The boards for the Atmel-328 based ADC board are here. And it works, only the LED connection was on the extra pin used by the 20MHz-version of this design. Corrected in software, already.
To get the board running with scratch, you need my scratchClient software.
Functionality are – with the firmware – 2 adc channels, frequency counter, impulse counter and infrared control. The two rotary encoders are prepared, but not yet coded.
The board uses 1206-size SMD components, just the size you can solder without a microscope.
JP1 is usually open, and connects GPIO4 to clock input. See flashing instructions.
SV1 is to the RPi
SV2 is ADC input. 1 = GND, 2 = GND, 3 = ADC0, 4 = ADC1, 5 = VCC, 6 = VCC
SV3 is usually open. It allows to connect RX, TX with those of RPi. It is aligned to allow to connect with two jumpers. I used this mainly for debugging purposes.
SV4 is the frequency measurement input. 1 = GND, 2 = input, 3 = VCC
This project is no kickstarter, and I do not sell this pcb.
So setup the parts on a breadboard, and if you like it find one of the reasonable cheap, long delivery time vendors in the world and build your own copy.