The DS18B20 is the 1-wire sensor I'm using. I knew that when I initially connected it, but have not bothered to remember that after looking at the datasheet . . .too much else going on right now. They're really easy to read from using C, and C++( one or the other ), and probably any other language you'd care to use. Doing something similar in C++ I think I did in less than 75 lines of code, using no special libraries:
root@beaglebone:~# cat /sys/bus/w1/devices/28-*/w1_slave f2 00 4b 46 7f ff 0e 10 f8 : crc=f8 YES f2 00 4b 46 7f ff 0e 10 f8 t=15125 On Thu, Jan 26, 2017 at 11:19 PM, William Hermans <[email protected]> wrote: > HI Drew, > > I have not used a thermocouple on the beaglebone it's self. I have however > used a SPI interface MAX31855, and they ramp up fairly quickly, and are > reasonably accurate. We used this for a convection oven to reflow oven > conversion. In testing, it seemed to work really well, but we never > actually used that oven to flow boards. Instead we decided to change to an > IR oven. > > As far as placement, I think you would want to place the cable end > directly onto the processor die, with a bit of heat sink grease between > both. > > Another option would be to use a 1-wire temperature sensor. I have one > here connected to a beaglebone at this moment, but I could not tell you > offhand what the part number is . . . > So it's my understanding that these 1wire sensors in not as accurate as a > thermocouple. However I think I could work well enough. As far as placement > of these . . . well I'm not sure about that. A datasheet would need to be > referenced. But perhaps directly on the processor it's self as well with a > bit of thermo grease between the two ? Not sure. They're a similar package > to a small transistor. Additionally, these are rather slow in response. I > think the best 1-wire query "speed" is 750ms between reads. But I think if > you need to read temperatures faster than this for this particular > application . .something else is "wrong" ;) > > > -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORqKo2HFs1J42UABOOnqwjcnA2dL9g5dj3zM-W0NfR_okg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
