Portable Raspberry Pi Pico Soil Moisture Sensor
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I wanted to create a compact rechargeable soil moisture sensor that feels more like a real portable device than a typical prototype.
This device is a rechargeable portable soil moisture monitoring system based on the Raspberry Pi Pico.
It combines:
- Raspberry Pi Pico
- SSD1306 OLED Display
- Capacitive Soil Moisture Sensor v2.0
- TP4056 Charging Module
- NCR18650B Lithium-Ion Battery
- Physical Jumper Power Disconnect
- NCR18650B Battery
The device uses a physical jumper-based hard power disconnect system.
Jumper Installed:
- TP4056 OUT+ connected to Pico VSYS
- Device powered ON
Jumper Removed:
- VSYS disconnected
- Device powered OFF
Advantages:
- Ultra low standby power
- No parasitic drain
- Reliable physical disconnect
- Simple and robust operation
The TP4056 charging board handles:
- Lithium-ion charging
- Overcharge protection
- USB charging via Micro-USB
- System Power Path
Battery → TP4056 → Jumper → Pico VSYS
Bill of Materials (BOM):
Main Electronics:
Component Quantity Description
Raspberry Pi Pico 1 Main microcontroller
SSD1306 OLED 0.96" Display 1 I2C 128x64 white display
Capacitive Soil Moisture Sensor v2.0 …
