Here's the circuit:
And here's the code (the code is written for a 16 channel mux, since it's for a project that should support those, it shouldn't matter here though):
Code: Select all
#include <Wire.h>
#include <Adafruit_ADS1X15.h>
#define POTDELAY 50
Adafruit_ADS1115 ads;
const int numMuxCtlPins = 4;
const int numPots = 2;
unsigned int pots[numPots];
int muxCtlPins[numMuxCtlPins] = {2, 3, 4, 7};
int muxCtlValues[numMuxCtlPins] = { 1, 3, 7, 15 };
void readPots() {
int16_t results;
Serial.print("pots");
for (int pot = 0; pot < numPots; pot++) {
for(int pin = 0; pin < numMuxCtlPins; pin++) {
digitalWrite(muxCtlPins[pin], (pot & muxCtlValues[pin]) >> pin);
}
delayMicroseconds(POTDELAY);
results = ads.readADC_Differential_0_1();
// add 32768 to offset the value to start from 0
uint32_t uResults = results + 0x8000;
pots[pot] = uResults;
Serial.print(" ");
Serial.print(responsivePots[pot]);
}
Serial.println();
}
void setup(void)
{
for (int i = 0; i < 4; i++) {
pinMode(muxCtlPins[i], OUTPUT);
digitalWrite(muxCtlPins[i], LOW);
}
// 2x gain +/- 2.048V 1 bit = 1mV 0.0625mV
ads.setGain(GAIN_TWO);
ads.begin();
Serial.begin(115200);
while (!Serial);
}
void loop(void)
{
readPots();
}
