first commit

2025-03-06 11:15:32 +01:00
commit 7b30d6e298
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--- a/ESP8266_MULTIPLEXER_CD4051BE/ESP8266_MULTIPLEXER_CD4051BE.ino
+++ b/ESP8266_MULTIPLEXER_CD4051BE/ESP8266_MULTIPLEXER_CD4051BE.ino
@@ -0,0 +1,112 @@
+/*
+ ESP8266 4051 Multiplexer by Brian Lough
+ 
+ An example showing how to use a 4051 multiplexer with an esp8266
+ to connect up to 8 analog sensors.
+
+ Wiring:
+ Wemos ->  4051
+ ---------------
+ D4    ->   S0 (A)
+ D3    ->   S1 (B)
+ D2    ->   S2 (C)
+ A0    ->   Common
+ 3.3v  ->   VCC
+ G     ->   GND
+ G     ->   Inhibit
+ G     ->   VEE  
+ 
+ 4051 Option pins are then wired to whatever Analog sensors required
+
+ One thing to note: say for example if you only require 2 analog sensors,
+ You can just wire up S0(A) and connect S1 & S2 to GND and you will be 
+ able to switch between option 1 and option 2 pins.
+ Same goes for up to 4 pins (just use S0 & S1)
+*/
+
+#define MUX_A D5
+#define MUX_B D6
+#define MUX_C D7
+
+#define ANALOG_INPUT A0
+
+
+void setup() {
+  Serial.begin(9600);
+  //Deifne output pins for Mux
+  pinMode(MUX_A, OUTPUT);
+  pinMode(MUX_B, OUTPUT);     
+  pinMode(MUX_C, OUTPUT);     
+}
+
+void changeMux(int c, int b, int a) {
+  digitalWrite(MUX_A, a);
+  digitalWrite(MUX_B, b);
+  digitalWrite(MUX_C, c);
+  delay(200);
+}
+
+void loop() {
+  float value;
+    delay(200);
+  changeMux(LOW, LOW, LOW); 
+  value = readValue(); //analogRead(ANALOG_INPUT); //Value of the sensor connected Option 0 pin of Mux
+  delay(200); Serial.println(" value 1=" + String(value));
+  changeMux(LOW, LOW, HIGH);
+  value = readValue(); //analogRead(ANALOG_INPUT); //Value of the sensor connected Option 1 pin of Mux
+  delay(200); Serial.println(" value 2=" + String(value));
+  
+//  changeMux(LOW, HIGH, LOW);
+//  value = analogRead(ANALOG_INPUT); //Value of the sensor connected Option 2 pin of Mux
+//  delay(200); Serial.println("value 3=" + String(value));
+//
+//  changeMux(LOW, HIGH, HIGH);
+//  value = analogRead(ANALOG_INPUT); //Value of the sensor connected Option 3 pin of Mux
+//  delay(200); Serial.println("value 4=" + String(value));
+//
+//  changeMux(HIGH, LOW, LOW);
+//  value = analogRead(ANALOG_INPUT); //Value of the sensor connected Option 4 pin of Mux
+//  delay(200); Serial.println("value 5=" + String(value));
+//
+//  changeMux(HIGH, LOW, HIGH);
+//  value = analogRead(ANALOG_INPUT); //Value of the sensor connected Option 5 pin of Mux
+//  delay(200); Serial.println("value 6=" + String(value));
+//
+  changeMux(HIGH, HIGH, LOW);
+  value = readValue(); //analogRead(ANALOG_INPUT); //Value of the sensor connected Option 6 pin of Mux
+  delay(200); Serial.println(" value 7=" + String(value));
+
+//  changeMux(HIGH, HIGH, HIGH);
+//  value = analogRead(ANALOG_INPUT); //Value of the sensor connected Option 7 pin of Mux
+//  delay(200); Serial.println("value 8=" + String(value));
+  delay(1000);
+}
+
+int readValue()
+{
+ int vmin = 1024;
+ int vmax = 0;
+ int max_bcl = 200;
+ int RawValue = 0;
+ for (int i = 0; i < max_bcl; i++) {
+   int value = analogRead(ANALOG_INPUT);
+   if (value >= 0) {
+     RawValue += value;
+     vmax = max(value,vmax);
+     vmin = min(value,vmin);
+   } else {
+     i--;
+   }
+   delay(1); 
+   
+ }
+   RawValue = RawValue / max_bcl; 
+ 
+ Serial.print("rawValue = " ); 
+ Serial.print(RawValue);
+ Serial.print(" min = " ); 
+ Serial.print(vmin);
+ Serial.print(" max = " ); 
+ Serial.println(vmax);
+ return vmax;
+}