Re: [Oap-discuss] issue reading odometry

[Dafydd W. <daf...@gm...>]

Hi Scott,

Yes, pin 14 should be connected to +5V and pin 7 should be connected to GND
(0V).

It's customary not to show the power supply pin connections of ICs on
circuit schematics to avoid clutter, but you mustn't forget the power when
laying out the PCB :-)

Regards,
Dafydd.
 On 19 Nov 2013 02:35, "Scott Crawford" <rob...@gm...> wrote:

> Hi Dafydd,
>
> I'm not receiving valid odometry data from the "read_odometry" function in
> oap-motor.c.  However, the i2s_smbus_read_block returns exactly 5 bytes.
>
> Can  you tell me if pin 14, Vcc, on the 74HC74 (U3 and U4) need to be
> connected to +5V?
>
> Some references:
> 1. 74HC74 datasheet for a 74HC74 with preset and clear:
> http://www.fairchildsemi.com/ds/MM/MM74HC74A.pdf
>
> 2. odometry input signals
> http://www.openautomaton.org/index.php/MCM
>
> 3. Your original oap 0.1 schematic and my rework for pcb design are here:
> http://www.openautomaton.org/index.php/Schematics
>
> Thanks for your help.
> --scott
>
>
>
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