![]() ![]() Why? Because there is a diode between the 5 V line on the USB connector and "5V" on the Nano and you do not want it dropping the voltage or being subject to the full LED current. You connect the USB cable to the same connections as the original USB socket but you connect the LEDs (with their resistors) directly to the 5 V on that USB cable. Wiring an external mini USB to Arduino Nano. If you wire it to be supplied with 5 V down the USB cable, the USB source would need to be capable of supplying the full LED current, whatever that is. The transistors should be wired as common-emitter with the LEDs in the collector, in which case for 7 V, you could use pairs of LEDs in series. As a result, you are losing something like a Volt down, and that from 5 V, not 7 V, so for a given resistor value the LED current will be much lower. The controlled LEDs are driven by emitter-followers which also have base resistors. That may or may not be because of a major foul-up in the circuit! The Nano can be powered via the Mini-B USB connection, 7-12V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The Arduino Nano comes with pin headers that allow for an easy attachment onto a breadboard and features a Mini-B USB connector. They'll be dimmer than a fully-charged 7V battery. Power: The Arduino Nano can be powered via the mini-B USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). ![]() Of course, your LEDs won't be as bright running from 5V. Small mini-B USB for programming and serial monitor ICSP header for direct program download Standard 0.1 spacing DIP (breadboard friendly) Manual reset switch. ![]() I was also thinking I could solder directly onto the attached mini usb's pins, but this could go wrong quite easily. I've attached my schematic for reference - what I'm trying to do is substitute the 7v power from a battery which you can see on the schematic, for powering directly through the Arduino's mini usb. Is it possible just to get another separate mini usb connector and solder some wires from the separate connector pins, and directly onto the Nano's pins? If so, would this have to be to VIN and GND, or 5V and GND? I believe USB only provides 5V, which makes me think that using VIN wouldn't work? If I use 5V, I also need to use the 5V pin for a potentiometer which will be used to control several LEDs (30 to be precise) - would everything still work correctly, given my circuit? My Nano has a Mini USB which should be quite easy to replace. There is no room for an extension cable inside the enclosure. Hello, I want to replace all Micro and Mini USB Ports in my home with USB-C. CH340, CP210X, CY7C65213, etc.) that can be used to upload code to the Arduino Pro Mini. Note: Besides the FTDI that is used in this tutorial, there are other USB-to-serial converters (e.g. Hey everyone! I'm using an Arduno Nano for a project, and need to extend the reach of the mini usb to outside of an enclosure (whilst keeping the Nano inside). The absence of this circuit means an external component, the FTDI Basic Breakout or any USB-to-serial converter, is required to upload code to the Arduino Pro Mini. ![]()
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