Eight User Keys; Uln2003A For Step Motor And Buzzer - LogiFind easyAVR128 User Manual

easyAVR128™ Development Board Users Manual
PORT pins. An active LED indicates that a logic high (1) is present on the pin.
In order to enable LEDs, it is necessary to connected them to the appropriate IOs Port via connector (CN1) using
dupont wires. The CN1 connector does not be connected to any IOs, and it makes your experiments more flexible.
Figure 2.5: LEDs

Eight User Keys

The logic state of all microcontroller digital inputs may be changed using push buttons. In this application, 8 user
keys requiring eight IO ports.
Figure 2.6: User Keys

ULN2003A for Step Motor and Buzzer

The ULN2003A is high5voltage high5current Darlington transistor arrays. Each consists of seven npn Darlington
pairs that feature high5voltage outputs with common5cathode clamp diodes for switching inductive loads. The
collector5current rating of a single Darlington pair is 500 mA. The Darlington pairs can be paralleled for higher
current capability. Applications include relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas
discharge), line drivers, and logic buffers. We use the ULN2003A to drive a Buzzer and a Stepper Motor (Figure
2.7).
Figure 2.7: ULN2003A Drive Module for
Step Motor and Buzzer
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