Game Port Connector Configuration

Below is an actual photo of Game Port Connector (RJ11/DB15M #85-227) (with a probe connected). It does require some minor assembly and can be modified to utilize all 4 analog channels "simultaneously"!!! If you chaeck other possible sources for this type of connector you will want to look for a DB15M-RJ11 part number similarity.

The gameport pin assigments that can be used for analog data acquisition are 3,6 and 11,13. Each probe will connect across the +5V pin (1).

As the probe resistance varies it controls the voltage that reaches the pin we choose (3,6,11, or 13). A simple one line BASIC program is sufficient to "ask" for the value at the appropriate gameport channel. (e.g. 10 PRINT STICK(0): GOTO 10) The command STICK(0) probes the value across pin 1 & 3 The command STICK(1) probes the value across pin 1 & 6 The command STICK(2) probes the value across pin 1 & 11 The command STICK(3) probes the value across pin 1 & 13 Below is a diagram of a simple temperature probe that can be made for as little as $2!!!