Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an ESP8266 NodeMCU microcontroller, a load cell with an amplifier, a Bluetooth module, LEDs, a buzzer, and a battery case. The circuit is designed to interface with various sensors and actuators, providing wireless communication capabilities and visual/auditory feedback.

Component List

ESP8266 NodeMCU

• Description: A low-cost Wi-Fi microcontroller with GPIO, ADC, and other features.
• Pins: D0, D1, D2, D3, D4, 3V3, GND, D5, D6, D7, D8, RX, TX, A0, RSV, SD3, SD2, SD1, CMD, SD0, CLK, EN, RST, VIN

My Battery Case

• Description: A battery holder for two 18650 Li-ion batteries.
• Pins: +, -

18650 Li-ion Battery x 2

• Description: Rechargeable lithium-ion batteries.
• Pins: +, -

Load Cell - Red/white/black/green

• Description: A sensor to measure weight or force.
• Pins: E+, A-, E-, A+

SparkFun Load Cell Amplifier - HX711

• Description: An amplifier for load cells, providing digital output.
• Pins: GND, CLK, DAT, VCC, YLW, GRN, WHT, BLK, RED, B-, B+

HC-05 Bluetooth Module

• Description: A Bluetooth module for wireless communication.
• Pins: Key, VCC, GND, TXD, RXD, State

LED: Two Pin (green)

• Description: A green LED for visual indication.
• Pins: cathode, anode

LED: Two Pin (red)

• Description: A red LED for visual indication.
• Pins: cathode, anode

Buzzer

• Description: An audio device for sound alerts.
• Pins: PIN, GND

Wiring Details

ESP8266 NodeMCU

• D4 connected to DAT of SparkFun Load Cell Amplifier - HX711
• D5 connected to CLK of SparkFun Load Cell Amplifier - HX711
• D6 connected to anode of LED: Two Pin (red)
• D7 connected to PIN of Buzzer
• RX connected to TXD of HC-05 Bluetooth Module
• TX connected to RXD of HC-05 Bluetooth Module
• GND connected to:
  • cathode of LED: Two Pin (red)
  • GND of SparkFun Load Cell Amplifier - HX711
  • - of My Battery Case
  • GND of Buzzer
  • GND of HC-05 Bluetooth Module
  • cathode of LED: Two Pin (green)
• VIN connected to:
  • VCC of SparkFun Load Cell Amplifier - HX711
  • + of My Battery Case
  • VCC of HC-05 Bluetooth Module
  • anode of LED: Two Pin (green)

My Battery Case

• + connected to VIN of ESP8266 NodeMCU
• - connected to GND of ESP8266 NodeMCU

Load Cell - Red/white/black/green

• E+ connected to RED of SparkFun Load Cell Amplifier - HX711
• A- connected to WHT of SparkFun Load Cell Amplifier - HX711
• E- connected to BLK of SparkFun Load Cell Amplifier - HX711
• A+ connected to GRN of SparkFun Load Cell Amplifier - HX711

SparkFun Load Cell Amplifier - HX711

• DAT connected to D4 of ESP8266 NodeMCU
• CLK connected to D5 of ESP8266 NodeMCU
• GND connected to GND of ESP8266 NodeMCU
• VCC connected to VIN of ESP8266 NodeMCU
• RED connected to E+ of Load Cell - Red/white/black/green
• WHT connected to A- of Load Cell - Red/white/black/green
• BLK connected to E- of Load Cell - Red/white/black/green
• GRN connected to A+ of Load Cell - Red/white/black/green

HC-05 Bluetooth Module

• TXD connected to RX of ESP8266 NodeMCU
• RXD connected to TX of ESP8266 NodeMCU
• GND connected to GND of ESP8266 NodeMCU
• VCC connected to VIN of ESP8266 NodeMCU

LED: Two Pin (green)

• cathode connected to GND of ESP8266 NodeMCU
• anode connected to VIN of ESP8266 NodeMCU

LED: Two Pin (red)

• cathode connected to GND of ESP8266 NodeMCU
• anode connected to D6 of ESP8266 NodeMCU

Buzzer

• PIN connected to D7 of ESP8266 NodeMCU
• GND connected to GND of ESP8266 NodeMCU

Code

No code provided for this circuit.