Ok I have finally had a little bit of time to work on things (will be short lived as I’ve just bought a house and moving in the next couple of weeks Aghh!!).
Things are getting very close to reality after many design changes, the very nearly final Strobit Trigger base board, aka a modified Ardiuno BT board, with the Bluetooth removed and now fitted with the RFM12B SMD Tranceiver module and an external SMA antenna connector. The Eagle 3D side of things still needs work as some components are not shown and the inductor for the DC-DC converter is incorrect, but you get the basic idea right!
Why have I gone to a non-dedicated trigger board?
Well a couple of reasons, initially to cover myself from any patent issues that might have arrisen had I used a dedicated wireless triggering device, but mainly to allow better expandability. Why have a dedicated trigger with all the fruit and only use half of it, this way dedicated boards can be used, i.e. standard trigger, or sound/light trigger, sequences etc. Another reason is that the Ardruino is very well established and supported in the open source community, especially when it comes to the firmware libraries etc, it’s already been done. also I can use these in my robotics hobby as well, not just for photography.
Ok onto the board features:
- Fairly compact same size as ArduinoBT
- Standard Arduino Pin headers, so should be able to use with existing shields.
- Will operate from as low as 1.2V, so should work from x1 NIMH AA easily enough.
- RFM12 Tranceiver, up to 300m range (as per datasheets, although it does depend on the datarate)
- SMA connector so you can connect an external antenna for better reliability and range, or remove the SMA connector and use a piece of wire as the antenna.
What is left to do?
- Well the design is pretty well done, I want to get some prototypes made so I will be sending it off very shortly for fabrication.
- Different variations of shields need to be done, first one being stock standard strobe type of triggr, input and outputs, then others as needed
- Follow me on Twitter / Strobit Update
- Strobit Wireless Widget Photos
- RFM12 Tutorial – Part2
- Strobist Trigger