Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes various sensors, a relay module, an LCD screen, and an ESP32 microcontroller. The circuit is designed to monitor environmental parameters and control a relay module based on the sensor inputs. The ESP32 microcontroller serves as the central processing unit, interfacing with all the sensors and the relay module.

Component List

1. PZEM004t

   • Description: Energy monitoring module
   • Pins: VCC, RX, TX, GND, IN, OUT

2. Rain Gauge

   • Description: Measures rainfall
   • Pins: SIGNAL, VIN, GND

3. Battery

   • Description: Power source
   • Pins: +, -

4. LCD screen 16x2 I2C

   • Description: Display module
   • Pins: SCL, SDA, VCC, GND

5. Adafruit VEML7700

   • Description: Ambient light sensor
   • Pins: VIN, 3.3V, GND, SCL, SDA

6. ESP32

   • Description: Microcontroller
   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, VIN, 3V3, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, BOOT

7. Relay module 5v-30v

   • Description: Relay module for switching
   • Pins: common contact, normally open, normally closed, trigger, V-, V+

8. Bulb

   • Description: Load controlled by the relay
   • Pins: GND, power

Wiring Details

PZEM004t

• VCC: Connected to 3.3V (ESP32)
• GND: Connected to GND (ESP32)
• TX: Connected to D15 (ESP32)
• RX: Connected to D2 (ESP32)

PZEM004t

• VCC: Connected to 3.3V (ESP32)
• GND: Connected to GND (ESP32)
• TX: Connected to D4 (ESP32)
• RX: Connected to D5 (ESP32)

PZEM004t

• VCC: Connected to 3.3V (ESP32)
• GND: Connected to GND (ESP32)
• TX: Connected to D19 (ESP32)
• RX: Connected to D18 (ESP32)

Rain Gauge

• SIGNAL: Connected to D34 (ESP32)
• VIN: Connected to 3.3V (ESP32)
• GND: Connected to GND (ESP32)

Battery

• +: Connected to common contact (Relay module)
• -: Connected to GND (Bulb)

LCD screen 16x2 I2C

• SCL: Connected to D26 (ESP32)
• SDA: Connected to D27 (ESP32)
• VCC: Connected to 3.3V (ESP32)
• GND: Connected to GND (ESP32)

Adafruit VEML7700

• VIN: Connected to 3.3V (ESP32)
• GND: Connected to GND (ESP32)
• SCL: Connected to D21 (ESP32)
• SDA: Connected to D22 (ESP32)

ESP32

• D34: Connected to SIGNAL (Rain Gauge)
• D35: Connected to trigger (Relay module)
• D26: Connected to SCL (LCD screen 16x2 I2C)
• D27: Connected to SDA (LCD screen 16x2 I2C)
• 3V3: Connected to VCC (PZEM004t, Rain Gauge, Relay module, LCD screen 16x2 I2C, Adafruit VEML7700)
• GND: Connected to GND (PZEM004t, Rain Gauge, Relay module, LCD screen 16x2 I2C, Adafruit VEML7700)
• D15: Connected to TX (PZEM004t)
• D2: Connected to RX (PZEM004t)
• D4: Connected to TX (PZEM004t)
• D5: Connected to RX (PZEM004t)
• D18: Connected to RX (PZEM004t)
• D19: Connected to TX (PZEM004t)
• D21: Connected to SCL (Adafruit VEML7700)
• D22: Connected to SDA (Adafruit VEML7700)

Relay module 5v-30v

• trigger: Connected to D35 (ESP32)
• V+: Connected to 3.3V (ESP32)
• V-: Connected to GND (ESP32)
• common contact: Connected to + (Battery)
• normally open: Connected to power (Bulb)

Bulb

• power: Connected to normally open (Relay module)
• GND: Connected to - (Battery)

Code

No code provided.