Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an ESP32 microcontroller, various sensors, an LED, a transistor, a resistor, and a buck converter. The circuit is designed to interface with multiple sensors and control an LED through a transistor. The ESP32 serves as the central processing unit, collecting data from sensors and controlling the LED.

Component List

1. ESP 32 DEVKIT V1 (30 pins)

   • Description: A development board featuring the ESP32 microcontroller, which includes Wi-Fi and Bluetooth capabilities.
   • 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

2. DHT 11

   • Description: A basic, low-cost digital temperature and humidity sensor.
   • Pins: VCC, GND, DATA

3. LED: Two Pin (white)

   • Description: A white LED with two pins.
   • Pins: cathode, anode

4. PZEM004t

   • Description: A module used for measuring voltage, current, power, and energy.
   • Pins: VCC, RX, TX, GND, IN, OUT

5. bc547

   • Description: A general-purpose NPN transistor.
   • Pins: collector, base, Emitter

6. Resistor

   • Description: A resistor with a resistance of 10k Ohms.
   • Pins: pin1, pin2
   • Properties: Resistance = 10k Ohms

7. Buck converter

   • Description: A DC-DC converter that steps down voltage.
   • Pins: IN+, IN-, OUT+, OUT-

8. MQ135

   • Description: A gas sensor used for detecting air quality.
   • Pins: VCC, GND, A0, D0

Wiring Details

ESP 32 DEVKIT V1 (30 pins)

• D34 is connected to A0 of MQ135.
• GND is connected to:
  • OUT- of Buck converter
  • Emitter of bc547
  • GND of DHT 11
  • GND of PZEM004t
  • GND of MQ135
• VIN is connected to:
  • OUT+ of Buck converter
  • anode of LED: Two Pin (white)
  • VCC of DHT 11
  • VCC of PZEM004t
  • VCC of MQ135
• D15 is connected to DATA of DHT 11.
• D4 is connected to pin2 of Resistor.
• RX2 is connected to TX of PZEM004t.
• TX2 is connected to RX of PZEM004t.

DHT 11

• VCC is connected to OUT+ of Buck converter.
• GND is connected to GND of ESP 32 DEVKIT V1 (30 pins).
• DATA is connected to D15 of ESP 32 DEVKIT V1 (30 pins).

LED: Two Pin (white)

• anode is connected to OUT+ of Buck converter.
• cathode is connected to collector of bc547.

PZEM004t

• VCC is connected to OUT+ of Buck converter.
• GND is connected to GND of ESP 32 DEVKIT V1 (30 pins).
• RX is connected to TX2 of ESP 32 DEVKIT V1 (30 pins).
• TX is connected to RX2 of ESP 32 DEVKIT V1 (30 pins).

bc547

• collector is connected to cathode of LED: Two Pin (white).
• base is connected to pin1 of Resistor.
• Emitter is connected to GND of ESP 32 DEVKIT V1 (30 pins).

Resistor

• pin1 is connected to base of bc547.
• pin2 is connected to D4 of ESP 32 DEVKIT V1 (30 pins).

Buck converter

• OUT- is connected to GND of ESP 32 DEVKIT V1 (30 pins).
• OUT+ is connected to VIN of ESP 32 DEVKIT V1 (30 pins).

MQ135

• VCC is connected to OUT+ of Buck converter.
• GND is connected to GND of ESP 32 DEVKIT V1 (30 pins).
• A0 is connected to D34 of ESP 32 DEVKIT V1 (30 pins).

Code

No code is provided for this circuit.