Eval¶

Usecases:

• sensor for 4 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.
• i2c RTC for date (standalone).
• CAN for candis.
  1xPWM output (trivial canio, workaround fuer lampen. Warum 2?)
  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
• Update via USB is a nice feature. Circuit already available.
• RTC for switching lamps, standalone
• 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
• Switch connection VUSB to can

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 (5V, high current, with mosfets)

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)