To use an AddOn board with Scratch GPIO – launch ScratchGPIO 5Plus rather than the normal one (They will both work fine but the plus version won’t clutter up the sensor section with unused pin names)
To specify which board you’ve got plugged in, goto Variables section and create variable called AddOn and drag it across and enter the name of the AddOn.
The current list of supported AddOns names are:
Berry, FishDish, gPio, HapPi, Ladder, MotorPiTx, Pi2Go, PiDie, PiRingo, PiRoCon, PiRoConB, PiGlow, PiBrella, Pizazz, RasPiBot2, RGBLed, RTKRPiMCB and SimPie
Some i2c based AddOns (e.g Adafruit PCF8591 ADC/DAC Board) are automatically detected and can be used all the time in addition to anything else plugged into your Pi
For full examples of how to use the AddOns – see the other menu items on this site