The lack of an Analog to Digital Converter is a pain on the Raspberry Pi. You want to read those real world signals all the time and we didn't have a good way of doing it. And not one really workable ADC for the Grove existed until now. SwitchDoc Labs designed the Grove4Ch16BitADC board board to fulfill the need. It brings 4 channels of 16 bit Analog to the Raspberry Pi, Arduino and the ESP8266. Based on the industry standard ADS1115 IC. The Grove 4 Ch 16bit ADC connects to a Grove I2C connector and supplies 4 channels of Grove Analog plugs for your projects.