Esp Grow Controller

Using an Esp32 to control various different devices for a GrowTent.

Hardware used:

1. Esp32 1x
2. Gravity: 2-Channel I2C DAC Module (0-10V) 2x
3. SD CARD Reader
4. ENS160ATH21 Sensor or BME280
5. 12v stepdown to 5v

Pins

I2C SDA 21 SCL 22 SDCARD CS 5 MOSI 23 SCK 18 MISO 19

Features:

1. Can control 2 different Fans(in/out) based on Temperature and Humidity and apply a speed difference to keep a negative pressure
2. Set a nightmode to reduce the fan speed for that time range
3. Automatic turn light on/off and apply sunrise/set
4. Log humidity, temperature, co2, .... to sdcard, it create files in that structure /year/month/day/hour.csv (/2024/03/05/12.csv) and store a value every sec
5. webinterface with a chart

Notes about DAC Module

Every devices that use the same Power Source as the Esp is connected to, only need the PWM signal and no GND. Extern powered devices like the lamp(12v) or the big fan(24v) need a connection to GND on the DAC!

Build and Flash

Prerequisites

• PlatformIO Core (or the VS Code PlatformIO extension):
  pip install platformio (or follow instructions at https://platformio.org/install).
• USB cable to connect your ESP‑32.

1. Update Environment (optional)

If your ESP‑32 is on a different IP, edit src/environments/environment.ts:

export const environment = {
  production: false,
  apiBaseUrl: 'http://<ESP_IP>',   // <-- host of the web server
  apiPort: 80,                     // <-- http_port value
};

2. Build Firmware

Build Flags & Configuration

The firmware can be tailored at compile time via the following -D flags in platformio.ini.
Uncomment a flag by removing the leading semicolon (;) or pass it directly with pio run -d.

Flag	Purpose
USE_SDCARD=1	Enable SD‑card logging. The firmware will create /year/month/day/hour.csv files on the card.
SENSOR_ENS160AHT21=1	Use an ENS160 / AHT21 sensor for temperature, humidity and CO₂ measurement.
i2c_aht_addr=56	I²C address of the AHT21 when SENSOR_ENS160AHT21 is enabled.
i2c_ens_add=83	I²C address of the ENS160 sensor when SENSOR_ENS160AHT21 is enabled.
SENSOR_BME280=1	Use a BME280 sensor for temperature, humidity and pressure.
BME_I2C_ADD=119	I²C address of the BME280.
I2C_SDA=21	GPIO pin used as I²C SDA (default 21).
I2C_SCL=22	GPIO pin used as I²c SCL (default 22).
i2c_pwn_addr=95	I²C address of the fan PWM controller.
i2c_light_addr=94	I²C address of the light PWM controller.
time_zone_hour_utc_offset=1	Offset in hours from UTC for sunrise/sunset calculations.
MYSSID=""	SSID used by the ESP‑32 when acting as an access point (if configured).
PW=""	Password for that AP.
http_port=80	HTTP port on which the web server listens.
GOVEE_BTH5179=1	Enable support for a specific device (e.g., GOVEE BTH‑5179).

Tip: If you add new hardware, just create a corresponding flag and guard its code with #ifdef.
After editing platformio.ini, rebuild with

Open a terminal in the project root and run:

pio run -e esp32dev

This compiles the firmware defined by platformio.ini and all libraries listed under lib_deps.

3. Flash to ESP‑32

Connect your ESP‑32, identify the serial port (e.g., /dev/ttyUSB0 on Linux or COM5 on Windows). Then execute:

pio run --target upload -e esp32dev -d <serial_port>

Alternatively, using the PlatformIO IDE:

1. Click PlatformIO: Build.
2. After a successful build, click Upload.

4. Upload SPIFFS (if needed)

If your firmware uses a filesystem and you want to upload it separately:

pio run --target uploadfs -e esp32dev

Notes

• The platformio.ini file contains the board definition (esp32dev) and library dependencies.
• If you need a larger flash size, uncomment or modify the board_build.flash_size setting in platformio.ini.