I did it, I finally found some down time to update JOS to work with current libraries from Adafruit. Below is a link to the new code on Github. A few notes to look at are listed below.

First, this is code for the Touch Shield, but it can easily be changed to the breakout board, and don’t forget to uncomment the ‘#define USE_ADAFRUIT_SHIELD_PINOUT’ line in Adafruit_TFTLCD.h file.

Also, this sketch has pin 3 setup as the backlight on the shield. This way you have PWM control over the backlight. You can accomplish this by cutting the VCC trace and soldering the PIN3 jumper on the back of the shield. You can read more on how to do that here.

This sketch has EEPROM settings, if you have not used them before, the values will be zero and need to be set. There are notes about this in the sketch on lines 92 & 93.

If you don’t know what JOS is, you can check it out here. (What’s a JOS anyway?)

Happy sketching! The code is here: https://github.com/jersagfast/JOS—TFT-Menu-System

First, I am happy to announce that the One Square Inch of Goodness and the FTDI Adapter are in the stock now and available for purchase!

In the video above, I show how I programmed the assembled kits as well as the raw TQFP IC’s without soldering anything to them. It’s a pretty simple setup, but solved the problem I was facing as well as made things a lot faster. As I mentioned in the video, pogo pins are found here, USBtinyISP here, and breadboard switch here (from Adafruit).

A note on using ICSP: – The Square Inch is designed to accept an FTDI connection for programming. Because of this, a .1µF capacitor is between the reset line of the ATmega328P and the pin labeled DTR. This is so when you load new sketches on the Square Inch, it will reset automatically via the DTR line on the FTDI adapter. When you use ICSP, you need to bypass this capacitor! Otherwise it will not work. The programming board I used in the video had the capacitor bypassed with solder (pictured below). There is also a via to the right of the capacitor that leads to the reset line. This can be shorted to the DTR pin to accomplish the same task, as I did to program the assembled boards. 

On the assembled boards, if you wish to change the bootloader or upload sketches via ICSP, you can temporarily short the cap using tweezers on the cap itself (green arrows) or the DTR pin and the via leading to the reset line of the 328 (red arrows) as shown in the picture below.

Hi peeps, I have been wanting to make a small GPS device (GPS receiver and some sort of screen) that I could carry around for a while now, but I didn’t want it to be too big, so I made this. Mission accomplished.

This unit is explained in the video above, but is basically a GPS receiver, 1 CR1220 battery for the RTC on the GPS breakout, one of my Square Inch of Goodness boards, one 128×32 OLED display, three 6mm buttons, and a 400mAh Li-Po Battery (from Sparkfun). It even has FTDI headers on it so I can update the firmware with ease (with my own FTDI adapter!). The awesome part is that all of those things fit in an Altoids Smalls tin, measuring 2.15″ (W), 1.35″ (L), and .56″ (H), or 55mm (W), 34mm (L), and 14mm (H).

The GPS breakout board is from Adafruit and uses the MTK3339 GPS module, and man does it work well. I have had other GPS modules that worked, but it was a fight. If you’re thinking about putting GPS in a project, use this. They also have a great library for it. They even have the raw MTK3339 GPS module if you want to use your board. Read the Adafruit product page for all the features, there are many.

The 128×32 OLED display is also from Adafruit, it works well and has the typical OLED crispiness. Very easy to read, even in sunlight, for the size and you can even multiply the text size if you want to.

So I’m going up to NY in a few days, and I wanted a new and exciting way to talk with the TSA folks, so I figured this would work. (kidding) If only Hollywood had not trained everyone to think a gadget with a few wires and a flashing red LED, that they didn’t understand, was a bomb.. ugh. (not kidding)

*UPDATE – there is a set on Flickr for this with teardown pictures.

*UPDATE #2 – Oops, I forgot to put the link to the code on Github. 0_0

I have been working more with 3.3 volt projects lately and wanted to make programming them with an FTDI adapter as easy as possible. Sure you can switch most FTDI adapters from 3.3 to 5 volts (the FT232RL chip has a built in 3.3 output as well as logic level selection), but it involves scratching a jumper wire and soldering pads. This isn’t bad to do once, but to go back and forth is time consuming and rough on the boards.

So, I made my own FTDI adapter with an easily changed jumper for voltage selection. I also added a power LED to let me know that it’s plugged in and ready to go, threw in some RX and TX indicator LED’s and all required caps (read the data sheet), and mini SB jack. I ordered the boards from OHSPark.com, and as always, they were great.

*UPDATE* Now available in the store!

Eagle files are on my Github page, or you can grab just the schematic in PDF format here.

Adafruit has an FTDI Friend and Sparkfun has an FTDI Basic if your not up to soldering 28 Pin SSOP packages, or just want one.

I was inspired by a video by Jeri Ellsworth that showed her using homemade flux remover. This is super simple a combo of alcohol and acetone. In this video, I use a 50/50 combo of the two. So that’s 32 oz. of flux remover for $3. I Googled flux remover and it ranges from $10 to $25 for 12 oz. So that a savings of at least about $70. I have been using this on about every board I can find and it has worked great on all of them. I heart saving money.

So a while ago I discovered that I needed a microcontroller in a really tight space. I tried an ATmega328P PU (DIP package), but try as I may, It would not fit. The answer? The ATmega328P AU (TQFP) this is a much smaller package, and for an added bonus, it has 2 extra ADC’s. This a great little board to squeeze in various projects, and opens the door to some very cool stuff I have coming up. Some of you might remember I put this board in a project I did a while ago when space was very limited. It’s just a handy little board to have on hand.

In the video above, I show some soldering with TQFP packages, as well as a little soldering with hot air. I need to figure out a way to record video from my brain. It would make things so much easier..

Oh, I almost forgot, the flux pen I used, found at Sparkfun.

The Eagle files for this board are on my Github page. Or just the schematic PDF.

This video above demonstrates the speed difference between serial enabled/disabled on an Arduino Uno while toggling a pin output. Just a really simple test of how fast it can pull a pin high and low (without using direct port manipulation), with and with out serial enabled. I think that was the smallest Arduino sketch I ever wrote..

Here is a video on SMD (Surface Mount Device) soldering. In this video I show how to solder some SMD components on to a little board with an ATtiny85V, switch, LED, and resistor. The short version of this video just shows the resistor and LED (size 603) being soldered, the long version of this video shows everything being soldered. It’s really neat to open up the world of SMD. You can make really tiny (and cheap!) widgets!

Pick up tweezers, SMD storage boxes, Panavise Jr, USB Microscope, and soldering supplies at adafruit.com.

So what are you waiting for? Go ahead, give it a try!

I wanted to do a quick post on a mod I did to a Yamaha AG Stomp. An AG Stomp is a acoustic guitar effects pedal that was made in 1994, but no longer available.

The need was this: to gain more real estate space under a keyboard that was full of pedals, controllers, and switches. So the need to switch banks without taking up the whole size of the pedal was the goal. The answer was to build a small (3.64″L x 1.52″W x 1.22″D) pedal that had a single switch, had an easy way to tell witch bank you were on, have a signal indicator, and be road tough. The end result made the customer very happy, and he requested that I share, so here it is.

You can check out Austin Biel at austinbiel.com, an awesome musician (including the best keyboard player I have heard), and an outstanding friend.

I had mentioned this device in a post about DorkboxPDX PCB’s, and didn’t do a post on it, but had some request to. This is the same as my other iPad charger, but this one includes an LDO regulator as well as a barrel jack. I have had a few request for the files, so here is all the info. Happy charging.

You can find the files at my Github page.