![]() ![]() They will set you back about two bucks and change (buy a few, as it's only a matter of time before you need two at once or lose one).īe sure to avoid the (usually $1.xx) black ones without the switch, and any adapter where the picture shows a jumper between two pins on the 6-pin header - those don't break out the DTR pin, which is needed for programming an arduino. The model of serial adapter I use and recommend - search ebay for "ch340g 6pin" (without the quotes), and go for the ones where the picture shows a black serial adapter with a little switch (this sets voltage) and a mysterious button (i don't know what it does, heh), or green pcb with micro usb connector and voltage switch (the latter is IMO better, since you can put it on the end of a common usb cable, which we all have boatloads of, instead of a bulky A-type extension cable, but they are scarce for reasons I don't understand, while the black ones are easy to find). Unfortunately, the upload speed is the same for the two versions (as opposed to the common strategy of using the same bootloader image, and just halving the baud rate for upload at 8MHz), so you don't get stopped at upload if you selected the wrong speed. This is a 5V Arduino running the 16MHz bootloader (select Arduino Duemilanove w/ 328 within the Arduino software). It sounds to me like you are using an 8MHz pro mini, but a 5v serial adapter, so the whole thing is running at 5v and 8MHz. Its essentially a 5v Arduino that runs an 16 MHz bootloader on a super small, super thin board. ![]() Only the (crappy, underpowered) regulator is 3.3v, and that is only used for power coming in through the RAW pin (and is only suitable for very low current) Adafruit Industries, Unique & fun DIY electronics and kits Arduino Pro Mini 328 - 5V/16 MHz : ID 2378 - The Arduino Pro Mini is SparkFuns minimal design approach to Arduino. The pro mini will run on whatever voltage is supplied to the Vcc pin (assuming it's high enough for the chip to run at all), and will run at 8MHz or 16MHz depending on which resonator is used. A six pin header can be connected to an FTDI cable to provide USB power and communication to the board. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, an on-board resonator, a reset button, and holes for mounting pin headers. ![]() On the pro mini, the Vcc pin of the serial adapter is connected directly to the power rail. The Arduino Pro Mini is a microcontroller board based on the ATmega 32 8. The output of an Arduino pin - when set by the program to be an output - is in the form of a 'latch' when the program tells it to be a logical '1' or HIGH, then it switches to 5V and stays there until another program instruction tells it to be a logical '0' or LOW, at which point it switches to 0V (and can 'sink' the rated amount of current fro. measuring the vcc pin tells you nothing about the pro mini when it's powered through the 6-pin header! ![]()
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