[Ovmsdev] OVMS - HW

Olav A. Antonsen olav at ansit.no
Tue Jun 17 05:09:04 HKT 2014

I got some help from a user on a Norwegian forum who pointed me to 


 <https://raw.githubusercontent.com/openvehicles/Open-Vehicle-Monitoring-System/master/vehicle/Car%20Module/v2-base/OVMS_V6A.pdf> https://raw.githubusercontent.com/openvehicles/Open-Vehicle-Monitoring-System/master/vehicle/Car%20Module/v2-base/OVMS_V6A.pdf


Looks like a 7805-regulator is supplying the OVMS module with +5V @ 1.5A max.




80mA won't be a problem then.




Fra: ovmsdev-bounces at lists.teslaclub.hk [mailto:ovmsdev-bounces at lists.teslaclub.hk] På vegne av Mastro Gippo
Sendt: 16. juni 2014 23:03
Til: OVMS Developers
Emne: Re: [Ovmsdev] OVMS - HW


It may be a problem to get the 5V from the output of the regulator, but the nice thing about that module is that it is isolated; you can connect your own power supply and be 100% safe. These relays draw about 80mA each (just tested them, I have the same product at home), so if you turn them on one at a time and for short periods of time it should be ok (I don't know a lot about the termal design of the OVMS).



2014-06-16 22:37 GMT+02:00 Olav A. Antonsen <olav at ansit.no>:



My knowledge of electronics is limited.


As far as I understand the OVMS module is supplied with +12V via the OBD connector. What I don't understand is where the +5V comes from? 




I'm currently trying to control a relay using the RC3 output on the PIC18F2580 as a control signal to a rely on a relay module




The relay module needs to be supplied with +5V to drive the relays, and my plan was to get the +5V from the OVMS module using pin 13 on the HEADER 9X2.


But I'm afraid I might blow something on the OVMS module if the relay module draws to many mA.


Any advice would be appreciated.




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