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'''Noisy TPS if bluetooth is not supplied from the recommended "wired-in" dedicated 5V supply''' and no additional regulator (or added cap is used). http://www.vemssupport.com/forum/index.php/topic,2954.0.html Topic for discussion. In 2016 I experienced noisy 5V supply on Genboard V3.8 , usually when Vems bluetooth adapter is powered from EC36/28. I have not been alone. So one more confirmation that powering BT from EC36/28 (which is primarily for HALL and MAP sensors) is not a good idea, and '''there is a good reason for the "wired in" option''' (which is a dedicated powerful supply) '''for the bluetooth module'''. * Doctor, it hurts if I do this... ** don't do that than :-) http://www.vemssupport.com/forum/index.php/topic,2500.0.html http://www.vemssupport.com/forum/index.php/topic,2435.0.html The bluetooth adapter appears to generate noise on MAP and TPS. In our application TPS DOT rate settings caused acceleration enrichments to be active ALL the time, while little added, it held off EGO and VemsTune and VemsDisplay gauges would flutter significantly...... No good. Adjusting TPS DOT rate settings caused hesitation. Removing the bluetooth adapter, Resolved the issue. External power supply of the Vems bluetooth adapter resolved the issue............ Vems bluetooth adapter creates noise on 5v supply when powered from EC36/28. Today while looking at the schematics for another modification, I noticed that C69 (220n) capacitor on 5v feeding EC36/29 is not present on the board. Pin 29 is powered from Pin 28 via R142 and ground through C69. Forgetting for a moment my basic knowledge of electronics, would installing this capacitor help reduce the noise generated by the Vems bluetooth adapter on EC36/28?............ perhaps a little, likely not fully. A '''10..22uF cap closer to the BT DSUB9 might help though'''. Options: * powering from separate [https://shop.vems.hu/catalog/regulator-p-189.html regulator] (this fits in a small heatshrink, if someone does not like the size of the big overmoulded 3A 5V supply) * perhaps adding more cap, eg. 10uF (fast ceramic eg. 1206; or 1uF ceramic and 22..47uF electrolitic in parallel) on EC36/28 helps (because bluetooth supply current spikes are sharper than any HALL or MAP sensor supply current). '''Does a 22uF between DSUB9 pin5 and pin9 (either side of the DSUB9) fully solve the noisy TPS''' ? ** (or using +5V from LCD connector or header or PS2 so close to endplate that unclamping of ECU not needed to access it, no full disassembly=minimal time and risk). In any case, the proper way is to use a separate regulator independent of HALL, MAP, TPS (or other essential engine control) * possible '''order comment when ordering VEMS ECU: "RS232 on DSUB9-female with +5V on pin9" (free of charge)'''. ---- Return to MembersPage/Sprocket
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