Room Temperature Sensor Design

flux

1:23

Below is the complete wiring summary that connects all the components in your design:
ESP32-WROOM-32D (U1):
  • Power:
    • Connect the ESP32's 3.3V output to all VDD connections of the DS18B20 and LCD (verify the LCD’s voltage rating; if it requires 5V, adjust accordingly).
    • Tie the ESP32's Ground pin to the common Ground.
  • DS18B20 Sensor (U2):
    • VDD (pin 3): Connect to the ESP32’s 3.3V line.
    • GND (pin 1): Connect to the common Ground.
    • DQ (pin 2): Connect to an ESP32 GPIO (suggested IO15). Also, connect a 4.7kΩ pull-up resistor (R1) between this DQ line and the 3.3V supply.
  • 4.7kΩ Pull-Up Resistor (R1):
    • One terminal goes to the DS18B20 DQ (data) pin.
    • The other terminal goes to the ESP32's 3.3V supply.
  • 16x2 LCD Display Module (LCD1 – WC1602A):
    • Power Connections:
      • VDD (pin 2): Connect to the same 3.3V (or 5V if your module requires it) supply used by the ESP32.
      • VSS (pin 1): Connect to the common Ground.
    • Control Signals (for 4-bit operation):
      • RS (pin 4): Connect to an ESP32 GPIO (suggested IO13).
      • R/W (pin 5): Tie directly to Ground.
      • E (pin 6): Connect to an ESP32 GPIO (suggested IO14).
    • Data Lines (4-bit mode):
      • Connect the LCD data pins (D4 to D7; typically pins 11–14) to chosen ESP32 GPIOs. For example, you might use:
        • LCD D4 → ESP32 IO27
        • LCD D5 → ESP32 IO26
        • LCD D6 → ESP32 IO25
        • LCD D7 → ESP32 IO33
  • Common Ground:
    • Use a dedicated Ground component to interconnect the ground pins of the ESP32, DS18B20, LCD, and any other modules.
With these net connections:
  • The DS18B20's power (VDD) and data are correctly interfaced with the ESP32, with the essential 4.7kΩ pull-up ensuring proper one-wire communication.
  • The LCD receives its power, signal, and data connections from the ESP32.
  • All components share a common ground for proper signal reference.
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