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Hi, I have a problem with an I2C bus. For whatever reason, it will not start as it lays on the PCB. However, touching the SDA line with a scope probe kick-starts it, and from that point, it runs as expected even with the probe removed. If the scope probe is physically connected to SDA on system...

Hi Im looking at a project drive for electronic throttle control (drive by wire). The throttle body, which contains a geared servo and feedback pots, is spring loaded- such that a power failure to the servo will allow the spring to back drive the motor, to close the throttle plate. It seems...

Hi- I have a data logging application which will see 0-15V on some high impedance sources. There will be 12 or more inputs needed- and I have 20+ ADC channels on the microcontroller that will handle the sampling; 12 bit, but that is adequate for my application. To minimize load on the sensor...

Hello I have an application where I will need to employ 8-10 low-side mosfets for simple DC power switching- replacing some conventional mechanical switches in an automotive environment. The expected current is 20A at 12V max. Id like to know if anyone has any practical experience with...

Hi I saw a chassis (on the site linked)- and was curious about how this diagonal slot pattern would be done in SW. Clearly one method is just the brute force approach, setting up start and end points with the Pattern tool and manually creating/copying sketches. This would allow for the varying...

Hello I have a need to implement a pre-voltageregulator capacitor for an automotive computer. I need to address ESD not only on the sensor inputs (already implemented), but also on the main power input. Having done some modeling, and consulting with ESD specialists, it appears that 1ns-duration...

Hello all- happy New Year. I have an application where I need to mount a daughterboard in parallel with a baseboard, with a separation of approx 10mm. This connection will handle power and signaling- 1A per pin max- between the boards. Pin count is < 20. I have read an excellent book on...

Hello I have an application which will involve 2 microcontrollers and an SPI-based accelerometer. The Primary controller is heavily tasked, and therefore requires the support of a Secondary controller to handle integrations from the accelerometer data. All devices have a single SPI module. Im...

Hello- Im converting an MCU<->MCU interface from I2C to SPI. Problem is, the MCUs are on different PCBs- where one is on a daughter card connected via standard IDC Header/socket. The trace length is minimal- 6" or so. But, I have no experience with routing high-speed signal lines; the I2C...

Hello I have an application that involves several microcontrollers and a number of peripherals on the same PCB. The MCUs leverage I2C to communicate with each other and with the peripherals (real time clocks, flash/EEprom, etc). Normally, one would use a CPU supervisor chip to just hold the MCU...

Hello I was attempting to model a split mould for a 3d wing- which is, a 2d profile swept on a 3d spline. Simple variant of this would be a drooping wing on a glider. OK, so for the most part it seems split moulds are defined by building the 3d model, and the billet, then subtracting out the...

Hi Sorry if this has been previously addressed- search terms are not always appropriate. I have an application where I have several power Mosfets (IRL1104) which are capable of 100A. I think the leads would melt at 40, but that is the spec. OK, so the question for the experts is- how does one...

Hey all Sorry if this has been beaten to death, but I didnt see anything in my search on USB->PC oscilliscopes. Most of my work is automotive, but sometimes I need to be able to tap in to verify phasing on stepper motors, or to look at a CAN bus, etc. Im looking for a relatively inexpensive and...

Hi I am building a model in preparation for meshing. The model is an auto chassis and 2 wheels (symmetry plane based). For whatever reason, when I build a solid tunnel around the chassis/wheels (wind tunnel model), and execute a 'create, body operation, cut material, generate', I get an error...

Hi all Im doing some automotive aerodynamics work, and am using SW to generate my solid models. I have a base chassis (a solid) created. I opted to design this plug as a form without wheel wells, so that I could add fender flares of various profiles later. My expectation was that I would use an...

Hi I am experimenting with aerodynamic aids for a vehicle. I have found it difficult to isloate lift/downforce components by object, since the objects already include an atmospheric force component. What I was hoping to do was to run the same mesh with two different inlet conditions (i.e. near...

I have two question re: Symmetry plane usage in CFX. 1. When running function calculations on a result set (ie drag on a car body), does the result reflect the entire body, or just the half contained in mesh? I have not been able to find consistent answers on this. 2. When displaying graphical...

I use Solidworks primarily to design 3d solid models for later use with fluid dynamics tools (aerodynamics). I am working on an auto project (80's Porsche 911), and wanted to import an established model from 3D Studio or Lightwave, since there are many models available of this car in those...

Hi all- I use Solidworks primarily to design 3d solid models for later use with fluid dynamics tools (aerodynamics). I am working on an auto project (80's Porsche 911), and wanted to import an established model from 3D Studio or Lightwave, since there are many models available of this car in...

Hi Im fairly new to Solidworks. Im having trouble finding a method to create a single solid 3d body that might contain various tabs (for example) for stress analysis. Target object might be something like a beach chair, where I want to determine stress on legs. Normally, I would create the...