If you contact MaxBotix or check the specs on the Pololu page http://www.pololu.com/product/723/ you can see it has the following outputs
- Three interfaces (all are active simultaneously): - Serial output: asynchronous, logic-level, *inverted*, 9600 bps 8N1 - Analog output: (Vcc/512) / inch (10 mV/inch when input voltage Vcc = 5 V) - Pulse width output: 147 μs/inch On Tue, Nov 5, 2013 at 9:37 AM, Mike Bremford <m...@bfo.com> wrote: > At risk of asking the obvious, have you double checked you're putting out > serial data? Your datasheet requires the BW pin to be floating or low to > output out serial data, otherwise it puts out pulse data on the same pin. > > Before you try the inverter approach, maybe just put a multimeter on the > Tx pin on the device - it should be high (ie 3.3V) most of the time. If > it's transmitting once per second, NMEA0183-style, even then the voltage > should be closer to 3.3V than GND. If it's closer to GND, then you'll need > to invert it. > > I'm working with a whole stack of NMEA0183 devices and assuming they're > properly functioning, the only thing you can really get wrong are baud > rate, inverted signal, wrong pin (tx instead of rx, in which case you hear > nothing) or software config error. For software, I just use screen - > "screen /dev/ttyO2 9600" - rather than minicom or any of the other scripts. > Much easier. > > > On 5 November 2013 09:52, Gustavo Oliveira <gustavo.pinho...@gmail.com>wrote: > >> I guess I did some mistake answering back there =P >> It is in UART_RX. >> >> I search the internet and found that maybe I'm getting the inverted >> messages, all the 1s as 0s and the 0s as 1s. >> >> >> On 5 November 2013 09:50, Gustavo Oliveira <gustavo.pinho...@gmail.com>wrote: >> >>> 1) I'm using the 3.3V pin, so the voltage is acceptable in p9_22. >>> >>> 2) What do you mean by setttings, the fields when I export the pin? Or >>> the pin mode? I think mine are ok, what should they be? >>> >>> 3) I tried many applications, python scripts, c scripts, minicom... >>> >>> >>> On 5 November 2013 05:26, Maxim Podbereznyy <lisar...@gmail.com> wrote: >>> >>>> 1) I would place a voltage translator or a simple voltage divider based >>>> on two resistors to reduce 5 volts to the acceptable 3.3V. >>>> >>>> 2) check the pinmux settings for that pin >>>> >>>> 3) what terminal application do you use to read data? Check the serial >>>> port parameters and don't forget to disable the hardware flow control if >>>> any >>>> 05 нояб. 2013 г. 3:55 пользователь "Gustavo Oliveira" < >>>> gustavo.pinho...@gmail.com> написал: >>>> >>>>> Hi, thank you for quick reply, >>>>> I'm using a BeagleBone and Ubuntu 12.04. >>>>> >>>>> I have the TX connected to p9_22, which is uart2 RX. >>>>> >>>>> On Monday, November 4, 2013 7:38:06 PM UTC, lisarden wrote: >>>>>> >>>>>> hi! >>>>>> >>>>>> what board do you use and what OS? >>>>>> >>>>>> your datasheet says that VCC is +5V and the TX pin also work in 0-VCC >>>>>> range. If you use beaglebone it accepts only 3.3V, however there can be >>>>>> options >>>>>> >>>>>> >>>>>> 2013/11/4 Gustavo Oliveira <gustavo....@gmail.com> >>>>>> >>>>>>> Hello, >>>>>>> I'm trying to read from a LV-Maxsonar-EZ0 using the serial interface. >>>>>>> >>>>>>> I have connected the wires correctly and I have placed an overlay in >>>>>>> uart2. >>>>>>> The problem is the data I'm reading from the sensor. I can only get >>>>>>> garbage, but its not completely wrong because the data changes >>>>>>> according to >>>>>>> the distance to obstacle. >>>>>>> >>>>>>> The datasheet for the sensor can be found here: >>>>>>> datasheet<http://www.maxbotix.com/documents/MB1000_Datasheet.pdf> >>>>>>> . >>>>>>> >>>>>>> I searched google for a day and couldn't find anything... >>>>>>> Someone posted in a raspberry pi forum that the problem is the >>>>>>> meaning of 1s and 0s, but I changed active_low to 1 and I got the same. >>>>>>> >>>>>>> I'm not very proficient with electronics, so I might take some time >>>>>>> following instructions. >>>>>>> Nonetheless all the help will be welcome. >>>>>>> >>>>>>> -- >>>>>>> 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 beagleboard...@googlegroups.com. >>>>>>> For more options, visit https://groups.google.com/groups/opt_out. >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> LinkedIn - http://www.linkedin.com/in/maximpodbereznyy >>>>>> Company - http://www.linkedin.com/company/mentorel >>>>>> Facebook - https://www.facebook.com/mentorel.company >>>>>> >>>>> -- >>>>> 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 beagleboard+unsubscr...@googlegroups.com. >>>>> >>>>> For more options, visit https://groups.google.com/groups/opt_out. >>>>> >>>> -- >>>> For more options, visit http://beagleboard.org/discuss >>>> --- >>>> You received this message because you are subscribed to a topic in the >>>> Google Groups "BeagleBoard" group. >>>> To unsubscribe from this topic, visit >>>> https://groups.google.com/d/topic/beagleboard/gOK8R4_mRzw/unsubscribe. >>>> To unsubscribe from this group and all its topics, send an email to >>>> beagleboard+unsubscr...@googlegroups.com. >>>> For more options, visit https://groups.google.com/groups/opt_out. >>>> >>> >>> >> -- >> 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 beagleboard+unsubscr...@googlegroups.com. >> >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/gOK8R4_mRzw/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > beagleboard+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.