Yes, that worked... I downloaded master.zip and replaced the current Liquid Crystal folder with the new one. Restarted IDE and was able to compile and upload the sketch. Thank you!

@tekka I moved the library and reinstalled. The sketch works now. Thank you for pointing me in the right direction!

Here is my first prototype of a working solution for a timing light: ( neopixal timing light):https://youtu.be/b3TDGKUS05I

Thank you for direction @mfalkvidd !

Thank you for your reply. I did resolve the problem and wanted to share what I did, in hopes of helping other newbies.
Firstly, I double checked the wiring, compared it to the working gateway and it seemed to be fine but still did not work.

I ran across this post and it turned out to be ideal for my situation:
https://forum.arduino.cc/index.php?topic=421081.0

Got the two radios communicating in a simplistic configuration and once working, uploaded mysensors sketches and the radios continued to work correctly. Maybe dismantling and reconnecting was the fix. Not sure, but things are working now. Thank you for a great resource of information and projects!

I am attempting to set up a moisture sensor, using the diagram and included sketch (https://www.mysensors.org/build/moisture). The diagram shows pin 3 for data but the sketch references d6 and d7. I don't see any reference to pin 3 there. I am not clear why there are references to d6 and d7 when my sensor only has a single data pin.

@bjacobse That seems to be the ticket! I will update the project as I learn more and develop a prototype.

Version 0.94.4

Thank you for the recommendation. I learned to look there through trial-and-error but the relay does not show up.

However, everything works as expected (4 relays show up in Unused Entities) when I use the following sketch:

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// Override Setting for Manual Node ID to 2
#define MY_NODE_ID 2

// Enable debug prints to serial monitor
#define MY_DEBUG 

// Enable and select radio type attached
#define MY_RADIO_NRF24

// Enable repeater functionality for this node
#define MY_REPEATER_FEATURE

#include <SPI.h>
#include <MySensors.h>

#define RELAY_1  3          // Arduino Digital I/O pin number for first relay (second on pin+1 etc)
#define NUMBER_OF_RELAYS 4  // Total number of attached relays: 4

// Opto Relay Module I was using Active Low - Low (0):ON, High (1): OFF
#define RELAY_ON 0          // GPIO value to write to turn on attached relay
#define RELAY_OFF 1         // GPIO value to write to turn off attached relay

bool initialValueSent = false;

//Init MyMessage for Each Child ID
MyMessage msg1(1, V_LIGHT);
MyMessage msg2(2, V_LIGHT);
MyMessage msg3(3, V_LIGHT);
MyMessage msg4(4, V_LIGHT);

void before() { 
  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS;sensor++, pin++) {
    // Then set relay pins in output mode
    pinMode(pin, OUTPUT);   
    // Set relay to last known state (using eeprom storage) 
    digitalWrite(pin, loadState(sensor)?RELAY_ON:RELAY_OFF);
  }
}

void setup() {
  
}

void presentation()  
{   
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Relay", "1.0");

  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS;sensor++, pin++) {
    // Register all sensors to gw (they will be created as child devices)
    present(sensor, S_LIGHT);
  }
}


void loop() 
{
  if (!initialValueSent) {
    Serial.println("Sending initial value");
    send(msg1.set(loadState(1)?RELAY_OFF:RELAY_ON),true);
    wait(1000);
    send(msg2.set(loadState(2)?RELAY_OFF:RELAY_ON),true);
    wait(1000);
    send(msg3.set(loadState(3)?RELAY_OFF:RELAY_ON),true);
    wait(1000);
    send(msg4.set(loadState(4)?RELAY_OFF:RELAY_ON),true);
    wait(1000);
    Serial.println("Sending initial value: Completed");
    wait(5000);
  }
}

void receive(const MyMessage &message) {
  Serial.println("=============== Receive Start =======================");
  if (message.isAck()) {
     Serial.println(">>>>> ACK <<<<<");
     Serial.println("This is an ack from gateway");
     Serial.println("<<<<<< ACK >>>>>>");
  }
  // We only expect one type of message from controller. But we better check anyway.
  if (message.type==V_LIGHT) {
    Serial.println(">>>>> V_LIGHT <<<<<");
    if (!initialValueSent) {
      Serial.println("Receiving initial value from controller");
      initialValueSent = true;
    }
     // Update relay state to HA
     digitalWrite(message.sensor-1+RELAY_1, message.getBool()?RELAY_ON:RELAY_OFF);
     switch (message.sensor) {
        case 1:
          Serial.print("Incoming change for sensor 1");
          send(msg1.set(message.getBool()?RELAY_OFF:RELAY_ON));
          break;
        case 2:
          Serial.print("Incoming change for sensor 2");
          send(msg2.set(message.getBool()?RELAY_OFF:RELAY_ON));
          break;
        case 3:
          Serial.print("Incoming change for sensor 3");
          send(msg3.set(message.getBool()?RELAY_OFF:RELAY_ON));
          break;
        case 4:
          Serial.print("Incoming change for sensor 4");
          send(msg4.set(message.getBool()?RELAY_OFF:RELAY_ON));
          break;                    
        default: 
          Serial.println("Default Case: Receiving Other Sensor Child ID");
        break;
     }
     // Store state in Arduino eeprom
     saveState(message.sensor, message.getBool());
     Serial.print("Saved State for sensor: ");
     Serial.print( message.sensor);
     Serial.print(", New status: ");
     Serial.println(message.getBool());
     Serial.println("<<<<<< V_LIGHT >>>>>>");
   } 
   Serial.println("=============== Receive END =======================");
}```

Apologies!! I kept getting errors when using that board, so used another. I am on a new worksation and it turns out python was not installed. The error ceased after I installed. The sketch works fine now.

@mfalkvidd Got it! Had to put on top of sketch to get it to work.. Thank you!

Will this mess with data sent to my home assistant controller, or only disable serial monitor and usb?

Ardunio Nano

Is there a way to utilize pin D1 for my 8 relay module with this or a modified sketch? I understand from research that the serial commands are getting in the way but I am not sure how to work around this and need pins 8-13 for my radio. (Powering via vin)

// Override Setting for Manual Node ID to 2
#define MY_NODE_ID 51

// Enable debug prints to serial monitor
#define MY_DEBUG 

// Enable and select radio type attached
#define MY_RADIO_NRF24

// Enable repeater functionality for this node
#define MY_REPEATER_FEATURE

#include <SPI.h>
#include <MySensors.h>

#define RELAY_1  1          // Arduino Digital I/O pin number for first relay (second on pin+1 etc)
#define NUMBER_OF_RELAYS 8 // Total number of attached relays: 4

// Opto Relay Module I was using Active Low - Low (0):ON, High (1): OFF
#define RELAY_ON 0          // GPIO value to write to turn on attached relay
#define RELAY_OFF 1         // GPIO value to write to turn off attached relay

bool initialValueSent = false;

//Init MyMessage for Each Child ID
MyMessage msg1(1, V_LIGHT);
MyMessage msg2(2, V_LIGHT);
MyMessage msg3(3, V_LIGHT);
MyMessage msg4(4, V_LIGHT);
MyMessage msg5(5, V_LIGHT);
MyMessage msg6(6, V_LIGHT);
MyMessage msg7(7, V_LIGHT);
MyMessage msg8(8, V_LIGHT);

void before() { 
  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS;sensor++, pin++) {
    // Then set relay pins in output mode
    pinMode(pin, OUTPUT);   
    // Set relay to last known state (using eeprom storage) 
    digitalWrite(pin, loadState(sensor)?RELAY_ON:RELAY_OFF);
  }
}

void setup() {
  
}

void presentation()  
{   
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Multiple Relay", "1c.0");

  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS;sensor++, pin++) {
    // Register all sensors to gw (they will be created as child devices)
    present(sensor, S_LIGHT);
  }
}


void loop() 
{
  if (!initialValueSent) {
    Serial.println("Sending initial value");
    send(msg1.set(loadState(1)?RELAY_OFF:RELAY_ON),true);
    wait(1000);
    send(msg2.set(loadState(2)?RELAY_OFF:RELAY_ON),true);
    wait(1000);
    send(msg3.set(loadState(3)?RELAY_OFF:RELAY_ON),true);
    wait(1000);
    send(msg4.set(loadState(4)?RELAY_OFF:RELAY_ON),true);
    wait(1000);
     send(msg5.set(loadState(5)?RELAY_OFF:RELAY_ON),true);
    wait(1000);
    send(msg6.set(loadState(6)?RELAY_OFF:RELAY_ON),true);
    wait(1000);
    send(msg7.set(loadState(7)?RELAY_OFF:RELAY_ON),true);
    wait(1000);
    send(msg8.set(loadState(8)?RELAY_OFF:RELAY_ON),true);
    wait(1000);
    Serial.println("Sending initial value: Completed");
    wait(5000);
  }
}

void receive(const MyMessage &message) {
  Serial.println("=============== Receive Start =======================");
  if (message.isAck()) {
     Serial.println(">>>>> ACK <<<<<");
     Serial.println("This is an ack from gateway");
     Serial.println("<<<<<< ACK >>>>>>");
  }
  // We only expect one type of message from controller. But we better check anyway.
  if (message.type==V_LIGHT) {
    Serial.println(">>>>> V_LIGHT <<<<<");
    if (!initialValueSent) {
      Serial.println("Receiving initial value from controller");
      initialValueSent = true;
    }
     // Update relay state to HA
     digitalWrite(message.sensor-1+RELAY_1, message.getBool()?RELAY_ON:RELAY_OFF);
     switch (message.sensor) {
        case 1:
          Serial.print("Incoming change for sensor 1");
          send(msg1.set(message.getBool()?RELAY_OFF:RELAY_ON));
          break;
        case 2:
          Serial.print("Incoming change for sensor 2");
          send(msg2.set(message.getBool()?RELAY_OFF:RELAY_ON));
          break;
        case 3:
          Serial.print("Incoming change for sensor 3");
          send(msg3.set(message.getBool()?RELAY_OFF:RELAY_ON));
          break;
        case 4:
          Serial.print("Incoming change for sensor 4");
          send(msg4.set(message.getBool()?RELAY_OFF:RELAY_ON));
          break;
        case 5:
          Serial.print("Incoming change for sensor 5");
          send(msg5.set(message.getBool()?RELAY_OFF:RELAY_ON));
          break;
        case 6:
          Serial.print("Incoming change for sensor 6");
          send(msg6.set(message.getBool()?RELAY_OFF:RELAY_ON));
          break;
        case 7:
          Serial.print("Incoming change for sensor 7");
          send(msg7.set(message.getBool()?RELAY_OFF:RELAY_ON));
          break;
        case 8:
          Serial.print("Incoming change for sensor 8");
          send(msg8.set(message.getBool()?RELAY_OFF:RELAY_ON));
          break;                               
        default: 
          Serial.println("Default Case: Receiving Other Sensor Child ID");
        break;
     }
     // Store state in Arduino eeprom
     saveState(message.sensor, message.getBool());
     Serial.print("Saved State for sensor: ");
     Serial.print( message.sensor);
     Serial.print(", New status: ");
     Serial.println(message.getBool());
     Serial.println("<<<<<< V_LIGHT >>>>>>");
   } 
   Serial.println("=============== Receive END =======================");
}

@BearWithBeard if I use the radio you recommend, will it simply replace what I have without any change to sketches and wiring?

Thank you! I will check your recommendation out and run some field tests.

I will be assembling my auto-watering garden project soon. My gardens are about 250-300' (90m) from my house and over an embankment that drops about 10', so I don't have actual line of site. I am not sure how the signal waves work, or if this causes me any concern. I am using HiLetgo 2pcs NRF24L01+PA+LNA Wireless Transceiver RF Transceiver Module with SMA Antenna 2.4G 1100m for my HA serial gateway and my sensors are using the standard built in antenna for the NRF24L01 radio. I would like to assemble my sensors prior to the install and want to be sure my sensors and controller have solid connectivity. Does this seem workable, in general, or is it possible I need to have long range antennas on the sensors too?

@BearWithBeard said in 2nd sensor in sketch not showing up in HA:

send(msg2.set(sensorValueA1));

Yes, that was it!! Thank you!!

I am trying to modify my working moisture sensor sketch to present 2 child Ids instead of one. Arduino serial monitor shows the data from both sensors and HA sees it but the 2nd sensor does not show up in unused entities. I am confident I am erring in my sketch somehow but not sure where.

/*
  AnalogReadSerial

  Reads an analog input on pin 0, prints the result to the Serial Monitor.
  Graphical representation is available using Serial Plotter (Tools > Serial Plotter menu).
  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/AnalogReadSerial
*/

// Enable debug prints
// #define MY_DEBUG

// Enable and select radio type attached
#define MY_RADIO_RF24
//#define MY_RADIO_NRF5_ESB
//#define MY_RADIO_RFM69
//#define MY_RADIO_RFM95
#define CHILD_ID_A0 0
#define CHILD_ID_A1 1
#include <MySensors.h>
MyMessage msg(CHILD_ID_A0, V_LEVEL);
MyMessage msg2(CHILD_ID_A1, V_LEVEL);
// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
}
void presentation()
{
  sendSketchInfo("Analog Soil Moisture Sensor", "1c.0");
  present(CHILD_ID_A0, S_MOISTURE);
  present(CHILD_ID_A1, S_MOISTURE);
}
// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  int sensorValueA1 = analogRead(A1);
  // print out the value you read:
  Serial.println(sensorValue);
  Serial.println(sensorValueA1);
  send(msg.set(sensorValue));
  send(msg.set(sensorValueA1));
  delay(10000);        // delay in between reads for stability
}

HA logs:

2020-03-16 15:56:04 WARNING (MainThread) [mysensors.sensor] child_id 0 already exists in children of node 105, cannot add child
2020-03-16 15:56:04 WARNING (MainThread) [mysensors.sensor] child_id 1 already exists in children of node 105, cannot add child

Thanks for the replies. I think I will just go with 3 sensors per raised bed, per nano. That will keep the runs under 10'