Hi, Unfortunately BB-xm does not carry TTL signals so you will need some level converting interface. Guess that it is the same with BB.
You might want to use the serial port - then you need RS-232 to TTL level converter and you have to make sure that during initial bootup your peripheral stays disconnected. Or you might want to use some GPIO - they are 1.8v (2.8v for BB?). You might setup pins in such way that you route some other serial port to GPIO. In any case you will need a simple single transistor level converter. I have to do a similar thing in the future and I am going the analog way- there is a plenty of I2C controllable DAC's (dual/quad channels) which you will only need to connect to power supply, to I2C bus and driver board - no other components are need. So in hardware it is almost as well simple, but in programming it is going to be much much easier. Hope it helps, Shavkat On Friday, January 3, 2014 5:16:19 AM UTC+1, Simon Engler wrote: > > Hello, > > I am trying to connect my beagleboard up to a sabertooth 2x10 > > http://www.dimensionengineering.com/products/sabertooth2x10 > > It is best for me to communicate through simplified serial if possible. > Description below. > > Could someone point me in the right direction? > > Thanks. > > > "Simplified serial uses TTL level single-byte serial commands to set the > motor speed and > direction. This makes it easy to interface to microcontrollers and PCs, > without having to > implement a packet-based communications protocol. Simplified serial is a > one-direction only > interface. The transmit line from the host is connected to S1. The host’s > receive line is not > connected to the Sabertooth. Because of this, multiple drivers can be > connected to the same serial > transmitter. If using a true RS-232 device like a PC’s serial port, it is > necessary to use a level > converter to shift the –10V to 10V rs-232 levels to the 0v-5v TTL levels > the Sabertooth is > expecting. This is usually done with a Max232 type chip. If using a TTL > serial device like a > microcontroller, the TX line of the microcontroller may be connected > directly to S1. > > Because Sabertooth controls two motors with one 8 byte character, when > operating in Simplified > Serial mode, each motor has 7 bits of resolution. Sending a character > between 1 and 127 will > control motor 1. 1 is full reverse, 64 is stop and 127 is full forward. > Sending a character between > 128 and 255 will control motor 2. 128 is full reverse, 192 is stop and 255 > is full forward. > Character 0 (hex 0x00) is a special case. Sending this character will > shut down both motors." > > > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
