I am going to attempt to attach an old wiimote camera to the arduino pro micro 5v. I have been given a diagram that is known to work. I would like to attach the camera via a bi-directional logic level shifter 5v to 3.3v (SKU: CE07510). My question is, do I still need to solder the (pull up) resistors shown in the attached diagram (I have circled them in blue in the first attached diagram). The second diagram is showing my proposed idea.
The resistors on the logic level converter have some level of pullups kind of baked into them already!
It might be worth giving them a test both with and without - the only real thing you are fighting is the spec for the rise time; that’s no worries here though! (if the rise time is a bit slow you won’t break anything)
Here’s a clip from Colin’s Lab notes - awesome short clips about electronics!
EDIT: Neon lights they were aha, not sure how I missed that either!
Sparkfun have a great guide on getting it connected and some super interesting reading on how they work:
Hi Andrew
I don’t know much about what you are trying to do with the camera.
BUT surely most of the connections on that logic level converter are all wrong. The only correct ones would be Ground and the yellow one whatever that is, bit hard to read.
HV connects to 5V source
LV connects to 3.3V source
These provide the 5V and 3,.3V supply for the outgoing signals.
HV 1, 2, 3 and 4 are connections for logic signals on the 5V side while LV 1, 2, 3 and 4 are ditto on the 3.3V side.
You seem to have 5VDC going in to HV3 and expect it to be 3.3VDC out at LV3. That is not going to happen. The 5V and 3.3V have to be provided at HV and LV externally.
Liam I don’t know how you did not pick up on this.
Cheers Bob
Thank you for explaining that. I know it might be very obvious to people experienced with electronics, but I am an amateur, hence the reason I sought advice on this forum. I misread the description of bi-directional logic, I actually thought it converted the 5v to 3.3v.
No, not in the true sense. To do that there are dedicated 5V to 3.3V POWER converters. That is they will not only convert the voltage but will supply useful current or power as well.