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12 Posts authored by: ralphjy Top Member
The new version of the Battery Chassis add-on for the Wio Terminal has added an On-Off button and a Texas Instrument's BQ27441 Battery Fuel Gauge https://wiki.seeedstudio.com/Wio-Terminal-Chassis-Battery(650mAh)/  .   The fuel gauge is a great feature that measures your battery's voltage to estimate its charge percentage and remaining capacity. The chip is also hooked up to a current-sensing resistor, which allows it to measure current and power.  The fuel gauge interfaces using ...
This is a continuation of my previous post Seeeduino XIAO Expansion board .  I'm going to use the RTC and microSD card to datalog time stamped temperature and humidity data from the DHT11 sensor to a file.   I'm going to use the RTC (PCF8563) and OLED (Adafruit_SSD1306) libraries from my previous post and add the standard Arduino SD library for the microSD card interface.  The SD library will pick up the default SD SPI (MOSI,MISO,CLK) pins from the Xiao variant.h file so we only ...
I posted earlier about a couple of SAMD21 mini modules that I'm using SAMD21 Mini Modules .   Last month Seeed Studio released an Expansion board for their XIAO module  https://www.seeedstudio.com/Seeeduino-XIAO-Expansion-board-p-4746.html  .   I've been using their Grove shield for the XIAO and it's handy for prototyping sensor programs and it also has battery management for portability https://www.seeedstudio.com/Grove-Shield-for-Seeeduino-XIAO-p-4621.html  .   ...
ralphjy

M5StickC Modules

Posted by ralphjy Top Member Dec 19, 2020
I've previously posted about small SAMD21 modules that I've found useful for small standalone projects - SAMD21 Mini Modules .   I also frequently have the need for small modules that have WiFi or Bluetooth connectivity.  I've tended to use ESP8266 boards for this purpose because they are reasonably inexpensive and easy to use.  I became interested in the M5Stick modules made by M5Stack after I saw one used by kk99 in the Photonics competition back in March - Simple light flicker ...
ralphjy

SAMD21 Mini Modules

Posted by ralphjy Top Member Nov 28, 2020
I recently came across same small footprint SAMD21 boards that I've found to be very useful for tinkering.   I've used the SAMD21 processors with a number of Arduino boards (Nano 33 IoT, MKR WAN 1300, MKR WiFi 1010) and I've been happy with their capability.  Quite a step up from the AVR parts.  What impressed me with these new boards is their small size and low cost.  Almost as cheap as buying the SAMD21 chip by itself.  I've been wanting a small low cost board tha ...
I've been taking a break from FPGA projects for the last couple of weeks.  We've had hazardous air quality due to the wildfires and even indoors with a HEPA filter I've found it difficult to concentrate.   I was browsing the Adafruit store looking for a board to try running TinyML and I stumbled upon a very inexpensive MCP2221A Breakout board ($6.50)  ADAFRUIT MCP2221A Breakout.   I know that shabaz  and others have used the MCP2221 as a USB to UART interface on PCBs t ...
I saw that this is going on through tomorrow in case anyone is interested.  I think I'll try to catch a couple of sessions tomorrow.   https://makerfaire.com/virtually-maker-faire-2020/schedule/     ...
It feels a bit strange to be working on my projects in the midst of this Covid-19 crisis but since the advice is social distancing - I guess it is an appropriate activity.  Hopefully isolation will slow the rate at which the virus is spreading so that a mitigation strategy can be implemented.   I've been working on my low power (5.5W) laser setup that I've described in previous blogs.  I've recently been doing some lightweight cutting of 2.5mm thick craft wood.  I've been us ...
I'm starting to get more experience with my laser and I'm trying to do some photo engraving on craft wood.  It's taking a lot of iterations to figure out the correct settings for transit speed and power for different materials and my workroom is starting to smell like a fireplace !   I had planned to do some active ventilation and/or air filtering when I started using the laser to cut wood as that generates a lot of smoke but I'm discovering that engraving is also problematic even ...
ralphjy

Laser Operating Sign

Posted by ralphjy Top Member Jan 18, 2020
I'm continuing to work on enhancing my laser setup.  One item on the list is a warning indicator that the laser is operating and that it is not safe to enter the room.  I plan to put it outside the door to my computer room (the access to the workroom with the laser is through the computer room), so one requirement is that the indicator should be remotely controlled via WiFi or Bluetooth.  I received an Adafruit 8266 Huzzah board in the latest Element14 goodie bag and that seemed l ...
ralphjy

Trying out my laser

Posted by ralphjy Top Member Jan 7, 2020
Santa brought me a laser for Christmas and I finally picked up the last piece of required safety equipment - a CO2 fire extinguisher.  So, I finally get to give it a try .   I have a SainSmart Genmitsu 3018 Pro CNC router that has provisions to swap the spindle for a laser module.  I am using a SainSmart 445nm 5.5W laser kit.  There are less expensive modules available, but I've found that it is difficult to get a good set of specifications on these units and decided it wa ...
ralphjy

Laser for Christmas

Posted by ralphjy Top Member Dec 26, 2019
Santa brought me a low power laser module for Christmas .  It is a 5.5W 445nm blue laser kit that is an accessory for my Genmitsu 3018 Pro CNC router  https://www.amazon.com/gp/product/B07RV8TG18/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1 .   I'm going to use it to do engraving and lightweight cutting.   I'm going to install LaserGRBL and play around with that before I actually try running the laser.  I'll post about my experiences next year as I get ...

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