DM300018 datasheet(22/115 Pages) MICROCHIP

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dsPICDEM 2 Development Board User’s Guide

DS51558A-page 16

2.4.3

Observe Sample Application

To run and observe the sample application follow these steps:

Plug the 9 VDC cable into the DC IN connector (J4). The PWR ON indicator

should illuminate.

Press the RESET ALL pushbutton (S1). The LCD displays the current tempera-

ture and voltage values, which represent the A/D conversions from the tempera-

ture sensor and potentiometer, respectively.

The LED indicators (D3 and D4) should initially be off and then start to blink.

Touch the temperature sensor for a moment and observe the temperature read-

ing. It should increase as your finger warms the sensor.

Adjust the potentiometer clockwise and observe the voltage reading increase.

Then readjust it counterclockwise and observe the voltage reading decrease.

Observe the HyperTerminal screen and note that the information is updated to

match the LCD (see Figure 2-3).

FIGURE 2-3:

TYPICAL HyperTerminal® SESSION

Press pushbutton S5 (INT0) once and note that the rate at which D3 and D4 blink

changes. As you press S5 again, observe that the blink rate cycles from

extremely fast (both LEDs appear to be on) to fast (blinking rapidly) to moderate

(blinking slowly) to slow (appear to be switching on and off).

Press pushbutton S6 (INT1) once and note that D3 and D4 blink alternately. As

you press S6 again, note the LEDs cycle between blinking together and blinking

alternately.

dsPICDEM

™ 2 Board

T=+18C

Pot=3.42v

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