Question Questions Thread for WMU V2 (BitBuilt 2024 Summer Build Competition Entry)
- Thread starter Lemoncake
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A stock Wii accepts up to 18.something volts IIRC, but that input voltage goes through the CM3 regulator first to ensure that a perfectly flat 12v is supplied to the other regs (which are apparently very sensitive), sensor bar port, and pre-amp. If a higher voltage is supplied to the sensor bar port, you're risking accelerated burnout of the LEDs if you don't adjust the sensor bar's inline current limiting resistor. I'm not sure if the pre-amp would be at risk of damage or not, you'd have to check the part number and/or ask Shank.
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(Already made a separate thread for this, but figured it should go here too. Sorry for the double post 
)
Hey guys, so quick question: I just wired up the Electron Shepherd AnalogHDMI to my trimmed Wii, and I’m getting the strangest result. I haven’t powered anything on yet, but when I checked between 3.3v and 5v, it read it as shorted. However, this only happened when the HDMI cable was plugged in. When it isn’t plugged in and the Analog HDMI is just sitting there wired up, there are no shorts. In addition to that, none of the pads on the AnalogHDMI are shorted to anything. Everything boots up fine with it wired up and no HDMI in. Has anyone ever had an issue like this before or is it completely normal behavior (I really don’t want to cook my Wii in the home stretch of this project)?
)Hey guys, so quick question: I just wired up the Electron Shepherd AnalogHDMI to my trimmed Wii, and I’m getting the strangest result. I haven’t powered anything on yet, but when I checked between 3.3v and 5v, it read it as shorted. However, this only happened when the HDMI cable was plugged in. When it isn’t plugged in and the Analog HDMI is just sitting there wired up, there are no shorts. In addition to that, none of the pads on the AnalogHDMI are shorted to anything. Everything boots up fine with it wired up and no HDMI in. Has anyone ever had an issue like this before or is it completely normal behavior (I really don’t want to cook my Wii in the home stretch of this project)?
Shorted as in 0 ohms? That's very strange, can't say I've heard of that happening with a AnalogHDMI before
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Yep. Zero ohms. Think it’s a faulty product or should I be alright to test it on the Wii?
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My mistake, it isn’t the Analog2HDMI, it’s the new version: the ElectronAnalog. Just for reference, I have is set to output Y Pb Pr and analog audio. Also, I messed around with the connection, and it’s actually alternating between 2 shorts: 5v and 3.3v, and 5v and GND. But for some reason only on the board itself. No where else is 5v shorted to GND. That doesn’t apply to 5v and 3.3v. It’s everywhere.
Do you have an insulating layer between the board and the top of the Wii's AV port? Are the two close enough that contact could occur?
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Hey, just stumbled across this random factoid and had a question about it. On a Wii’s AV port, the Sensor bar has it’s own 12v and GND pins (on the Wii trimming guide they are labeled Sensor 12v and Sensor GND). Curiously, that Sensor GND is not connected to the other GMD pads. Does anyone know why this is the case and do I need to hook up my custom rewired sensor bar port to this specific GND plane or can I do it at any GND plane?
The sensor bar GND is PWM'd (pulsed on and off) to limit the current through the LEDs (this is called low-side switching).
Early sensor bars have more LEDs (5 per side) and need the ~7V or so that the motherboard's circuit provides. Later sensor bars only have 3 LEDs per side and can run from 5V and GND directly. To maintain compatibility with all sensor bars, it's best to keep the original circuit and provide 12V to the sensor bar port on the mobo.
Early sensor bars have more LEDs (5 per side) and need the ~7V or so that the motherboard's circuit provides. Later sensor bars only have 3 LEDs per side and can run from 5V and GND directly. To maintain compatibility with all sensor bars, it's best to keep the original circuit and provide 12V to the sensor bar port on the mobo.
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Cool! So just hook up my 12v line to the Sensor 12v pin on the mobo then connect that to my sensor bar port then connect it’s GND line to the Sensor GND on the mobo?
Yup, that should work!