I'm try to read some value from a soil NPK sensor using RS485 Modbus e Arduino uno.

I menage to sent the request msg and I got the response but now i don't know how to read the response in order to get the information I need.

the following code sent the request to get moisture value to the sensor:

#include <SoftwareSerial.h> #define RE 8 #define DE 7 const byte msg[] = {0x01,0x03, 0x00, 0x00, 0x00, 0x01, 0x84, 0x0A}; byte values[11]; SoftwareSerial mod(2, 3); void setup() { Serial.begin(4800); mod.begin(4800); pinMode(RE, OUTPUT); pinMode(DE, OUTPUT); delay(500); } void loop() { test(); } byte test(){ digitalWrite(DE,HIGH); digitalWrite(RE,HIGH); delay(10); Serial.flush(); if(mod.write(msg,sizeof(msg))==8){ digitalWrite(DE,LOW); digitalWrite(RE,LOW); for(byte i=0;i<7;i++){ Serial.println(mod.read(),HEX);   values[i] = mod.read(); } Serial.println(); Serial.flush(); delay(4000); } } 

My response is folloing bits:

1 2 F1 50 FFFFFFFF FFFFFFFF FFFFFFFF 1 2 E4 9F FFFFFFFF FFFFFFFF FFFFFFFF 1 2 F1 50 FFFFFFFF FFFFFFFF FFFFFFFF 

looking at the datasheet below there should be a data area in the message response from the sensor.

how to convert this bit info to my humidty value.

my be this example from the datasheet can help

I'm try to read some value from a soil NPK sensor using RS485 Modbus e Arduino uno.

I menage to sent the request msg and I got the response but now i don't know how to read the response in order to get the information I need.

the following code sent the request to get moisture value to the sensor:

#include <SoftwareSerial.h> #define RE 8 #define DE 7 const byte msg[] = {0x01,0x03, 0x00, 0x00, 0x00, 0x01, 0x84, 0x0A}; byte values[11]; SoftwareSerial mod(2, 3); void setup() { Serial.begin(4800); mod.begin(4800); pinMode(RE, OUTPUT); pinMode(DE, OUTPUT); delay(500); } void loop() { test(); } byte test(){ digitalWrite(DE,HIGH); digitalWrite(RE,HIGH); delay(10); Serial.flush(); if(mod.write(msg,sizeof(msg))==8){ digitalWrite(DE,LOW); digitalWrite(RE,LOW); for(byte i=0;i<7;i++){  values[i] = mod.read(); Serial.print(values[i],HEX); } Serial.println(); Serial.flush(); delay(4000); } } 

My response is following bits:

114BA4134 1D5112A671 341D2119B A61341D51 12A671341 E811BBAB13 41DB114BA4 1341DB11 4BA41341DB 114BA4134 1E311CA691 341C911EB A11341E31 1CA691341 EC11FA6A13 41E4117BA8 

looking at the datasheet below there should be a data area in the message response from the sensor.

how to convert this bit info to my humidty value.

my be this example from the datasheet can help