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Robin2

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  1. I already have the components I want - LDRs. I don't have the patience to construct an equivalent from parts. I had the impression from your earlier Post that you had found a supplier of a ready-made IR detector that is smaller than an LDR. Apologies if I misunderstood. ...R
  2. I don't have the patience to wait for stuff from China. And those devices are several times larger than an LDR ...R
  3. If you do decide to use your Arduino to control the Megapoints board you need to use I2C to communicate with it. The Megapoints website has some example Arduino code. However I agree with others that you can control servos directly with an Arduino. I use Light Dependent Resistors set between the sleepers to detect trains. Megapoints seem to have good value in IR detectors - but they are more expensive and bigger than LDRs. ...R
  4. I stand corrected and I can see that a big lump of bird sh*t or twig could cause a derailment. But the cleaning would surely not need to be as meticulous with battery power as with track power? ...R
  5. A garden railway seems the ideal candidate for battery power as it removes the need for track cleaning. Indeed dirty track will aid adhesion. ...R
  6. This is an interesting example of the electrical complexity of introducing an Arduino to a traditional track control system. If the Arduino had been in at the planning stage the turnouts would be operated with servos and the signal LEDs would use 5v directly from the Arduino. ...R
  7. This happened to me a few days ago and someone kindly pointed there is an option to HIDE a post. ...R
  8. Out of curiosity, what was the voltage stepped up to? ...R
  9. Usually with multiple LiPos the connections to each cell are brought out at the charging point - so a 2S LiPo will have three wires at the charging socket. In effect this allows each cell to be charged separately - which is what balance charging is. Compared to model airplanes or racing boats or cars model trains are very gentle on batteries and balance-charging may not be necessary every time. However if you have a proper charger for a 2S LiPo it is probably simplest to use it all the time. I have 1S LiPos and a voltage booster (boosting to 5.5v) for Kato n-gauge tram chassis in 009 locos. I remove the batteries for charging and I made a simple charger using an MCP73831 charge control chip. Because I have very small cells (240mAh) I was afraid that off-the-shelf chargers would provide a too-high charge current. ...R
  10. I have not used DCC at all but it would certainly be possible to create a DCC signal with an Arduino-type microprocessor They are very robust and have a lot of error correction built in. AFAIK the same wireless devices are used within some of the off-the-shelf RC equipment. ...R
  11. I'm not sure I understand that. Do you mean that you want 4 handsets and each one can select any one of maybe 12 locos? I made something like that using an Arduino-based system with nRF24L01+ wireless transceivers - they don't "bind" in the way that the Deltang system does so each wireless transmission could be to a different loco and there could be 10 or 20 transmissions per second. With my system the control was from a web browser on my PC or phone (or both) and an user could select any loco that was not already in use by another user. Have a look at this Simple nRF24L01+ Tutorial if you are interested. ...R
  12. I would say it is next to impossible because you cannot guarantee the latency of any wireless system - lost packets are common. Much better to send data - for example a number representing the speed - and have the receiver generate the DCC signal based on that data. Also keep in mind that "normal" DCC modules expect the "signal" to carry power as well as information. Another consideration is that the DCC information in the tracks will be for several locomotives. It would make more sense only to send by wireless the data for the locomotive with the receiver. ...R
  13. For small size I sawed the PCB antenna from an nRF24L01+ and soldered on a short piece of flexible wire about 35mm long. (I think I used the same length as Deltangs use). It has worked fine for the short ranges that I use. I have not tested its ultimate range. This may give you some flexibility - however @Giles' experience is reassuring. Some years ago I had a Deltang receiver in a metal bodied Graham Farish large prairie. I think I ensured that the antenna wire poked out through the window. ...R
  14. And with battery power if you need more adhesion you can put some matt paint on the track - works very well. ...R
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