signaltower

ATmega8 is the interface between the control of the signals/railway switches and the communication to rpi-central in a model railroad project

Components

Signal API
Railway switch API
RF12 chip API
- communication via SPI
- connected Pins:
  
  ATmega 8 PCB | | RF12 ------------: |:-----:| :--- 3.3V | ----> | VDD PD2 | <---- | NIRQ MOSI | ----> | SDI GND | ----> | GND MISO | <---- | SDO CLK | ----> | SCK SS | ----> | nSEL

Model Railroad description

Goal: a self-made model railroad which can be controlled via a PC

Train components and casings are 3D printed
PCB self-made
Central Raspberry Pi connected to WIFI
Communication from RPi-central to the signal-towers via RF12 chip TRX433S
MySQL database hosted on Raspberry Pi
Signal towers are controlled by an ATmega8 which is connected with a RF12 chip (see signaltower project)
Another Raspberry Pi with a camera module is in every train which is connected via a 3G dongle to the internet (see RPi-train project)