The Hardware :: Waddon
From Grahamsoft Labs
Contents |
[edit] Control System
Each block controller will require a 28 Pin PIC18F2550 Microcontroller which has 24 input/output lines. The datasheet can be found here.
Microcontroller Specification
- IC, 8-BIT FLASH MCU
- Timers, No. of:4
- Bits, No. of:8
- Frequency, clock:48MHz
- Memory size, RAM:2048Byte
- Memory size:32k
- Temp, op. min:-40°C
- EEPROM size:256Byte
- Temp, op. max:85°C
- I/O lines, No. of:24
- Memory type:FLASH
- Pins, No. of:28
- Case style:SDIL
- ADC inputs, No. of:10
- Base number:18
- Bits, number in ADC:10
- Bits, number in timer:16
- IC Generic number:18F2550
- Interrupts, internal No. of:19
- Logic function number:18F2550
- Microprocessor/controller features:SPI, I²C, 2 xCCP, EUSART, 2 x Comparators, 1 x 8-bit timer, 3 x 16-bit timer
- Temperature range, IC:Industrial
- Frequency, operating:48Hz
The I/O requirement for each block is detailed below:
Item Req. I/O Pins Qty Sub Total ------------- --------------- ----- ----------- Train Control 2 1 2 Sensors 1 4(5) 4(5) Signals 2 1 2 Point Motors 2 2(3) 4(6) ------------- --------------- ----- ----------- Total 12(15)
Notes
- The number of I/O lines required for Comms is unknown at this time.
- One block has an additional siding so requires an additional point and sensor; these requirements are shown in brackets.
[edit] Point Control
A Hornby point motor requires 2 lines of input which each controls one direction of travel. Operating between 12 to 16 volts each line requires a short pulse of power to operate and failure to do so will lead to burn out of the motor.
.
[edit] Signals
LED based signals that require a separate output line for each colour. Signals can range from 2 to 4 colours
[edit] Train Position
Reflective switches detect objects up to one inch in front of them. They each require one input line and also require a separate power supply.
http://www.farnell.com/datasheets/84799.pdf
[edit] Train Control
H Bridge with an appropriate heat sink.
