Hardware » sensemux

h1. 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 can? Switch?

Most things can be copied from candis.
(

https://www.nxp.com/docs/en/data-sheet/MC34933.pdf )

h1. 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)

h1. 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)