Features 1、Equipped with ESP32 chip, TYPE-C interface, adopting charging IC of TP4054. 2、Adopt DHT12 temperature and humidity sensor, stable performance, reliable to use. 3、Added button wake-up function (IO35) and soil salinity test function (CD4060BM+TL034IDR). 4、Added illumination (BH1750FV1) strength test. Reserved external device expansion (single bus serial port IIC----21~22). 5、Longer battery life. In the case of testing moisture, the salt and photosynthetic absorption of the soil can be tested. Specification Item Type Module Condition 100% brand new Material PCB Hardware Chipset For ESPRESSIF-ESP32 (Wi-Fi & Bluetooth)240MHz Xtensa single/dual-core 32-bit LX6 microprocessor FLASH QSPI flash 4MB SRAM 520kB SRAM Button IO0 Wake up 1O35 USB to TTL CP2104 Modular Interface UART, SPI, SDIO, I2C, LED PWM, TV PWM, 12S, IRGPIO, capacitor touch sensor, ADC, DACLNA pre-amplifier On-board Clock 40MHz crystal oscillator Temperature and Humidity Sensor DHT12 Reserved Extension Interface 21~22 Working Current About 150mA Sleep Current About 220uA Working Temperature Range -40℃~+85℃ Size&Weight Approx. 155.04x35x8.19mm/6.1x1.38x0.32in, 13.65g Power Supply 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 0.4uS Protection interval Frequency Range 2.4GHz~2.5GHz(2400M~2483.5M) Transmit Power 22dBm Communication Distance 300m/0.3km 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 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, For Android/iOS app OS For FreeRTOS Package List 1 x Module 2 x Pin Feet 1 x Power Line