Environment sensor sends ressure, humidity and temperature to N2K bus.
e-Paper Barograph displays log of pressure, humidity and temperature, displays 48h of readings.
On bus power send readings once per second, update display evey 5 mins. On battery power take readings based on X scale and fill buffer, update display every 15 mins. When battery is below 3.2v log pressure but don't update display
- Light sleep ~16ma
- Read sensor ~20ma
- Display update ~50ma`
- ESP32 (NANO32)
- BME280 I2C
- SN65HVD230D CAN tranceiver
- WaveShare 2.13 e-Paper display
- 120K, 22K resistors for vbatt monitoring
- Monitor CAN power/ charging voltage for battery switching
- Finish sleep modes for power saving on battery
- move circular array to RTC SRAM for deep sleep
- allow multiple X scales 12h,24h,48h
- touch sensor buttons for X scale Y scale