Two pics. One of the jumper link, one of the arduino and LCD.
Note the LCD adapter connector cable - needs to be right way round or it can blow the LCD.
You may well have a different LCD. I decided to use Jim's LCDadapter as the extra cost of ordering that at the same time as the TC4 was minimal. Given the number of pins on the Mega, and extra code space, a generic LCD should also work, just may need another library added. The crappy LCD I initially ordered had a link to a REALLY old LCD library - the current one I got off the net works and is much easier to code with.
The jumper takes pins SDA and SCL from the mega to pins marked AN4 and AN5 on the TC4 shield. These are for I2C signals and just come out on different pins on the Mega.
When soldering that pin header, I bent pins AN4 and AN5 90 degrees before soldering - made a good tight bend and everything fits nicely.
Mine is really simple right now - two thermocouples to the roaster. Control is still manual and separate to the arduino. Arduino power comes either from a 12VDC battery, or from the USB interface if on the laptop.
I am still using aBourbon on the Arduino and pBourbon on the laptop (under Processing 1.2.1). As these were also written by Jim Gallt, designer of the TC4, I reckoned they were the best to start with.
I plan on going to Kona for PID control in the future and firstly will add SSR control of the roast heater, controlled by the Arduino PWM, then fan control next and intend to add in control over the eject function.