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IoT Router

 by dschlic1 ¦  Wed Jul 18, 2018 10:05 am ¦  Forum: Projects ¦  Topic: IoT Router ¦  Replies: 0 ¦  Views: 424

I now have 6 IoT devices on my home network. This network is fed from the FIOS ISP router which probably has not been updated in years. So I am looking into purchasing a new router. I want some level of protection for the IoT devices, most of which will not get updated. In doing some research there ...

Re: Which PCB layout software should I use?

 by dschlic1 ¦  Wed Jan 10, 2018 12:29 pm ¦  Forum: PCB Design Questions ¦  Topic: Which PCB layout software should I use? ¦  Replies: 6 ¦  Views: 1194

If you are running Linux, there is an excellent program called "PCB". There is also a design suite called gEDA.

Re: RS232 Shifter - does it drive negative voltage?

 by dschlic1 ¦  Fri Sep 29, 2017 10:21 am ¦  Forum: SparkFun Product Questions ¦  Topic: RS232 Shifter - does it drive negative voltage? ¦  Replies: 2 ¦  Views: 327

Just looked at the schematic, and no it will not.

Re: PH Meter

 by dschlic1 ¦  Fri Apr 07, 2017 11:01 am ¦  Forum: SparkFun Product Questions ¦  Topic: PH Meter ¦  Replies: 2 ¦  Views: 522

pH is only defined in water.

Re: Alternative connector to RJ45 Jack for Ethernet

 by dschlic1 ¦  Mon May 16, 2016 10:32 am ¦  Forum: Projects ¦  Topic: Alternative connector to RJ45 Jack for Ethernet ¦  Replies: 4 ¦  Views: 1126

You have to be careful here. There needs to be a magnetic transformer between the cable and the actual Ethernet IC. In some cases this transformer is located in the jack. You can get separately mounted transformers.

Re: ADC internal resistance

 by dschlic1 ¦  Wed Dec 23, 2015 9:56 am ¦  Forum: Everything ARM and LPC ¦  Topic: ADC internal resistance ¦  Replies: 2 ¦  Views: 1689

Most ADCs have a dynamic input impedance: They charge a capacitor in a sample and hold function. Better place an op-amp buffer between the divider and the ADC input.

Re: Measuring low frequency vibrations

 by dschlic1 ¦  Wed Jul 08, 2015 10:33 am ¦  Forum: Projects ¦  Topic: Measuring low frequency vibrations ¦  Replies: 4 ¦  Views: 457

Please note that for most humans hearing goes down to at least 10 to 20 Hz. 60 Hz is the hum you hear (at least in the US) from some electrical equipment. Also while most microphone specs show a lower limit at 100 Hz they have usable repeatable response much lower with a loss of accuracy but not rep...

Re: Problem with cheap (HC-SR04) Ultrasonic Rangefinders

 by dschlic1 ¦  Mon Jun 29, 2015 10:24 am ¦  Forum: Projects ¦  Topic: Problem with cheap (HC-SR04) Ultrasonic Rangefinders ¦  Replies: 9 ¦  Views: 5115

A potential workaround to this issue is in your "master" processor if the echo remains high after a certain period of time, assume loss of echo. Trigger the unit again after that and continue on. When an object comes into range the echo output will go low and you know that you have a return echo.

Re: A newbies attempt to control a bunch of peristaltic pump

 by dschlic1 ¦  Fri May 15, 2015 11:41 am ¦  Forum: PCB Design Questions ¦  Topic: A newbies attempt to control a bunch of peristaltic pumps ¦  Replies: 2 ¦  Views: 1426

You might look at the following for the RaspberryPi:
https://www.sparkfun.com/products/11561

No need for a custom board, just add four of them and you have your drivers.

Re: IDE for STM32

 by dschlic1 ¦  Wed Feb 25, 2015 11:39 am ¦  Forum: Everything ARM and LPC ¦  Topic: IDE for STM32 ¦  Replies: 4 ¦  Views: 2591

I have used the free version of Atollic TrueStudio. I also used FreeRTOS in TrueStudio. I don't know how well the latest versions work.

Re: Zener divider network

 by dschlic1 ¦  Tue Aug 26, 2014 10:07 am ¦  Forum: Projects ¦  Topic: Zener divider network ¦  Replies: 18 ¦  Views: 2171

I would look at using some kind of series pass regulator (IC) to drop the battery voltage down to 6 or seven volts for the ProMicro. As for the ADV vref, you want the most accurate, stable voltage you can get. I would use a reference voltage source for that. All told it would increase the cost sligh...

Re: How to Simulate Differential Pressure Sensor?

 by dschlic1 ¦  Thu Aug 21, 2014 11:13 am ¦  Forum: Projects ¦  Topic: How to Simulate Differential Pressure Sensor? ¦  Replies: 23 ¦  Views: 3072

One method is to use two pressure sensors, one on each side. However you can run inot resolution/accuracy issues if the common mode pressure is very high and the pressure difference is very small. Also will need two ADC point for each DPIT.

Re: UV Sensor Project

 by dschlic1 ¦  Thu Aug 21, 2014 11:08 am ¦  Forum: Projects ¦  Topic: UV Sensor Project ¦  Replies: 4 ¦  Views: 495

Have you added the decoupling capacitors as called for in the data sheet? Also what range of output voltage are you working with? If the range is limited (spec sheet calls for 1 to 3 volts) perhaps some signal conditioning to change the range to cover more of what your ADC uses. Another way to incre...

Re: Direct Burial speaker wire suitable for 12V 5A power?

 by dschlic1 ¦  Wed Aug 20, 2014 12:00 pm ¦  Forum: Projects ¦  Topic: Direct Burial speaker wire suitable for 12V 5A power? ¦  Replies: 5 ¦  Views: 1013

Three conductor romex actually has four conductors.

Re: if there's one thing that's always missing, it's insulat

 by dschlic1 ¦  Fri Sep 27, 2013 9:55 am ¦  Forum: SparkFun Product Questions ¦  Topic: if there's one thing that's always missing, it's insulation. ¦  Replies: 10 ¦  Views: 2530

You can also purchase insulated tubing. Checkout Digikey.