Hi I am also trying the same thing with beaglebone black but don't have level shifting board handy and and may take some time when i order from sparkfun but meanwhile does L298 accepts 3.3v from GPIO and PWM ports ?
thanks, Digish On Monday, 12 December 2011 18:55:32 UTC+5:30, Gerald wrote: > > It is not totally clear, but it sounds OK. Schematics work better. Make > sure you level shift the 3.3V control signals to the L298. > > Gerald > > > > On Sat, Dec 10, 2011 at 8:15 AM, Emre <webse...@gmail.com <javascript:>>wrote: > >> Dear Gerald, >> >> Thanks for your valuable suggestions. >> >> Actually I have a vehicle with its motors and batery mounted, but >> there is no driving circuit or driving logic on it. >> >> It has two motors that works with 7.2V DC on it and each of them draws >> at most 350mA (peak current). The vehicle already has a 7.2V battery >> on it. Since I am planning to use same battery for both the vehicle >> and Beagle, I have replaced the battery with another 7.2V lion battery >> that is 2500mAh. To supply Beagle's power, I am planning to use a >> swithcing voltage regulator circuit that converts 7.2V to 5V using >> LM2596 by NS and filter the output. The same 5V output will be used to >> supply L298 (Vss is logic supply voltage of L298, not the source for >> motors). >> >> My total peak current draw is around 2000mA: >> DC Motors: 350mA +350mA = 700mA >> BeagleBoard and its peripherals: 1200mA >> Others: ~100mA >> >> With the help of your suggestions, I decided to implement the above >> configuration. Is there any other things that I should concern? >> >> Thanks, >> Emre. >> >> On 10 Aralık, 03:25, Gerald Coley <ger...@beagleboard.org> wrote: >> > See below. >> > >> > Gerald >> > >> > On Fri, Dec 9, 2011 at 2:48 PM, Emre <websena...@gmail.com> wrote: >> > > Thanks for your suggestions. >> > >> > > I am planning to supply input current of L298 (Vss) from the same >> > > battery that supplies Beagle's power. >> > >> > Motors are noisy. It depends on the cuurent of the motors. Make sure >> you do >> > not exceed the current and I would add some filtering and capacitance to >> > keep the 5V rail from being hit to hard with the changes in the loads >> from >> > the motors. >> > >> > > Is there any disatvantage of >> > > this, or is it better to supply L298's current from the Beagle's >> > > voltage access points (Figure 84. on BeagleBoard-xM System Reference >> > > Manual)? >> > >> > Overall it would be better to supply the moto from an external supply if >> > possible, again, depending on the current. I would definitley use the >> > VDD_5V rail for this if you plan not to use an external supply. >> > >> > > By the way, do you mean DC_5V by "VDD_5V rail", which is the >> > > second pin of expansion connector (Table 22. on BeagleBoard-xM System >> > > Reference Manual)? Is it safe to directly use this source for Vss of >> > > L298? >> > >> > As long as you adhere to the above. You are supplying that power >> > externally, so make sure you have the current. >> > >> > >> > >> > > I will use PWM signal connected to L298's Enable pins, so the driver >> > > should not be enabled without generating the PWM signal. >> > >> > Good. >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > > On 9 Aralık, 02:58, Gerald Coley <ger...@beagleboard.org> wrote: >> > > > Yes, it is possible. The L298 is an old but reliable device. >> > > > -You will need to level shift the 3.3V PWM and GPIO signals to 5V. >> > > > -Make sure you add your protection diodes. >> > > > -I suggest that you run it from the VDD_5V rail. >> > > > -Make sure on power up that the driver is disabled >> > >> > > > Gerald >> > >> > > > On Thu, Dec 8, 2011 at 4:35 PM, Emre YAZICI <d...@yazici.info> >> wrote: >> > > > > Hello, >> > >> > > > > I want to drive two DC motors with L298 using BeagleBoard-xM (Rev >> C). >> > > > > Is it possible to use GPIO and PWM outputs (for speed control) of >> > > > > BeagleBoard for that purpose? If yes, is there anything that I >> should >> > > > > care and do I need to any extra circuit elements? >> > >> > > > > Thanks, >> > > > > E. 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