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SparkFun will be closed for Labor Day (9/7/2015). Orders will resume shipping out on Sept 8th. Have a great weekend!

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Dr. Bogger

Member Since: July 6, 2011

Country: United States

Profile

Spoken Languages

English & Geek-ish

Expertise

Jack of All Trades, Master of None!

Interests

Anything Electronic!

Websites

http://www.spaelectronics.com

  • Will this work with a 220 Ohm resistor on the transistor base?

    The datasheet says to use 180 Ohm, but the closest I got is 220 Ohm.

  • My only complaint with this, is they could have done better with the Button Debouncing.

    It gets annoying when I try to enter “200 Hz”, and when i go to press the “2”, it enters “22222”. Very annoying, but nothing I can’t deal with. Also, the Rotary Encoder wheel tends to skip backward quite often.

  • Okay, I did this also, and works fine for me. I have an actual usbTinyISP from ADA Fruit, used the same steps you posted above, and works fine! Output seems to work fine as well.

    P.S. I really like the new SWEEP function!

  • Yes, I am wondering the same thing!

  • I bought this to make the classic “Oh Fudge!” Prank.

    I didn’t want to spend $28 on a ADXL345 Accelerometer, when the MMA8452Q is a much cheaper. The only down side to the MMA8452Q, is the lack of a Arduino Library for it.

    So, I decided to offer the Arduino Code I used to make the “Oh Fudge!” using a MMA8452Q.

    Here it is: http://pastebin.com/JKPSFxAe

    I hope that helps all you “Oh Fudge!” Makers!

  • I bought these to make the classic “Oh Fudge!” Prank. Well, I can honestly say that these are MUCH louder than I expected them to be.

    I also didn’t want to spend $28 on a ADXL345 Accelerometer, when the MMA8452Q is a much cheaper alternative. The only down side to the MMA8452Q, is the lack of a Arduino Library for it.

    So, I decided to offer the Arduino Code I used to make the “Oh Fudge!” using a MMA8452Q.

    Here it is: http://pastebin.com/JKPSFxAe

    I hope that helps all you “Oh Fudge!” Makers!

  • Yes, but the UVLO on the Powercell is set at 2.6v, and the UVLOof the battery (According to the datasheet) is set at 2.75v… So the battery’s UVLO would kick-in before the one on the powercell would..Plus I let it sit to charge for over a day, and it didnt charge at all.. so idk, but what I did above did get the battery working again…

    Plus, I have a 2.5M Ohm replacement resistor on the way that I’m going to replace the default 2M Ohm with, to increase the UVLO to 3v, instead of 2.6v.

    This should help prevent this problem from happening again.

  • The LiPo Battery itsself was reading 0v, because the internal built-in UVLO in the battery was active.

    So what I did was hooked up a Multimeter to the battery wires, and with the charger hooked up to the battery, I was only reading 0.5v.. So I took a CR2032 Coin Cell Battery, and connected it parallel with the battery for a split second, that kicked the charger to start charging the battery… I watched the battery voltage slowly increase on the Multimeter. I had to re-connect the CR2032 a couple of time, cuz the charger suddenly went back to 0.5v. Once the battery was above 3v, everything went perfectly fine!

    So I’m assuming this is a fault with the MCP73831T IC.

  • What is the “y = x/204.6;” calculation for? Does this have to do with the 100k resistor?

    Edit: Nevermind, i figured it out.

  • I got the new board today. I disabled the UVLO by closing the jumper, and it still won’t charge my battery??

    I dont know what else to do… I need to get this system back up and running, but idk what to do..

No public wish lists :(