBuffer[12] = 0; packetBuffer[13] = 0xC; packetBuffer[14] = 0; /* uint16_t y=year(); uint8_t m=month(); uint8_t d=day(); uint8_t h=hour(); uint8_t mm=minute(); uint8_t s=second(); if (y >= 1970) y -= 1970; uint16_t daysLocal = d; for (uint8_t i = 1; i < m; ++i) daysLocal += daysInMonth[i - 1]; if (m > 2 && y % 4 == 0) ++daysLocal; daysLocal += 365 * y + (y + 3) / 4 - 1; timestamp1970 = daysLocal*24L*3600L + h*3600L + mm*60L + s + seventyYears; */ // uint16_t utcYY=year(); // uint8_t utcMM=month(); // uint8_t utcDD=day(); // uint8_t utchh=hour(); // uint8_t utcmm=minute(); // uint8_t utcss=second(); // timestamp1970 = numberOfSecondsSince1900Epoch(utcYY,utcMM,utcDD,utchh,utcmm,utcss); // timestamp1970 = numberOfSecondsSince1900Epoch(2022,4,30,10,10,10); timestamp1970 = numberOfSecondsSince1900Epoch(year(),month(),day(),hour(),minute(),second()); /* * timestamp1970 = numberOfSecondsSince1900Epoch( tinyGPS.date.year(), tinyGPS.date.month(), tinyGPS.date.day(), tinyGPS.time.hour(), tinyGPS.time.minute(), tinyGPS.time.second() ); */ unsigned long tempval = timestamp1970; packetBuffer[12] = 71; //"G"; packetBuffer[13] = 80; //"P"; packetBuffer[14] = 83; //"S"; packetBuffer[15] = 0; //"0"; // reference timestamp1970 packetBuffer[16] = (tempval >> 24) & 0XFF; tempval = timestamp1970; packetBuffer[17] = (tempval >> 16) & 0xFF; tempval = timestamp1970; packetBuffer[18] = (tempval >> 8) & 0xFF; tempval = timestamp1970; packetBuffer[19] = (tempval) & 0xFF; packetBuffer[20] = 0; packetBuffer[21] = 0; packetBuffer[22] = 0; packetBuffer[23] = 0; //copy originate timestamp from incoming UDP transmit timestamp packetBuffer[24] = packetBuffer[40]; packetBuffer[25] = packetBuffer[41]; packetBuffer[26] = packetBuffer[42]; packetBuffer[27] = packetBuffer[43]; packetBuffer[28] = packetBuffer[44]; packetBuffer[29] = packetBuffer[45]; packetBuffer[30] = packetBuffer[46]; packetBuffer[31] = packetBuffer[47]; //receive timestamp packetBuffer[32] = (tempval >> 24) & 0XFF; tempval = timestamp1970; packetBuffer[33] = (tempval >> 16) & 0xFF; tempval = timestamp1970; packetBuffer[34] = (tempval >> 8) & 0xFF; tempval = timestamp1970; packetBuffer[35] = (tempval) & 0xFF; packetBuffer[36] = 0; packetBuffer[37] = 0; packetBuffer[38] = 0; packetBuffer[39] = 0; //transmitt timestamp packetBuffer[40] = (tempval >> 24) & 0XFF; tempval = timestamp1970; packetBuffer[41] = (tempval >> 16) & 0xFF; tempval = timestamp1970; packetBuffer[42] = (tempval >> 8) & 0xFF; tempval = timestamp1970; packetBuffer[43] = (tempval) & 0xFF; packetBuffer[44] = 0; packetBuffer[45] = 0; packetBuffer[46] = 0; packetBuffer[47] = 0; // Reply to the IP address and port that sent the NTP request Udp.beginPacket(Remote, PortNum); Udp.write(packetBuffer,NTP_PACKET_SIZE); Udp.endPacket(); } #else void processNTP() {} #endif

Look here: https://forum.mysensors.org/topic/11135/something-s-cooking-in-the-mysensors-labs?_=1665077470840

UPDATE: if at one point you need to use GPIO18 for something other then RF24L01 then you have to delete the spi-cs-extend.dtbo file from the /boot/overlays/ and then reboot.

@OldSurferDude thank you so much for your reply, I’ll definitely look into this further! Martin

Thank you very mcuh for your reply, i'll defintely take a look to the sonoff devices if it can suits my need. In the same time regarding eclettis, i contacted them and their reply is that : *Our commands for home automation systems are simple normally open commands so they can be connected to every system. Just pay attention before connecting the device: ensure that the working voltage is properly configured in order to avoid to damage the device. * So i'm still looking in the same time for battery powered 4 way transmitter and corresponding receiver for DC system, on the top of that everything is dimmable led light...

@chabo_mq Could this possibly be an IR light barrier?

@nagelc Yeah, that was me. I found it makes a difference.

So the station is finally working, with the data being sent to googlesheets and integrated into Data Studio. [image: 1658446554681-2022-07-21_20h33_36.png]

@ben999 @NeverDie I had found a similar article about making the antenna a dipole. The interesting thing the article stressed was the lengths of the wires. I'm not an antenna engineer (my brother is) so I made the wires as suggested. I think it made a small improvement. and I still use that radio. My advice on antennas is: don't modify it. If your application needs more range, you're going to need more power. Signal strength drops off with the cube of the distance. So you're going to need a better antenna. For $3 (and a month or two delivery time) you can get a theoretically better module+antenna

A different link to the same thesis as previoiusly where he claims a wake-up distance of 20 meters: https://hh.diva-portal.org/smash/get/diva2:1187369/FULLTEXT02.pdf Well, it looks not difficult to construct. The AS3933 chips are available for around $1.30 on aliexpress, so cheaper than nRF5x chips. Perhaps cheapest of all would be be a tightly controlled nRF24L01, but it would surely draw more current listening than an AS3933.

final sketch and functional with MyController /* * DESCRIPTION : 4 inputs and 4 outputs on i2C bus with a PCF8574 * * LIBRAIRIES: * - Rob Tillaart pour PCF8574 https://github.com/RobTillaart/Arduino/tree/master/libraries/PCF8574 * - MySensors / Arduino Uno https://github.com/mysensors/MySensors * * ELEMENTS: * - Expander PCF8574 avec module Metasys JC / 4di 4do - 0X03D i2c adress * * MODIFICATION: * -x- RAS : Fonctionnelle * -o- * -o- * * (36%) de l'espace de stockage de programmes */ //----------- 9 Mai 2022 ---------------- PCF8574 -4DI-4DO / MyS RS485 et MyC -----------------// //------------------- MyS --------------------------------- //#define MY_DEBUG /*Enable debug prints to serial monitor*/ //#define MY_DEBUG_OTA_DISABLE_ECHO //testing #define MY_TRANSPORT_WAIT_READY_MS 3000 /*Tempo de mis en Com (millisecondes) à placer avant Mysensors.h*/ #define MY_NODE_ID 40 /*Node en ID static*/ /* ----- Module TTL-RS485 ----*/ #define MY_RS485 /*Apl du transport RS485 (protocol?)*/ #define MY_RS485_DE_PIN 10 /*Cmd DE pin*/ #define MY_RS485_BAUD_RATE 9600 /*Set RS485 baud rate to use*/ #define MY_REPEATER_FEATURE /*Activer fonctionnalité de répéteur du nœud*/ #include <MySensors.h> //---------------- PCF ------------------------------- #include "PCF8574.h" PCF8574 PCF27a (0x3D); // adjust addresses i2c pcf8574 // ------ objet ------ #define CHILD_ID_B0 0 /*Id IN - bp */ #define CHILD_ID_B1 1 #define CHILD_ID_B2 2 #define CHILD_ID_B3 3 #define CHILD_ID_R4 4 /*Id OUT - relay */ #define CHILD_ID_R5 5 #define CHILD_ID_R6 6 #define CHILD_ID_R7 7 #define RELAY_ON 0 // 1 valeur #define RELAY_OFF 1 // 0 invers //---------- MyS ------------- MyMessage msg0(CHILD_ID_B0,V_TRIPPED); /*Boton*/ MyMessage msg1(CHILD_ID_B1,V_TRIPPED); MyMessage msg2(CHILD_ID_B2,V_TRIPPED); MyMessage msg3(CHILD_ID_B3,V_TRIPPED); MyMessage msg4(CHILD_ID_R4,V_STATUS); /*Relay*/ MyMessage msg5(CHILD_ID_R5,V_STATUS); MyMessage msg6(CHILD_ID_R6,V_STATUS); MyMessage msg7(CHILD_ID_R7,V_STATUS); bool info; // pour info GW sur MyC bool state = false; // output // bool state4 = false; bool state5 = false; bool state6 = false; bool state7 = false; int oldValue0=-1; int oldValue1=-1; int oldValue2=-1; int oldValue3=-1; // Input //---------------- SETUP ------------------------- void setup() { // Serial.begin(115200); // debug //--------- testing IsConnected i2c PCfx ------------ Serial.println(__FILE__); Serial.print("PCF8574_LIB_VERSION:\t"); Serial.println(PCF8574_LIB_VERSION); if (!PCF27a.begin()) { Serial.println("could not initialize..."); } if (!PCF27a.isConnected()) { Serial.println("=> not connected"); } else { Serial.println("=> connected!!"); } // ---- info send to gateway ---- send(msg0.set(info)); send(msg1.set(info)); //input wait(200); send(msg2.set(info)); send(msg3.set(info)); //input wait(200); //delays for frames, depending on system load and bus type (wireless or wired) send(msg4.set(info)); send(msg5.set(info)); //output wait(200); send(msg6.set(info)); send(msg7.set(info)); //output } //----------------- MyS ---------------------------- void presentation() { sendSketchInfo("PCF8574 x4in/out - node40", "2.0"); /*info version sketch*/ /*Mysenors Enregistre Child sur la Gw*/ present(CHILD_ID_B0, S_DOOR, "boton0"); /*Boton*/ present(CHILD_ID_B1, S_DOOR, "boton1"); wait(200); present(CHILD_ID_B2, S_DOOR, "boton2"); present(CHILD_ID_B3, S_DOOR, "boton3"); wait(200); //delays for frames, depending on system load and bus type (wireless or wired) present(CHILD_ID_R4, S_BINARY, "relay4"); /*Relay*/ present(CHILD_ID_R5, S_BINARY, "relay5"); wait(200); present(CHILD_ID_R6, S_BINARY, "relay6"); present(CHILD_ID_R7, S_BINARY, "relay7"); wait(200); // metric = getControllerConfig().isMetric; } //----------------- LOOP ---------------------------- void loop() { //----------- MyS input ------------------------------- int value0 = PCF27a.read(0); if (value0 != oldValue0) { send(msg0.set(value0==HIGH ? 1 : 0)); //Send new value oldValue0 = value0; } int value1 = PCF27a.read(1); if (value1 != oldValue1) { send(msg1.set(value1==HIGH ? 1 : 0)); oldValue1 = value1; } int value2 = PCF27a.read(2); if (value2 != oldValue2) { send(msg2.set(value2==HIGH ? 1 : 0)); oldValue2 = value2; } int value3 = PCF27a.read(3); if (value3 != oldValue3) { send(msg3.set(value3==HIGH ? 1 : 0)); oldValue3 = value3; } } //----------- MyS out ------------------------------- void receive(const MyMessage &message) { if (message.getType()==V_STATUS) { switch (message.sensor) { case 4: state= message.getBool(); PCF27a.write(4, state?RELAY_ON:RELAY_OFF); break; case 5: state = message.getBool(); PCF27a.write(5, state?RELAY_ON:RELAY_OFF); break; case 6: state = message.getBool(); PCF27a.write(6, state?RELAY_ON:RELAY_OFF); break; case 7: state = message.getBool(); PCF27a.write(7, state?RELAY_ON:RELAY_OFF); break; } } } //------------------------------ End pgm -------------------------------------

i had good experience with it. . .

@llasking Have a look on the arduino forum or github - I still use the older tmrh library for point-to-point on things made before I changed over to mysensors. There is also a nrf24-lite library as well, but I have never used it.