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A device which includes a central processing unit (CPU), memory, and (generally) an assortment of I/O peripherals (UART, ADC, DAC, general-purpose I/O, I2C, etc.) in a tightly-coupled standalone package.

12
votes
There might be a bit of confusion as to what Arduino is: Arduino is not just the hardware platform, but also a set of software that allows the same code to run on most/all of Arduino-compatible boards …
answered Apr 24 '13 by angelatlarge
11
votes
3answers
I would like to know what are the reasons for choosing bipolar junction transistor (BJT) versus a field-effect transistor (FET) (MOSFET or a JFET) to switch a load from a microcontroller. In our … hypothetical situation, assume that the load requires more current than the microcontroller can provide, and the question is what considerations would bias in favor or against the BJT and a FET switch …
asked Apr 17 '13 by angelatlarge
9
votes
I am not a PIC person, but normally for serial standard you need three lines: Send (TX) Receive (RX) Ground (GND) Since you dont need RX, you could use the circuit ground and use pin 3 for TX, if …
answered Apr 22 '13 by angelatlarge
7
votes
The reality is that you most likely did fry it. We can think about it this way: you supplied much more voltage to it than it was designed to handle, and now it doesn't respond to your computer. What o …
answered May 4 '13 by angelatlarge
6
votes
2answers
I am building a battery-powered uC circuit with an RGB LED. The LED is common cathode, so the circuit for switching the LED elements has to be high-side. The LED is a higher-current LED, so it cannot …
asked Jan 1 '16 by angelatlarge
4
votes
It depends on the programmer you will use the second time you program the chip. To use an ISP programmer (such as the USBTinyIPS), the chip needs to be running and functional to be programmed. If you …
answered Apr 5 '13 by angelatlarge
4
votes
4answers
I am building a Persistence of Vision project with 120 RGB leds (=360 total lines to be controlled). We have settled on the TLC5940 for driving the LEDs (and could be open to changing this), however, …
asked Mar 31 '13 by angelatlarge
4
votes
The choice between the platforms Arduino is an open source platform built (mainly) around on AVR (ATmega) chips, with one exception: the Arduino Due is built around as Cortex-M3 CPU. It is programme …
answered Apr 18 '13 by angelatlarge
3
votes
I agree with DrFriedParts answer completely, however, I do want to add that, you can indeed read PORT to find out whether the port/pin is configured as OUTPUT high or low (when DDR = 1, port/pin confi …
answered Apr 26 '13 by angelatlarge
2
votes
If the connection is going one way: from 5V to 3.3V, then in addition to a dedicated chip, a variety of voltage shifting techniques are available, as described in this post. The most relevant (cheape …
answered Mar 12 '13 by angelatlarge
2
votes
While PeterJ's answer is almost entirely correct, there are a number of limited cases that fall outside of that generalization: in some very limited ways, your MCU does have ways of doing more than on …
answered Apr 27 '13 by angelatlarge
1
vote
The diodes at the bottom are indeed zeners. They have 5.1V breakdown voltage. The reason they are there is to make it so you can actually program your chip instead of zapping it with 12V (see below). …
answered Apr 20 '13 by angelatlarge