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KOOKYE 5PCS Pro Micro ATmega32U4 5V/16MHz Module Board With 2 Row Pin Header for Arduino Leonardo Replace ATmega328 Arduino Pro Mini
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- ATMega 32U4 running at 5V/16MHz, the maximum voltage allowed on the RAW pin is 9V, 6-7V input recommended
- Supported under Arduino IDE v1.0.1
- On-Board micro-USB connector for programming
- 4 x 10-bit ADC pins
- 12 x Digital I/Os
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Description du produit
Note: When you open the Arduino IDE software, pls go to the Tool and choose the board "Arduino Micro"
1. The Pro Micro is similar to the Pro mini except with a ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on board and do away with bulky external USB interface
2. This tiny little board does all of the neat-o Arduino tricks that you're familiar with: 4 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. Running at 16MHz and 5V, this board will remind you a lot of your other favorite Arduino-compatible boards but this little guy can go just about anywhere. There is a voltage regulator on board so it can accept voltage up to 9V DC. If you're supplying unregulated power to the board, be sure to connect to the "RAW" pin on not VCC.
3. This latest revision corrects the silk error from the last version of the board so that pin 14 is correctly labeled. We've also added a PTC fuse and diode protection to the power circuit and corrected the RX and TX LED circuit.
ATmega32U4 running at 5V/16MHz
Supported under Arduino IDE v1.0.1
On-Board micro-USB connector for programming
4 x 10-bit ADC pins
12 x Digital I/Os (5 are PWM capable)
Rx and Tx Hardware Serial Connections
Our Smallest Arduino-Compatible Board Yet
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Attention, les I/O dispos diffèrent d'un Arduino Micro "original" (on les voit bien sur les photos).
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firmware to make an active PS/2 to USB adapter.
It's interesting to note that although just shorting the ground and reset pins for a second
works just fine once I have some firmware flashed to it it doesn't seem to work on the
initial flash. Maybe this is just something to do with avrdude but I had to hold the reset
and pins together for a good two or three seconds to actually get anything to flash.
For those interested this is the command I used:
avrdude -c avr109 -p atmega32u4 -P $SERIAL_PORT -U flash:w:$HEX_FILE
Where $SERIAL_PORT is the serial port device on your system, e.g.
COMX on Windows
/dev/ttyAMCX on Linux
Where X is usually a number.
The spec for the original design of the Pro Micro is a Microchip brand LDO with a maximum operating voltage of 16vdc (thus, would easily operate with 12 volts or even 14volts put out by most vehicle alternators) and an Absolute Maximum rating of -20 to +20 volts (hence reverse polarity protection built in). These regulators can be had on Mouser for maybe 70 cents per piece. So, there are a few options to use these.
First, I want to say that when the device was powered off my USB port, it worked fantastically. I use Linux Mint as my OS and I used the official Arduino software to write my sketch. I downloaded the Pro Micro library from Sparkfun and was able to program the board directly as a Pro Micro. It seemed to run my sketches without any problem. I uploaded my firmware, disconnected from my laptop, then placed the Pro Micro into my circuit, which is powered by 12v. As soon as I switched the power on, I saw smoke coming from VR. I quickly removed power. I thought I had connected something wrong. I verified all my connections but couldn't find anything wrong so I plugged it back into my laptop (without 12v) and the lights on the device lit up, then slowly went dim, until they went out and... that was the last of it.
I spent the next 3 hours reviewing data sheets, my wiring, my code, anything I could think of to understand how I could have wired something wrong. I even began to remove the plastic standoffs from the header pins so I could inspect for hidden solder shorts - but couldn't find anything. I finally decided to check the reviews if anyone else had a similar problem, and found a few other stories that mirrored my own. My concern, and my reason for posting this detailed explanation, is that some have expressed comments similar to "It's a 5v device, OBVIOUSLY it won't work with 12v". But those comments miss the issue completely... by spec, these should operate at up to 16v which basically means that it's safe to use a power supply rated up to 12v. The problem is the incorrect voltage regulator used.
So with that, overall, I give these 3 stars because they did work. I tried to price out my cost for getting some Pro Micro boards fabbed and buying the components myself and then assembling the boards myself, but I came up with a cost of $6-$7 minimum. Assuming the Atmega chips are legit (i.e. not counterfeit), the price 3 of these for $19 is pretty tough to beat. However, if you plan to use these, know your options:
1) Don't operate these with a power supply rated over 5 volts. I would be suspicious that a 9v power supply would work for these... but maybe.
2) Replace the regulator. The Micrel Mic5225-5 is the regulator in the original design, and these can be had fairly cheaply. Or some other SOT-23-5 LDO with similar specs.
3) You could try a simple resistor divider, but I wouldn't recommend it. If I were to try it, I would start with a resistor divider composed of two 100k resistors with a 12v power supply. This should drop the voltage down between 6 to 6.5 vdc, which the regulator might be able to handle.
In the end I chose to return mine. It wasn't an easy decision, because there isn't another low cost option and these could have possibly been made to work as I stated above. Ultimately, my return window was closing, I already had one fried unit, and I had to decide whether I would assume the risk that nothing else would go wrong with these. I will also state that I was SUPER glad I didn't have this plugged into my laptop when I applied 12v ... if that 12v had fed back into my USB port I would be LIVID! Not sure if that could have happened or not, but when things start smoking... anything's possible. That made up my mind... I could risk losing the Pro Micros, but replacing the laptop would be way more difficult.
Hopefully this helps someone else.
Since the reviews can be mixed together for different boards, this is for the 3-pack of the Pro Micro ATmega32U4 5V/16MHz
avrdude -c avr109 -p atmega32u4 -P /dev/cu.usbmodem1 -U flash:w:filename.hex
Ground pin 3 and as it flashes you should see the /dev device appear. One thing to note is that sometimes it didn't release the device so when you reset it it would increment the device with a counter like modem1..modem2..modem3.. this means you have to do a quick check of the new device name or take a guess at the next number. If you don't flash it in a few seconds you have to try again. If you are using the Arduino IDE or a more modern build approach that waits for you to reset you wont have to worry.
I used these in a keyboard experiment that I'm typing this review on.
I probably can't send them back since I opened all the little bags looking for a good one with no luck. Oh Well.
The only other reason I will keep them is in the event I need a sacrificial nano I won't care about if it gets destroyed.