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Ralph Yamamoto's Blog

20 posts
I was inspired by jomoenginer and ordered a Jetson Nano Developer Kit directly from Nvidia.  I received it a few days ago but just now had a chance to set it up.   I noticed in YouTube videos that everyone uses the 4A power supply with the barrel jack.  I guess I should have checked earlier.  The default standard power mode is 10W.   It is supposed to be marginal with the 2A micro USB jack. There is a 5W power mode that you can select that reduces the CPU and GPU ...
Since this power supply has been around since 2015, there is a lot of information about it on the Internet.  I thought some on the info that I've come across on the internals of the power supply might be of interest to others.  I don't think this info is appropriate for a road test so I'm posting it on my personal blog not the road test blog.   A couple of caveats about this info: I would not suggest that anyone open or modify their power supply as that will definitely invalidat ...
ralphjy

Phones for the Elderly

Posted by ralphjy Apr 16, 2019
I'm writing this out of frustration of trying to find a simple phone for my 96 year old mother.  Going through the aging experience with my parents, other relatives, and parents of friends, has made me realize that appliances that are designed today are much too complicated people with diminishing capability to operate.  Let me use the phone as an example.   My mother lives in Hawaii and I live in Oregon (having moved 40+ years ago for an engineering job).  My mother was liv ...
I've wanted to try using a laser cutter but haven't had the opportunity until today.  There is a campus of Portland Community College (PCC) just up the hill from me.  Spring term was the first time that they've offered Maker community education courses (3D printing and laser cutting).  I was fortunate to get into the first laser cutting class.  They have 3 laser cutters from Universal Laser Systems in their MakerLab.   They have a 60 Watt model with a work area of 3 ...
I received a notification that NXP is doing a Technology Training Day in Seattle (Bellevue), Washington on May 7. https://getregisterednow.com/NXP/Event/Register/Register.asp?e=NXPTechDaySeattle2019&r=e&elq_mid=7369&elq_cid=2769005   Has anyone attended one of these?  And anyone going to this one?   I'm down in Portland, so I'd probably need to drive up the day before and stay overnight.  I'm still debating whether to register or not.  I'm sure the worksho ...
I was very excited to try out my Oboo Smart Clock. I really wanted to demonstrate some of the features to my wife who wondered why I would back a clock on Kickstarter.  Unfortunately, the out-of-the-box experience was not very good.  The instructions included were minimal, which would have been fine if everything had functioned correctly.  They have a browser based app (not a downloadable mobile app as the instructions imply).  The app is not well designed and because the scr ...
Back in November of 2017 I decided to back a smart clock project on Kickstarter.  It was being designed by Onion using their Omega 2 IoT computer.  I bought it as an early Christmas present to myself with an estimated delivery of June 2018.  I just received it via UPS this afternoon - only 9 months late - I had almost given up on it......   Here is a link to the Kickstarter campaign: https://www.kickstarter.com/projects/onion/oboo-smart-clock-wifi-connected-and-gesture-contr ...
ralphjy

Giving Snips a Try

Posted by ralphjy Mar 16, 2019
After seeing the blog post What makes an office smart?  I decided that I should give Snips a try.  I have multiple Echo devices in my house and I have also tried Google (AIY Voice kit) but there are some circumstances where it is beneficial to keep voice interaction/control on the local network.  I currently use Alexa for voice control of a pan/tilt outdoor security IPcamera.  I'd like to retain this capability even if the Internet connection is down (I record on a local NVR ...
The project that I'm working on with the Rapid IoT requires reading information from an external NFC tag.  The Rapid IoT has the capability of reading and writing an internal NT3H2211 NFC tag, but it does not have the capability to read or write an external tag.  The simplest way to implement that is to use a Mikroelektronika Click card, but that requires adding a Click interface for the Rapid IoT.  Mikroelektronica has 3 Click expansion units in the Hexiwear product line that als ...
The MCUXpresso IDE is an Eclipse based development environment that offers more advanced editing, compiling and debugging of applications for the Rapid IoT device. In this blog post I'm going to cover generating an example program using MCUXpresso.   You need to download and install two components: 1) MCUExpresso IDE  http://www.nxp.com/MCUXpresso 2) Rapid IoT SDK  http://www.nxp.com/rapid-iot   The Rapid IoT SDK actually contains two SDKs, one for each processor in the ...
In December of 2017 I had a solar system installed at my house.  This is my first experience using solar technology.  I thought that since I've had the system running for a full year that it useful to review how well it has performed relative to my expectations.  I had previously posted the system description as part of the Heat is On Solar Project contest on Project14: https://www.element14.com/community/community/project14/solarpowerdevices/blog/2018/07/31/solar-spec-intro,  ...
NXP provides two different IDEs to develop programs for the Rapid IoT device.  The first is Rapid IoT Studio which is a graphically oriented web based Atmosphere drag-and-drop IDE.  The second is the MCUXpresso IDE which is an Eclipse based IDE for NXP's microcontrollers based on the Arm Cortex-M cores.  The second option requires that you download and install the free MCUXpresso application.  You also need to download and install the SDKs associated with the MK64F12 and MKW4 ...
ralphjy

NXP Rapid IoT - OOB Demo

Posted by ralphjy Dec 23, 2018
I've used the OOB (Out-of-Box) Demo to familiarize myself with the Rapid IoT kit and I thought that I'd describe its functionality and provide a short critique before I move on to creating my own programs.   The OOB Demo allows you to configure the settings on the device and to  try out all of the sensors.  It also allows you to connect to either an iOS or Android phone/tablet using apps that are provided.  And you can also connect to a Rapid IoT Dashboard in the cloud by us ...
I didn't sign up for the roadtest, but I recently got one of these kits so I thought that I'd see how my experience compares to that of the roadtesters.   The Rapid IoT module packs a large array of sensors into a small package (2" x 2" x 1/2").  It includes wireless interfaces (BLE and Thread) and a small LiPo battery.   The kit includes the module and a short USB cable for power and programming and a Quick Start Guide.   The module comes pre-programmed with an Out-Of-B ...
I am going to start a project soon where I want to use RFID tags to enable user authentication and individual profiles for a home automation remote controller.  I haven't worked with RFID tags before, even though they are fairly ubiquitous at this point.  I imagine this is old hat to most folks, but I thought I'd share my learning.   I purchased an RC522 RFID Reader/Writer module and a set of RFID tags on Amazon.  The RC522 chip itself offers multiple interfaces (SPI, I2C, S ...