The SparkFun LiPo Fuel Gauge - MAX17043 connects your LiPo battery to your project and uses a sophisticated algorithm to detect the relative state of charge and direct A/D measurement of battery voltage.

The SparkFun Photodetector - MAX30101 (Qwiic) is the successor to the MAX30105 particle sensor, a highly sensitive optical sensor. This tutorial will get you up and running to retrieve the raw data from the MAX30101 sensor.

The SparkFun Qwiic ADC provides four channels of I2C controlled ADC input that can be used as single-ended inputs, or in pairs for differential inputs.

With the included joystick, accelerometer, proximity sensor, and display board, hooking up a handful of inputs and outputs to an Arduino has never been so easy

If you need an intermediate GPS project to tickle your fancy, we've got one ready to go.