Micro Serial Servo not working with qik motor controller

[burnham87]

I’m having trouble with my micro servo controller and my qik motor controller. When i try to send commands to the qik, the servo controller starts to freak out. The manual says it should ignore any command that doesn’t start with a 0x80. The qik has no trouble ignoring commands. What should i do to get the servo controller to ignore commands, am i missing some setup commands.

Rob

[Ben]

Hello.

Have you followed the steps for daisy-chaining the qik with other Pololu devices as explained in the qik’s user’s guide?

f you want to daisy-chain a qik with other Pololu devices that use 0x80 as an initial command byte, the procedure becomes slightly more complicated. You should first transmit the byte 0x80 so that these devices can automatically detect the baud rate, and only then should you send the byte 0xAA so that the qik can detect the baud rate. Once all devices have detected the baud rate, Pololu devices that expect a leading command byte of 0x80 should ignore command packets that start with 0xAA and qiks will ignore command packets that start with 0x80.

- Ben

[burnham87]

Yes i did, in my start up i first did the 0x80 then the 0xAA. The led indicators on both matched what they should (qik had the green hearth beat and the micro had nothing). And when i try to send commands to the qik, the micro would start moving the servos in strange directions. But when sending commands to the micro, the servos worked perfectly.
Maybe I did not put a large enough time gap between the baud rate detection commands. Could it possibly be that I have give the micro servo controller a number ID.

[jan]

Hello.

The timing shouldn’t matter much, but trying a bit of a pause shouldn’t hurt. Can you try your test with only the servo controller connected, to make sure it’s not an electrical interference issue?

- Jan

[burnham87]

I got it to work. I must have been doing something wrong in my original code. But now they work together.