![]() In the following table, DMIPS stands for " Dhrystone Millions of Instructions per Second", and gives a rough estimate of the basic integer calculation speed of a device. Calculation SpeedĬomparing arithmetic calculation speed, and the massively higher resources of the Raspberry Pi give it a very clear win. That's up six Watts of power! There are no sleep modes available to substantially reduce this. On the other hand, Raspberry Pi consumes substantially more current, 700mA-1200mA for model B. There are sleep mode software libraries like narcoleptic that give even lower consumption. Power ConsumptionĪ standard model Arduino uses less than 100mA of current (half a Watt of power), often much less. Pi boards have a reputation for needing a very good quality 5V input, to avoid random lockups and other problems. Unlike most Arduinos whie, are fairly accommodating about exactly what input voltage, Raspberry Pi is fussy. Most Arduino models can also run on higher voltages using their onboard regulator, for example an Arduino Uno can run on anything in the range 6V-20V. The microcontroller on an Arduino has this built in.īoth a Raspberry Pi and an Arduino can run on a 5V DC input, for example from a USB charger. You can't read a variable (analog) voltage on a Raspberry Pi, without an external ADC (Analog to Digital Converter) device. This handy chart has a lot of information on it, but shows which families of input and output can work together.Įxceed the rated I/O voltage and you may see a puff of smoke as your device suddenly stops working! Raspberry Pis have a reputation for not tolerating 5V, even for a second. The opposite isn't true though, a 5V output will damage a 3.3V input pin! You need level shifting circuitry to manage the difference. A 5V input pin can also read from a 3.3V device's output pin, as 3.3V out is still "high enough" to count as a high level for a 5V input. Most Arduinos use "5V Logic", so they can tolerate up to 5 Volt levels.ĭepending on the devices you're attaching, this can be good or bad. The Raspberry Pi uses "3.3V Logic", which means that the digital pins are designed to work with no higher than 3.3 Volt levels. To make matters more confusing, there are least three different pin numbering schemes in active use for Raspberry Pi users! I/O Voltage On the Raspberry Pi, you need to refer to a reference sheet each time. Pin HeadersĬan you spot the difference here? It's subtle, but if you spend a lot of time plugging in cables you'll notice it.Īll of the pins on an Arduino are labelled clearly so you know what connector pin you're plugging in to. That's the largest fundamental difference, but there are lots of minor differences as well. ![]() For instance - configuration file errors, filesystem corruption, runaway processes locking up a system. ![]() In this case, that tradeoff is added complexity.īecause the Raspberry Pi is a full featured Linux computer in a tiny package, it is exposed to whole categories of potential problems that simply couldn't occur on a microcontroller that just runs one simple program. Power and flexibility are great, but there's almost always a trade-off. It runs an entire operating system (Linux) and all of the functions built into that operating system, not just a single program. In terms of complexity, Raspberry Pi is comparable to a desktop computer from the mid to late 1990s. In terms of complexity, it's comparable to the controller in some microwave ovens or washing machines (although probably a bit more advanced.)Ī Raspberry Pi is a Microprocessor System-on-a-Chip. It's a dedicated tiny computer that just runs your program when it starts up. The Fundamental DifferenceĪn Arduino is a Microcontroller. Except for the analog pins, a Raspberry Pi has dramatically more features than a typical Arduino for around the same price. ![]() Seen at a glance like this, the choice seems to be simple. Program Storage 32 Kilobytes SD card, many gigabytesĮxtra Interfaces i2c, SPI, USB Serial device i2c, SPI, USB host ports, camera, HDMI, composite video, audio output, ethernet ![]()
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