ESP32 Forum

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#include "driver/gpio.h"
#include "driver/adc.h"

#define MAX_INPUTCHARS 256

unsigned long time0,time1,time2; 
float c,null0;
byte kn,mk,i;
bool waiting;
char incomingByte;
char incomingByteArray[MAX_INPUTCHARS] = {0};
int measurement;
float capValue;
unsigned long startTime, currentTime, duration;

#define PIN_Discharge   32                  // Discharge via 100 ohm resistor
#define PIN_PicoCharge  33                  // Charge via 1k resistor
#define PIN_NanoCharge  25                  // Charge via 10k resistor
#define PIN_MicroCharge 26                  // Charge via 100k resistor
#define PIN_ADC         ADC1_CHANNEL_6       // ADC1 channel 6 is GPIO34

#define TAU_VALUE       2580                // 63.21% of 4095

#define Micro_R         1000                // 1 k-ohm
#define Nano_R1         10000               // 10 k-ohm
#define Nano_R2         100000              // 100 k-ohm
#define Pico_R1         1000000             // 1 M-ohm

#define MaxDuration     10000000            // hard limit = 10 seconds

void setup() {
  // put your setup code here, to run once:
  mk = 0;

  // make all pins High-Z

  
  Serial.begin(115200);                                                   // Arduino IDE serial port for debugging @ 115.2 kBaud

  while (!Serial) continue;                                               // wait for serial port to connect. Needed for native USB
  delay(200);
  
  Serial.println("ESP32 C-Meter v1.0");
  
  Command_Init();                                                         // set up Command interpreter
}

void loop() {
  Command_Parse();                                                        // parse command string and execute command
}


unsigned int arrayIndex;
bool userConnected;

// set state and wait for user input

void Command_Init() {
  userConnected = false;
  Serial.setTimeout(500);                                         // wait max 500 ms
}

// Parse the serial input auto-terminate after serial time-out
// If the command is valid, execute
// If the command is invalid, echo the bad command, empty the serial buffer and return to loop

void Command_Parse() {
  
  if(Serial.available()){                                         // check the serial port
    memset(incomingByteArray, NULL, sizeof(incomingByteArray));   // clear the local char buffer
    Serial.readBytesUntil('\n', incomingByteArray, 20);           // read up to 20 chars, wait max 500 ms

    while(Serial.available() > 0){                                // discard extra chars after '\n'
      Serial.read();
    }
  
    // incomingByteArray contains the user command
    Serial.print("\nincomingByteArray = ");                       // just checking ...
    Serial.print(incomingByteArray);
  }
  else
    return;                                                       // back to main loop
    
    
  if(strcasecmp(incomingByteArray, "C") == 0){                    // connect ?
    userConnected = true;                                         // update connection status

    ResetAllPins();                                               // initialize all PINs to High-Z
    
    Serial.println("\nUser Connected!");                          // send response
    return;                                                       // back to main loop
  }
}


void ResetAllPins(){
  Serial.println("\nResetting PINs");
  pinMode(PIN_MicroCharge, INPUT);
  pinMode(PIN_PicoCharge, INPUT);
  pinMode(PIN_NanoCharge, INPUT);
  pinMode(PIN_Discharge, INPUT);
  pinMode(PIN_ADC, INPUT);
}

Code: Select all

void ResetAllPins(){
  Serial.println("\nResetting PINs");
  pinMode(PIN_MicroCharge, INPUT);
  pinMode(PIN_PicoCharge, INPUT);
  pinMode(PIN_NanoCharge, INPUT);
  pinMode(PIN_Discharge, INPUT);
  pinMode(PIN_ADC, INPUT);
}