@AWI, @mfalkvidd Thank you for your time trying to help me.
I just found a Modified SD library to use pins A0-A3 for software SPI. I got it to work!!! So happy. 
If anyone interests, the link is below:
Modified SD library to use pins A0-A3 for software SPI
0_1475856752676_SD-hardcode-use-pins-A0-A3.zip
Is my send routine from the arduino + nRF24L01 + sensor correct?
send(msgvolt.setDestination(DESTINATION_NODE).set(dadosenviados, 2), 1);
Or:
send(msgvolt.set(dadosenviados, 2), 1);
And the receive routine from the arduino + nRF24L01 ?
void receive(const MyMessage &msgvolt) {
if (msgvolt.type == V_VOLTAGE) {
dadosenviados = msgvolt.getFloat();
Serial.print("Incoming");
Serial.println(msgvolt.getFloat());
Serial.println(dadosenviados);
}
The configuration of the arduino + nRF24L01 + sensor:
#define MY_DEBUG
#define MY_DEBUG_VERBOSE_RF24
#define MY_RADIO_NRF24
#define MY_NODE_ID 10
#define MY_RF24_CE_PIN 9
#define MY_RF24_CS_PIN 10
#define MY_RF24_PA_LEVEL RF24_PA_LOW
#define MY_RF24_PA_LEVEL_GW RF24_PA_LOW
#define MY_RF24_CHANNEL 76
#define MY_RF24_DATARATE RF24_250KBPS
#include <SPI.h>
#include <MySensors.h>
The configuration of the arduino + nRF24L01:
#define MY_DEBUG
#define MY_RADIO_NRF24
#define MY_DEBUG_VERBOSE_RF24
#define MY_GATEWAY_SERIAL
#define MY_NODE_ID 0
#define MY_RF24_CE_PIN 9
#define MY_RF24_CS_PIN 10
#define MY_RF24_PA_LEVEL RF24_PA_HIGH
#define MY_RF24_PA_LEVEL_GW RF24_PA_LOW
#define MY_RF24_CHANNEL 76
#define MY_RF24_DATARATE RF24_250KBPS
#include <MySensors.h>
#include <LiquidCrystal.h>
#include <SPI.h>
Hello! Hm, I removed the digitalWrite and I don't undestand why it doesn't get the data. I tried to print something in the receive routine and I got nothing. What do you mean about special case?
Thanks for the time spent with me.
Ok, I'm going to erase the void incomingMessage(const MyMessage &msgvolt) and the request(4, V_VOLTAGE, 10).
Also no savestate.
I tried to store in a global variable and display, but I didn't understand It, how do I read!?
void receive(const MyMessage &msgvolt) {
if (msgvolt.type==V_VOLTAGE) {
digitalWrite(msgvolt.sensor, msgvolt.getFloat());
dadosenviados = msgvolt.getFloat();
Serial.println(msgvolt.getFloat());
Serial.println(dadosenviados);
Serial.println(msgvolt.data);
}
This is what I'm getting in the serial:
Node:
Battery Voltage: 8.68 V
RF24:stop listening
RF24:write register, reg=0, value=14
RF24:open writing pipe, recipient=0
RF24:write register, reg=10, value=0
RF24:write register, reg=16, value=0
RF24:send message to 0, len=12
RF24:flushTX
RF24:write register, reg=7, value=48
RF24:start listening
RF24:write register, reg=0, value=15
RF24:write register, reg=10, value=10
TSP:MSG:SEND 10-10-0-0 s=4,c=1,t=38,pt=7,l=5,sg=0,ft=0,st=ok:8.68
RF24:read message, len=12
RF24:write register, reg=7, value=64
TSP:MSG:READ 0-0-10 s=4,c=1,t=38,pt=7,l=5,sg=0:8.68
Battery Voltage: 8.69 V
Gateway:
10;4;1;0;38;8.68
0;255;3;0;9;TSP:MSG:READ 10-10-0 s=4,c=1,t=38,pt=7,l=5,sg=0:8.68
0;255;3;0;9;TSP:MSG:ACK msg
0;255;3;0;9;TSP:MSG:SEND 0-0-10-10 s=4,c=1,t=38,pt=7,l=5,sg=0,ft=0,st=ok:8.68
10;4;1;0;38;8.68
Please, someone tell me how to get the voltage that i'm receiving. I've tried many things, I don't know why this doesn't work.
msgvolt.getFloat();
I can see the battery in the gateway through serial, but I don't know how to get it to show on the LCD.
Node:
#define MY_DEBUG
#define MY_DEBUG_VERBOSE_RF24
#define MY_RADIO_NRF24
#define DESTINATION_NODE 0
#define MY_NODE_ID 10
#define MY_PARENT_NODE_ID 0
#define MY_PARENT_NODE_IS_STATIC
#define MY_RF24_CE_PIN 9
#define MY_RF24_CS_PIN 10
#define MY_RF24_PA_LEVEL RF24_PA_LOW
#define MY_RF24_PA_LEVEL_GW RF24_PA_LOW
#define MY_RF24_CHANNEL 76
#define MY_RF24_DATARATE RF24_250KBPS
#include <SPI.h>
#include <MySensors.h>
int sensorTensaoDC = A0;
float valorTensaoDC;
int amostragem = 1000;
float mediaTotalTensaoDC = 0;
float R1 = 28000.0;
float R2 = 7600.0;
int sensorValue_aux = 0;
float voltsporUnidade = 0.005278592; // 5%1023
float dadosenviados;
MyMessage msgvolt(4, V_VOLTAGE);
void setup()
{
analogReference(DEFAULT);
pinMode(A0, INPUT);
}
void presentation() {
sendSketchInfo("Battery Meter", "1.0");
present(4, S_MULTIMETER, "Voltage", true);
}
void loop()
{
mediaTotalTensaoDC = 0;
for(int i=0; i < amostragem ; i++)
{
valorTensaoDC = analogRead(sensorTensaoDC);
valorTensaoDC =(valorTensaoDC*voltsporUnidade);
mediaTotalTensaoDC = mediaTotalTensaoDC+ (valorTensaoDC / (R2/(R1+R2)));
}
dadosenviados = mediaTotalTensaoDC / amostragem;
Serial.print("Battery Voltage: ");
Serial.print(dadosenviados);
Serial.println(" V");
send(msgvolt.setDestination(DESTINATION_NODE).set(dadosenviados, 2), 1);
wait(2000);
}
Gateway:
#define MY_DEBUG
#define MY_RADIO_NRF24
#define MY_GATEWAY_SERIAL
#define MY_NODE_ID 0
#define DESTINATION_NODE 10
#define MY_RF24_CE_PIN 9
#define MY_RF24_CS_PIN 10
#define MY_RF24_PA_LEVEL RF24_PA_LOW
#define MY_RF24_PA_LEVEL_GW RF24_PA_LOW
#define MY_RF24_CHANNEL 76
#define MY_RF24_DATARATE RF24_250KBPS
#include <MySensors.h>
#include <LiquidCrystal.h>
#include <SPI.h>
float dadosenviados = 0;
MyMessage msgvolt(4, V_VOLTAGE);
LiquidCrystal lcd(3, 2, 7, 6, 5, 4);
void setup()
{
lcd.begin(20, 4);
lcd.clear();
lcd.setCursor(5, 0);
lcd.print("Teste 1.6");
delay(5000);
lcd.setCursor(3, 2);
lcd.print("Carregando...");
delay(5000);
lcd.clear();
}
void presentation() {
sendSketchInfo("Battery Meter", "2.0");
present(4, S_MULTIMETER);
}
void receive(const MyMessage &msgvolt) {
saveState(msgvolt.sensor, msgvolt.getFloat());
dadosenviados = msgvolt.getFloat();
request(4, V_VOLTAGE, 10);
}
void incomingMessage(const MyMessage &msgvolt) {
request(4, V_VOLTAGE, 10);
dadosenviados = msgvolt.getFloat();
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("TENSAO");
lcd.setCursor(7, 0);
lcd.print(dadosenviados);
lcd.print("VOLTS");
lcd.setCursor(0, 1);
lcd.print(msgvolt.getFloat());
wait(1000);
Serial.print("Battery Voltage: ")`;
Serial.print(dadosenviados);
Serial.println(" V");
}
void loop() {
}
Is that how I send ? Can I use BINARY to my hall effect sensor? I'm using the digital pin to count every time it passes through a magnet.
MyMessage msg(NODE_ID, V_STATUS);
float value = 0;
void presentation()
{
present(NODE_ID, S_BINARY);
}
void loop()
{
send(msg.set(value));
}
Is that how I receive?
void receive(const MyMessage &message) {
// Handle incoming message
}
I have pins and I have already done this. 
Hey. I don't have I2C interface. Do I need it?
Ok, I'm getting there. I appreciate your advices, thanks. 
Now I can see the battery level in the serial. But I didn't understand how to receive the battery level in the gateway to show on my LCD display.
Gateway ok:
0;255;3;0;9;Starting gateway (RNNGA-, 2.0.0)
0;255;3;0;9;TSM:INIT
0;255;3;0;9;TSM:RADIO:OK
0;255;3;0;9;TSM:GW MODE
0;255;3;0;9;TSM:READY
0;255;3;0;14;Gateway startup complete.
0;255;0;0;18;2.0.0
0;255;3;0;9;No registration required
0;255;3;0;9;Init complete, id=0, parent=0, distance=0, registration=1
0;255;3;0;9;TSP:MSG:READ 10-10-255 s=255,c=3,t=7,pt=0,l=0,sg=0:
0;255;3;0;9;TSP:MSG:BC
0;255;3;0;9;TSP:MSG:FPAR REQ (sender=10)
0;255;3;0;9;TSP:CHKUPL:OK (FLDCTRL)
0;255;3;0;9;TSP:MSG:GWL OK
0;255;3;0;9;TSP:MSG:SEND 0-0-10-10 s=255,c=3,t=8,pt=1,l=1,sg=0,ft=0,st=ok:0
0;255;3;0;9;TSP:MSG:READ 10-10-0 s=255,c=3,t=24,pt=1,l=1,sg=0:1
0;255;3;0;9;TSP:MSG:PINGED (ID=10, hops=1)
0;255;3;0;9;TSP:MSG:SEND 0-0-10-10 s=255,c=3,t=25,pt=1,l=1,sg=0,ft=0,st=ok:1
0;255;3;0;9;TSP:MSG:READ 10-10-0 s=255,c=3,t=15,pt=6,l=2,sg=0:0100
0;255;3;0;9;TSP:MSG:SEND 0-0-10-10 s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=ok:0100
0;255;3;0;9;TSP:MSG:READ 10-10-0 s=255,c=0,t=17,pt=0,l=5,sg=0:2.0.0
10;255;0;0;17;2.0.0
0;255;3;0;9;TSP:MSG:READ 10-10-0 s=255,c=3,t=6,pt=1,l=1,sg=0:0
10;255;3;0;6;0
0;255;3;0;9;TSP:MSG:READ 10-10-0 s=255,c=3,t=11,pt=0,l=13,sg=0:Battery Meter
0;255;3;0;9;TSP:MSG:READ 10-10-0 s=255,c=3,t=12,pt=0,l=3,sg=0:1.0
0;255;3;0;9;TSP:MSG:READ 10-10-0 s=255,c=3,t=26,pt=1,l=1,sg=0:2
0;255;3;0;9;TSP:MSG:SEND 0-0-10-10 s=255,c=3,t=27,pt=1,l=1,sg=0,ft=0,st=ok:1
Node ok:
Starting sensor (RNNNA-, 2.0.0)
TSM:INIT
RF24:write register, reg=0, value=14
RF24:read register, reg=6, value=35
RF24:flushRX
TSM:RADIO:OK
RF24:start listening
RF24:write register, reg=10, value=10
TSP:ASSIGNID:OK (ID=10)
TSM:FPAR
RF24:stop listening
RF24:write register, reg=0, value=14
RF24:open writing pipe, recipient=255
RF24:write register, reg=10, value=255
RF24:send message to 255, len=7
RF24:flushTX
RF24:MAX_RT
TSP:MSG:READ 0-0-10 s=255,c=3,t=8,pt=1,l=1,sg=0:0
TSP:MSG:FPAR RES (ID=0, dist=0)
TSP:MSG:FPAR (PPAR FOUND)
TSP:MSG:PAR OK (ID=0, dist=1)
TSM:FPAR:OK
TSM:ID
TSM:CHKID:OK (ID=10)
TSM:UPL
TSP:PING:SEND (dest=0)
TSP:MSG:PONG RECV (hops=1)
TSP:CHKUPL:OK
TSM:UPL:OK
TSM:READY
Init complete, id=10, parent=0, distance=1, registration=1
Battery Voltage: 0.00 V
Battery Voltage: 5.91 V
Battery Voltage: 5.91 V
I'm trying to do the battery level example and I'm getting this:
Starting sensor (RNNNA-, 2.0.0)
TSM:INIT
TSM:RADIO:OK
TSP:ASSIGNID:OK (ID=10)
TSM:FPAR
TSP:MSG:SEND 10-10-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=bc:
TSP:MSG:READ 10-10-255 s=255,c=3,t=7,pt=0,l=0,sg=0:
TSP:MSG:BC
TSM:FPAR
TSP:MSG:SEND 10-10-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=bc:
TSP:MSG:READ 10-10-255 s=255,c=3,t=7,pt=0,l=0,sg=0:
TSP:MSG:BC
TSM:FPAR
TSP:MSG:SEND 10-10-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=bc:
TSM:FPAR
TSP:MSG:SEND 10-10-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=bc:
!TSM:FPAR:FAIL
!TSM:FAILURE
TSM:PDT
What does it mean? Why can't I read the serial messages?
I'm getting started and I'm researching about Mysensors. I would like some tips, please.
I know that I must set this first:
#define RF24_CE_PIN 9
#define RF24_CS_PIN 10
#define RF24_PA_LEVEL RF24_PA_MAX
#define RF24_PA_LEVEL_GW RF24_PA_LOW
#define RF24_CHANNEL 76
#define RF24_DATARATE RF24_250KBPS
#define RF24_BASE_RADIO_ID ((uint64_t)0xA8A8E1FC00LL)
#define SOFTSPI
#ifdef SOFTSPI
const uint8_t SOFT_SPI_MISO_PIN = 16;
const uint8_t SOFT_SPI_MOSI_PIN = 15;
const uint8_t SOFT_SPI_SCK_PIN = 14;
#endif
#include <MyConfig.h>
#include <MySensors.h>
And I know that in 2.0.x I don't need to set this:
.begin();
But I don't know how to define in Mysensors when it's Writing / stopListening and Reading / startListening
radio.openWritingPipe(enderecos[0]);
radio.stopListening();
openReadingPipe(1, enderecos[0]);
startListening();
Also how to Write the sensor information and Read:
radio.write(&dadosenviados, sizeof(dadosenviados));
if (radio.available())
{
while (radio.available())
{
radio.read(&dadosrecebidos, sizeof(dadosrecebidos));
}
Is this how I send the sensor information? If so, how do I read?
void presentation()
{
sendSketchInfo("Distance Sensor", "1.0");
present(CHILD_ID, S_DISTANCE);
}
Hey. I'm trying to use Mysensors, but I got these errors. Are there a specific command that I should use? I didn't find any example.
error: 'RF24' does not name a type RF24 radio(MY_RF24_CE_PIN, MY_RF24_CS_PIN);
error: 'radio' was not declared in this scope radio.begin();
@AWI Hi.
Sure, I'm going to try and then I come back here.
Thanks.
Hey!
Thanks @mfalkvidd !
I'm trying to make the module nRF24l01+ work with the micro SD card in parallell and I'm having some trouble.
The micro SD card is working, but the nRF24l01+ not.
The nRF24l01+ works fine when there's no micro SD card.
Can anyone give me a help, please!?
TX:
#include <SPI.h>
#include <RF24.h>
#define REFRESH_TIME 1000
RF24 radio (9, 10);
byte enderecos[][6] = {"1node"};
float dadosenviados[2];
// Bateria
int sensorTensaoDC = A0;
float valorTensaoDC;
int amostragem = 1000;
float mediaTotalTensaoDC = 0;
float R1 = 28000.0;
float R2 = 7600.0;
int sensorValue_aux = 0;
float voltsporUnidade = 0.004887586;// 5%1023
//Velocidade
unsigned long lastRefresh = millis();
float circMetric = 0.17;
volatile long loopCount = 0;
void setup ()
{
analogReference(DEFAULT);
pinMode(A0, INPUT);
attachInterrupt(0, speedCalc, RISING);
radio.begin();
radio.openWritingPipe(enderecos[0]);
radio.stopListening();
}
void bateria ()
{
mediaTotalTensaoDC = 0;
for(int i=0; i < amostragem ; i++)
{
valorTensaoDC = analogRead(sensorTensaoDC);
valorTensaoDC =(valorTensaoDC*voltsporUnidade);
mediaTotalTensaoDC = mediaTotalTensaoDC+ (valorTensaoDC / (R2/(R1+R2)));
delay(1);
}
dadosenviados[0] = mediaTotalTensaoDC / amostragem;
}
void velocidade ()
{
if (millis() - lastRefresh >= REFRESH_TIME)
{
detachInterrupt(0);
dadosenviados[1] = (3600*circMetric*loopCount)/(millis() - lastRefresh);
loopCount = 0;
lastRefresh = millis();
attachInterrupt(0, speedCalc, RISING);
}
}
void speedCalc()
{
loopCount++;
}
void envio ()
{
radio.write(&dadosenviados, sizeof(dadosenviados));
delay(10);
}
void loop()
{
dadosenviados[0] = 0;
dadosenviados[1] = 0;
bateria();
velocidade();
envio();
}
RX:
#include <SD.h>
#include <SPI.h>
#include <RF24.h>
#include <LiquidCrystal.h>
#define CE_PIN 9 // RF
#define CSN_PIN 10 //RF
#define SS_P 8// SD
RF24 radio (9, 10);
byte enderecos[][6] = {"1node"};
File dataFile;
LiquidCrystal lcd(3, 2, 7, 6, 5, 4);
String dadosrecebidos[2];
void setup ()
{
pinMode(CSN_PIN, OUTPUT); // RF
pinMode(CE_PIN, OUTPUT); // RF
pinMode(SS_P, OUTPUT); // SD
digitalWrite(SS_P, HIGH);
digitalWrite(CSN_PIN, HIGH);
digitalWrite(CE_PIN, HIGH);
SPI.begin();
delay(50);
digitalWrite(CSN_PIN, LOW);
digitalWrite(CE_PIN, LOW);
radio.begin();
radio.openReadingPipe(1, enderecos[0]);
radio.startListening();
digitalWrite(CSN_PIN, HIGH);
lcd.begin(20, 4);
lcd.clear();
lcd.setCursor(5, 0);
lcd.print("Teste 1.6");
delay(5000);
lcd.setCursor(3, 2);
lcd.print("Carregando...");
delay(5000);
lcd.clear();
digitalWrite(SS_P, LOW);
if (SD.begin(SS_P))
{
lcd.setCursor(0, 0);
lcd.print("Cartao presente!");
lcd.setCursor(0, 1);
lcd.print("Pronto para gravar.");
delay(5000);
lcd.setCursor(3, 3);
lcd.print("Iniciando...");
delay(5000);
}
else
{
lcd.setCursor(0, 0);
lcd.print("Insira o cartao!");
lcd.setCursor(0, 1);
lcd.print("Se ja inseriu,");
lcd.setCursor(0, 2);
lcd.print("verifique o");
lcd.setCursor(0, 3);
lcd.print("cartao");
delay(5000);
}
dataFile = SD.open("datalog.txt", FILE_WRITE);
if (dataFile)
{
dataFile.println("Tensão e velocidade");
dataFile.close();
}
else
{
dataFile.println("Erro");
}
digitalWrite(SS_P, HIGH);
}
void recebido ()
{
digitalWrite(CE_PIN, LOW);
digitalWrite(CSN_PIN, LOW);
if (radio.available())
{
while (radio.available())
{
radio.read(&dadosrecebidos, sizeof(dadosrecebidos));
}
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("TENSAO");
lcd.setCursor(7, 0);
lcd.print(dadosrecebidos[0]);
lcd.print("VOLTS");
lcd.setCursor(0, 1);
lcd.print("VELOCIDADE");
lcd.setCursor(11, 1);
lcd.print(dadosrecebidos[1]);
lcd.print("KM/H");
}
digitalWrite(CSN_PIN, HIGH);
}
void gravar()
{
digitalWrite(SS_P, LOW);
// make a string for assembling the data to log:
String dataString = ""; //this line simply erases the string
dataString += "Tensao ";
dataString += (dadosrecebidos[0]);
dataString += " VOLTS";
dataString += " / "; //puts a comma between the two bits of data
dataString += "Velocidade ";
dataString += (dadosrecebidos[1]);
dataString += " KM/H";
delay (1000);
dataFile = SD.open("datalog.txt", FILE_WRITE);
// if the file is available, write to it:
if (dataFile)
{
dataFile.println(dataString);
dataFile.close();
}
// if the file isn't open, pop up an error:
else
{
dataFile.println("Erro");
}
digitalWrite(SS_P, HIGH);
}
void loop ()
{
recebido();
gravar();
}```@mfalkvidd Thank you! I really appreciated your advices.
I'm using two Arduinos UNO and at the moment I can see battery level using a lcd and a voltage sensor module.
Now I'm going to build the nRF module, but I have a doubt about the Arduino UNO pin using SPI interface MOSI, MISO and SCK.
One UNO with nRF > pin 11, 12 and 13 / SD card > pin 11, 12 and 13
Another UNO with nRF > pin 11, 12 and 13 / lcd > pin 11, 12, 2, 3, 4 and 5
They use the same pins, what am I gonna do? Put them in parallel?
Thanks!
Hello! 
I'm a beginner and I'd like to ask you guys about the RF nRF24L01+
I want to use a hall sensor module to measure the speed and a voltage sensor module to measure the battery level of a Remote Control Car. One Arduino UNO stays on the Car to get these information of the sensors and then the RF nRF24L01+ send them to another Arduino UNO(near to the Car) that receives with another RF nRF24L01+ and display the information in a LCD 20x4.
This Remote Control Car is going to operate only in short distances(like inside a house).
Have anyone done a project similar like this? Is it too hard?
The RF nRF24L01+ operates with 2.4GHz and the remote control with 27MHZ, am I going to have problems with interferences?
Thanks a lot in advance! 