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ESP32 Soil Humidity and Temperature Sensor Module

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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
Button IO0
Wake up  IO35
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


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


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


Sample Code: Github


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