Circuit Documentation

Summary

This document provides a detailed overview of a circuit that integrates various components including an RFID reader, a temperature and humidity sensor, a load cell with an amplifier, LEDs, a buzzer, an LCD display, and an Arduino UNO with WiFi capabilities. The circuit is powered by a 12V power supply regulated through a buck converter. The Arduino UNO serves as the central microcontroller, interfacing with all other components.

Component List

1. RFID-RC522

   • Description: RFID reader module
   • Pins: VCC (3.3V), RST, GND, IRQ, MISO, MOSI, SCK, SDA

2. AHT10

   • Description: Temperature and humidity sensor
   • Pins: Vcc, Gnd, SCL, SDA

3. Buck Converter

   • Description: Voltage regulator
   • Pins: IN+, IN-, OUT+, OUT-

4. 12V Power Supply

   • Description: Power source
   • Pins: +, -

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

   • Description: Weight sensor
   • Pins: E+, A-, E-, A+

6. SparkFun Load Cell Amplifier - HX711

   • Description: Load cell signal amplifier
   • Pins: GND, CLK, DAT, VCC, YLW, GRN, WHT, BLK, RED, B-, B+

7. LED: Two Pin (red)

   • Description: Red LED
   • Pins: cathode, anode

8. LED: Two Pin (yellow)

   • Description: Yellow LED
   • Pins: cathode, anode

9. 16x2 I2C LCD

   • Description: LCD display
   • Pins: GND, VCC, SDA, SCL

10. LED: Two Pin (green)

    • Description: Green LED
    • Pins: cathode, anode

11. Buzzer Module

    • Description: Buzzer for audio signals
    • Pins: GND, Vcc, I/O

12. Arduino UNO+WiFi R3 ATmega328P+Node MCU ESP8266 CH340G

    • Description: Microcontroller with WiFi capabilities
    • Pins: KORF, RST, 3.5v, 5.0v, GND, VIN, A0, A1, A2, A3, A4, A5, SCL, SDA, ARET, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, TX, RX

Wiring Details

RFID-RC522

• RST connected to RST of Arduino UNO
• VCC (3.3V) connected to 3.5v of Arduino UNO and OUT+ of Buck Converter
• GND connected to GND of Arduino UNO and OUT- of Buck Converter
• SDA connected to SDA of Arduino UNO

AHT10

• Vcc connected to 3.5v of Arduino UNO and OUT+ of Buck Converter
• Gnd connected to GND of Arduino UNO and OUT- of Buck Converter
• SCL connected to SCL of Arduino UNO
• SDA connected to SDA of Arduino UNO

Buck Converter

• IN+ connected to + of 12V Power Supply
• IN- connected to - of 12V Power Supply
• OUT+ connected to 3.5v of Arduino UNO, Vcc of AHT10, and VCC (3.3V) of RFID-RC522
• OUT- connected to GND of Arduino UNO, Gnd of AHT10, and GND of RFID-RC522

12V Power Supply

• + connected to IN+ of Buck Converter
• - connected to IN- of Buck Converter

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

• GND connected to GND of Arduino UNO
• VCC connected to 5.0v of Arduino UNO
• DAT connected to 3 of Arduino UNO
• CLK connected to 2 of Arduino UNO
• RED connected to E+ of Load Cell
• WHT connected to A- of Load Cell
• BLK connected to E- of Load Cell
• GRN connected to A+ of Load Cell

LED: Two Pin (red)

• cathode connected to GND of Arduino UNO
• anode connected to 7 of Arduino UNO

LED: Two Pin (yellow)

• cathode connected to GND of Arduino UNO
• anode connected to 6 of Arduino UNO

16x2 I2C LCD

• GND connected to GND of Arduino UNO
• VCC connected to 5.0v of Arduino UNO
• SDA connected to SDA of Arduino UNO
• SCL connected to SCL of Arduino UNO

LED: Two Pin (green)

• cathode connected to GND of Arduino UNO
• anode connected to 5 of Arduino UNO

Buzzer Module

• GND connected to GND of Arduino UNO
• Vcc connected to 5.0v of Arduino UNO
• I/O connected to 8 of Arduino UNO

Arduino UNO+WiFi R3 ATmega328P+Node MCU ESP8266 CH340G

• RST connected to RST of RFID-RC522
• 3.5v connected to Vcc of AHT10 and VCC (3.3V) of RFID-RC522
• 5.0v connected to VCC of 16x2 I2C LCD, VCC of SparkFun Load Cell Amplifier - HX711, and Vcc of Buzzer Module
• GND connected to GND of 16x2 I2C LCD, GND of SparkFun Load Cell Amplifier - HX711, Gnd of AHT10, GND of RFID-RC522, GND of Buck Converter, cathode of LED (green), cathode of LED (red), cathode of LED (yellow), and GND of Buzzer Module
• SCL connected to SCL of 16x2 I2C LCD and SCL of AHT10
• SDA connected to SDA of 16x2 I2C LCD, SDA of AHT10, and SDA of RFID-RC522
• 8 connected to I/O of Buzzer Module
• 7 connected to anode of LED (red)
• 6 connected to anode of LED (yellow)
• 5 connected to anode of LED (green)
• 3 connected to DAT of SparkFun Load Cell Amplifier - HX711
• 2 connected to CLK of SparkFun Load Cell Amplifier - HX711

Code

No code provided.