Interesting subjects, though! Some of the difference are very well known like smaller bootloader size, faster flash programming by UNO, replacement of FTRL with Atmega8u2, however I would like to explore more on the technical and implication part. Though eeprom can always be updated through user code. Sponsor: www. This is a check in bootloader to know the source of reset and react accordingly. Hence if uC enters bootloader due to watchdog reset or brown out reset it immediately leaves bootloader and jumps to main program.
The Arduino Duemilanove has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board.
A SoftwareSerial library allows for serial communication on any of the Duemilanove's digital pins. The Arduino software includes a Wire library to simplify use of the I2C bus; see the documentation for details. The Arduino Duemilanove can be programmed with the Arduino software download.
For details, see the reference and tutorials. The ATmega or ATmega on the Arduino Duemilanove comes preburned with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the original STK protocol reference , C header files. You can also bypass the bootloader and program the microcontroller through the ICSP In-Circuit Serial Programming header; see these instructions for details.
Rather then requiring a physical press of the reset button before an upload, the Arduino Duemilanove is designed in a way that allows it to be reset by software running on a connected computer. When this line is asserted taken low , the reset line drops long enough to reset the chip. The Arduino software uses this capability to allow you to upload code by simply pressing the upload button in the Arduino environment.
This means that the bootloader can have a shorter timeout, as the lowering of DTR can be well-coordinated with the start of the upload. This setup has other implications. For the following half-second or so, the bootloader is running on the Duemilanove. Could you please give some ideas? I don't know what else to do but really need to make LCDs run on Duemilanove! This means that the problem can not be the power but something more evil! I more suspect my old chips. Edit: suspicion increased on old chips: I have some ESP modules.
I drived them on UNO and they work as expected. They fail on both my old chips. Perhaps something is wrong by those chips but what? So perhaps my old Duemilanove has some slight problems that it works with motors, sensors etc. Did you change the 'board' setting in the IDE? The bootloaders may be different. Hi, Thank you for respond I really need it now! I attach output of both Duemilanove and UNO in screenshot. What can I test please? If that is not the problem, can you make photo's of the boards with the display?
Could you suggest any test please that could hopefully reveal what the problem is? I also attach an image of my lcd for reference. The Uno and Duemilanove are pin-to-pin compatible. The womart displays are on the forum for heaving troubles: Perhaps there is a difference in power, do you see a potentionmeter?
Meanwhile if any other test comes to your mind please kindly let me know. Thank you. Thanks everybody, I'd try to soon return to this post with new information! Duemilanove reads the chip driver wrongly as Could you please give some ideas? Duemilanove reads the chip driver wrongly as Could you elaborate on what you mean by this?
Also, there are some more point I further found: my UNO has a 12k crystal while both my custom and original Duemilanove own 16k ones my UNO is brand new, but both those boards are old and chips Atmega PU I replace all those I have are some years old even though in working state.
Maybe there indeed is a problem in all my chips! Hello again and thank you all for your support, I finally did the test with my LCD and a brand new Nano and all ok. Anyway, as new Nanos work and are cheap to plug in every such project, no question remains. Thank you again, you all and Arduino!
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