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Robin2

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Everything posted by Robin2

  1. If the motors in the locomotives are modern and only draw a low current then a voltage step-up module (such as an MT3608) and a 1S LiPo might be the best option as it makes charging easier. Just step up the voltage by the smallest amount that is necessary to get the performance you require. ...R
  2. If it can be programmed with the AVRisp then it should be programmable with an Uno acting as the ISP. I program the Attiny84, 45 and 1634 with the Uno as ISP. The Arduino IDE includes a program called ArduinoISP. ...R
  3. Perhaps there is no need for a heat sink? ...R
  4. An Arduino Uno can control up to 12 servos at the same time and a Mega can control even more without needing any shield or motor driver. ...R
  5. The Pololu website has a wide range of DC motor drivers as well as stepper drivers. Equivalent products are also available elsewhere. ...R
  6. Isn't that a 5 minute job with a jigsaw? ...R
  7. AFAIK every big company has marketing guys. ...R
  8. Alas, the marketing guys got their hands on the typewriter ...R
  9. An L298N is a very poor choice for a stepper motor driver. You should get a specialised stepper motor driver such as a Pololu DRV8825. A specialised driver has the ability to limit the current to protect the motor and it also takes a lot of the computational load off the Arduino. HOWEVER you need to choose a driver that can comfortably supply the current required by your motor and I don't know what that is - it will be stated in the motor specifications. The DRV8825 is OK for motors that need 1.7 amps or less. ...R Stepper Motor Basics Simple Stepper Code also look up the AccelStepper library
  10. I have found that some matt paint on the rail greatly improves adhesion on inclines I have built my own BPRC equipment using the Arduino programming system for 009 models using the Kato tram chassis - that makes it very flexible but only for people who are prepared to do their own construction and programming. I have no interest in on-board sound but I might eventually experiment with speakers under the baseboards. ...R
  11. What about something simple like handing the RC controller to the other person? ...R
  12. Generally the sensor will need to be connected to a micro-controller and a wireless device to send messages and the main Arduino will need a compatible wireless receiver. Probably the simplest MCU/wireless combination is the ESP8266 which can transmit as WiFi or using its own ESP-NOW system. The receiving Arduino will also need to be connected to an ESP8266. ESP-NOW demo If you want to use a regular Arduino (such as nano) with the sensor then you could use nRF24L01+ modules for the wireless communication. Simple nRF24L01+ Tutorial ...R
  13. 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
  14. I don't have the patience to wait for stuff from China. And those devices are several times larger than an LDR ...R
  15. 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
  16. 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
  17. 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
  18. 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
  19. This happened to me a few days ago and someone kindly pointed there is an option to HIDE a post. ...R
  20. Out of curiosity, what was the voltage stepped up to? ...R
  21. 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
  22. 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
  23. 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
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