TT066: Horowitz RFDet I2C Test Jig

This tests the HoroI2CAdapter board by putting it into a TipTop1590G slot and running Arduino code, which polls 16 input lines and sends the result in ASCII out the USB serial port once a second.

To use, plug it into a Windows computer.  The power LED should glow steady green.

Then, using a terminal emulator, Python program, or anything that can open a coms link, identify the instrument's coms port.  It should say something like "Arduino MKRZERO".  Once opened, the Arduino will transmit four 4-bit hex numbers every second.

Here's the schematic of HoroI2CAdapter:

The star is the SC18IS602B I2C to SPI converter.  In this version, shift registers U4 and U6 emulate an SPI interface.

Here's the Arduino code to control the board:

This pic shows the test setup:

The input lines are all brought out to a solderless breadboard.  The user can move the jumpers individually from the "0" to the "1" position.  LSB is on the left in this picture.  "0" position is on the bottom.