ESP8266 Community Forum

Posted: **Fri Jan 15, 2016 5:39 pm**

im getting lazy lately (getting older), so instead of etching pcb, im using adapter boards for my prototype

Posted: **Fri Jan 15, 2016 5:58 pm**

ESP8266 + 12bit ADC (MCP3204)

Test video:

with a 4.096Vdc reference voltage, we can get 1mV resolution.

MCP3204 schematic (from MikroC Click ADC)

MCP3204 Sketch from Playgorund: http://playground.arduino.cc/Code/MCP3208

Code: Select all

#define SELPIN 10 //Selection Pin 
#define DATAOUT 11//MOSI 
#define DATAIN  12//MISO 
#define SPICLOCK  13//Clock 
int readvalue; 

void setup(){ 
 //set pin modes 
 pinMode(SELPIN, OUTPUT); 
 pinMode(DATAOUT, OUTPUT); 
 pinMode(DATAIN, INPUT); 
 pinMode(SPICLOCK, OUTPUT); 
 //disable device to start with 
 digitalWrite(SELPIN,HIGH); 
 digitalWrite(DATAOUT,LOW); 
 digitalWrite(SPICLOCK,LOW); 

 Serial.begin(9600); 
} 

int read_adc(int channel){
  int adcvalue = 0;
  byte commandbits = B11000000; //command bits - start, mode, chn (3), dont care (3)

  //allow channel selection
  commandbits|=((channel-1)<<3);

  digitalWrite(SELPIN,LOW); //Select adc
  // setup bits to be written
  for (int i=7; i>=3; i--){
    digitalWrite(DATAOUT,commandbits&1<<i);
    //cycle clock
    digitalWrite(SPICLOCK,HIGH);
    digitalWrite(SPICLOCK,LOW);    
  }

  digitalWrite(SPICLOCK,HIGH);    //ignores 2 null bits
  digitalWrite(SPICLOCK,LOW);
  digitalWrite(SPICLOCK,HIGH);  
  digitalWrite(SPICLOCK,LOW);

  //read bits from adc
  for (int i=11; i>=0; i--){
    adcvalue+=digitalRead(DATAIN)<<i;
    //cycle clock
    digitalWrite(SPICLOCK,HIGH);
    digitalWrite(SPICLOCK,LOW);
  }
  digitalWrite(SELPIN, HIGH); //turn off device
  return adcvalue;
}


void loop() { 
 readvalue = read_adc(1); 
 Serial.println(readvalue,DEC); 
 readvalue = read_adc(2); 
 Serial.println(readvalue,DEC); 
 Serial.println(" "); 
 delay(250); 
}

MCP3204 were taken out from my old MCP3204 + ENC28J60 board

Posted: **Fri Jan 15, 2016 6:26 pm**

next would be adding USB Host to ESP8266. for my bluetooth dualshock or just a flashdrive.

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