![]() While it seems this may not be a major problem, do this at your own risk. That being said, I've been able to plug the 3.3V board using the same 5V cable that I did for the 5V board and program it without issue. If you're using a 3.3V board, it's proper to use a device with a 3.3V source, such as this FT232RL UART Breakout Board that can switch between 3.3V and 5V. Here, I’m using a Macintosh, but Linux or Windows should be similar. Hit the upload button, and a few seconds later, your board should be obediently blinking. Plug the cable into your computer, and select the proper port, as well as the voltage and processor type. For orientation, when using 90º headers, place the solid side of the header up, as I did, or remember that black is ground and green is RTS. Programming pins conveniently line up with the Pro Mini’s header, so the order is simply a matter of plugging it in the correct way. More on programming the 3.3V board below. With the exception of the 5V pin, these cables are compatible with both the 3.3V or 5V dev boards. ![]() It features a 5V power supply, along with RX, TX, RTS, and CTS pins that operate at 3V logic levels, but are 5V tolerant. For my experimentation here, I used an FTDI Serial TTL-232 USB Cable from Adafruit Industries. In the world of Arduino, it seems that once you can blink the LED as a "hello world," everything else is just details. Given the benefits of these little boards, let's first address how to program them. These boards can also be quite power-efficient, which we'll discuss shortly. So, if you happen to, say, crack one mounted to your drone in a crash, at least that component is easily replaceable. These boards are available in the 3.3V version, and come in a 5V version as well. ![]() This should shave off a bit of additional weight - if that's critical for your application. 91 in 2, its footprint is roughly 1/6th that of the Arduino Uno, with a thinner PCB. While it won't supplant the Uno as the de facto first maker board, if you are a bit more advanced and need something small, efficient, and cheap, the Arduino Pro Mini is a great choice. The downside is, you'll need a special cable for making the connection, which can pose a bit of a difficulty for beginners. This configuration also does away with the expense of the onboard chip itself, as well as the extra power requirements for something needed only intermittently. This does away with the onboard USB-to-Serial conversion, and offloads onto a device that can be plugged in and powered up only as needed. This little board has a series of six pins on one side, into which you can plug an FTDI cable for serial data transfer.
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