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    ahhk

    @ahhk

    Hardware Contributor

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    Best posts made by ahhk

    • RE: Using mysensors for alarm build?

      Protecting your "home" starts first at the boundary. An alarm-system is the absolutly last option - the bad guy is already "in da house" then. Think about

      • fences
      • hedges
      • lockable windows (dont let the keys in the locks)
      • good neighborhood
      • motion-sensors and bright lights...
      • sticker on the windows (e.g. "house is protected")
      • a dog (?), too.
      • dont post on FB that you are on holiday

      If you do a lot of those things, the internal alarm system can be very simple: Just put some movable motion-sensors in the corridor and important rooms in the ground floor and connect them to a very loud siren outside, to the smoke-detectors inside and to all the lights, rolling shutter you have....just let the house go crazy :D. There is really no need for a "professional" alarm-system for a private (single-family) house in my opinion.
      greetings

      Andreas

      posted in Hardware
      ahhk
      ahhk
    • NRF24l01+ directly on Raspberry Pi ?

      Hi all,

      i searched and read a lot topics, but i am still not sure: Is it possible to run a NRF24L01+ directly connected to a Raspi and run a kind of "gateway" in software instead connecting an arduino to the Raspi? I would be happy to get rid of the arduino-ethernet-mqtt gateway...

      I think i found a link to sourcecode where someone ported the libs to pi, but no manual about it (howto install,....)..

      Maybe someone can give me a helping hand?
      Greetings

      Andreas

      posted in Controllers
      ahhk
      ahhk
    • My own board (50mm x 30mm)

      Hi all,

      i was never happy with the arduino pro mini and i dont like smd (too small for me). I was inspired by another design and so i decided to create my own board with "normal" components. i am not sure if everything is right, because this is my first selfmade pcb-design an my first project with eagle. So, i hope you can take a look at it and tell me, if something is wrong or what i can improve.

      This is the design:
      schema.png

      And this is the board.
      board.png

      Some background-info: I want to design an own board for every type of sensor i need. In detail:

      • 4x DS18B20 - powered with 3.3v-boost converter( seperate pcb)
      • I2C connector for LCD or Temp-Sensor (HTU21D)
      • Analog-Inputs for Moisture-Sensors
      • PIR-Board

      Here is only I2C-board. The other boards are nearly "identical" except pinouts...

      Every board has the same basic-features:

      • 2 LEDS (OK & Error)
      • Debug-Port (TX & GND)
      • Pinouts at same pcb-side (top)
        -Voltage Monitor included with solder jumper to chose input voltage. Reason: If the board is powered vi 3.3v booster, i need to monitor the raw-battery-voltage.

      The board is designed with eagle and seeedstudio design-rule. So i will order them when i have finished the design....

      What do you think about this?

      Greetings

      Andreas

      posted in My Project
      ahhk
      ahhk
    • RE: My own board (50mm x 30mm)

      Hi Gert,

      thx for your feedback. Lets make a small structure to discuss the things:

      Battery-monitoring
      I plan to you use the AREF as 3.3v Reference powered by the step-up-module. I think most of my sensors will have a step up. So this should be quite easy and accurate. In this case i solder a wire instead of R1 and "unsolder" R2....
      OR (if i really want) i can use the voltage divider on A0 instead (like mysensors.org says). I think with this schematics i have both possibilities... How does it work without resistors and internal vref (1.1v)? I only saw the version with 2 resistors on the mysensors page.
      By the way: I tested 3 step-up-modules:

      Pololu with NCP1402
      Sparkfun with NCP1402
      "China-Module"

      The China-Module is crap (+-240uA).
      Pololu draws +-100uA in sleep mode
      The Sparkfunboard only draws +-30uA in Sleep mode. I will go for that.

      Capacitors:
      There is a capacitor between VCC and GND. The capa between AVCC and GND is missing, you're right. Thx.
      I want to use AREF, so i cannot pull it to ground. Or what did you mean? Or am i missunderstanding something? I thougt AVCC is the supply voltage for the "REF"-function. And AREF is the reference-voltage....

      Programming
      In an updated version from last night, i moved the debugport to the topboard. I can upload new sketches via RX/TX...
      Do you know if it is possible to use the ISP when the NRF24l01+ is still connected to these pins?

      LED
      I dont want to have a regular LED-blink (power consumption). It shall only blink when working(transmitting).
      Green => All OK: Measures are ok, packet was sent
      RED => ERROR: Measurement fails or packet could not be sent...
      A DUOled would save some space, but no pins.

      Sensors
      I think i will have a max of 5 Sensors connected on one board , so there is no need to save pins whereever i can.
      The I2C port is like the sparkfun "standard" 😉 I have a lot of HTU21D-BOBs laying around. They work like a charm

      After i gave my child something to eat, i update and upload the schematics...give me some time 😉

      posted in My Project
      ahhk
      ahhk
    • RE: My own board (50mm x 30mm)

      Next variant. Less flexible, but flexible enough. Boardsize now 50x30mm
      It's only one pcb now and you can connect

      • 5x sensors (digital or analog)
      • 1x I2C and 3x sensors (digital or analog)

      Step-up can be soldered to the bottom.

      What do you think?
      base2sch.png base2.png

      posted in My Project
      ahhk
      ahhk
    • RE: My own board (50mm x 30mm)

      Hi,

      sure i will share the brd-file and schemativ. No problem. But let me first build one working sensor. I think i will order the pcbs this weekend, because this looks good too =>
      IMG_20150925_130732.jpg IMG_20150925_130712.jpg

      posted in My Project
      ahhk
      ahhk

    Latest posts made by ahhk

    • RE: Having issues with 2AAA battery project and AVRDUDE

      I thougt uploading via ISP-programmer deletes the bootloader?

      posted in Hardware
      ahhk
      ahhk
    • RE: Having issues with 2AAA battery project and AVRDUDE

      but you can run on a lower Vmin value....
      The other thread doesnt help - there was no solution for the serial-problem at 1mhz...
      Greetings

      posted in Hardware
      ahhk
      ahhk
    • RE: Having issues with 2AAA battery project and AVRDUDE

      Hi,

      this is **very **interesenting for me. could you write a small tutorial when you solved it? i failed until today to use arduino ide with 328p@4mhz(or lower) with arduino bootloader. i read something about compiling a new bootloader - but this is too much for me to go and i didnt find a compiled bootloader for 1 or 4mhz to download 😞

      greetings

      andreas

      posted in Hardware
      ahhk
      ahhk
    • RE: What wire to use when soldering semi-permanent sensors?

      Hi,

      why dont you design your own pcbs? Its quite easy...
      Greetings

      Andreas

      posted in General Discussion
      ahhk
      ahhk
    • RE: My own board (50mm x 30mm)

      Maybe its better to open a new thread for this question? 😉

      posted in My Project
      ahhk
      ahhk
    • RE: Soil Tensiometer Sensor Network

      read the description:

      "but it's always best to avoid long-term (over 1 hour at a time) submersion, if you need something that can be submerged for over an hour you may want to find a different sensor. "

      posted in My Project
      ahhk
      ahhk
    • RE: Speech recognition

      check the voice-recognition in Openhab for example. it is cheaper and a better solution then realizing this in hardware...

      posted in Hardware
      ahhk
      ahhk
    • RE: My own board (50mm x 30mm)

      ok, great 🙂 Lets how they look ready....

      posted in My Project
      ahhk
      ahhk
    • RE: Possible for novice to create PCB?

      Eagle is much easier than it looks. I started a few ago with my first pcb. After looking one or two tutorials, i got my first successful schema. Just give it a try. One evening and a beer or glass of wine is enough to learn eagle.

      posted in KiCad
      ahhk
      ahhk
    • RE: My own board (50mm x 30mm)

      Update: PCBs are shipped via express... 👯

      posted in My Project
      ahhk
      ahhk