Hi, Sorry to bother again with this topic, but I only wanted to ask if the new CE certified 3.2 module could make a difference here as I read it has some new filters on it? Regards Martin Mit Hilfe von kathalytischen Konvertern gesendet.
Am 24.06.2019 um 10:10 schrieb Martin Hofgesang <martin.hofgesang@gmx.de>:
Hello all,
When my OVMS-module is connected to my car and I am only doing some tracing of CAN-ids [1] I have trouble with hearing radio from radio station using DAB+.
The radio frequently interrupts shortly when listening to such a radio station. When OVMS is disconnected everything is fine and I can listen to the radio without interrupts.
I have to say, I did not mount my OVMS, so it lays on the floor or underneath the seat in my car, including the GPS- and GSM-antenna, I hope it will be better, when I mount the Antennas outside underneath the front trunk of my car (which has, luckily, a cover made from plastik).
Did anyone have also problems with digital radio stations?
Regards
Martin
[1] for example the command "can log crtd /sd/log/speed.txt 1:5d7" _______________________________________________ OvmsDev mailing list OvmsDev@lists.openvehicles.com http://lists.openvehicles.com/mailman/listinfo/ovmsdev
There has been no change on the radio side (which is the most likely thing causing your interference). The testing we did on the 3.1 modules was pretty close to passing as it was. Just at a couple of frequency points it edged very slightly over the permitted values. Really just a few percent. Annoying as hell. The filters we added are on the power side. Primarily intended to stop the module interfering with other devices on the same power line. We could have gotten the same benefit by adding magnetic ferrite rings to the vehicle cables (but adding them to the board is more convenient). I guess there could be some EMI style interference improvement, but it wasn’t measurable. The lab didn’t ask us to make any changes on the EMI front. Regards, Mark.
On 28 Jun 2019, at 1:36 PM, Martin Hofgesang <martin.hofgesang@gmx.de> wrote:
Hi,
Sorry to bother again with this topic, but I only wanted to ask if the new CE certified 3.2 module could make a difference here as I read it has some new filters on it?
Regards
Martin
Mit Hilfe von kathalytischen Konvertern gesendet.
Am 24.06.2019 um 10:10 schrieb Martin Hofgesang <martin.hofgesang@gmx.de <mailto:martin.hofgesang@gmx.de>>:
Hello all,
When my OVMS-module is connected to my car and I am only doing some tracing of CAN-ids [1] I have trouble with hearing radio from radio station using DAB+.
The radio frequently interrupts shortly when listening to such a radio station. When OVMS is disconnected everything is fine and I can listen to the radio without interrupts.
I have to say, I did not mount my OVMS, so it lays on the floor or underneath the seat in my car, including the GPS- and GSM-antenna, I hope it will be better, when I mount the Antennas outside underneath the front trunk of my car (which has, luckily, a cover made from plastik).
Did anyone have also problems with digital radio stations?
Regards
Martin
[1] for example the command "can log crtd /sd/log/speed.txt 1:5d7" _______________________________________________ OvmsDev mailing list OvmsDev@lists.openvehicles.com <mailto:OvmsDev@lists.openvehicles.com> http://lists.openvehicles.com/mailman/listinfo/ovmsdev <http://lists.openvehicles.com/mailman/listinfo/ovmsdev>
OvmsDev mailing list OvmsDev@lists.openvehicles.com http://lists.openvehicles.com/mailman/listinfo/ovmsdev
There aren't very many interesting can pids on the high speed (2-wire) can bus in my Cadillac. For example if I capture frames while using a tech2 to look at tpms data, nothing looks like tpms data. Since the tech2 has both 1 and 2 wire can interfaces I want to start looking at the low speed single wire bus. (Maybe it's just that a "little battery" car first sold in 2008 does things on the low speed bus that newer EVs do on a/the high-speed bus?) My assumption is that the MCP2515 doesn't care about the physical layer as long as the speed is set correctly so my initial thought was to just back a 2-wire transceiver chip up to a single wire one, e.g. the MCP2515 and MC33897. But a friend pointed me at a block post where this guy is using a 2-wire sparcfun shield to snoop a single wire bus: https://blog.mikejmcguire.com/2017/02/20/eavesdropping-on-the-single-wire-ca... He basically just ties can L to ground and can H to the bus. I also found a copy of the can single wire spec (J2411-2000) and it seems 2-wire is 2V differential and single wire is 0-4V so I guess I see how this might possibly work (depending on how the bus i/o pins are designed). Anyway, is it safe for me to do this with one of the SN65HVD233D transceivers used in the ovms V3 module? Craig
participants (3)
-
Craig Leres -
Mark Webb-Johnson -
Martin Hofgesang