Circuit Documentation

Summary

This circuit involves an ESP32-CAM microcontroller, a 74HC595 shift register, multiple 4066 analog switches, resistors, and LEDs. The ESP32-CAM controls the shift register, which in turn controls the analog switches. The analog switches are used to control the LEDs through resistors. The circuit is powered by a 9V battery.

Component List

1. 74HC595 Shift Register

   • Description: 8-bit serial-in, serial or parallel-out shift register with output latches.
   • Pins: Q0-Q7, DS (DATA), OE (Enable), ST_CP (RCLK), SH_CP (SRCLK), MR (SRCLR), Q7' (QH), GND, VCC

2. ESP32-CAM

   • Description: A low-cost microcontroller with integrated Wi-Fi and Bluetooth, featuring a camera module.
   • Pins: 5V, GND, IO0, IO2, IO4, IO12, IO13, IO14, IO15, IO16, VOT, VOR, VCC, 3V3

3. 4066 Analog Switch

   • Description: Quad bilateral switch.
   • Pins: X1 (Input 1), Y1 (Output 1), X2 (Input 2), Y2 (Output 2), A1 (Control A), A2 (Control B), A3 (Control C), A4 (Control D), X3 (Output 3), Y3 (Input 3), X4 (Output 4), Y4 (Input 4), GND, VCC

4. 9V Battery

   • Description: Power source for the circuit.
   • Pins: +, -

5. Resistor

   • Description: 200 Ohms resistor.
   • Pins: pin1, pin2

6. LED: Two Pin (red)

   • Description: Red LED.
   • Pins: cathode, anode

Wiring Details

74HC595 Shift Register

• Q0: Connected to A1 (Control A) of 4066
• Q1: Connected to A2 (Control B) of 4066
• Q2: Connected to A3 (Control C) of 4066
• Q3: Connected to A4 (Control D) of 4066
• Q4: Connected to A1 (Control A) of another 4066
• Q5: Connected to A2 (Control B) of another 4066
• Q6: Connected to A3 (Control C) of another 4066
• Q7: Connected to A4 (Control D) of another 4066
• DS (DATA): Connected to IO12 of ESP32-CAM
• OE (Enable): Connected to GND
• ST_CP (RCLK): Connected to IO13 of ESP32-CAM
• SH_CP (SRCLK): Connected to IO15 of ESP32-CAM
• MR (SRCLR): Connected to 5V
• GND: Connected to GND
• VCC: Connected to 5V

ESP32-CAM

• 5V: Connected to 5V
• GND: Connected to GND
• IO12: Connected to DS (DATA) of 74HC595
• IO13: Connected to ST_CP (RCLK) of 74HC595
• IO15: Connected to SH_CP (SRCLK) of 74HC595

4066 Analog Switch

• A1 (Control A): Connected to Q0 of 74HC595
• A2 (Control B): Connected to Q1 of 74HC595
• A3 (Control C): Connected to Q2 of 74HC595
• A4 (Control D): Connected to Q3 of 74HC595
• X1 (Input 1): Connected to 9V Battery +
• Y1 (Output 1): Connected to pin2 of Resistor
• X2 (Input 2): Connected to 9V Battery +
• Y2 (Output 2): Connected to pin2 of Resistor
• X3 (Output 3): Connected to pin2 of Resistor
• Y3 (Input 3): Connected to 9V Battery +
• X4 (Output 4): Connected to pin2 of Resistor
• Y4 (Input 4): Connected to 9V Battery +
• GND: Connected to GND
• VCC: Connected to 5V

9V Battery

• +: Connected to X1, X2, Y3, Y4 of 4066
• -: Connected to cathode of all LEDs

Resistor

• pin1: Connected to anode of LED
• pin2: Connected to Y1, Y2, X3, X4 of 4066

LED: Two Pin (red)

• cathode: Connected to 9V Battery -
• anode: Connected to pin1 of Resistor

Code Documentation

sketch.ino

int latchPin = 13;  // ST_CP
int clockPin = 15;  // SH_CP
int dataPin = 12;   // DS

void setup() {
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);

  Serial.begin(9600);
  Serial.print("Start...");
  setSwitch(B00000000);
}

void setSwitch(byte status) {
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, status);
  digitalWrite(latchPin, HIGH);
}

void loop() {
  setSwitch(B01001000);
  delay(1000);
  setSwitch(B10110111);
  delay(1000);
}

This code initializes the ESP32-CAM to control the 74HC595 shift register. The setSwitch function sets the state of the shift register, which in turn controls the analog switches. The loop function alternates the state of the switches every second.