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    Fanfan

    @Fanfan

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    Best posts made by Fanfan

    • RE: What did you build today (Pictures) ?

      Well, Design of an home made electronic kit for my 10yo daughter to teach her by example. on 74HC595 (shift reg), 9 leds, 4 push buttons, some wrapping wire, ... We managed to build it, it works, with some bad contacts, but it works, she enjoyed the thing and the time spent together. Here is the schema and the pictures. I strongly invite parents to build it with their children, easy and fun. !
      1_1557074595586_59399854_1643957105747897_3582083341400145920_n.jpg 0_1557074595584_59168532_1643956979081243_7862945518123483136_n.jpg 0_1557074649088_Capture d’écran_2019-05-05_18-43-50.png

      posted in General Discussion
      Fanfan
      Fanfan
    • RE: What did you build today (Pictures) ?

      My 3V Node (Atmega328P 1MHz), embedded NRF24L01+ with ceramic antenna, ATSHA256, AT25DF512, BME208, LED, Battery monitoring, ICSP, FTDI, Castelizable, Breadboardable. 0_1560175339322_IMG_20190610_155632461.jpg

      posted in General Discussion
      Fanfan
      Fanfan
    • RE: What did you build today (Pictures) ?

      Well,in my case, I mounted and tried to fix bugs in my very first design. This is supposed to be a castelizable Sensebender compatible node, embedding NRF24L01+, LED, Temp/Humi/Press sensor, Memory, crypto, with most of the IO exposed. The updated design is online, but still work in progress. 0_1555517692648_IMG_20190417_180651748.jpg
      project on OpenHardware

      posted in General Discussion
      Fanfan
      Fanfan
    • RE: πŸ’¬ MySensors Low-power Multi-function node on CR2032

      Hi @sundberg84 , Just in case, I redesigned the whole thing to fix some issues. This is still a work in progress, but it is very close to the final design.

      posted in OpenHardware.io
      Fanfan
      Fanfan
    • RE: Pan Tilt stepper motors

      @skywatch The issue I can see with steppers is that your camera might move when you poweroff the motors. As you said, when you poweroff them, they wont go back to center, but they also wont keep the position. If your camera is not perfectly balanced, it will "fall down". As well as your 3D printer : as long as you power the steppers, you can not move the axis, but as soon as you poweroff them (unlock) , you can move your axis.

      posted in General Discussion
      Fanfan
      Fanfan

    Latest posts made by Fanfan

    • RE: πŸ’¬ MySensors Low-power Multi-function node on CR2032

      @rvendrame sorry, I did not see your comment. Yes, it is VERY valuable. Thanks a lot

      posted in OpenHardware.io
      Fanfan
      Fanfan
    • RE: πŸ’¬ MySensors Low-power Multi-function node on CR2032

      @rvendrame Thanks a lot, I'm currently working on another project (electronic load). But I keep your idea in mind and will investigate when I'll continue this sensors project.

      posted in OpenHardware.io
      Fanfan
      Fanfan
    • RE: What did you build today (Pictures) ?

      @monte A little bit less, but not a lot. I still need to improve the PCB (better castelization tracks, remove diodes, ...) and this should be ready to be copied/used.

      posted in General Discussion
      Fanfan
      Fanfan
    • RE: πŸ’¬ MySensors Low-power Multi-function node on CR2032

      @pihome I did compile my own dualoptiboot for 1Mhz support. My board does not use any LDO (I am supposed to only plug 3V power supply, not more). The LED is not a "power LED" but a LED connected to A2 to be used (or not) by the sketch. I might have more current consumption because I use PA_MAX as transmission power. or because my sketch does not put BME280 in sleep mode (yet). I still need to rework on the schema and PCB to tune/optimize it (no need for the zener, the schottky and the FTDI connector), but the proof of concept for my very first real design works.

      posted in OpenHardware.io
      Fanfan
      Fanfan
    • RE: What did you build today (Pictures) ?

      My 3V Node (Atmega328P 1MHz), embedded NRF24L01+ with ceramic antenna, ATSHA256, AT25DF512, BME208, LED, Battery monitoring, ICSP, FTDI, Castelizable, Breadboardable. 0_1560175339322_IMG_20190610_155632461.jpg

      posted in General Discussion
      Fanfan
      Fanfan
    • RE: πŸ’¬ MySensors Low-power Multi-function node on CR2032

      @pihome A simple wakeup cycle lasts 1.2s at 20mA. In theory, I should have 10 hours of wakeup time.0_1560173350621_SDS00014.png

      posted in OpenHardware.io
      Fanfan
      Fanfan
    • RE: πŸ’¬ MySensors Low-power Multi-function node on CR2032

      @pihome I finally built it. There will still be some adjustments (routing for cutting castelized holes, diode protections removal, ...), but it works. Be careful, it is designed to have 2V-3.6V for power AND signals (double check your ICSP and FTDI programmers). The battery duration depends on your sketch (sleep time, transmission power, encryption ...), your battery (mAh), your sensors (I only have BME280 connected) and your gateway distance. I can tell you that it uses 13mA during transmissions at PA_MAX.

      posted in OpenHardware.io
      Fanfan
      Fanfan
    • RE: What did you build today (Pictures) ?

      Well, Design of an home made electronic kit for my 10yo daughter to teach her by example. on 74HC595 (shift reg), 9 leds, 4 push buttons, some wrapping wire, ... We managed to build it, it works, with some bad contacts, but it works, she enjoyed the thing and the time spent together. Here is the schema and the pictures. I strongly invite parents to build it with their children, easy and fun. !
      1_1557074595586_59399854_1643957105747897_3582083341400145920_n.jpg 0_1557074595584_59168532_1643956979081243_7862945518123483136_n.jpg 0_1557074649088_Capture d’écran_2019-05-05_18-43-50.png

      posted in General Discussion
      Fanfan
      Fanfan
    • RE: πŸ’¬ MySensors Low-power Multi-function node on CR2032

      @pihome I don't know yet, I'm still waiting for the PCB. I should receive them this week. From the mysensors site, 1Mhz vs 8Mhz does not make a huge difference. I'll try them both. What I can say is that 1Mhz as other constraints (I had to compile my own bootloader, then it is difficult to have reliable serial communication faster than 9600bauds, including for uploading sketches, meaning an update in the boards.txt file). Anyway, for sure, I'll build the board and make tests very soon. In the worst scenario, I may switch to CR123 batteries or LS14250.

      posted in OpenHardware.io
      Fanfan
      Fanfan
    • RE: Pan Tilt stepper motors

      @skywatch The issue I can see with steppers is that your camera might move when you poweroff the motors. As you said, when you poweroff them, they wont go back to center, but they also wont keep the position. If your camera is not perfectly balanced, it will "fall down". As well as your 3D printer : as long as you power the steppers, you can not move the axis, but as soon as you poweroff them (unlock) , you can move your axis.

      posted in General Discussion
      Fanfan
      Fanfan