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    gohan

    @gohan

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    Best posts made by gohan

    • Portable RFM69 Signal Scanner

      Just wanted to share my tonight creation
      0_1508188047036_upload-ad843227-d291-4f19-874f-5437afd020c8
      It shows Send and Receive RSSI and vcc (that btw is measured via voltage divider and is spot on with my multimeter)

      posted in My Project
      gohan
      gohan
    • RE: nRF5 action!

      I'd say to make something with pogo pins if you really need it once

      posted in My Project
      gohan
      gohan
    • RE: BlackBox: binary, lightweight communication protocol handler source code generator.

      I am not a super skilled programmer, so may I ask how would this fit with MySensors?

      posted in My Project
      gohan
      gohan
    • RE: Troubleshooting communication [solved]

      In fact @sundberg84 usually advices to have the antenna sticking out of the pcb underneath as the ground planes tend to what they are made for: shielding EM. Also trace antenna orientation plays a role too

      posted in Troubleshooting
      gohan
      gohan
    • RE: Will MySensors work for me?

      Mysensors can handle both rfm69 encryption and also signing

      posted in General Discussion
      gohan
      gohan
    • RE: Is there a way to check presence of a MySensors network, and proceed without if not found ?

      #define MY_TRANSPORT_WAIT_READY_MS 5000

      posted in Development
      gohan
      gohan
    • Supercap Solar Powered Mysensors nodes as cheap as possible

      I am currently testing a couple of concepts to power an outdoor node for temperature and humidity with readily available stuff:

      • 2.7v: using this supercap + this module, just hook up any 6v solar panel to Vin and the supercap on the Vout with a diode in between that will block any reverse current and most important will drop voltage by ~0.7v to make it suitable for the supercap. Then I connected a standard EasyPCB from @sundberg84 with standard voltage divider, SHT31 sensor and this booster

      • 5.5V: using 5 of theese connected directly to 6v solar panel with a diode in between for the above reasons, then connected them to the Vin of the buck-boost module and node connected to the Vout. This time I had to do some changes to EasyPcb: I shorted REG jumper, shorted Vin and Vout on the regulator footprint just above the Arduino and made a different voltage divider on the prototype area with R1 1.22M and R2 300K in order to read a maximum of 5.57v

      ((1e6+220e3+300e3)/300e3)*1.1 = Vmax = 5.57 Volts
      5.57/1023 = Volts per bit = 0.005448028
      

      5.5V inside
      0_1508077207132_upload-5fd5955c-e4c6-497e-9c30-92e3ec5e43aa

      Finished: the solar panel has been glued with transparent silicon for the entire perimeter
      0_1508078961144_upload-8ccf909d-3b1c-454e-9b72-69401a018193

      posted in My Project
      gohan
      gohan
    • RFM69 antennas comparison

      I wanted to share my finding following my RFM69 signal scanner I previously built. I used 2 types of antennas:

      • Coil Spring from alixpress

      • Hand made like the one mentioned by @sundberg84 in [his project](https://www.openhardware.io/view/389/EasyNewbie-PCB-RFM69-HWW-edition-for-MySensors

      I let them run several hours reporting TX power since the new rfm69 driver adjusts power output to the default target RSSI of -80db
      0_1508679176407_upload-2f1bd39a-66be-4992-b5f2-12d14acbc24e

      The test was done on the same spot (my desk) and the gw about 5 meters away (1 floor difference, and a couple of walls in between; gw running the coil spring antenna).
      I am currently testing the SMA antennas and results are better than the hand made antenna with a TX power of 35/40% instead of 55/60%. My guess is the hand made antenna had to be squeezed inside the box getting a wrong orientation, while the SMA one is outside and it can stay perfectly vertical.

      0_1511186543222_upload-8de8638c-a16c-4bbc-8a5b-0e841224a304

      posted in Hardware
      gohan
      gohan
    • RE: 💬 Building a Raspberry Pi Gateway

      As soon as you do the changes in myconfig.h before the MAKE, you are fine

      posted in Announcements
      gohan
      gohan
    • MQTT IR Remote

      0_1511134309103_IMG_20171116_224416.jpg
      It is actually very simple project: I followed this guide -> http://www.sysrun.io/2017/02/22/use-a-esp8266-to-control-your-ac-via-mqtt/ and used a pn2222a to boost the IR Led like I have seen in this picture
      0_1511134195290_upload-cfe40b54-675b-44f9-b0f6-8754d226e110
      For the control user interface I used MQTT Dash: the app is very simple, just add the appropriate dashboard element to each of the topics.
      0_1511134535457_Screenshot_20171116-224308.png
      For MQTT service I used Cloud MQTT and it works perfectly.
      This project started as a request from my father to be able to control his Daikin heat pump / AC and since he is not a very computer enthusiast, I had to find something really simple and stand alone without any other additional controllers. The user interface had to be very simple so the only 4 main functions were used, since he was requiring just to be able to switch it on remotely without any time schedule.
      Yesterday I did some tests and the communication is really instantaneous. I was a little disappointed as I was able to send commands from the other side of the room only with led pointing a the AC unit (from below the unit it was not a problem at all). Next step would be to open the unit and try to find a 3.3/5V source to power the Wemos and put it inside.

      Of course the IR library supports other brands and I think it can be converted to mysensors use by replacing the MQTT communication with the usual mysensors functions.

      posted in My Project
      gohan
      gohan

    Latest posts made by gohan

    • RE: Raspberry Pi gateway and controller in one

      @sebex unless you have hass.io you should be able to SSH into the rpi

      posted in Home Assistant
      gohan
      gohan
    • RE: 💬 Gas Sensor

      I'd say the ones with benzene

      posted in Announcements
      gohan
      gohan
    • RE: 💬 In Wall AC/DC Pcb (with Relay) for MySensors (SMD)

      Do you really need a compact device?

      posted in OpenHardware.io
      gohan
      gohan
    • RE: 💬 Connecting the Radio

      @dmonty did you use the shielded radio module?

      posted in Announcements
      gohan
      gohan
    • RE: Watchdog not watchdogging?

      Does it work with a shorter time than 8S?

      posted in Development
      gohan
      gohan
    • RE: 💬 Door, Window and Push-button Sensor

      @pepson then it is going to be quite difficult for you to work on DIY electronics projects if you don't how to program.

      posted in Announcements
      gohan
      gohan
    • RE: Multimeter recommendation?

      It is a common issue I see in these small cheap meters. There is always the openhardware current meter for what you are suggesting

      posted in General Discussion
      gohan
      gohan
    • RE: Multimeter recommendation?

      Aneng an8009 or similar is still a really good buy, 9999 counts is not something you get usually from cheap meters

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

      @boozz serious water leak heppened once in 40 years

      posted in General Discussion
      gohan
      gohan
    • Daikin heatpump controller, no IR

      Hi
      I have been searching if this cable can be used like the cn105 for Mitsubishi devices, but so far I only found libraries for daikin that use IR. Is there really no other way than IR?

      0_1561909620522_IMG_20190629_114204873.jpg

      posted in Development
      gohan
      gohan