Hi, I’m trying to make it work the ADC LTC1867 with the ESP32 in arduino IDE.
I tried to use a function (as I have in an sketch to do it with the MCP3208), by the same principle, let me share the code
#include "ADC.h"
#define DATAOUT 5//MOSI
#define DATAIN 18//MISO
#define SPICLOCK 19//Clock
void setup() {
Serial.begin(115200); // put your setup code here, to run once:
Serial.println("Serial port started");
pinMode(17, OUTPUT);
pinMode(16, OUTPUT);
pinMode(DATAOUT, OUTPUT);
pinMode(DATAIN, INPUT);
pinMode(SPICLOCK, OUTPUT);
digitalWrite(17, HIGH);
digitalWrite(16, HIGH);
digitalWrite(DATAOUT, LOW);
digitalWrite(SPICLOCK, LOW);
}
void loop() {
for (int i = 0; i <= 7; i++)
{
read_adc( 17 , i);
read_adc( 16 , i);
}
delay(1000);
}
int read_adc(byte SELPIN, int channel)
{
int adcvalue = 0;
byte commandbits = 0b1000010; //command bits - start, mode, chn (3), dont care (3)
digitalWrite(SELPIN, LOW); //According datasheet device needs a little HIGH pulse
digitalWrite(SELPIN, LOW);
digitalWrite(SELPIN, LOW);
digitalWrite(SELPIN, LOW);
digitalWrite(SELPIN, LOW);
digitalWrite(SELPIN, HIGH);
digitalWrite(SELPIN, HIGH);
digitalWrite(SELPIN, HIGH);
digitalWrite(SELPIN, HIGH);
digitalWrite(SELPIN, HIGH);
digitalWrite(SELPIN, LOW);
Serial.print("Selpin: ");
Serial.print(SELPIN);
Serial.print(" Channel: ");
Serial.print(channel);
Serial.print(" ");
byte aux1 = channel & 1; // get the last bit
aux1 = aux1<<5; // move the bit to the its word position
channel = channel & 6; //to make last bit 0 if it is not
channel = channel << 2;
aux1 |= channel;
commandbits |= aux1;
// // setup bits to be written
for (int i = 7; i >= 0; i--)
{
bool aux = commandbits & 1 << i;
Serial.print(aux);
digitalWrite(DATAOUT, aux);
//cycle clock
digitalWrite(SPICLOCK, HIGH);
digitalWrite(SPICLOCK, HIGH);
digitalWrite(SPICLOCK, HIGH);
digitalWrite(SPICLOCK, HIGH);
digitalWrite(SPICLOCK, HIGH);
digitalWrite(SPICLOCK, LOW);
digitalWrite(SPICLOCK, LOW);
digitalWrite(SPICLOCK, LOW);
digitalWrite(SPICLOCK, LOW);
digitalWrite(SPICLOCK, LOW);
digitalWrite(SPICLOCK, LOW);
}
Serial.print(" ");
//read bits from adc
for (int i = 15; i >= 0; i--)
{
adcvalue += digitalRead(DATAIN) << i;
// cycle clock
digitalWrite(SPICLOCK, HIGH);
digitalWrite(SPICLOCK, HIGH);
digitalWrite(SPICLOCK, HIGH);
digitalWrite(SPICLOCK, HIGH);
digitalWrite(SPICLOCK, LOW);
digitalWrite(SPICLOCK, LOW);
digitalWrite(SPICLOCK, LOW);
digitalWrite(SPICLOCK, LOW);
}
digitalWrite(SELPIN, HIGH); //turn off device
Serial.println(adcvalue);
//int adcvalue = random(2047, 4095);
return adcvalue;
}
The words I am using to interrogate the ADC are:
//CH0 1 0 0 0 0 1 0
//CH1 1 1 0 0 0 1 0
//CH2 1 0 0 1 0 1 0
//CH3 1 1 0 1 0 1 0
//CH4 1 0 1 0 0 1 0
//CH5 1 1 1 0 0 1 0
/CH6 1 0 1 1 0 1 0
//CH7 1 1 1 1 0 1 0
I want single channel, unipolar, no sleep mode
Just used many “digitalWrite…” to avoid speed issues, (it works with the mcp3208 fine).
The answer I receive is a 0, in eight chanels, both ADC, it should show a value around to the mid range.
Here is the link to the datasheet:
Hope you may help me.