EDIT Since discovering that I2C was an easier and more appropriate method I have altered the title to reflect the new direction End of edit Hi all new here and relatively new to Arduino stuff. I have been using Arduino Nanos to help me with my model railroad to change track switches, semaphores a…

[image] hallowed31: Never throw out those old wall warts from devices you don't use anymore. With a caveat - those wall warts that are unregulated, i.e. deliver excess voltage in low current conditions, and sag to their rated voltage output somewhere near their rated current output, are a dis…

[image] camsysca: Please explain how, in maximum circumstances, the wall wart could adequately supply 1.5* it's maximum current? Or did you perhaps mean maximum divided by 1.5, or multiplied by 2/3? Heh, coffee hasn't kicked in yet (I'm in EST) - yeah you wrap three or four hair elastics arou…

Thanks for the replies I have some original Dell 19.5v laptop chargers rated at 3.2A, I would imagine they would be better quality that the cheap ones

[image] shauntherailroadguy: Dell 19.5v They will more than likely be. But 19.5V exceeds the spec of the Mega ( https://docs.arduino.cc/hardware/mega-2560/#tech-specs ) Note that the the voltage regulator on the Mega will have to dissipate a lot more heat if it has to convert 19.5V to 5V. So …

I thought the Mega was rated to 20v Not a problem, I have other power adaptors from reputable brands that I hoard. I'm pretty sure I have a Logitech 9v one somewhere. Having said that, Amazon have some good ones <a href="https://www.amazon.com/Universal-Regulated-Switching-Industrial-Transformer/dp/B0CCL86TGY/ref=sr_1_6?crid=24KNLG1P8VQ0E&dib=eyJ2IjoiMSJ9.03bYtgvqezzXwuaQJg3JvQ_lyhT50aS_5-CwZEYv9njhFbj72gF0VuBS_WG08gnJI8-6c2CzTDXJqGC0m5OXLPFTr7AbvfterW8okRTksZL8GaGZWkP8Z9XPFuzVfDEx3JkF8jsMwtR4-5aaF0WfpgzAsKDW5Joj7NWSrcWz7OA8IUB5NTC-s3nv9yEYDp7KC9Rq2u9a3Bv_k0FvwZqLeW9bgaGToDw3BDvdOK_hvk0.jT25esTAcVDsGbXL9Ns5pYs-6bz85RFZn6SYrqepV_w&dib_tag=se&keywords=12v%2Bpower%2Bsupply&qid=1734586410&sprefix=12v%2B%2Caps%2C605&sr=8-6&th=1">https://www.amazon.com/Universal-Regulated-Switching-Industrial-Transformer/dp/B0CCL8…

[image] shauntherailroadguy: I thought the Mega was rated to 20v There used to be an absolute min/max spec; if memory serves me well 6V-20V. Those values might work under some conditions but it's never a good idea to push electronics to their limits.

Or, think about using an adjustable 'buck' converter - takes your 19V, outputs whatever you adjust it to, for example 7.5V to feed the Mega. A second buck converter could supply servos or whatever, by setting it's output to 5V. There are many solutions to the problem of feeding a Mega, or an Uno, …

[image] sterretje: but it's never a good idea to push electronics to their limits. Unless... [amp11]

Hi all This is a sketch to just check out some hardware for incorporating into the slaves to make sure that it all works OK before changing over to slave mode #include "AccelStepper.h" #define HALFSTEP 8 #define motorPin1 4 #define motorPin2 5 #define motorPin3 6 #define motorPin4 7 int endPoi…

I used this code instead to resolve it if (buttonState1 == LOW) //digitalWrite(ledPin1, LOW); digitalWrite(ledPin2, HIGH); if (buttonState1 == HIGH) //digitalWrite(ledPin1, HIGH); digitalWrite(ledPin2, LOW); if (buttonState2 == LOW) digitalWrite(ledPin1, HIGH); //digital…

Trying to learn I2C (was RS485) to control things on my hobby railroad

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Trying to learn I2C (was RS485) to control things on my hobby railroad

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