Adafruit Bluefruit LE SPI Friend - Bluetooth Low Energy (BLE) SF_RFID Tags February 2022 update: We have

February 2022 update: We have released newer S13VxF5 step-up/step-down regulators regulators that could be better alternatives to this product

while the negative potential means that solution shows a certain degree of reduction

Connect to it with any microcontroller over SPI and read out the resistance ratio from the internal ADC

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Adafruit Bluefruit LE SPI Friend - Bluetooth Low Energy (BLE) SF_RFID Tags February 2022 update: We haveWould you like to add powerful and easy to use Bluetooth Low Energy to your robot, art or other electronics project? Heck yeah! With BLE now included in modern smart phones and tablets, its fun to add wireless connectivity. So what you really need is the new Adafruit Bluefruit LE SPI Friend! The Bluefruit LE SPI Friend makes it easy to add Bluetooth Low Energy connectivity to anything with 4 or 5 GPIO pins. With SPI, you don't have to worry about baud