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VEMS Community Forum

General Category => General Discussion => Topic started by: gunni on July 18, 2015, 10:46:56 PM

Title: Bluetooth module
Post by: gunni on July 18, 2015, 10:46:56 PM
This https://shop.vems.hu/catalog/bluetooth-rs232-adapter-p-179.html?osCsid=9eeb514419996d28ef96bc008ad11959

Can this be updated to include a capacitor that keeps it alive during cranking conditions?

Title: Re: Bluetooth module
Post by: mads b (dk) on July 19, 2015, 09:32:58 AM
What is your power source?
Title: Re: Bluetooth module
Post by: gunni on July 19, 2015, 11:00:39 AM
It would be the same 12v as the ECU, this very often drops upon startup.
Title: Re: Bluetooth module
Post by: mads b (dk) on July 19, 2015, 11:47:16 AM
Ok a 12->5volt power supply connected to the same power source as ecu and switch by ignition key ?
Title: Re: Bluetooth module
Post by: gunni on July 19, 2015, 04:36:58 PM
yes, the ecu might well turn off, but the bluetooth takes quite a while to come back on, so a capacitor that can hold it for maybe 1-2sec
Title: Re: Bluetooth module
Post by: mads b (dk) on July 22, 2015, 08:16:58 AM
If you measure the current draw on the 5volt side, then it should be possible to calculate the size needed for 2-3 sec backup power
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