开云体育

1. I am have redone the schematic with the leve shifters. at this point, 2. we are not going to have a general purpose 'experimenters area' so, if there is more circuitry coming in, we either put it

I’d suggested a larger pcb… room for the circuits we haven’t realized we need at this time. Very little cost increase at most fabs I’ve used. Then again, time pressure! The MOSFET in the level

It looks like the 20x4 as well as the TFT 2.8 inch SPI displays are not going to be as available as the 16x2 displays. the 16x2 and the 24x4 have the same pin outs but the 20x4 is much larger and we

the board will have to be redone for the level shifters. there isn't enough space on this on the current layout. Let's move the close-by date to monday to get this done. We won't be able to close this

Bob's design included a 0 ohm resistor to bypass the level shifters. If the level shifters are not obtainable in India I understand the tradeoff greatly goes for getting something out there to start

Hi Bob, I think both of our arguments are correct. However your argument showing the the 1 voltage level is out of spec is a more compelling yes or no argument than mine with more technical details to

If the I2C pulls are a must, then we will have to wait for someone to either make a PCB and try it out or for me to get these unobtainable FETs here which may take weeks. In either case, the Indian

Hi guys, I think I may see where we are missing each other. Ashhar says in an earlier post: Tom, I don't have the components to test this out. The noise levels on the line will not change regardless

Yes the noise level will not change, but the susceptibility to the noise will be decreased by a improved margin. The voltage range of the 0 and 1 levels on the 3.3 v side is increased on the 5 v side

This is my concern using an I2C pull-up to 3.3V using a 5V processor: From the Atmel ATmega328P datasheet... section 2.8, page 264. Vin High Min spec attached to this message as an image, full data

Tom, I don't have the components to test this out. The noise levels on the line will not change regardless of the external level shifters. The 0.8v is zero and 1.8v and higher is one. The risk of 0.08

Kicad is available for Linux, MacOS, and Windows. https://www.kicad-pcb.org/ Arv _-_

Hi Ashhar, With the 2.2 k pull-ups it likely is not even necessary to disable the 47k pull-ups, as the 47k resistors will only rase the high voltage by 0.08 volts. However, when the Nano sees a high

Thanks!

My schematic modifications to an earlier rev of Ashhar's design:? osvent_ControllerRCL.pdf This design includes at the schematic level: I2C level translation, 10-pin connector with additional i/o

Bob and gang, I am attaching a hand drawn sketch. It explains how the pull ups work on Arduino. 1. The pull ups are not hardwired. They are under software control. There is an FET switch that is

Bob, I am up and running. I will mail separately on the I2C shifter. We also have to bring out a6 and a7. Ship this baby today. 73, f.

Hi folks, For schematic entry and board layout: All else being equal, please consider using the current revision of KiCad. Version 5.1.5 is current. Ashhar and I have been using this toolset. If you

hi folks -- Ashar Farhan has a completed board design undergoing critique by several and Bob, WO6W may have one also (I don't have the softwre to understand what he has done). If YOU are creating a

Bob WO6W: I'm trying to review the PCB design you have made, but I don't have KICAD and I cannot find a pdf or jpg of the printed circuit board anwhere in the files that you ahve uploaded.? ?Perhaps