Welcome back @geerlingguy!
1. Can I get the data off the AirGradient Go via USB-C or a direct Bluetooth or WiFi connection to a computer? Or must I use the AirGradient smartphone app?
Currently, the most convenient way to get the data is using the AirGradient Map (smartphone app).
The local API (like in the AirGradient ONE & Open Air) is currently not available yet, but we are working on it as well as the Home Assistant support.
USB-wise, it is also possible to get the data via serial log (USB), but this is more of a device diagnostic channel than a stable air quality data logger.
Here’s an example of what is shown when you get the serial log of the AirGradient Go:
[09:14:27]temperature: 34.36
[09:14:27]humidity: 50.80
[09:14:27]pm_01: 1.0
[09:14:27]pm_25: 1.0
[09:14:27]pm_10: 1.0
[09:14:27]pm_05_pc: 684
[09:14:27]pm_01_pc: 768
[09:14:27]pm_25_pc: 770
[09:14:27]pm_10_pc: 770
[09:14:27]co2: 1660
[09:14:27]tvoc_index: -1
[09:14:27]tvoc_raw: 31869
[09:14:27]nox_index: -1
[09:14:27]nox_raw: 16779
[09:14:27]battery_voltage: 4.21
[09:14:27]charging_voltage: 4.86
[09:14:27]pressure: 1007.8
[09:14:27]altitude: 45.7
2. Can the Stationary mode work with Home Assistant, like I have set up with my AirGradient Ones, where it is an HA accessory, and not streaming to AirGradient’s cloud?
Our engineers are currently working on it with the Home Assistant team to enable support. Please stay tuned for a fully local experience! (I have also been looking forward to this feature too)