Smart Plant Monitor

ATmega328P-based system that auto-waters plants and controls UV grow lights based on soil moisture.

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How It Works

Sensor	Condition	Action
Soil Moisture (A1)	ADC > 400 (dry)	Pump relay ON
Water Level (A2)	ADC > 100	Red LED ON
Water Level (A2)	ADC ≤ 100	Green LED ON
Timer (8 hrs)	Within window	UV light ON

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Pin Map

Signal	Arduino Pin	AVR Pin
Soil Moisture	A1	PC1 / ADC1
Water Level	A2	PC2 / ADC2
Pump Relay	D8	PB0
UV Light Relay	D7	PD7
RGB Red	D9	PB1
RGB Blue	D10	PB2
RGB Green	D12	PB4

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PCB

Full schematic and layout → images/

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Flash the Firmware

Install toolchain (Ubuntu):

sudo apt install gcc-avr avr-libc avrdude

Build & flash (USBasp):

cd firmware
make
make flash

Flash via Arduino bootloader:

# Set PORT in Makefile first (e.g. /dev/ttyUSB0)
make flash-arduino

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UART Output

Connect at 9600 baud, 8N1 to monitor live readings:

=== Smart Plant Monitor Boot ===
Moisture: 612
Water Level: 87