• It is able to read the Track position of the read/write head and display it on a 4 digit LED Display along with the motor rotation animation and the half track indication.
• It also works as an I2C slave device sending the current track to an external device.
• This particularly version includes also the feature to be used with a LCD 16x2 display as well.
• Trackduino2 can be easily plugged into the MOS 6522 VIA Chip socket of the 1541 mainboard without any other internal connections or modifications, since it acts as an 6522 adapter board including the Arduino Nano.
• It can be easily removed to get back the Drives stock condition.

When the Drive is powered on, the Arduino resets and waits for the Track information given from the read/write head, until then the Track number is still unknown and the Display stays on stand-by. Once the head reads data from the current track of the inserted disc, the Arduino peeks information from the 6522 VIA chip. Each track contains some data sectors, and each sector has an sector-header. The sector-header contains information about the current track and sector number, which is then driven to the display. The data that follows is then read the get the change of track by reading the data for the stepper motor.

• My Trackduino Adapter PCB (you can find the Gerber files below)

• Arduino Nano
• TM1637 4 digit LED Display
• 16x2 LCD Display (only for LCD version)
• I2C LCD module (only for LCD version)
• 1x 40pin Turned Pinheader SIL Strip
• 20-30cm 4 pole jumper wire female-female
• 40pin DIL Socket (optional)

• Arduino IDE 1.8 or later versions https://www.arduino.cc/en/software
• Arduino Libraries: (downloadable from Arduino IDE)
• DigitalWriteFast
• TimerOne
• TM1637
• LiquidCrystal_I2C (only if a LCD display is used)

Just program the Trackduino Sketch into the Arduino Nano and solder it on the adapter PCB using the strip line headers included. Use the following Sketches:
"Track_anzeige_05_lcd" for LCD mode, "Track_anzeige_04_poll" for LED display mode and "Track_anzeige_04_poll_Nano3_" only for Arduino Nano3 versions(Atmega168) and only with LED display. I reccomend to use an Arduino Nano with Atmega328 instead of Nano3 due to the smaller amount of memory. Cut the turned 40pin strip line in two 20pin strips and solder them on the bottom side of the adapter. Once done, solder the socket (but you can directly mount the MOS6522 chip on it) on the upper side of the adapter board and the 4 pole header for the display. Connect the Jumper wires from the adapter to the Display, following the pin signals printed on the silkscreen.

You can now check if the Arduino works correcty just plugging in a mini-USB B cable. The display will initializze and short after showing random tracks, since it's not connected to the Drive, but this is ok, it means it does work properly.

Insert the whole adapter into the 6522 socket of you 1541 (UC2) or 1541-II (U8) Drive and turn it on. After power on init, the Display will now show 2 horizontal lines which means it is waiting for data being read.

Insert a Floppy Disk and call the directory on your C64. You should be able to see the spinning animation and the track indicating position #18.

For now on it will display each track read by the head. You're done !