Onion ADC Expansion
The Omega ADC Expansion will bring a new world – the analog world – directly to your Omega2 projects. Based on the ADS1115 analog-to-digital converter chip, this Expansion provides 4 analog input channels, each with 16 bits of precision at a maximum of 860 samples per second, and communicates with your Omega using I2C.
With this Expansion, your Omega will be able to read and interpret analog signals! This opens the door to a whole bunch of sensors. Directly connect up to 4 analog signals to the female header on the board and safely sample analog voltages from -6V to +6V. There’s also power and ground headers for each analog input, providing an easy way to power your sensors.
We’re huge fans of the Grove family of sensors, actuators and controllers, so we’ve included 3 Grove connectors right on the ADC Expansion. Two connectors are analog, and the third is digital I2C.
A nice bonus about the ADC Expansion is that it’s stackable, each Omega2 can support up to 2 stacked ADC Expansions, giving you 8 analog input channels in total. The switch on the side of lets you change the I2C address (between 0x48 and 0x49).
Setup is a breeze, just plug it into the Expansion Header on a Dock and you’re all set. Take a look at our guides to get started connecting sensors and Grove devices, and reading analog signals from the Omega’s Linux command line.
- Analog input channels: 4
- Signal resolution: 16 bits
- Samples per Second: programmable from 8 to 860
- Input analog voltage range: -6V to +6V
- Stackable: Yes, up to 2 ADC Expansions, providing 8 analog input channels
- Chipset: TI ADS1115
- Communication Protocol to Omega: I2C
Compatible analog sensors
- Temperature: TMP36 / LM335
- Humidity: IH-4030
- Light: Photodetector / ALS-PT19 / BPW34
- Water Level / PN-12110215TC-8
- Current: ACS723
- Hall-Effect: AH1815
- Any voltage output sensor from -6V to +6V