1-Wire Soil Moisture Sensor demo Arduino/ESP32/Raspberry PI

Read 1-Wire soil moisture sensor by ONLY ONE I/O , including soil moisture, temperature, and EC (Conductivity).

Nov 13, 2021

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environmental sensing

home automation

soil moisture sensor

Devices & Components

Arduino Uno Rev3

MT05S - Soil Moisture/Temperature/EC Sensor

ESP32S

Raspberry Pi 3 Model B

Hardware & Tools

OneWire Library by Paul Stoffregen

Software & Tools

Arduino IDE

Project description

Code

Arduino Demo

c_cpp

This is demostration sourcecode for Arduino UNO R3, ESP32 DoIt DevKit V1, NodeMCU 32S, to read soil moisture, temperature, and EC (Conductivity) from MT05S sensor using SINGLE I/O.

1#include <OneWire.h>
2
3#define TEST_MT05S_ONEWIRE_CONVERT_T            1
4
5//   Define a 1-Wire signal pin (a 2.0K~5.1K pull-up resistor is necessary)
6// Change   according to your wiring and connection.
7OneWire  ds(2);  
8
9void setup(void)   {
10  Serial.begin(9600);
11}
12
13void loop(void) {
14  Serial.println("//-------------------------");
15   Serial.println("// Start Testing MT05S     ");
16  Serial.println("//-------------------------");
17   uint8_t i;
18
19#ifdef TEST_MT05S_ONEWIRE_CONVERT_T
20  //--------------------------------------------
21   // Tested - Convert T and Read Scratchpad
22  // Attention: 
23  //--------------------------------------------
24   Serial.print("Test Function Command- Convert T [0x44]  & Read Scratchpad [0xBE]:   \
25");
26  byte scratchpad[9];
27
28  Serial.print("Convert T [0x44]: ");
29   ds.reset();//Send RESET
30  ds.skip();//Send ROM Command-Skip ROM
31  ds.write(0x44);//Send   Function command- convert T
32
33  //Wait conversion done (Whether to pull down   the DQ line during operation can be configured in scratchpad CONFIG0-Bit3- SensorPowerMode)
34   while(ds.read_bit() == 0)
35  {
36    delay(10);
37    Serial.print(".");
38   }
39  Serial.print("Conversion Done\
40");
41
42  Serial.print("Read Scratchpad   [0xBE]: ");
43  ds.reset();//Send RESET
44  ds.skip();//Send ROM Command-Skip   ROM
45  ds.write(0xBE);//Send Function command- Read Scratchpad
46  for (int i   = 0; i < 9; i++) {// we need 9 bytes
47    scratchpad[i] = ds.read();
48  }
49   for (int i = 0; i < 9; i++) {// we need 9 bytes
50    Serial.print(scratchpad[i],HEX);
51     Serial.print(" ");
52  }
53  Serial.print(" CrcCalculated=");
54  Serial.print(OneWire::crc8(scratchpad,   8),HEX);
55  Serial.println();
56
57  if(OneWire::crc8(scratchpad, 8) == scratchpad[8])
58   {
59    int16_t temperature = makeWord(scratchpad[0],scratchpad[1]);
60    int16_t   moisture = makeWord(scratchpad[2],scratchpad[3]);
61    int16_t conductivity =   makeWord(scratchpad[4],scratchpad[5]);
62    Serial.print("TEMP(C) = "); Serial.print(temperature/100.00);
63     Serial.print("  MOISTURE(%) = "); Serial.print(moisture/100.00);
64    Serial.print("   CONDUCTIVITY(ms/cm) = "); Serial.print(conductivity/1000.00);
65    Serial.print("   CONFIG0 = "); Serial.print(scratchpad[6],HEX);
66    Serial.print("  CONFIG1   = "); Serial.print(scratchpad[7],HEX);
67    Serial.print("  CRC8 = "); Serial.print(scratchpad[8],HEX);
68   }
69  else
70  {
71    Serial.print("CRC ERROR!");
72  }
73  Serial.print("\
74\
75");
76   
77  delay(1000);
78#endif
79}

#include <OneWire.h>

#define TEST_MT05S_ONEWIRE_CONVERT_T            1

//   Define a 1-Wire signal pin (a 2.0K~5.1K pull-up resistor is necessary)
// Change   according to your wiring and connection.
OneWire  ds(2);  

void setup(void)   {
  Serial.begin(9600);
}

void loop(void) {
  Serial.println("//-------------------------");
   Serial.println("// Start Testing MT05S     ");
  Serial.println("//-------------------------");
   uint8_t i;

#ifdef TEST_MT05S_ONEWIRE_CONVERT_T
  //--------------------------------------------
   // Tested - Convert T and Read Scratchpad
  // Attention: 
  //--------------------------------------------
   Serial.print("Test Function Command- Convert T [0x44]  & Read Scratchpad [0xBE]:   \
");
  byte scratchpad[9];

  Serial.print("Convert T [0x44]: ");
   ds.reset();//Send RESET
  ds.skip();//Send ROM Command-Skip ROM
  ds.write(0x44);//Send   Function command- convert T

  //Wait conversion done (Whether to pull down   the DQ line during operation can be configured in scratchpad CONFIG0-Bit3- SensorPowerMode)
   while(ds.read_bit() == 0)
  {
    delay(10);
    Serial.print(".");
   }
  Serial.print("Conversion Done\
");

  Serial.print("Read Scratchpad   [0xBE]: ");
  ds.reset();//Send RESET
  ds.skip();//Send ROM Command-Skip   ROM
  ds.write(0xBE);//Send Function command- Read Scratchpad
  for (int i   = 0; i < 9; i++) {// we need 9 bytes
    scratchpad[i] = ds.read();
  }
   for (int i = 0; i < 9; i++) {// we need 9 bytes
    Serial.print(scratchpad[i],HEX);
     Serial.print(" ");
  }
  Serial.print(" CrcCalculated=");
  Serial.print(OneWire::crc8(scratchpad,   8),HEX);
  Serial.println();

  if(OneWire::crc8(scratchpad, 8) == scratchpad[8])
   {
    int16_t temperature = makeWord(scratchpad[0],scratchpad[1]);
    int16_t   moisture = makeWord(scratchpad[2],scratchpad[3]);
    int16_t conductivity =   makeWord(scratchpad[4],scratchpad[5]);
    Serial.print("TEMP(C) = "); Serial.print(temperature/100.00);
     Serial.print("  MOISTURE(%) = "); Serial.print(moisture/100.00);
    Serial.print("   CONDUCTIVITY(ms/cm) = "); Serial.print(conductivity/1000.00);
    Serial.print("   CONFIG0 = "); Serial.print(scratchpad[6],HEX);
    Serial.print("  CONFIG1   = "); Serial.print(scratchpad[7],HEX);
    Serial.print("  CRC8 = "); Serial.print(scratchpad[8],HEX);
   }
  else
  {
    Serial.print("CRC ERROR!");
  }
  Serial.print("\
\
");
   
  delay(1000);
#endif
}

Arduino Demo

c_cpp

This is demostration sourcecode for Arduino UNO R3, ESP32 DoIt DevKit V1, NodeMCU 32S, to read soil moisture, temperature, and EC (Conductivity) from MT05S sensor using SINGLE I/O.

1#include <OneWire.h>
2
3#define TEST_MT05S_ONEWIRE_CONVERT_T            1
4
5//  Define a 1-Wire signal pin (a 2.0K~5.1K pull-up resistor is necessary)
6// Change  according to your wiring and connection.
7OneWire  ds(2);  
8
9void setup(void)  {
10  Serial.begin(9600);
11}
12
13void loop(void) {
14  Serial.println("//-------------------------");
15  Serial.println("// Start Testing MT05S     ");
16  Serial.println("//-------------------------");
17  uint8_t i;
18
19#ifdef TEST_MT05S_ONEWIRE_CONVERT_T
20  //--------------------------------------------
21  // Tested - Convert T and Read Scratchpad
22  // Attention: 
23  //--------------------------------------------
24  Serial.print("Test Function Command- Convert T [0x44]  & Read Scratchpad [0xBE]:  \
25");
26  byte scratchpad[9];
27
28  Serial.print("Convert T [0x44]: ");
29  ds.reset();//Send RESET
30  ds.skip();//Send ROM Command-Skip ROM
31  ds.write(0x44);//Send  Function command- convert T
32
33  //Wait conversion done (Whether to pull down  the DQ line during operation can be configured in scratchpad CONFIG0-Bit3- SensorPowerMode)
34  while(ds.read_bit() == 0)
35  {
36    delay(10);
37    Serial.print(".");
38  }
39  Serial.print("Conversion Done\
40");
41
42  Serial.print("Read Scratchpad  [0xBE]: ");
43  ds.reset();//Send RESET
44  ds.skip();//Send ROM Command-Skip  ROM
45  ds.write(0xBE);//Send Function command- Read Scratchpad
46  for (int i  = 0; i < 9; i++) {// we need 9 bytes
47    scratchpad[i] = ds.read();
48  }
49  for (int i = 0; i < 9; i++) {// we need 9 bytes
50    Serial.print(scratchpad[i],HEX);
51    Serial.print(" ");
52  }
53  Serial.print(" CrcCalculated=");
54  Serial.print(OneWire::crc8(scratchpad,  8),HEX);
55  Serial.println();
56
57  if(OneWire::crc8(scratchpad, 8) == scratchpad[8])
58  {
59    int16_t temperature = makeWord(scratchpad[0],scratchpad[1]);
60    int16_t  moisture = makeWord(scratchpad[2],scratchpad[3]);
61    int16_t conductivity =  makeWord(scratchpad[4],scratchpad[5]);
62    Serial.print("TEMP(C) = "); Serial.print(temperature/100.00);
63    Serial.print("  MOISTURE(%) = "); Serial.print(moisture/100.00);
64    Serial.print("  CONDUCTIVITY(ms/cm) = "); Serial.print(conductivity/1000.00);
65    Serial.print("  CONFIG0 = "); Serial.print(scratchpad[6],HEX);
66    Serial.print("  CONFIG1  = "); Serial.print(scratchpad[7],HEX);
67    Serial.print("  CRC8 = "); Serial.print(scratchpad[8],HEX);
68  }
69  else
70  {
71    Serial.print("CRC ERROR!");
72  }
73  Serial.print("\
74\
75");
76  
77  delay(1000);
78#endif
79}

#include <OneWire.h>

#define TEST_MT05S_ONEWIRE_CONVERT_T            1

//  Define a 1-Wire signal pin (a 2.0K~5.1K pull-up resistor is necessary)
// Change  according to your wiring and connection.
OneWire  ds(2);  

void setup(void)  {
  Serial.begin(9600);
}

void loop(void) {
  Serial.println("//-------------------------");
  Serial.println("// Start Testing MT05S     ");
  Serial.println("//-------------------------");
  uint8_t i;

#ifdef TEST_MT05S_ONEWIRE_CONVERT_T
  //--------------------------------------------
  // Tested - Convert T and Read Scratchpad
  // Attention: 
  //--------------------------------------------
  Serial.print("Test Function Command- Convert T [0x44]  & Read Scratchpad [0xBE]:  \
");
  byte scratchpad[9];

  Serial.print("Convert T [0x44]: ");
  ds.reset();//Send RESET
  ds.skip();//Send ROM Command-Skip ROM
  ds.write(0x44);//Send  Function command- convert T

  //Wait conversion done (Whether to pull down  the DQ line during operation can be configured in scratchpad CONFIG0-Bit3- SensorPowerMode)
  while(ds.read_bit() == 0)
  {
    delay(10);
    Serial.print(".");
  }
  Serial.print("Conversion Done\
");

  Serial.print("Read Scratchpad  [0xBE]: ");
  ds.reset();//Send RESET
  ds.skip();//Send ROM Command-Skip  ROM
  ds.write(0xBE);//Send Function command- Read Scratchpad
  for (int i  = 0; i < 9; i++) {// we need 9 bytes
    scratchpad[i] = ds.read();
  }
  for (int i = 0; i < 9; i++) {// we need 9 bytes
    Serial.print(scratchpad[i],HEX);
    Serial.print(" ");
  }
  Serial.print(" CrcCalculated=");
  Serial.print(OneWire::crc8(scratchpad,  8),HEX);
  Serial.println();

  if(OneWire::crc8(scratchpad, 8) == scratchpad[8])
  {
    int16_t temperature = makeWord(scratchpad[0],scratchpad[1]);
    int16_t  moisture = makeWord(scratchpad[2],scratchpad[3]);
    int16_t conductivity =  makeWord(scratchpad[4],scratchpad[5]);
    Serial.print("TEMP(C) = "); Serial.print(temperature/100.00);
    Serial.print("  MOISTURE(%) = "); Serial.print(moisture/100.00);
    Serial.print("  CONDUCTIVITY(ms/cm) = "); Serial.print(conductivity/1000.00);
    Serial.print("  CONFIG0 = "); Serial.print(scratchpad[6],HEX);
    Serial.print("  CONFIG1  = "); Serial.print(scratchpad[7],HEX);
    Serial.print("  CRC8 = "); Serial.print(scratchpad[8],HEX);
  }
  else
  {
    Serial.print("CRC ERROR!");
  }
  Serial.print("\
\
");
  
  delay(1000);
#endif
}

Raspberry Pi Demo

python

This is demostration sourcecode for Raspberry Pi 3B, to read soil moisture, temperature, and EC (Conductivity) from MT05S sensor using SINGLE I/O.

1#!/usr/bin/python3
2import os,time
3
4ROMCODE='28-060504030201'
5device_file  ='/sys/bus/w1/devices/'+ROMCODE+'/w1_slave'
6print("//----------------------------------------------------------------");
7print("//  Start Testing MT05S");
8print("// Rom Code= " + ROMCODE);
9print("// Change  ROM CODE FOR YOUR SENSOR !!!!!!");
10print("//----------------------------------------------------------------");
11
12def  read_raw():
13    f = open(device_file,'r')
14    lines = f.readlines()
15    f.close()
16    return lines
17
18def read_mt05s():
19    lines = read_raw()
20    while  lines[0].strip()[-3:] != 'YES':
21        print('Incorrect Data')
22        time.sleep(0.2)
23        lines = read_raw()
24    byteList = lines[1].rsplit((' '))
25    if len(byteList)  >9 :
26        soilTempHi8=int(byteList[0], 16)
27        soilTempLo8=int(byteList[1],  16)
28        soilTemp = soilTempHi8*256+soilTempLo8
29
30        soilMoistureHi8=int(byteList[2],  16)
31        soilMoistureLo8=int(byteList[3], 16)
32        soilMoisture = soilMoistureHi8*256+soilMoistureLo8
33
34        soilECHi8=int(byteList[4], 16)
35        soilECLo8=int(byteList[5], 16)
36        soilEC = soilECHi8*256+soilECLo8
37    return [ soilTemp, soilMoisture,  soilEC  ]
38
39while True:
40    values = read_mt05s()
41    print('Soil Temp(C)=  %.2f  Moisture(%%)= %.2f  EC(ms/cm)= %.3f' %(values[0]/100.0,  values[1]/100.0,  values[2]/1000.0))
42    time.sleep(1)

#!/usr/bin/python3
import os,time

ROMCODE='28-060504030201'
device_file  ='/sys/bus/w1/devices/'+ROMCODE+'/w1_slave'
print("//----------------------------------------------------------------");
print("//  Start Testing MT05S");
print("// Rom Code= " + ROMCODE);
print("// Change  ROM CODE FOR YOUR SENSOR !!!!!!");
print("//----------------------------------------------------------------");

def  read_raw():
    f = open(device_file,'r')
    lines = f.readlines()
    f.close()
    return lines

def read_mt05s():
    lines = read_raw()
    while  lines[0].strip()[-3:] != 'YES':
        print('Incorrect Data')
        time.sleep(0.2)
        lines = read_raw()
    byteList = lines[1].rsplit((' '))
    if len(byteList)  >9 :
        soilTempHi8=int(byteList[0], 16)
        soilTempLo8=int(byteList[1],  16)
        soilTemp = soilTempHi8*256+soilTempLo8

        soilMoistureHi8=int(byteList[2],  16)
        soilMoistureLo8=int(byteList[3], 16)
        soilMoisture = soilMoistureHi8*256+soilMoistureLo8

        soilECHi8=int(byteList[4], 16)
        soilECLo8=int(byteList[5], 16)
        soilEC = soilECHi8*256+soilECLo8
    return [ soilTemp, soilMoisture,  soilEC  ]

while True:
    values = read_mt05s()
    print('Soil Temp(C)=  %.2f  Moisture(%%)= %.2f  EC(ms/cm)= %.3f' %(values[0]/100.0,  values[1]/100.0,  values[2]/1000.0))
    time.sleep(1)

Downloadable files

Application Note for Wiring, Coding and demostration

https://github.com/INFWIN/mt05s-demo

Application Note for Wiring, Coding and demostration

https://github.com/INFWIN/mt05s-demo

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