Review on Lora32U4Ii Development JST PH2 0MM 2P Connector ATmega32U4 by Vijin Wisniewski

This is a great Arduino RF sensor station. Using the RadioHead "RH_RF95.h" library. I have several, send data, fall asleep, resend data, sleep. If you are receiving an HF on a different type of card you will need to ensure your data structure is the same size in bytes as not all MCUs are the same. I've found using "short" to be the most compatible. I used the "Adafruit Feather 32u4" board in the adruino IDE. The pinout corresponds to pin 32u42. The sleep current is 0.13mA using the "LowPower.h" library which also has a sleep interrupt to wake up.3. The activation pin comes in handy when you don't want to use the voltage sensor to turn off the ESC when the battery is low.4. It has a solder bridge to increase the charging current to 500mA. I have a 5V solar panel connected to a 5V pin with a large capacitance of 4700uF. Uses a standard 2mm JST LiPo battery connector and perfectly charges the battery. The battery connector is at the top for easy access.6. You can hibernate it at any time by calling a for loop. int i; for (i = 0; i < sleepCycles; i++) {LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);}7. Has a built in battery voltage divider to read the battery voltage across terminal A9.8. The adjustable antenna is good9. Suitable for a breadboard with an extra row of pins on each side. If you only need it as a HF station to send data, no OLED or WiFi, this board is much better than the Heltec WiFi Lora esp32 kit board which I am replacing with this LoRa32u4 board. The only problem with all 32u4 microcontrollers is the serial monitor and uploading the sketch is a bit of a hassle until you figure it out. You need to press the reset button after the download has started. I wish it had an SMA connector for the antenna.