Pololu Qik 2s9v1 Manuel d'utilisateur télécharger pdf (Page 10)

Demo Mode

If you short pin A to pin B (the circular pads right next to the silkscreen labels) and reset the qik, it enters demo

mode and remains in demo mode for as long as the short is maintained. Demo mode gives you an easy way to test

your qik and troubleshoot your application for potential problems. In demo mode, the qik smoothly ramps motor

M0 from stopped to full-speed forward to full-speed reverse to stopped again over a few seconds. It then does the

same for motor M1. The red (error) LED is on while motor M0 is active and off while motor M1 is active. The

green (status) LED is on while the active motor is driving forward and off while the active motor is driving in

reverse.

Demo mode can help you determine before you’ve even written any code if you have an issue with your power

supply, such as insufficient ability to supply the current your motors are drawing or interference from motor noise.

While in demo mode, any serial data that is received by the qik on the RX line is echoed on the TX line, giving

you an easy way to test your serial connection.

3.e. Indicator LEDs

LED Overview

The qik has two LEDs that are used to provide feedback about its state of operation:

• Status LED (green): This green LED provides a heartbeat to let you know that your qik is alive and what

state the qik is in, and it also acts as a serial activity indicator.

• Error LED (red): This red LED is tied to the ERR output pin and lights when the ERR pin drives high in

response to an error. Once an error occurs, the LED remains lit until a serial command is issued to read the

error byte, at which point the LED turns off. For more information on the possible error conditions, please

see Section 5.b.

Automatic Baud Detection Phase

When the qik first starts up in automatic baud detection mode, it enters a phase in which it is waiting to receive the

byte 0xAA (170 in decimal) at a baud rate that is within the range of 1200 bps to 38,400 bps. If the serial receive

line, RX, is pulled high, as is expected for an idle TTL serial line and the default state of an unconnected RX, the

green status LED flashes on and off evenly every 0.4 s. If the serial receive line is held low, this is indicative of a

bad serial connection and the red error flashes on and off evenly every 0.4 s (with the green status LED off). Once

the baud is detected, this phase ends and the qik proceeds to normal operation.

Firmware version 2 only: If a serial byte other than 0xAA is received in this mode, or if 0xAA is transmitted

at an invalid baud rate, the red error LED turns on and stays on until the automatic baud detection phase ends.

This gives you feedback that the baud has not yet successfully been set and the controller is still in the automatic

detection phase. Firmware version 1 flashes the red LED very briefly if a serial byte other than 0xAA is received

in this mode, which can make it difficult to tell that the qik detected any serial activity.

Normal Operation

In normal operation, the green status LED very briefly flashes a heartbeat every two seconds. If any serial activity

is detected, the green LED turns on until the next heartbeat turns it off. If a serial error occurs, the red LED turns

on and remains on until you issue a get-error command (see Section 5.b).

Demo Mode

In demo mode, the LEDs will cycle through the pattern:

1. red and green ON

3. Connecting the Qik Page 10 of 24

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Pololu Qik 2s9v1 Manuel d'utilisateur Page 10