Product main upgrade function attributes:
1: Change the original ESP32 module to a single ESP32 chip.2: The charging IC is changed from the original TP5400 to TP4054.3: The original MICR seat is changed to TYPE-C.4: The original normal power supply mode is changed to the button sleep wake-up mode (or the customer does the timing wake-up by himself).5: The size of the board is 45MM smaller than the previous length, and the width is increased by 2.54MM
Added part:
1: Added sleep button wake-up function (IO35)2: Added the function of testing soil salinity (CD4060BM+TL034IDR)3: Increase the intensity test of light (BH1750FVI)4: Reserved external device expansion (single bus serial port IIC—-21~22)
Advantage:
The battery life is much longer than before. In the case of testing moisture, you can test the soil salt and photosynthetic absorption, reasonable fertilization and proper sunshine.

Hardware Specifications Chipset ESPRESSIF-ESP32 (Wi-Fi & Bluetooth)240MHz Xtensa single- /dual-core 32-bit LX6 microprocessor FLASH QSPI flash4MB SRAM 520 kBSRAM Button IO0 Wake up IO35 USB to TTL CP2104 (update toCH9102F) 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 DHT12 Reserved extension interface 21~22 Working current About 150 mA Sleep current About 220uA Working temperature range -4OC~+85C 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 (Note: battery is not includes) Charge IC TP4054 JST Connector 2Pin 1.25mm USB Type-C Wi-Fi Description Standard FCC/CE-RED/IC/TELEC/KCC/SRRC/NCC (ESP32 chip) Protocol 802.11 b/g/n (802.11n, speed up to 150Mbps) A-MPDU and AMSDU polymerization, support 0.4uS Protection interval Frequency range 2.4GHz~2.5GHz(2400M~2483.5M) Transmit Power 22dBm Communication distance 300M Bluetooth Description Protocol Meet bluetooth V4.2BR/EDR and BLE standard Radio frequency With -97dBm sensitivity NZIF receiverClass-1,Class-2&Class-3emitter AFH Audio frequency CVSD&SBC audio frequency Software specification Description 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 Pv4, IPv6, SSL, TCP/UDP/HTTP/FTP/MQTT User Configuration AT+Instruction set, cloudserver,android/iOSapp OS FreeRTOS

Package includes:
1 xT-Higrow ESP32 WiFi Bluetooth Module