Display
We used the Parallax BPI-216 Serial LCD Module for the display output. The LCD connects to power, ground, and any I/O pin on the Javelin Stamp, and not only provides a 2.4 or 9.6 Kbps, one-wire interface to the processor, it also responds to a number of commands to clear, scroll, and address the cursor to locations on the display.
Figure 11 shows the LCD displaying output from our software. At the point we took the photo, we’d just started up the fire. The ADC was reading a very low value, below the linear region of the thermistor, and the computations were therefore driving the fan to the full speed state.
FIGURE 11: LCD display