Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes a Piezo Speaker, a Load Cell, an LCD2004 I2C Module, an HX711 Bridge Sensor Interface, and an ESP32 microcontroller. The circuit is designed to interface a load cell with an ESP32, display data on an LCD, and provide audio feedback through a Piezo Speaker.

Component List

1. Piezo Speaker

   • Description: A simple piezoelectric speaker used for generating sound.
   • Pins: pin1, pin2

2. Load Cell - Red/white/black/green

   • Description: A load cell sensor used for measuring weight.
   • Pins: E+, A-, E-, A+

3. MKE-M08 LCD2004 I2C Module

   • Description: An LCD module with I2C interface for displaying data.
   • Pins: GND, 5V, SDA, SCL

4. HX711 - Bridge Sensor Interface

   • Description: An interface module for connecting bridge sensors like load cells.
   • Pins: E+, E-, A-, A+, B-, B+, GND - GROUND, DATA (OUT), SCK - CLOCK (IN), 3.3/3.5V Supply

5. ESP32

   • Description: A powerful microcontroller with 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, BOOT

Wiring Details

Piezo Speaker

• pin2 is connected to ESP32 D26
• pin1 is connected to ESP32 GND and HX711 GND - GROUND

Load Cell - Red/white/black/green

• E+ is connected to HX711 E+
• E- is connected to HX711 E-
• A- is connected to HX711 A-
• A+ is connected to HX711 A+

MKE-M08 LCD2004 I2C Module

• GND is connected to ESP32 GND
• 5V is connected to ESP32 VIN
• SDA is connected to ESP32 D21
• SCL is connected to ESP32 D22

HX711 - Bridge Sensor Interface

• 3.3/3.5V Supply is connected to ESP32 3V3
• GND - GROUND is connected to Piezo Speaker pin1 and ESP32 GND
• SCK - CLOCK (IN) is connected to ESP32 D19
• DATA (OUT) is connected to ESP32 D23
• E+ is connected to Load Cell E+
• E- is connected to Load Cell E-
• A- is connected to Load Cell A-
• A+ is connected to Load Cell A+

ESP32

• D26 is connected to Piezo Speaker pin2
• GND is connected to Piezo Speaker pin1, HX711 GND - GROUND, and MKE-M08 LCD2004 I2C Module GND
• VIN is connected to MKE-M08 LCD2004 I2C Module 5V
• 3V3 is connected to HX711 3.3/3.5V Supply
• D19 is connected to HX711 SCK - CLOCK (IN)
• D21 is connected to MKE-M08 LCD2004 I2C Module SDA
• D22 is connected to MKE-M08 LCD2004 I2C Module SCL
• D23 is connected to HX711 DATA (OUT)

Code

No code is provided for this circuit.