by waking the ATMega32u4 frequently to keep the connection alive? Or is there some not-as-deep sleep moden where the USB connection stays alive? Is there some way to keep the USB connection alive while still conserving energy? E.g. That's not really acceptable in this application, since reconnecting USB after the Arduino wakes takes pretty long (a second or two). To reduce power consumption, I put the Arduino to sleep, but that disconnects USB. The following link is for the Arduino Micro which is very similar: Additional Info on Arduino.I am using an Arduino Pro Micro (basically a Leonardo in a smaller form factor) in a mobile application where power consumption is really important. Sample inspected and tested per incoming shipment using ‘Blink’ program with external LED attached to pin 9.BEFORE THEY ARE SHIPPED, THESE MODULES ARE: Pulling up on the cable can potentially lift the connector off the board. I would not recommend the Pro Micro for a first Arduino as it is not quite as fool-proof as something like the Nano if you want something on the smaller side.Īs with any boards that use the Micro-B USB connector, be sure to push/pull the USB cable straight in and out to avoid possible damage to the on-board connector. This feature can make the device a little more frustrating to use than other Arduinos until you get used to the quirk. ![]() The COM port will generally identify the device as ‘Leonardo’. ![]() If you experience issues with downloading, ensure that the current COM port is selected in the IDE. These are clone assemblies with good build quality.īecause of the Leonardo architecture where the main processor is also the USB port, the PC may reassign (re-Enumerate) the COM port if the board is reset or between downloads or USB cable re-connections. If it is desired to solder on the headers, it is easiest if the headers are first placed into a solderless breadboard to hold them aligned while they are being soldered. The headers can be optionally soldered onto the module if using with a breadboard. These do not come soldered for maximum flexibility depending on how the module will be used. The board comes with 2 male header strips. To program with the Arduino IDE, use board type: ‘Leonardo’. Like all Arduino and compatible boards, it can be programmed using the Arduino IDE via the USB port. There is no on-board general purpose LED. There is a green power LED on the board and 2 red LEDs which show activity on the TX/RX lines. It is not recommended to use input voltages greater than 12V as it will cause the on-board regulator to work harder and may cause it to overheat. If an external 7-12V power supply is used, the power should be input on the ‘RAW’ pin which feeds an on-board 5V regulator. The board operates at 5V which can be supplied via the Vcc pin or through the USB port connection. If it is necessary to reset the board, the reset pin should be momentarily grounded. The board also does away with the reset button and ICSP header to minimize the footprint. The board has a USB Micro-B connector and the USB interface is contained within the ATmega32U4 chip and does not require a separate USB chip like most Arduino boards which helps to keep the size small. The Micro Pro uses the same ATmega32U4 processor as used on the Leonardo boards. ![]()
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