48 June 2014
■ FIGURE 16. If you installed
the optional grounding wire,
you can connect it to the VSS
connection on the board.
■ FIGURE 17. Here, the Home Work board is ready for
testing. For those wondering about the built-in series
resistors on it, they do not affect the overall resistance in
the RC circuit enough to alter the test results adversely.
Testing the Exceptions
In the following examples, we’ll be testing a
Home Work board which includes a surface-mounted
Stamp 2 installed on it. For this, we’ll use the card tester
since it can connect to the 16-pin SIP socket on the
board, connecting to all 16 I/O pins and providing the
RC circuit required by the test code.
■ FIGURE 15. The card tester plugs in as follows.
■ FIGURE 14. In this example, a BS1 is installed in the
socket on the left and a BS1 serial adapter is connected to
download the BS1 test code. In this case, the lower LED
indicates the BS1 regulator has power. Note: Due to
architectural differences between the Stamp 1 and Stamp 2
line, there is a different program (and, as you can see, a
different socket) for testing the BS1 module. You must also
still use the BS1 serial adapter.
■ Stamp card tester schematic.
