![]() ![]() The barrel jack is usually connected to an adapter. There are three ways to power the Arduino Mega Board:īarrel Jack – The Barrel jack, or 7-12V DC Power Jack can be used to power our Arduino board. Are you a beginner? Can't decide which book to read? Check out this article on Best Arduino Books for beginners How to power the Arduino Mega 2560? RESET Button-It is used to Reset the board, recommended to press it each time we flash some code to the board. It provides the basic timing and control to the board. This allows it to effectively find a balance between power consumption and processing speed.Ĭrystal Oscillator- The Crystal oscillator has a frequency of 16MHz, which provides the clock signal to the microcontroller. Even if there are any changes in the input voltage of the regulator, the output voltage is constant and steady.ĪTmega2560P : It is an 8-bit AVR RISC (Reduced Instruction Set Computer) based microcontroller that executes powerful instructions in a single clock cycle. The primary use of a voltage regulator is to control the voltage level in the Arduino board. I think it may even be showing signs of a burn in the center, but it's hard to tell.Voltage Regulator-The voltage regulator converts the input voltage to 5V. The part that looks like a 5 volt regulator looks like maybe "AMS ?17", and I can see 5.0 stamped below that on it. Otherwise, only the fan on the Ramps will turn on, and it's connected directly to the 12 volt supply.ĭo you happen to have a component layout for Mega 2560 R3? I have seen a picture with the componets labeled, but it doesn't match mine exactly. Now, I have to have the 12 volts hooked up to Ramps for it to run, AND, a USB cable to power the 2560. Normally, I'd just hook a 12volt car battery to the Ramps power input, and both it and the Arduino would work fine. The Ramps shield drives stepper motors and it requires at least 12 volts to operate. (It will do that even without the 12 volts). If I then hook up a USB cable, the 2560 will come to life. When I connect just a 12volt battery to Ramps, it pipes 12 volts through the Vin pin on the Arduino, but the 2560 will not turn on. ![]() The on-board 5V regulator is shown on the top left of the schematic. Since Vin is causing the USB's 5V to be disconnected, it sounds like MOSFET is okay but the on-board 5V regulator has been damaged. Just left of the paragraph of text is the auto-selector. ![]() My questions to those who might help me are as follows:ġ - Does anybody know how to repair the Arduino based on what I've described, (yes I can do surface mount repairs)?Ģ - If it can't be fixed, can I make a small external 5 volt regulator (LM7805 ?) that taps into the 12 volt line I'm using, and connect it directly to the USB 5 volt input - perhaps with a switch to disconnect it when I actually use a computer USB connection? I can operate my project using external power for the shield, and a USB connected to a computer if I have no choice, however the Ramps I have also has a SDram port, and I'd like to fix this so that I can have it all stand alone. There is a chip near the power jack that looks like it could be a voltage regulator, but I can't read the numbers on it, and it is not labeled on the board. I've poured over the schematics (what I could find), but I can't figure out what components handle that job, or if they are peripheral and can be replaced. I've chased power through the Ramps shield and found that it supplies the 12 volts directly to the Arduino Mega 2560 through the pin labled Vin and that the 2560 is supposed to automatically detect the external source and switch over, and I presume, regulate the power to 5 volts on board. But nothing works if I just plug in a battery, or a wall wart - either through Vin or the power jack. I've been troubleshooting the problem, and I have discovered that the 2560 does still work, and I can use the Ramps shield with a car battery to power my five stepper motors, and everything is working fine - if I have the Arduino plugged into a USB port on my computer at the same time. There was no noise or smoke or anything, so I'm thinking possible ESD, although my meter is a good one and should be somewhat protected against doing that? I am using a Ramps 1.4 shield with it, and yesterday I was taking voltage readings from the end stop pins on the Ramps. My Mega 2560 R3 was working fine up until yesterday, using a Wall Wart, a 12 volt car battery, and also from the USB connection (I wasn't using them all simultaneously though). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |