splitting the 5v on megasquirt

[kongo]

Does anyone know how many times I can split the 5v signal from megasuirt? I triing to send power for the tps/crank sensor and the fuel gauge( hopefully Im reading this right).

 

[OEM]

If your trying to send power to those sensors you can use a 12v to 5v converter from radioshck part# 276-1770 model#7805 cost is $1.59.

 

[VelocitàPaola]

Does anyone know how many times I can split the 5v signal from megasuirt? I triing to send power for the tps/crank sensor and the fuel gauge( hopefully Im reading this right).

Most sensors don't draw very much power. You can use the +5V TPS Vref wire for at least the TPS, crankshaft angle sensor, camshaft position sensor (if used), and vehicle speed sensor. I wouldn't connect it to much else, because if there's enough current draw, you will compromise the accuracy of the voltage reference. I also wouldn't connect it to the fuel gauge assembly, that should have its own power source independent of the stock PCM and your Megasquirt ECU.

 

[VelocitàPaola]

If your trying to send power to those sensors you can use a 12v to 5v converter from radioshck part# 276-1770 model#7805 cost is $1.59.

The LM7805's work well, but they need to be properly filtered in order to create a clean voltage reference signal. The voltage regulator inside Megasquirt ECU's is a low dropout (LDO) voltage version of the LM7805, but they also employ about half a dozen capacitors, a few inductors and MOV's to protect against voltage and current transients. Any abnormalities in the voltage reference will manifest themselves as skewed readings from your sensors. Besides, the voltage regulator inside the ECU is sufficient for powering most every sensor.

 

[kongo]

thanks. The reason I said fuel gauge because theirs an out put from the pcm to fuel guage. page 8-179