Circuit Documentation

Summary

This circuit involves an Arduino Nano microcontroller interfacing with multiple AHT10 temperature and humidity sensors, a WiFi module (ESP8266-01), a serial-enabled 16x2 LCD, and a couple of rocker switches. Power management is handled using a Mini 360 Buck Converter and a Step Down Module. The Arduino Nano is programmed to manage these components and facilitate communication between them.

Component List

1. Arduino Nano

   • Description: A small, complete, and breadboard-friendly board based on the ATmega328P.
   • Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

2. AHT10

   • Description: A temperature and humidity sensor.
   • Pins: Vcc, Gnd, SCL, SDA

3. Mini 360 Buck Converter

   • Description: A step-down voltage converter.
   • Pins: IN-, OUT-, OUT+, IN+

4. Step Down Module

   • Description: A module to step down voltage from 24V to 5V.
   • Pins: 24v IN+, GND, 12v IN+, 5v OUT+, 5v OUT-

5. WiFi Module ESP8266-01

   • Description: A WiFi module for wireless communication.
   • Pins: RX, GPIO0, GPIO2, GND, +3V3, Reset, CH-PD Chip power down, TX

6. SparkFun Serial Basic Breakout - CH340G

   • Description: A USB to serial communication module.
   • Pins: None

7. Serial Enabled 16x2 LCD - Black on Green 5V

   • Description: A 16x2 character LCD display.
   • Pins: GND, RX, VDD, RS, R/W, E, DB4, DB5, DB6, DB7, BL+, PGM, PGC, PGD, VPP

8. Rocker Switch

   • Description: A simple on/off switch.
   • Pins: 1, 2

Wiring Details

Arduino Nano

• D2: Connected to SDA of AHT10
• D3: Connected to SCL of AHT10
• D4: Connected to SDA of AHT10
• D5: Connected to SCL of AHT10
• D6: Connected to SDA of AHT10
• D7: Connected to SCL of AHT10
• D8: Connected to RX of WiFi module ESP8266-01
• D9: Connected to TX of WiFi module ESP8266-01
• D10: Connected to RX of Serial Enabled 16x2 LCD
• D12/MISO: Connected to pin 1 of Rocker Switch
• D13/SCK: Connected to pin 1 of Rocker Switch
• VIN: Connected to OUT+ of Mini 360 Buck Converter
• GND: Connected to GND of AHT10, Serial Enabled 16x2 LCD, Rocker Switch, WiFi module ESP8266-01, Mini 360 Buck Converter

AHT10

• SDA: Connected to D2, D4, D6 of Arduino Nano
• SCL: Connected to D3, D5, D7 of Arduino Nano
• Gnd: Connected to GND of Arduino Nano
• Vcc: Connected to 5V of Arduino Nano

Mini 360 Buck Converter

• IN-: Connected to GND of Step Down Module
• OUT-: Connected to GND of Arduino Nano
• OUT+: Connected to VIN of Arduino Nano
• IN+: Connected to 24v IN+ of Step Down Module

Step Down Module

• GND: Connected to IN- of Mini 360 Buck Converter
• 5v OUT-: Connected to GND of Step Down Module
• 24v IN+: Connected to IN+ of Mini 360 Buck Converter
• 5v OUT+: Connected to IN+ of Mini 360 Buck Converter

WiFi Module ESP8266-01

• RX: Connected to D8 of Arduino Nano
• TX: Connected to D9 of Arduino Nano
• GND: Connected to GND of Arduino Nano
• +3V3: Connected to 5V of Arduino Nano

Serial Enabled 16x2 LCD

• RX: Connected to D10 of Arduino Nano
• GND: Connected to GND of Arduino Nano
• VDD: Connected to 5V of Arduino Nano

Rocker Switch

• Pin 1: Connected to D12/MISO, D13/SCK of Arduino Nano
• Pin 2: Connected to GND of Arduino Nano

Documented Code

Arduino Nano Code (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Documentation (documentation.txt)

This documentation provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and the code used in the Arduino Nano.