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Windows comm port
Project Guidance / Turning a Genuino Uno R3 into ...
Last post by snoferno - Today at 12:15 am
I can't seem to figure out how to Arduino keyboard hex onto my Uno. The steps I've been taking always leads to a wall I can't get around. Can someone tell me what I'm doing wrong and how I can fix it.

1) I followed this first and when I uploaded the   Genuino-usbserial-atmega16u2-Uno-R3.hex from - I would select ATMega16u2 from Device Selection on FLIP and the port would open and upload the hex file.

2) I then tested if I could upload a sketch and it would upload fine.

3) Then I tried to upload the keyboard hex from here , but when I tried to open a  port with the same ATMega16u2 on FLIP, I would get the message "Could not open USB device"

I don't know what I'm doing wrong and it's been frustrating. Does anyone know what I'm missing?
Of course it depends on the application and whatnot but are there any particular motors with encoders that people like for small/medium sized projects?

I know a lot of people use the Tamiya double gearbox for small projects (no encoders) and modified HiTec servos for basic projects (also, no encoder).

I have a few future projects which could utilize this and I figured I'd get some recommendations and start sizing by robot. Any suggestions for go-to gearbox motors with built in encoders, or suggestions on encoder modules to scab onto an existing motor?


General Electronics / Re: 60 amp relay, am I missing...
Last post by Wawa - Today at 12:13 am
Many inverters have a control pin to turn the inverter on/off.
Do you have a link to your inverter.
Maybe, but I would need at least pictures and part numbers.

lg, couka
Arduino Due / Re: SPI woes - Ethernet shield...
Last post by ghlawrence2000 - Today at 12:12 am
Hi Paul,

No, John is not using RA8875, it is 5" CPLD.

The problem I gather you are already aware of in passing, SdFat/Ethernet and SPI issues. John and I have been in communication with this issue, but I suggested he contact you directly as your understanding of the SPI library for DUE is clearly much better than mine.

The problem John is having is getting sdfat and ethernet to co-exist, since UTFT_GHL uses the same DMA code used by sdfat, it stands to reason my library will cause the same fatal error. But WHAT is the problem? Are you aware of any way (with transactions or otherwise) of getting Ethernet to not die during a SdFat file write?

We have already tried digitalPin(Ethernet_CS, HIGH); before an SD operation and digitalPin(SD_CS, HIGH) before any ethernet operations, but to no avail, that I am afraid is where my SPI knowledge ends...

Hope you can shed some light on this issue!?



Deutsch / Re: Hilfe: Byte Array in char*...
Last post by Whandall - Today at 12:11 am
Jetzt ist mir die Antwort in die Nachricht davor geraten, sorry.

War gerade dabei via Modify noch Ergänzungen anzumerken.
Microcontrollers / Re: IDE & AVRISP MKII
Last post by ron_sutherland - Today at 12:09 am
That can be set up in the Arduino IDE but it is a two step process of doing the fuse and unlocking the bootloader area, then loading the bootloader and locking the bootloader area. I was trying to do that sort of thing, but each IDE update felt like a spin loop to keep things working with the Arduino build system. To get out of the spin loop I invested some time to learn how makefiles do their magic, it was well spent.

I have tested my very simple mega328 Makefile that loads the optiboot bootloader. I just type 'make fuse' and 'make isp', which could be moreover automated with a shell script if at some point I need to do a few hundred boards.

I have not tested my mega1284 Makefile, so it may have errors lurking in it.

Again all that can be added to the Arduino IDE but I for one found it painful, and a Makefile to be so much less painful.
details is missing
I checked that, the pin was set as output. When I connect a scope it shows pulses but the pin goes from 0 to 2.4 volts.

I fixed the issue by using a transistor as a switch and connecting the output from the mega to the base. Strange enough now the pin operates at 5V just like it should.

Electronics is very confusing.
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