succbone: Update README

succbone/README.md

@@ -13,3 +13,24 @@ succbone is our "automation" system for the vacuum system of the SEM.
   - Signal two different vacuum levels to the original evacuation controller
     * Rough vacuum reached
     * High vacuum reached
+- Diffusion pump temperature monitoring via three PT100 sensors
+- Environmental temperature & humidity monitoring (external sensor)
+
+### Device Overview
+These are the main devices powering the succbone control system.  For details,
+please check the wiring diagrams in [`panel.pdf`](./panel.pdf).
+
+- `-KEB1`: BeagleBone as main control system with addonboard for PSU & analog 0-10V readout
+- `-KED1`: MikroTik RB450G router as gateway to the outside and network switch
+- `-KED2`: MODBUS-TCP to MODBUS-RTU bridge
+- `-KEC1`: MODBUS-RTU 8x relay output and 8x digital input board
+- `-KEC2`: MODBUS-RTU 8x PT100 500°C transmitter
+- `-BTA1`: MODBUS-RTU environmental temperature & humidity sensor
+- `-QAA1`: Contactor for the roughing pump interlock
+- `-QAA2`: Contactor for the diffusion pump interlock
+
+### 3D-Printed Components
+- [DIN-rail mount for the BeagleBone](https://www.printables.com/model/1058768-beaglebone-din-mount)
+- [DIN-rail mount for the MikroTik RB450G]
+- (legacy: [DIN-rail mount for relay board](https://www.printables.com/model/1019947-relay-board-din-rail-mount))
+- [Cable Strain Relief Plates](https://www.printables.com/model/932070-parametric-cable-strain-relief-plate)