In that case the internal 5V regulator is bypassed and the current available through the 5V pin is the regulated supply current. Or you can use a 5V regulated supply (DC-DC convwerter) connected to the 5V pin. The Arduino uses around 50ma of that leaving less than 90mA (max) for everything else. So with 12V into the regulator the max current is about 140 mA (1W / (12V - 5V)). The recommend max power dissipation for the regulator is 1 Watt. The higher the supply voltage the less current that the regulator will supply before overheating and (hopefully) shutdown. If powered through the Vin pin or power jack, the current is provided by the internal regulator and the current that you can draw from the 5V pin depends on the voltage supplied at the Vin pin or power jack. If powered by USB, the internal 5V regulator is bypassed so you can draw about 500mA from the 5V pin. There are different ways to power the Mega and different ways to draw power from the Mega. I'm not noticing any overheating issues with my MQ-3 contrary to the second link I cited.Īnd this may be a stupid question, but if the limit is 200mA per 5V pin, and I want to connect multiple sensors drawing around 150mA, am I able to connect the multiple 5V pins and grounds to the same circuit in a parallel fashion to reach the max? I'm working with the various MQ sensors for fun, and I'm trying to figure out how many I can connect to one board. "The voltage about 12V and current above 200-300mA cause its heating." Do the regulators really overheat when drawing much less than their max?īudvar10 seems to make a similar claim in this link. Granted, they don't mention the mega specifically, but I see the max for the Uno is 400mA. The regulator on a typical Arduino will overheat if you try to draw this from the Vcc pin." This link says 800mA is the max, or 200mA per pin. I'm also unsure of the best place to post this as it's more of a general Arduino Mega question than it is a sensor question. I'm a novice and I really don't understand max current draw when it comes to the 5V pins.
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