2 layers79 × 30 mm
LIA
JGAguado/LIA
Low-power pet tracking platform built around Meshtastic and LoRa mesh networking
81 parts29
2 layers80 × 129.1 mm
Smart Plant
JGAguado/Smart_Plant303The Smart Plant is a board that can be plugged directly on the soil, close to the plant, that allows the measurement of the environment (soil moisture, environment temperature & illuminance), and presents the information on an ePaper display.
- Size
- 80 × 129.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 75
- Nets
- 53
- Pads
- 294
- Tracks, vias
- 575, 116
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 13 Apr 2022
- Updated
- 27 Oct 2026
Overview
Smart Plant is an open-source printed circuit board by JGAguado, from the JGAguado/Smart_Plant repository on GitHub. It is a 2-layer board of 80 × 129.1 mm with 75 parts on 53 nets, routed with 575 tracks and 116 vias.
It is built around the ESP32-S2-MINI-1-N4R2, AHT20 and VEML7700-TR, with the MAX17048G+T10, RT9080-33GJ5 and TP4056 among its other parts. Its parts include 25 capacitors, 21 resistors, 8 diodes, 7 ICs and 3 connectors. It belongs with the lEDs and displays and sensors and measurement boards and the ESP32 boards of this library.
Main components
11
ESP32-S2-MINI-1-N4R2
SMD-65P-40℃~+85℃ -97dBm 19.5dBm 2.4GHz 310mA 3V~3.6V 63mA ESP32-S2FH4 Chip On-board PCB Antenna Support USB interface UART、SPI、I2C、I2S、USB SMD-65P WiFi Modules ROHSEspressif SystemsWiFi Modules
AHT20
SMD-40℃~+120℃ 0%RH~100%RH 2.2V~5.5V 20bit 570uA I2C ±0.3℃ ±2%RH SMD Temperature and Humidity Sensor ROHSAosong ElecTemperature And Humidity Sensor
VEML7700-TR
SMD-4P-25℃~+85℃ 120klx 16bit 2.35mm 2.5V~3.6V 3mm 6.8mm I2C Light Intensity Low power/sleep mode、Spectral correction/filtering、High dynamic range measurement、Adjustable gain control、Interrupt/event trigger、Built-in temperature compensation SMD-4P Ambient Light Sensors ROHSVishay IntertechnologyAmbient Light Sensors
MAX17048G+T10
DFN-8-EP(2x2)-40℃~+85℃ 1 2.5V~4.5V 3uA I2C Lithium Battery Not supported Not supported DFN-8-EP(2x2) Battery Management ROHSMaxim Integrated (Analog Devices)Battery Management
RT9080-33GJ5
TSOT-23-5-40℃~+125℃@(Tj) 1 2uA 3.3V 360mV@(600mA) 42uVrms 5.5V 600mA 75dB@(1kHz) Fixed Over Current Protection、Over Temperature Protection、Enable Positive TSOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSRichtek TechVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
TP4056
ESOP-8-40℃~+85℃ 1 1A 35uA 4.2V 4V~6.5V Charging IC Lithium Battery Support Support 恒流充电、恒压充电、涓流充电、自动再充电、充电终止、可编程充电电流、软启动、欠压锁定 ESOP-8 Battery Management ROHSUMWBattery Management
SS14
SMA(DO-214AC)-55℃~+150℃ 1A 25A 300uA@40V 40V 550mV@1A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
IRLML0100
SOT-23SOT-23 MOSFETs ROHShongjiachengMOSFETsLBSS84LT1G
SOT-23-55℃~+150℃ 1 P-Channel 10pF 10Ω@5V 130mA 225mW 2V 30pF 50V 5pF 6nC P-Channel SOT-23 MOSFETs ROHSLeshan Radio (LRC)MOSFETs
LL4148
LL-341 Independent 1V@10mA 200mA 4A 4ns 500mW 5uA@75V 75V LL-34 Switching Diodes ROHSMDDSwitching DiodesMMBT2222A
SOT-23-55℃~+150℃ 1 NPN 100 100nA 1V 300MHz 300mW 40V 600mA 6V NPN Standalone SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)
README
README.mdSmart Plant
See how your plant is doing — on its own e-paper label and in Home Assistant.
Smart Plant measures soil moisture, light, temperature and humidity. Place it in your plant pot, read the measurements on the 2.9-inch e-paper display, and connect it to Home Assistant with ESPHome.
Get started · Create your plant label · Get a board · Read the documentation
A useful label for every plant
- Check the soil and surroundings. Read soil moisture, ambient light, air temperature and relative humidity.
- Read it at the pot. The e-paper screen shows the last displayed readings while the device sleeps.
- Make it yours. Give each plant its own name, illustration and gauge background with the companion Label-maker project.
- Connect to Home Assistant. Choose the native ESPHome API or retained MQTT readings for devices that spend most of their time asleep.
- Run on battery. The firmware sleeps between measurement cycles. The hardware also supports an optional solar cell.
Start with one plant
- Get a board, or use the hardware design files to explore the board.
- Follow the getting-started guide and ESPHome programming guide.
- Set your Wi-Fi credentials and calibrate the soil sensor for your setup.
- Add your own label background, then install the firmware.
The standalone configuration is the starting point for a single device. Read the safety instructions before assembly and flashing.
Create your plant label
The companion Label-maker generates printable plant labels and e-paper backgrounds from JSON or YAML templates. Use it to add a plant name and illustration to your display.
Follow the step-by-step label guide. Start with the plant examples and generator, then follow the programming guide to use the resulting background image. The firmware draws the live readings over that image.
Connect one plant or several
| Setup | Starting point | During deep sleep |
|---|---|---|
| One device with the native ESPHome API | Standalone configuration | No network response; entity availability depends on Home Assistant setup. |
| Several devices with retained MQTT readings | MQTT example | Last published readings remain available. |
| Shared packages with the native ESPHome API | API example | No network response; entity availability depends on Home Assistant setup. |
The multi-device guide explains the shared hardware core and transport profiles. Each device sets its identity and credentials. Calibration and label images use shared defaults unless overridden.
Explore the hardware
Smart Plant combines an ESP32-S2, a soil-moisture probe, environmental sensors and an e-paper display. The repository includes board design files and printable enclosure models.
- Board design
- Enclosure models
- Schematics and supporting files
- Technical specifications
- Assembly guide
Questions and contributions
Use Discussions for questions and ideas. Report reproducible problems in Issues.
Contributions to firmware, documentation and examples are welcome. Describe the problem, the change and how you verified it in your pull request.
Created by J. G. Aguado, with contributions from the community.
License
This project uses CC BY-NC-SA 4.0. See the license for attribution, non-commercial use and sharing requirements.
Parts
75| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 1uF | C0603 | C7, C9, C13, C14, C17, C18, C19, C25, C27, C28 |
| 6 | 10uF | C0603 | C1, C4, C8, C10, C16, C20 |
| 5 | 10k | R0603 | R1, R7, R10, R15, R16 |
| 5 | SS14 | SMA-DIODE | D1, D2, D3, D5, D6 |
| 4 | 1M | R0603 | R8, R14, R18, R20 |
| 3 | 0.1uF | C0603 | C12, C15, C40 |
| 2 | 100nF | C0603 | C6, C11 |
| 2 | 1k | R0603 | R6, R11 |
| 2 | 4.7uF | C0603 | C2, C26 |
| 2 | 5.1k | R0603 | R36, R37 |
| 2 | LOGO | LOGO | G***, G*** |
| 2 | TPB1,27 | B1,27 | TP1, TP2 |
| 1 | 1X04 | J5 | |
| 1 | JST-2-SMD | J1 | |
| 1 | 0.47 | R0603 | R13 |
| 1 | 0.47nF | C0603 | C3 |
| 1 | 1.2k | R0603 | R4 |
| 1 | 1.5k | R0603 | R3 |
| 1 | 10K | R0603 | R9 |
| 1 | 10nF | C0603 | C5 |
| 1 | 10uH | INDUCTOR_4X4MM_NR401 | L3 |
| 1 | 1K | R0603 | R5 |
| 1 | 220 | R0603 | R17 |
| 1 | 240k | R0603 | R21 |
| 1 | 330R | R0603 | R2 |
| 1 | AHT20 | AHT20 | IC3 |
| 1 | E-PAPER-FPC | FPC_24_0.5MM | FPC0 |
| 1 | ESP32-S2-MINI-1-N4R2 | ESP32S2MINI1N4R2 | IC5 |
| 1 | Flash | TACTILE_SWITCH_SMD_5.2MM | S1 |
| 1 | Green | LED_0603 | LED2 |
| 1 | IRLML0100 | SOT23-3 | Q1 |
| 1 | LBSS84LT1G | SOT23 | T2 |
| 1 | LL4148 | LL-34 | D4 |
| 1 | MAX17048G+T10 | SON50P200X200X80-9N | IC7 |
| 1 | MMBT2222A | SOT23 | T1 |
| 1 | RT9080-33GJ5 | SOT94P280X100-5N | IC4 |
| 1 | Red | LED_0603 | LED1 |
| 1 | Reset | TACTILE_SWITCH_SMD_5.2MM | S2 |
| 1 | TLC555CDR | SO08 | IC2 |
| 1 | TP4056 | SOT23-8 | IC1 |
| 1 | USB-C | USB-C-16P-4LAYER-ISOLATED | J6 |
| 1 | VEML7700-TR | VEML7700-TR | IC6 |
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Questions
How big is the Smart Plant PCB?
It measures 80 × 129.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Smart Plant use?
75 parts, built around the ESP32-S2-MINI-1-N4R2, AHT20, VEML7700-TR and MAX17048G+T10. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Smart Plant KiCad files?
From the JGAguado/Smart_Plant repository on GitHub, at the commit this page was made from: the board is Design/Smart_Plant.kicad_pcb and its schematic Design/Smart_Plant.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Smart Plant design in my own project?
Its repository states no licence, so its author keeps all rights: ask JGAguado before reusing the design.