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Product Description
This soil moisture sensor differs from most of the resistive sensors on the market, using capacitive sensing principle to detect soil moisture. It avoids the problem that the resistance sensor is easy to corrode and greatly prolongs its working life. With its built-in ESP32, it will help you turn your plants into part of monitoring platforms for IoT
Capacitive soil moisture sensor works by measuring the change in capacitance that’s associated with dielectric permittivity (the ability of a substance to hold an electrical charge). It’s commonly built with a positive and negative plate, with a dielectric medium separating it in the middle.
Instead of directly inserting two exposed probes for moisture measurement, it measures moisture through the ions dissolved. As such, capacitive measuring is corrosion-free and allows for better reading of moisture content.
Include: on-board WIFI, Bluetooth, DHT11 Environment Humidity & Temperature sensor and battery connector
What is used for:
- Household plants
- Precision irrigation in agriculture
- Research & Forecast
|
Hardware Specifications |
|
| Chipset | ESPRESSIF-ESP32 (Wi-Fi & Bluetooth)240MHz Xtensa® single-/dual-core 32-bit LX6 microprocessor |
| FLASH | QSPI flash 4MB |
| SRAM | 520 kB SRAM |
| Button | IO0 |
| Wake up | IO35 |
| Reset | |
| USB to TTL | CP2104 |
| Modular interface | UART、SPI、SDIO、I2C、LED PWM、TV PWM、I2S、IRGPIO、capacitor touch sensor、ADC、DACLNA pre-amplifier |
| On-board clock | 40MHz crystal oscillator |
| Temperature and humidity sensor | DHT11 |
| Reserved extension interface | 21~22 |
| Working current | About 150 mA |
| Sleep current | About 220 uA |
| Working temperature range | -40℃ ~ +85℃ |
| Size&Weight | 155.04*35*8.19mm(13.65g) |
| Power Supply Specifications | |
| Power Supply Input | USB 5V/1A |
| Charging current | 500mA |
| Battery Input | 3.7-4.2V |
| Battery | 3.7V lithium battery |
| Charge IC | TP4054 |
| JST Connector | 2Pin 1.25mm |
| USB | Type-C |
|
Wi-Fi |
|
| Standard | FCC/CE-RED/IC/TELEC/KCC/SRRC/NCC (ESP32 chip) |
| Protocol | 802.11 b/g/n(802.11n，speed up to150Mbps)A-MPDU and A-MSDU polymerization，support 0.4μS Protection interval |
| Frequency range | 2.4GHz~2.5GHz(2400M~2483.5M) |
| Transmit Power | 22dBm |
| Communication distance | 300m |
|
Bluetooth |
|
| Protocol | Meet bluetooth v4.2BR/EDR and BLE standard |
| Radio frequency | With -97dBm sensitivity NZIF receiver Class-1,Class-2&Class-3 emitter AFH |
| Audio frequency | CVSD&SBC audio frequency |
|
Software specification |
|
| Wi-Fi Mode | Station/SoftAP/SoftAP+Station/P2P |
| Security mechanism | WPA/WPA2/WPA2-Enterprise/WPS |
| Encryption Type | AES/RSA/ECC/SHA |
| Firmware upgrade | UART download/OTA（Through network/host to download and write firmware） |
| Software Development | Support cloud server development /SDK for user firmware development |
| Networking protocol | IPv4、IPv6、SSL、TCP/UDP/HTTP/FTP/MQTT |
| User Configuration | AT + Instruction set, cloud server, android/iOSapp |
| OS | FreeRTOS |
Sample Code: Github
Product Pin
Product dimensions:
Product Detail
