so panucatt is your gig Roy? Really like the design of those current sensors ... and your web site intro where you crossed out "mission critical applications" and change it to "mad scientist projects" (from memory). ... funny 

There's this guy who mentioned that he used the sensor in an experimental rocket so I was thinking JPL type stuff, but when he sent me a video of a test launch and its super awesome and qualifies as Mad scientist's stuff. I have a lot of ebay buyers from Australia, mostly for Wind/Solar and other power generating systems.

Thanks

Roy

One of my current sensors might be a fit for what you're looking for.

http://www.panucatt.com/Current_Sensor_for_Arduino_p/cs-100a.htm

Some users I've talked to are using them on electric scooters similar to yours.

Thanks

Roy

adilinden.

You read my mind! Exactly why I called the PCB I posted several posts ago a "Lander". Its part of a system of "Landers" that addresses the issues you mentioned. Hopefully I can have them populated this weekend. For a show and tell soon 

@fm - The 2 pin jumper might be an issue if someone wants to use an external power source but still have the USB connected. I noticed more power draw from the external supply (since the USB voltage is slightly lower) with this kind of connection. I would suggest a 3 pin selector jumper similar to what I used in the M1 Lander I posted if you want to give more options to the user.

Also, AVCC doesn't seem to be connected to VCC.

Other than that it seems to be ready for a round of prototypes.

I would go the crystal route too like crossroads suggested. These are high speed USB capable devices and resonators might not work well if used as such.

Fm,

Maybe Im not seeing it but how do you power the device from USB? Jumper VUSB and +5V? It looks like the VUSB is only powering the USB segment of the chip.

Nice rendering of the board. Is that a standard rendering from Eagle(Im not an eagle user)?

FM,

The crystal installed is ECS-160-20-3X-TR. I also have pads for this crystal ABM2-16.000MHZ-D4Y-T which a bit more expensive.

Good idea Bill, I'll see if I can squeeze those 2 pins.

FM, I have the boards(10pcs via itead) since last week but only built up one last night. It worked out AOK.Attached pic of assembled unit.

Awesome job guys.

Here's what I have been working on for the past couple of weeks. Similar footprint but with out the SD. Based mostly on Adafruit's 32u4 breakout and is kinda part of a prototyping system.

FM,

I would go with a Dpak with a grounded tab like crossroads suggested, it would eliminate creating a large V+ thermal pad when you already have ground pours. Here are some part numbers that you could use for this. Please check spec sheets for details. They are a little bit more expensive than the V+ tab versions.

LD29150DT50R
TA48M05F(T6L1,SNQ)
KF50BDT-TR
MC7805BDT  - this is non-LDO type

FM,

It runs the program after the boot loader ends(takes about 3~4 seconds on my board).It sets up the USB serial stuff and make use of the RX/TX LEDs. Make sure you get the latest leonardo boot loader from Arduino's Github pages, the one from RC2 is messed up.

I tried running the example serial sketch and the RX and TX LEDs flash as expected.

I changed the fuses to activate the HWB pin and running without the bootloader disables the serial and the RX/TX LEDs( but TX pin is held low so LED is always turned on)

Roy

The shrunken ATMega32U4 design I started from didn't have a TX LED so didn't tie up a pin with one either.

Hi CrossRoads, the activity LEDs should be fine. Going through the data sheet suggests so.
Any way, we will soon know I've ordered a batch for distributing to the chaps on the other thread, they should be arriving the week after next.
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fm,

I tried it already, it is ground switched when using the arduino boot loader(LED pin is always high).

Roy

Crossroads, that question was for fm. :-)

What pins_arduino.h data did you use with that?

The one posted by 32teeth (from 1.0rc2)


FM,

The way you have your TX LED wired, wouldnt that just have the LED on all the time?

Playing with these for a about 2 weeks now. Boot loader has been stable as of latest release. LED blink that comes with the boot loader is now "breathing". Adafruit's 32U4 breakout is easiest to try this out, altho I made my own version and works nicely. Nice to walk away from the pricey FT232Rl chip.