Olaf Funke designed a nice FREDI for Fremo.
It is a professional set-up, in a way that the design is based on the use of many smd components.
These components are undoubtly perfect for the job, but for the home hobbyist very difficult to put together.
At least, that was my opinion.
So, now with the permission of Olaf, I redesigned the unit using only one SMD component.
A small other difference is the fact that I aborted the possibility of installing a normal potentiometer.
So only the modern incremental switch is possible, as used in many central units (like Intellibox and CSI/II) .
Any questions about this FREDI, please contact Peter.
I'll be very happy to help you out.
This hand held throttle is very well supported in Rocrail.
For a small fee Fred Jansen is prepared to program an Atmega8L for you.
|1||R11||10 MΩ||see assembling info|
|1||C1||ELCO 22 uF 25 V radial|
|1||C7||ELCO 10 uF 25V radial|
|2||Led1,Led2||LED 3mm green|
|1||Led3||LED 3mm red|
|1||IC1 socket||Dil-28 small|
|1||J1||Socket RJ12 6PC||SMD type|
|1||S2||Encoder EC11 with push switch||Darisus EC11E15244|
|6||S3,S4,S5,S6,S7,S8||Tact switch PC horizontal||Reichelt 3301b|
|1||Box||Housing||Reichelt SP 2090 SW|
|4||self tapping screws||2,9 x 6||Reichelt SBL 2965|
For the fimware, I have to refer to the original FREDI site.
A few remarks have to be made to help you being succesfull with the production of this FredI.
Fix the empty PCB with screws in it's future housing, and use it to drill the exact positions of the pushbuttons, SW2 and leds.
Use the pcb as a mould for holes of pushbuttons, leds and SW2.
Pushbutton positions have a little center hole for this purpose.
All other parts can be mounted after that.
The pushbuttons and leds are mounted at the backside of the PCB.
Please take care not to use the center hole of the leds, because that one is only a drilling mould.
After a serious check, connect the pcb , without IC1, to LocoNet. Check if 3,3 volt is correct between pt 7 and 8 in IC1 socket.
As far as my experience has gone, R11 can be omitted.
Should you have any misfunctioning, the resistor might help.
Then refer to installation instructions at http://fremodcc.sourceforge.net/diy/fred2/fredi_d.html
If you can not find it there, contact Peter.
After assembling the pcboard, it is better to test the 3,3 Volt power to the processor, before inserting the processor itself.
Just connect GCA124 to LocoNet and switch Railpower ON.(Important!)
Between point 7 & 8 of IC1 should now show 3,3Volt.