Eval¶

Usecases:

• sensor for 4 sensors

Keep it simple because i dont even know if it will work (dg409 has 100Ohms; can be checked with existing sensors).
use dg409 to switch between sensors. (DG409 is 2:4 with 2 address lines, DG408 would be 1:8 with 3 address lines)
Dann kann ground gleich mit geschaltet werden und mehrere sensoren sllten sich nicht beeinflussen.

• 2x 5v output for pumps. Generating 6V somewhere else makes more sense
• i2c RTC for date (standalone), recording temprec
• CAN for candis.
• 1xPWM output (trivial canio, workaround fuer lampen. Warum 2?) anderes projekt
• 1xPWM output buzzer; 17:[[https://www.homofaciens.de/technics-base-circuits-h-bridge_ge.htm]] muesst sein, mit not baustein.
  Wenn invertiertes PWM-Signal vorhanden ist, spart man sich nen enable. NOT + NAND anderes Projekt
• Update via USB is a nice feature. Circuit already available. Andere MCU
• RTC for recording temprec
• PWM output for lamps
• loud buzzer for alarm/alarm-clock
• button for confirm stuff
• OUT output for lamps; 2x3V (plant lamp/room lamp)
• 2LEDs regular
• SPI NAND-Flash temprec
• Switch connection VUSB to can
• internal RTC to provide timestamps
• I2C-eeprom fuer CAN-Id, dann doch I2C-RTC?
• Dann doch SPI-Flash?

Most things can be copied from candis.
( https://www.nxp.com/docs/en/data-sheet/MC34933.pdf )

Connectors¶

• Debug
• USB
• 4x 2Pin Sensors
• CANBus
• 1x 2Pin PWM Out for Lamp
• 2x 2Pin Out switch Plantlamp, room lamp
• 2x 2Pin Out pumps(3V)

HMI¶

• 2 LEDs regular (green/amber)
• 4 LEDs sensors selected(org) (SIPO)
• 4 LEDs sensors status(vio) (SIPO)
• 1 Button, quit alarm
• 2 Button boot/reset (firmware update via USB)