I am attempting to incorporate a moisture sensor into HA but getting could not convert to float errors in the logs. The sensor does show up in mysensors.json but not in the gui.

Home Assistant 0.94.4

I am using a simple FC-28 moisture sensor: VCC, Gnd, D0 connected to D6 of the UNO and A0 connected to D7.

SoilMoistSensor Sketch:

/*
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2018 Sensnology AB
 * Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * DESCRIPTION
 *
 * Arduino soil moisture based on gypsum sensor/resistive sensor to avoid electric catalyse in soil
 *  Required to interface the sensor: 2 * 4.7kOhm + 2 * 1N4148
 *
 * Gypsum sensor and calibration:
 *	DIY: See http://vanderleevineyard.com/1/category/vinduino/1.html
 *	Built: Davis / Watermark 200SS
 *		http://www.cooking-hacks.com/watermark-soil-moisture-sensor?_bksrc=item2item&_bkloc=product
 *		http://www.irrometer.com/pdf/supportmaterial/sensors/voltage-WM-chart.pdf
 *		cb (centibar) http://www.irrometer.com/basics.html
 *			0-10 Saturated Soil. Occurs for a day or two after irrigation
 *			10-20 Soil is adequately wet (except coarse sands which are drying out at this range)
 *			30-60 Usual range to irrigate or water (except heavy clay soils).
 *			60-100 Usual range to irrigate heavy clay soils
 *			100-200 Soil is becoming dangerously dry for maximum production. Proceed with caution.
 *
 * Connection:
 * D6, D7: alternative powering to avoid sensor degradation
 * A0, A1: alternative resistance measuring
 *
 *  Based on:
 *  "Vinduino" portable soil moisture sensor code V3.00
 *   Date December 31, 2012
 *   Reinier van der Lee and Theodore Kaskalis
 *   www.vanderleevineyard.com
 * Contributor: epierre
 */

// Copyright (C) 2015, Reinier van der Lee
// www.vanderleevineyard.com

// 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
// 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.

// Enable debug prints to serial monitor
#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

#include <math.h>       // Conversion equation from resistance to %
#include <MySensors.h>

// Setting up format for reading 3 soil sensors
#define NUM_READS (int)10    // Number of sensor reads for filtering
#define CHILD_ID 0

MyMessage msg(CHILD_ID, V_LEVEL);
uint32_t SLEEP_TIME = 30000; // Sleep time between reads (in milliseconds)

long buffer[NUM_READS];
int idx;

/// @brief Structure to be used in percentage and resistance values matrix to be filtered (have to be in pairs)
typedef struct {
	int moisture; //!< Moisture
	long resistance; //!< Resistance
} values;

const long knownResistor = 4700;  // Constant value of known resistor in Ohms

int supplyVoltage;                // Measured supply voltage
int sensorVoltage;                // Measured sensor voltage

values valueOf[NUM_READS];        // Calculated moisture percentages and resistances to be sorted and filtered

int i;                            // Simple index variable

void setup()
{
	// initialize the digital pins as an output.
	// Pin 6,7 is for sensor 1
	// initialize the digital pin as an output.
	// Pin 6 is sense resistor voltage supply 1
	pinMode(6, OUTPUT);

	// initialize the digital pin as an output.
	// Pin 7 is sense resistor voltage supply 2
	pinMode(7, OUTPUT);
}

void presentation()
{
	sendSketchInfo("Soil Moisture Sensor Reverse Polarity", "1.0");
	present(CHILD_ID, S_MOISTURE);
}

void loop()
{

	measure(6,7,1);
	Serial.print ("\t");
	Serial.println (average());
	long read1 = average();

	measure(7,6,0);
	Serial.print ("\t");
	Serial.println (average());
	long read2= average();

	long sensor1 = (read1 + read2)/2;

	Serial.print ("resistance bias =" );
	Serial.println (read1-read2);
	Serial.print ("sensor bias compensated value = ");
	Serial.println (sensor1);
	Serial.println ();

	//send back the values
	send(msg.set((int32_t)ceil(sensor1)));
	// delay until next measurement (msec)
	sleep(SLEEP_TIME);
}



void measure (int phase_b, int phase_a, int analog_input)
{
	// read sensor, filter, and calculate resistance value
	// Noise filter: median filter

	for (i=0; i<NUM_READS; i++) {

		// Read 1 pair of voltage values
		digitalWrite(phase_a, HIGH);                 // set the voltage supply on
		delayMicroseconds(25);
		supplyVoltage = analogRead(analog_input);   // read the supply voltage
		delayMicroseconds(25);
		digitalWrite(phase_a, LOW);                  // set the voltage supply off
		delay(1);

		digitalWrite(phase_b, HIGH);                 // set the voltage supply on
		delayMicroseconds(25);
		sensorVoltage = analogRead(analog_input);   // read the sensor voltage
		delayMicroseconds(25);
		digitalWrite(phase_b, LOW);                  // set the voltage supply off

		// Calculate resistance
		// the 0.5 add-term is used to round to the nearest integer
		// Tip: no need to transform 0-1023 voltage value to 0-5 range, due to following fraction
		long resistance = (knownResistor * (supplyVoltage - sensorVoltage ) / sensorVoltage) ;

		delay(1);
		addReading(resistance);
		Serial.print (resistance);
		Serial.print ("\t");
	}
}

Arduino Serial Monitor:

11679 TSF:MSG:SEND,105-105-0-0,s=0,c=1,t=37,pt=4,l=4,sg=0,ft=0,st=OK:2
11687 MCO:SLP:MS=30000,SMS=0,I1=255,M1=255,I2=255,M2=255
11693 TSF:TDI:TSL
11695 MCO:SLP:WUP=-1
11697 TSF:TRI:TSB
34	11	0	-11	0	11	23	23	11	0		10
-21	-10	10	11	0	-11	-22	-11	-10	11		-5
resistance bias =15
sensor bias compensated value = 2

11756 TSF:MSG:SEND,105-105-0-0,s=0,c=1,t=37,pt=4,l=4,sg=0,ft=0,st=OK:2
11765 MCO:SLP:MS=30000,SMS=0,I1=255,M1=255,I2=255,M2=255
11770 TSF:TDI:TSL
11772 MCO:SLP:WUP=-1
11773 TSF:TRI:TSB
11	22	23	11	-11	-11	0	11	23	11		9
-11	-11	-11	0	11	11	0	-11	-22	-11		-5
resistance bias =14
sensor bias compensated value = 2

11833 TSF:MSG:SEND,105-105-0-0,s=0,c=1,t=37,pt=4,l=4,sg=0,ft=0,st=OK:2
11842 MCO:SLP:MS=30000,SMS=0,I1=255,M1=255,I2=255,M2=255
11847 TSF:TDI:TSL
11849 MCO:SLP:WUP=-1
11851 TSF:TRI:TSB
23	0	0	-11	11	23	23	23	0	-11		8
-10	0	10	22	0	-22	-22	-10	11	11		-1
resistance bias =9
sensor bias compensated value = 3

11911 TSF:MSG:SEND,105-105-0-0,s=0,c=1,t=37,pt=4,l=4,sg=0,ft=0,st=OK:3
11919 MCO:SLP:MS=30000,SMS=0,I1=255,M1=255,I2=255,M2=255
11924 TSF:TDI:TSL
// Averaging algorithm
void addReading(long resistance)
{
	buffer[idx] = resistance;
	idx++;
	if (idx >= NUM_READS) {
		idx = 0;
	}
}

long average()
{
	long sum = 0;
	for (int i = 0; i < NUM_READS; i++) {
		sum += buffer[i];
	}
	return (long)(sum / NUM_READS);
}

Mysensors.json Moisture Sensor:
"105": {
"sensor_id": 105,
"children": {
"0": {
"id": 0,
"type": 35,
"description": "",
"values": {
"37": "3"
}
}
},
"type": 17,
"sketch_name": "Soil Moisture Sensor Reve",
"sketch_version": "1.0",
"battery_level": 0,
"protocol_version": "2.3.1",
"heartbeat": 0
}

HA Logs:

ValueError: could not convert string to float: '2.1.1'
2019-07-03 12:35:20 DEBUG (SyncWorker_2) [mysensors.persistence] Saving sensors to persistence file /home/homeassistant/.homeassistant/mysensors.json
2019-07-03 12:35:47 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:TSF:MSG:READ,105-105-0,s=0,c=1,t=37,pt=4,l=4,sg=0:1
2019-07-03 12:35:47 DEBUG (MainThread) [homeassistant.components.mysensors.gateway] Node update: node 105 child 0
2019-07-03 12:35:47 DEBUG (MainThread) [homeassistant.components.mysensors.device] Entity update: Soil Moisture Sensor Reve 105 0: value_type 37, value = 1
2019-07-03 12:35:47 ERROR (MainThread) [homeassistant.components.mysensors.device] Error updating Soil Moisture Sensor Reve 105 0
Traceback (most recent call last):
  File "/srv/homeassistant/lib/python3.6/site-packages/homeassistant/components/mysensors/device.py", line 103, in update
    await self._async_update_callback()
  File "/srv/homeassistant/lib/python3.6/site-packages/homeassistant/components/mysensors/device.py", line 129, in _async_update_callback
    await self.async_update_ha_state(True)
  File "/srv/homeassistant/lib/python3.6/site-packages/homeassistant/helpers/entity.py", line 225, in async_update_ha_state
    self._async_write_ha_state()
  File "/srv/homeassistant/lib/python3.6/site-packages/homeassistant/helpers/entity.py", line 258, in _async_write_ha_state
    unit_of_measurement = self.unit_of_measurement
  File "/srv/homeassistant/lib/python3.6/site-packages/homeassistant/components/mysensors/sensor.py", line 75, in unit_of_measurement
    if (float(self.gateway.protocol_version) >= 1.5
ValueError: could not convert string to float: '2.1.1'
2019-07-03 12:35:50 DEBUG (SyncWorker_8) [mysensors.persistence] Saving sensors to persistence file /home/homeassistant/.homeassistant/mysensors.json

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.

This script will be more helpful for beginners. The previous script turns on/off all relays. This one controls only the specified relay.

- id: '1562092064918'
  alias: Power Up Relay_2.1
  trigger:
  - entity_id: switch.relay_4_2
    from: 'off'
    platform: state
    to: 'on'
  condition: []
  action:
  - alias: ''
    data:
      entity_id: switch.relay_2_1
    service: switch.turn_on
- id: '1562093186484'
  alias: Power Down Relay_2.1
  trigger:
  - entity_id: switch.relay_4_2
    from: 'on'
    platform: state
    to: 'off'
  condition: []
  action:
  - data:
      entity_id: switch.relay_2_1
    service: switch.turn_off

@skywatch What fun!! I figured out how to turn the pump relay on and off, based on the state of the water solenoid relay. This automation.yaml script works :

- id: '1562092064918'
  alias: Relay UP
  trigger:
  - entity_id: switch.relay_4_2
    from: 'off'
    platform: state
    to: 'on'
  condition:
  - condition: state
    entity_id: switch.relay_4_2
    state: 'on'
  - condition: state
    entity_id: switch.relay_2_1
    state: 'off'
  action:
  - alias: ''
    data: {}
    service: switch.turn_on
- id: '1562093186484'
  alias: Relay Down
  trigger:
  - entity_id: switch.relay_4_2
    from: 'on'
    platform: state
    to: 'off'
  condition:
  - condition: state
    entity_id: switch.relay_2_1
    state: 'on'
  action:
  - service: switch.turn_off```

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:

Copy to clipboard
// 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 =======================");
}```

I had multiple sensors on my homeassistant controller, all working fine. I then attempted to attach another relay (RelayAcuator project and sketch). The relay showed up in mysensors.json but not the gui. I eliminated all other sensors and attempted a new sketch upload, with the same results. I ran across other posts on this subject and the common opinion was that an initial value was not sent to Home Assistant. Ideas???

Sketch:

/*
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2018 Sensnology AB
 * Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * REVISION HISTORY
 * Version 1.0 - Henrik Ekblad
 *
 * DESCRIPTION
 * Example sketch showing how to control physical relays.
 * This example will remember relay state after power failure.
 * http://www.mysensors.org/build/relay
 */

// Enable debug prints to serial monitor
#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

// Enable repeater functionality for this node
#define MY_REPEATER_FEATURE

#include <MySensors.h>

#define RELAY_PIN 4  // Arduino Digital I/O pin number for first relay (second on pin+1 etc)
#define NUMBER_OF_RELAYS 1 // Total number of attached relays
#define RELAY_ON 1  // GPIO value to write to turn on attached relay
#define RELAY_OFF 0 // GPIO value to write to turn off attached relay


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


void loop()
{

}

void receive(const MyMessage &message)
{
  // We only expect one type of message from controller. But we better check anyway.
  if (message.type==V_STATUS) {
    // Change relay state
    digitalWrite(message.sensor-1+RELAY_PIN, message.getBool()?RELAY_ON:RELAY_OFF);
    // Store state in eeprom
    saveState(message.sensor, message.getBool());
    // Write some debug info
    Serial.print("Incoming change for sensor:");
    Serial.print(message.sensor);
    Serial.print(", New status: ");
    Serial.println(message.getBool());
  }
}

Home assistant logs:

2019-07-01 15:26:03 DEBUG (MainThread) [homeassistant.components.mysensors.gateway] Node update: node 2 child 255
2019-07-01 15:26:03 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:TSF:MSG:READ,2-2-0,s=255,c=3,t=12,pt=0,l=3,sg=0:1.0
2019-07-01 15:26:03 DEBUG (MainThread) [homeassistant.components.mysensors.gateway] Node update: node 2 child 255
2019-07-01 15:26:03 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:TSF:MSG:READ,2-2-0,s=1,c=0,t=3,pt=0,l=0,sg=0:
2019-07-01 15:26:03 WARNING (MainThread) [mysensors.sensor] child_id 1 already exists in children of node 2, cannot add child
2019-07-01 15:26:03 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:TSF:MSG:READ,2-2-0,s=255,c=3,t=26,pt=1,l=1,sg=0:2
2019-07-01 15:26:03 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:TSF:MSG:SEND,0-0-2-2,s=255,c=3,t=27,pt=1,l=1,sg=0,ft=0,st=OK:1
2019-07-01 15:26:13 DEBUG (SyncWorker_1) [mysensors.persistence] Saving sensors to persistence file /home/homeassistant/.homeassistant/mysensors.json```

Mysensors.json

{
    "0": {
        "sensor_id": 0,
        "children": {},
        "type": 18,
        "sketch_name": null,
        "sketch_version": null,
        "battery_level": 0,
        "protocol_version": "2.1.1",
        "heartbeat": 0
    },
    "2": {
        "sensor_id": 2,
        "children": {
            "1": {
                "id": 1,
                "type": 3,
                "description": "",
                "values": {}
            }
        },
        "type": 18,
        "sketch_name": "Relay",
        "sketch_version": "1.0",
        "battery_level": 0,
        "protocol_version": "2.3.1",
        "heartbeat": 0
    }

I decided to look at things from the Home Assistant side and found what I was looking for under "automations". This simple script triggers my relay when motion is detected. Obviously, that would be a bad idea for watering a garden but now I understand how to trigger an action based on the state of a sensor.

- id: '1561653332262'
  alias: New Automation
  trigger:
  - entity_id: binary_sensor.relay_motion_105_0
    platform: state
  condition:
  - condition: state
    entity_id: binary_sensor.relay_motion_105_0
    state: 'on'
  action:
  - service: script.1561137758707

Thank you for your assistance!!

I am ready to start dinging around with one sensor state controlling a 2nd sensor, using Home Assistant as the controller but I am not finding what I am looking for. I need the state (on/off) of sensor 1 to signal sensor 2 to turn on/off (turn relays on/off) . I am assuming that will require a script setup on Home Assistant to do this.

Just need some examples (sketches) and supporting docs. It was mentioned this could be accomplished with the irrigation project build (which I plan on implementing) but for now, I just want a pinout high on relay-1 to trigger a 2nd relay to also go high (via wireless) .

Maybe this question is for Home Assistant? Not sure.

I need to trigger the relay on/off (via wireless) that is connected to the power of the pump via an arduino nano.

Very cool! I will dig into things and see if I can figure it out.