Hi All,
I am trying to connect GS3 Decagon Sensor http://library.metergroup.com/Manuals/20429_GS3_Web.pdf with ESP-WROOM-32 30 PIN Development Board together but failed. I have tired connect with Arduino Uno and it was a successful connection but not with ESP32.
Is there any solution to connect the GS3 Decagon and ESP32 together?.
The code below are the code for GS3 to Arduino Uno.
/* code reads Decagon GS3 sensor output to the serial terminal.
WHITE wire: power supply/excitation, connected to 5v pin
RED wire: data line, connected to Arduino pin 2 (or another interrupt-capable pin)
bare wire: connected to GND
*/
#include <SDISerial.h>
#define INPUT_SIZE 30
#define NUMSAMPLES 5
#define DATA_PIN 2
#define INVERTED 1
int sensorDelay = 1000;
// bulk density used to calculate porewater conductivity (g/cm3)
float bulkDens = 0.4;
// mineral density assumed to be 2.65 Mg/m3 (used
// in porewater calculation from eq. 3 from GS-3 manual)
float theta = 1 - (bulkDens / 2.65);
char* samples;
SDISerial sdi_serial_connection(DATA_PIN, INVERTED);
void setup() {
sdi_serial_connection.begin();
Serial.begin(921600);
Serial.println("Start Initialized\n");
delay(1000);
}
void loop() {
uint8_t i;
// arrays to hold reps
float dielectric[NUMSAMPLES];
float soilMoist[NUMSAMPLES];
float degC[NUMSAMPLES];
float bulkEC[NUMSAMPLES];
float porewaterEC[NUMSAMPLES];
float solutionEC[NUMSAMPLES];
// mean values
float dielMean = 0.0;
float soilMoistMean = 0.0;
float degCMean = 0.0;
float bulkECMean = 0.0;
float porewaterECMean = 0.0;
float solutionECMean = 0.0;
// take repeated samples
for (i = 0; i < NUMSAMPLES; i++) {
//char* response = get_measurement(); // get measurement data
samples = get_measurement();
while (strlen(samples) < 5) {
samples = get_measurement();
}
// first term is the sensor address (irrelevant to me)
char* term1 = strtok(samples, "+");
// second term is the dielectric conductivity & soil moisture
term1 = strtok(NULL, "+");
dielectric[i] = atof(term1);
term1 = strtok(NULL, "+");
degC[i] = atof(term1);
term1 = strtok(NULL, "+");
bulkEC[i] = atof(term1);
// see eqs. 1 + 2 from GS3 manual (dS/m)
porewaterEC[i] = ((80.3 - 0.37 * (degC[i] - 20)) * bulkEC[i] / 1000) / (dielectric[i] - 6);
if (bulkEC[i] < 5) {
soilMoist[i] = (5.89 * pow(10.0, -6.0) * pow(dielectric[i], 3.0)) - (7.62 * pow(10.0, -4.0) *
pow(dielectric[i], 2.0)) + (3.67 * pow(10.0, -2.0) * dielectric[i]) - (7.53 * pow(10.0, -2.0));
} else {
soilMoist[i] = 0.118 * sqrt(dielectric[i]) -0.117;
}
// calculate EC of solution removed from a saturated soil paste,
// according to Decagon GS3 manual
// see page 8 of GS3 manual (eq. 4)
solutionEC[i] = (bulkEC[i] / 1000 * soilMoist[i]) / theta;
// sum with each iteration
dielMean += dielectric[i];
soilMoistMean += soilMoist[i];
degCMean += degC[i];
bulkECMean += bulkEC[i];
porewaterECMean += porewaterEC[i];
solutionECMean += solutionEC[i];
}
// Average readings for each parameter
dielMean /= NUMSAMPLES;
soilMoistMean /= NUMSAMPLES;
degCMean /= NUMSAMPLES;
bulkECMean /= (NUMSAMPLES / 0.001);
porewaterECMean /= NUMSAMPLES;
solutionECMean /= NUMSAMPLES;
// Serial.print("dielectric: ");
// Serial.println(dielMean, 3);
Serial.print("VWC (m3/m3): ");
Serial.println(soilMoistMean, 3);
Serial.print("Degree (C): ");
Serial.println(degCMean, 1);
Serial.print("bulk EC (dS/m): ");
Serial.println(bulkECMean, 3);
// Serial.print("Solution EC (dS/m): ");
// Serial.println(solutionECMean, 4);
// Serial.print("porewater EC (dS/m): ");
// Serial.println(porewaterECMean, 4);
delay(sensorDelay);
Serial.println("\n");
}
char* get_measurement(){
// function by Joran Beasley: https://github.com/joranbeasley/SDISerial/blob/master/examples/SDISerialExample/SDISerialExample.ino
char* service_request = sdi_serial_connection.sdi_query("?M!", sensorDelay);
//you can use the time returned above to wait for the service_request_complete
char* service_request_complete = sdi_serial_connection.wait_for_response(sensorDelay);
// 1 second potential wait, but response is returned as soon as it's available
return sdi_serial_connection.sdi_query("?D0!", sensorDelay);
}